Model 2820A-4003 & 2820A-4003E Chamber Communicator … · 2015. 11. 17. · Model 2460SM-28 ....

Instruction Manual For

Amron International Diving Supply, Inc.

Model 2820A-4003 & 2820A-4003E Chamber Communicator

S/N

This manual and the information contained herein is provided for use as an operation and maintenance guide. No license or rights to manufacture, reproduce, or sell either the manual or articles described herein are given. Amron International Diving Supply, Inc. reserves the right to

change specifications without notice.

Amron International Diving Supply, Inc. 1380 Aspen Way

Vista, California 92081 U.S.A Phone:(760) 208-6500

Fax (760) 599-3857 Email: [email protected] Website: www.amronintl.com

Copyright © 2009, Amron International, Inc.

Revised August 2010

mailto:[email protected]

TABLE OF CONTENTS

CONTENTS SECTION

Specifications 1

General Information 2

Description ....................................................................................................................2.1 Description 2820A-4003E .............................................................................................2.2 Drawing, Front Panel Controls Model 2820A-4003.......................................................2.3 Drawing, Front Panel Controls Model 2820A-4003E ....................................................2.4

Options 3

Warranty and Service Policy 4

Limited Warranty ...........................................................................................................4.1 Service Policy................................................................................................................4.2

Controls and Connections 5

General .........................................................................................................................5.1 Operator Controls..........................................................................................................5.2 Operator Connections...................................................................................................5.3 Drawing, Operator Connections - P.T.T. Microphone ...................................................5.4 Drawing, Operator Connections - Headset ...................................................................5.5 Drawing, Chamber Connections ...................................................................................5.6

Installation & Operation 6

Installation.....................................................................................................................6.1 Push to Talk Microphone Connections .........................................................................6.2 Headset Connections....................................................................................................6.3 Initial Set Up..................................................................................................................6.4 Headset Operation ........................................................................................................6.5 Description of Operator Controls...................................................................................6.6

Theory of Operation 7

Amplifier Card 2832-202 ...............................................................................................7.1 Battery Charger Card, 2324-202...................................................................................7.2 Entertainment Amplifier Circuit......................................................................................7.3 Functional Block Diagram - Model 2820A-4003............................................................7.4

I

TABLE OF CONTENTS

II

Maintenance 8

General .........................................................................................................................8.1 Trouble Shooting...........................................................................................................8.2 Problems and their Possible Causes ............................................................................8.3 Adjustments ..................................................................................................................8.4

Drawings 9

General .........................................................................................................................9.1 Schematic 2820A-4003.................................................................................................9.2 Schematic 2820A-4003E ..............................................................................................9.3 Parts Identifier 2832-202...............................................................................................9.4 Parts Identifier 2324-202...............................................................................................9.5 Parts Identifier - Front Panel 2820A-4003.....................................................................9.6 Parts Identifier - Front Panel 2820A-4003E ..................................................................9.7 Parts Identifier - Rear Chassis 2820A-4003 & 2820A-4003E .......................................9.8 Mounting Detail 2820A-4003 & 2820A-4003E ............................................................. 9.9

Parts List 10

General .......................................................................................................................10.1 Model 2820A-4003 Chamber Communicator..............................................................10.2 Model 2820A-4003E Chamber Communicator w/ Entertainment ...............................10.3 2820A-4003-400M Front Panel Assembly ..................................................................10.4 2820A-4003E-400M Front Panel Assembly, Entertainment .......................................10.5 2820A-4003-500C Chassis Assembly ........................................................................10.6 2820A-4003-FS Field Spares Kit, Model 2820A-4003 ............................................... 10.7 Optional Spares ..........................................................................................................10.8

SPECIFICATIONS

SPECIFICATIONS 1.1

Electrical

Input Impedance (each Input) ........................................................................... 250 Ohms Frequency Response................................................................................ 300 - 10000 Hz Common Mode Rejection..........................................................................40 dB Minimum Current Drain Maximum Full Volume...............................................................................................3 ADC Minimum Quiescent ...........................................................................................0.250 ADC Output Impedance...................................................................................................4 Ohm DC Power Requirements Voltage ...........................................................12 VDC Nominal (For Operation on External) - Range.............................. 9 Volts Min. - 18 Volts Maximum Battery Current............................................................................................ 3 Amps Peak Sensitivity (input)...............................................................................................16 mVRMS Output Power (Peak @ 4 Ohm Load, 12 Vdc) .......................................... 20 Watts Audio Battery Backup Life ............................................................................................. 20 Hours Operating Voltage .................................................................. 115/230 Volts AC 50/60 Hz

Electrical Model 2820-4003E, Entertainment Option Output Power ........................................................................................................ 6 Watts Sensitivity (input)...................................................................................................... 1 Volt

Mechanical Panel ..........................................................................................................Stainless Steel Enclosure .................................................................................Black Anodized Aluminum

Dimensions Length ................................................................................................10.125 in. (25.7 cm) Depth.......................................................................................................7.5 in. (19.1 cm) Height......................................................................................................7.5 in. (19.1 cm) Weight With Batteries.................................................................................15 lbs. (6.8 kg)

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GENERAL INFORMATION

DESCRIPTION 2.1

The AMRON INTERNATIONAL Inc., AMCOM II Model 2820A-4003 and 2820A-4003E are decompression chamber communication systems, providing two-way communications between the chamber operator and the occupants of the chamber. The Model 2820A-4003 & 2820A-4003E are used in conjunction with a chamber talk back speaker i.e., the Amron Model 3113, 3114, 3115, 3125 or 3126. The Model 2820A-4003E is exactly the same as the 2820A-4003, but also includes a separate entertainment channel, amplifier. This is used with the Model 3130 entertainment speaker to provide music (audio) to the chamber occupants. All references to the Model 2820A-4003 apply as well to the 2820A-4003E. The AMCOM II chamber communication systems are full feature hard wire, two lock communicator systems. The AMCOM II has independent volume controls (operator, inner lock, & outer lock.), as well as separate on/off controls for each lock. Both models are supplied with hand-held microphones, for use by the operator. The 2820A-4003 has the capability of two modes of operation, a simple intercom type operation, or telephone type operation using headsets both inside and outside the chamber. The two modes are known as, 2-wire and/or full duplex (4-wire) communications. The two-wire mode of operation is a simplex type system. The operator monitors the chamber conversations via a talkback speaker mounted on the front panel of the unit. The operator can talk to the occupants by using the hand held microphone, or by using the Push-To-Talk (PTT) switch and speaking into the front panel talk back speaker. Inside the chamber is a talk back speaker, which picks up the sounds within the chamber. When the operator speaks to the chamber, the 2820A-4003 connects the chamber internal speaker to the amplifier output and the operator voice is broadcast to the chamber occupants. All switching operations take place outside the chamber. The full duplex mode of operation requires the use of two headsets, one for the operator and one for use inside the chamber. Conversations are full duplex, and occur as with a telephone, and do not require the use of the PTT switch. Additional headsets can be used both inside and outside the chamber, allowing several parties to communicate. The system also permits mixed operation, however any mixed operation does require the use of the PTT switch. The PTT switch also provides an over-ride function, operator conversation over-rides occupant. Full duplex is a communications system designed from the “ground-up” to take advantage of the current “state of the art” in semiconductor technology and provide superior communications. The unit operates from 115/230 VAC 50/60 Hz and has internal rechargeable battery back-up. It also can be operated from an external 12 VDC power source.

2

GENERAL INFORMATION

DESCRIPTION, 2820A-4003E 2.2

The model 2820A-4003E has a separate amplifier to provide entertainment audio for use in the chamber. The entertainment audio output is connected to a separate speaker within the chamber, i.e., the Amron model 3130. Stereo input connections (RCA jacks) are provided on the back panel for connection to the desired audio entertainment source. The audio source can be audio (music) from any source i.e., AM, FM, tape recorder, CD player, TV or other source as desired. The 2820A-4003E has a separate ON/OFF, volume control for the entertainment channel, also the entertainment audio is interrupted whenever the hand held microphone or the push-to-talk switch is used. This automatically cuts off entertainment audio to the chamber entertainment speaker when voice communications are in process, (operator to chamber, PTT).

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GENERAL INFORMATION

FRONT PANEL CONTROLS MODEL 2820A-4003 2.3

4

GENERAL INFORMATION

FRONT PANEL CONTROLS MODEL 2820A-4003E 2.4

5

OPTIONS

OPTIONS 3.1

Model 2821-28 Remote Push-To-Talk (2-Wire Operation) AMRON headset extension with push-to-talk belt module, jacks for headset, and 25 cable. (Use with Model 2460-28 or Model 2401-28 headset). Model 2822-28 Remote Walk-and-Talk (4-Wire Operation) Amron full duplex (4-wire) headset extension, belt module with 25 feet cable. (Use with Model 2460-28 headset) Model 2460-28 Headset Headset with boom microphone and color coded dual banana plugs to mate color coded inputs on Amron communicators and accessory items. Model 2460SM-28 Single earphone with same functions as 2460-28. Model 3113 Chamber Comm. Box Decompression chamber communication box. Folded acoustic horn talk-back speaker, 15 watt, headset jack, MS input connector. Model 3114 Chamber Comm. Box Decompression chamber communication box. Three inch talk-back speaker, mylar impregnated cloth cone, three foot SJO cord. Model 3115 Chamber Comm Box Decompression chamber communication box. Same as Model 3113, also has a speaker ON/OFF switch. Model 3125 Chamber Combo Box Decompression chamber combination communication/junction box, designed for inner lock functions. Mounts direct to chamber penetrator (eliminating chamber wiring), includes; penetrator adapter bushing, chamber talk-back speaker, speaker ON/OFF switch, headset jack, temperature probe, sound powered phone & bracket, and power connection circuit for chamber internal conditioning system & chamber scrubber. Model 3126 Chamber Combo Box Decompression chamber combination communication box, outer-lock design. Mounts direct to chamber penetrator (eliminating chamber wiring), includes penetrator adapter bushing, chamber talk-back speaker, speaker ON/OFF switch, headset jack, sound powered phone & bracket. Model 3127 Chamber Junction Box Outside junction box, for use with the Model 3125 & 3126. Includes 12 pin electrical penetrator, mounting adapter, and MS connector to mate with Model 3128 wiring harness.

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OPTIONS

7

OPTIONS (Continued) 3.1

Model 3128 Chamber Wiring Harness (Custom) Decompression chamber wiring harness, one end connects directly to 2820-4003, other end connects to model 3127 junction box. Pre wired, tested and customized to your chamber size requirements. Model 3130 Chamber Entertainment Speaker Decompression chamber entertainment speaker. Speaker is 15 watt, 8 inch, music quality, mylar impregnated cloth cone. Includes 6 each headset jacks, for mini phone plugs. Model 2460-31R Headset Headset with boom microphone, for use in decompression chambers, has 4 pin connector to plug directly into chamber comm boxes. Model 2460-31R-25 Headset Extension Integrated headset extension for Model 2460-31R headset when used with chamber communications boxes. Flexible 25 foot cord, with 4 pin audio connector.

WARRANTY

LIMITED WARRANTY 4.1

AMRON INTERNATIONAL DIVING SUPPLY, INC. warrants that it’s products are free from defects in material and workmanship under normal use and service, as described in AMRON INTERNATIONAL DIVING SUPPLY, Inc.. Literature covering this product, for a period of 90 days from date of shipment. Amron’s obligation under this warranty is limited to the repair of or replacement, at AMRON’S option, of defective material. This warranty shall not cover defects which are the result of misuse, negligence, accident, repair or alterations.

SERVICE POLICY 4.2

AMRON INTERNATIONAL encourages owners of equipment to call (760) 208-6500 for assistance if problems are encountered. Every effort will be made to assist in solving your problem. Equipment which must be returned to the factory for repairs should be safely packaged, insured, and shipped prepaid to:

Amron International, Inc. 1380 Aspen way Vista, CA 92081

Be sure to include the following information:

Your Name

Your Company Shipping Address

Phone Number Contact Name

A short description of the problem is most helpful. Valid in warranty repairs will be made at no charge. Out of warranty repairs will be handled in the same fashion, except you will be advised of the repair charges before any work is done.

8

CONTROLS & CONNECTIONS

GENERAL 5.1

Before using the AMCOM II chamber communications system, you should familiarize yourself with its operating controls and connections. Improper use of controls and connections may deprive the user of the full benefit of this communication system. Reference: Figure 1 & 2 Front Panel model 2820A-4003 and 2820A-4003E.

OPERATOR CONTROLS 5.2

Power Switch Turns unit on/off, applies power to the unit from internal rechargeable batteries or from external source. Speaker Switch Turns Speaker ON/OFF. PANEL MICROHPONE Condenser microphone to pickup tender voice, it operates when Speaker Switch is ON and PTT Switch is depressed. P.T.T. Switch Push to Talk Switch enables operator to speak to the occupants of the chamber, used in the 2-wire mode. Push to talk is not required when operating in full duplex (4-wire) mode. In the full duplex mode this switch allows the operator to interrupt all locks with a priority message. Volume Controls Controls the volume for the operator, adjusts the volume level of the audio originating in the inner and outer locks.

OPERATOR CONNECTIONS 5.3

Tape Recorder (output) Is an RCA jack connection for tape recording conversations, output is approx 300 mVRMS. Microphone (input) Microphone input is a dual banana jack connection for the headset microphone. Jacks are color coded red. Headset (input/output) Headset is a dual banana jack connection for headset earphones, external remote speaker, or hand held push to talk microphone. In 2-wire mode of operation both headset microphone and earphones are plugged into this jack, conversation (up-link & down-link) are switched automatically when push to talk switch is actuated. In the full duplex mode this jack is listen only, both sides of the conversations are heard (to and from the chamber). Jacks are color coded black.

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OPERATOR CONNECTIONS (Continued) 5.3

P.T.T. (input) Push To Talk (input) Is a dual banana jack connection for remote keying of push to talk single contact closure, close to talk to the chamber, open to listen to the chamber. Banana jacks are color coded yellow. Battery Condition

Indicator tells whether the unit is on or off and provides information regarding the condition of the backup battery power. If the unit is being operated from AC power the light will be on steady. If the unit is operating from the internal batteries (AC power is off or if the unit is not plugged in), the indicator will display the condition of the battery charge, as follows;

1. A steady green light indicates batteries are of sufficient voltage to operate the unit. 2. Blinking green light indicates batteries are approaching a low level, approximately 3 hour

operating time left, from the time the light began to blink. 3. A steady red light indicates battery voltage below reliable operating level. First function to

fail will be communications to the chamber, (PTT) in the 2-wire mode of operation

Note: Unit must be on for 5 minutes before display can be considered accurate. Batteries tend to recover when turned off, this condition is known as surface charge. Due to the surface charge the voltage will be high when first turned on and will drop rather quickly to its actual level.

Lock Controls

1. Volume - Inner Lock Controls volume level of operator’s voice as heard by the inner lock. In the full duplex mode of operation it sets the lock’s side-tone volume (headset).

2. Volume - Outer Lock, Controls volume level of operator’s voice as heard by the

inner lock. In the full duplex mode of operation it sets the lock’s side tone volume (headset).

3. On/Off- Inner Lock - Disconnects inner lock, disables all communication with the

inner lock. 4. On/Off - Outer lock - Disconnects outer lock, disables all communication with the

outer lock.

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OPERATOR CONNECTIONS (Continued) 5.3

Entertainment Controls, Model 2820A-4003E Only Volume - Adjusts the volume level of the entertainment audio within the chamber and is located with the inner lock group of controls. Rear Panel Connections MS Connector - Electrical connections to chamber, inner and outer lock audio signals, entertainment channel output (2820A-4003E only) and power connections for operation from a 12 VDC source. Entertainment input jacks - Model 2820A-4003E only, two each RCA type jacks for audio input (two jacks are provided for stereo input, signal is mixed internally for a monaural output). AC Inlet Jack – Standard jack for AC power cord, supplied with units.

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2820A-4003 PUSH TO TALK MICROPHONE 5.4

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2820A-4003 HEADSET CONNECTION 5.5

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SCHEMATIC CONNECTION MODEL 2820A-4003 TO CHAMBER 5.6

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INSTALLATION & OPERATION

INSTALLATION 6.1

Chamber communication wiring - see examples outlined on schematic 2820A-4003 and the 3128 if purchased. Connect the lock speakers to the cabling harness. The lock speaker is normally wired to the microphone lines (J1 Pins A & B or E & F) Turn power off, AC power unplugged, connect chamber wiring cable connector to J-1. Plug 2820A-4003 into AC power source, 100/240 VAC 50/60 Hz. Connect audio source to RCA jacks (model 2820A-4003E only), if stereo connect left channel to one jack and right channel to other jack, if monaural source connect to either jack. Unit is now ready for test, functionally test unit as described, par 6.4. Install unit into panel cutout, and fasten with four brass thumbscrews provided.

PUSH TO TALK MICROPHONE CONNECTIONS 6.2

The push to talk microphone has two dual banana plugs. Insert the yellow banana plug into the yellow jacks, (push to talk jacks on front of 2820A-4003). Insert the black dual banana plug into the black jacks, (jacks labeled headset on the front of the 2820A-4003). A microphone holder is provided on the front panel to facilitate storage of the microphone when not being used.

HEADSET CONNECTIONS 6.3

Connect headset by inserting the red and black banana plugs into the red and black jacks on the front of the 2820A-4003 panels, note headset is an optional item.

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INITIAL SET UP 6.4

Check to see that the inner lock, outer lock, and speaker switch are all on. Set volume controls to low. Confirm that AC power is available; AC power LED indicator should be on. Turn power ON. Check to see that battery condition indicator LED is on. Have someone in the inner lock talk, and adjust operator volume control to a comfortable listening level. Operator should then give a short count, use hand held microphone. Operation of the unit with the microphone is simple and straightforward. Hold the microphone about 1 inch away from mouth, depress the push to talk lever on the side of the microphone and speak clearly and directly into the microphone. Release the push to talk lever when finished. Someone in the inner lock should determine what is a comfortable listening level having the operator adjust as needed, (adjust the inner lock volume control). Adjustment of volume controls, volume levels should be sufficient to ensure good communications. If excessive feedback occurs see SECTION 8.2 for instructions on adjusting the operator volume level to the chamber. This adjustment should be made to optimize the volume levels during initial installation. Confirm that the inner lock on/off switch works properly. When off, all communication to and from inner lock stops.

HEADSET OPERATION 6.5

Test headset operation (if desired). Note with operator and inner lock on headset, you do not need to use the push to talk switch. Depressing the push to talk switch when using headsets, cuts off the locks allowing the operator to have priority. This feature provides the operator the ability to interrupt a conversation and convey an important message. When communicating with a headset inside the chamber it is not necessary to use the push to talk switch. All headsets (i. e. Operator, inner lock, outer lock) can talk to each other without using the push to talk function. This permits a three party conversation similar to that of a telephone. You may find it necessary to turn off the 2820A-4003 speaker while the operator is using a headset. A feedback condition can occur while using a headset (headset microphone is receiving the sound from the speaker causing the feedback) it will depend upon two factors, the volume level and the distance between the headset and the speaker. Repeat the above procedures for the outer lock.

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17

DESCRIPTION OF OPERATOR CONTROLS 6.6

Power On - Off - this switch controls power to the unit. This switch does not disable the battery charging circuit. The battery condition indicator should come on when this switch is in the ON position. Speaker On - Off - this switch turns the loudspeaker on the unit off. It would normally be off when using a headset to eliminate feedback. The yellow jacks allow remote operation. Push to talk - this momentary switch is pressed to speak to the chamber. Volume - the control for the operator determines loudness of communication from chamber. The controls for the inner and outer lock determine the volume level in the chamber. Battery Condition (indicator) - displays visual indication of battery condition. On - steady light when unit is on indicates battery is in good charge state. Blink - blinking light indicates battery level is approaching a low level, approximately 3 hours of operating time left. Off - light is out when unit is on means the battery voltage is below that required for reliable operation. The first function to fail because of low voltage is down link communication in two-wire operation, (operator can hear locks but locks can’t hear operator). Tape recorder - output signal for driving external recorder. Output level is factory set for 300 mVRMS. Normally the volume levels should be well matched between locks and operator. If there is a great difference an investigation should be made into the possible cause. This might be an indication of deteriorating cable, electrical connections, lock speaker, or headset. Microphone - (input) jack for attaching microphone from operator headset. Headset - (input/output) jack for attaching headset earphones.

THEORY OF OPERATION

AMPLIFIER CARD 2832-202 7.1

Refer to the functional block diagram (figure 6) and schematics (figure 7 and 8) while reading this section. INPUT AMPLIFIER CIRCUIT - U1, U2 and U3, are differential input amplifiers, which accept dynamic microphone and Pre-Amplifier Microphone, level signals (0.1 to 50mV) and amplify them. Signals common to both inputs are rejected. The Common Mode Rejection (CMR) is 40dB. MIXER – U6-A mixes all divers microphone inputs. U6-B mixes tender & divers. BUFFER – U6-C is a unity gain. TAPE RECORDER – U6-D is an amplifier circuit to drive the tape recorder transformer. FILTER – U7 is band pass filter. U7-A, the first filter, is for tender output while U7-B, the second filter, is for the diver outputs. AUDIO POWER AMPLIFIERS – U9 and U10 are audio power amplifier integrated circuits connected in a bridge configuration. The output "floats" at approximately 6 volts and should never be connected to ground. The amplified audio output signal is directed to Inner & Outer Lock or operator through relays K1, K2 K3, and K4. PRE-AMP MIC DETECTION – U5 is voltage comparator IC. This circuit detects the microphone resistance and, if necessary, attenuates the diver signal using Q7, Q8, and Q9 MUTE CIRCUIT – U8 is part of the mute circuit. This circuit reduces the clicking noise heard when depressing PTT switch. BATTERY VOLTAGE SENSES CIRCUIT – U11 is used to sense the battery voltage. Controls the panel LED (battery condition indicator) that indicates operational status:

Good battery voltage - steady green light Low battery - blinking green light Below reliable operational range – steady red light

RELAYS Circuit – The five relays K1,K2,K3,K4, and K5 are activated through PTT switches. K1 relay cut the Panel Speaker and Panel Microphone, when Tender PTT Jack is activated by Hand Held PTT Microphone Jack. K2 relay switch Tender Earphone Jacks from Output to Input, when activating PTT All Divers Switch or Hand Held PTT Microphone Jack. K3 relay switch Diver 1 Microphone Jacks from Input to Output, when activating PTT All Divers Switch or Diver 1 PTT switch. K4 relay switch Diver 2 Microphone Jacks from Input to Output, when activating PTT All Divers Switch or Diver 2 PTT switch.

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THEORY OF OPERATION

BATTERY CHARGER CARD, 2324-202 7.2

The 2324-202 converts the AC power to a regulated DC voltage to operate the unit and charges the batteries. The charger card consists of Primary and Secondary Circuits, these two separated circuits are connected together through step down transformer. The step down transformer is a split bobbin design with a high insulation level that prevents dangerous leakage currents passing from the primary to secondary winding. The Creepage Distance and Air Clearance on the charger meet UL2601-1 Medical Electrical Equipments requirements. The primary circuit detects AC line voltage (110 or 220), then activates latching relays K1 & K2 to select the proper transformer primary winding connections. On the primary circuit there are 2 Micro fuses F1&F2 (400mA 250 Volt) have been mounted in socket holders. The fuses are small round cylinders mounted next to the AC cord connection, about the size of a pencil eraser. The Fuses are a single use safety device. They interrupt the current in the event of a massive short circuit. Consequently, a qualified technician should thoroughly investigate the cause of a blown fuse. The unit should be examined for the cause of the failure, and its safe operation verified before replacing the fuse and returning the unit to the field. The Secondary Circuit receives low voltage (20V AC) from transformer secondary winding then regulates the voltage at 14V DC. It automatically reduces the output voltage, in order to limit the maximum output current for charging the battery. It is designed to properly charge the internal battery without getting damage when battery is completely drained to zero. It protects batteries from overcharge by automatically switching to float charge of 13.8 To 14.0 Volts when batteries are fully charged. The secondary circuit provides low current to power front panel LED which indicates AC power is applied to unit. There is a fuse F3 in the secondary circuit located next to J2. If accidental reversing of internal battery terminals occurs, the fuse will blow to protect the electronic circuits and wires from damage. F3 fuse is replaceable with 3.15A-250V Slow Blow Micro Fuse.

ENTERTAINMENT AMPLIFIER CIRCUIT - Model 2820-4003E Only 7.3

Amplifies audio signal input from the jacks on the rear panel. Two input jacks are provided to facilitate stereo signals; stereo signals are summed and amplified as a monaural signal. The output signal is routed through U8C of the main amplifier card; this will disable the entertainment during PTT voice communications. The input summing occurs through R72, R73, and C89. The output of the summing circuit is attenuated via the front panel volume control and fed to U10,

19

THEORY OF OPERATION

FUNCTIONAL BLOCK DIAGRAM – MODEL 2820A-4003(E) 7.4

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MAINTENANCE

GENERAL 8.1

The inherent quality of your solid state AMCOM chamber communicator will provide years of continuous failure-free service, if properly used and maintained. There are two important areas of user care, which will determine the length of service you can expect from your equipment. 1. Take care of your equipment. Protect it, handle it with care, this is especially true when the

equipment is used in outdoor locations, or portable applications. 2. Clean your equipment. Cleaning involves: wiping off the dirt, use a damp cloth to wipe the

front panel. Other than cleaning there is no additional maintenance required. 3. If a problem is noted or suspected with the equipment, note the problem and symptoms and

schedule the equipment for maintenance. It is required for certain applications that a maintenance log is kept and all problems and corrective action are noted.

TROUBLE SHOOTING 8.2

Chamber Communicator Check-Out Procedures The following procedures can be used to do a functional check of your communicator, using a headset. Quick full duplex check - this brief procedure checks communicator functions in the simulcom mode, set all volume controls at mid-scale, and turn unit on. Operator Circuit Check

1. Identify headset microphone lead (the red banana plug) and headset earphone lead (the black banana plug). For the operator headset use Amron Model 2460-28 or 2401-28.

2. Plug in headset microphone to operator microphone jacks (input) and headset earphone to operator headset jacks (input/output). Speak into the boom microphone; you should be able to hear yourself talk. This verifies the operator circuit. If you cannot hear yourself, check to make sure the unit is turned on and check the battery condition indicator LED. Disconnect and/or remove the unit from the system and repeat the test. If the unit still does not work the system has an internal problem and will require the services of a person experienced with electronic equipment.

3. Talk from the inner lock with a headset, turn speaker off if there is a switch on the inner lock speaker. You should hear yourself talk. This verifies inner lock operation. Use Amron Model 2460-31R headset.

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MAINTENANCE

TROUBLE SHOOTING (Continued) 8.2

Operator Circuit Check (Continued)

4. If you do not hear yourself talk, verify the lock switch is on and the volume controls are set properly. This type of problem could have two causes, a problem between the inner lock jack and the communicator (i.e., a loose connection, broken wire, or a shorted circuit) or a problem within the unit itself.

5. If the operator can hear you talk the problem is associated with connections associated with the headset earphone side of the circuit. If the operator cannot hear you, but you can hear the operator, the problem is associated with the microphone circuit or connections.

6. Generally problems due to the wiring can be located by a close and thorough inspection of each and every connection between the units. Either problem may require the services of a person experienced with electronics.

7. Talk from the outer lock with headset. You should hear yourself in the earphones. This verifies outer lock operation. Use the same procedures as for the inner lock.

8. Talk to the inner lock with someone inside to check loudspeaker volume levels. Use push to talk function. If no sound is heard, be sure the lock speaker is turned on. If step 3 checks ok, then the problem is either within the unit (check relays K1 & K2 on 2820-200E) or with the speaker in the inner lock.

9. Talk to the outer lock with someone inside to check loudspeaker volume levels. Use push to talk function. Use same trouble shooting procedure as in step 5.

PROBLEMS AND THEIR POSSIBLE CAUSES 8.3

General A great number of problems are very simple failures and can often be found by a very careful and close inspection of the unit or system. Logical deductions and equipment familiarity can often reduce the suspected area to just one component or circuit. Often upon examination clues are revealed which can also aid in locating and correcting the problem. Visual inspections should include checking all screws for tightness, all solder joints for correctness, foreign material, and check connectors for proper insertion and alignment. Unit Does Not Operate Check to see that unit is turned on, speaker on. Check that battery condition is ok, (battery condition indicator) - operate from line voltage or charge batteries. Check to see that connections are proper, correct if necessary. Check operating voltage, using a digital voltmeter or equivalent, measure the voltage across the yellow push to talk jacks on the front panel of the unit. The voltage must be greater than 10 volts D.C. for the unit to operate reliably. Normal voltage is from 13.9 to 14.4 volts D.C. Lock cuts out or does not operate Check for intermittent connection, substitute system components with known good units to determine exact problem and correct fault.

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MAINTENANCE

23

PROBLEMS AND THEIR POSSIBLE CAUSES (Continued) 8.3

Push to talk does not function but operator hears lock. Check push to talk switch. Lock hears operator but operator cannot hear lock. Check to see if lock is connected; check to see that volume levels are not turned down. Low volume Check volume control settings, adjust if desired. Checks lock connections, correct if bad. Use lock radio field check procedure. Acoustic feed back (squeal or howl) Volume level set too high, or headset microphone is to close to speaker. Turn speaker off or use a headset extension speaker. The volume level of the operator’s voice level is factory set to a nominal level. This adjustment can be set in the field if the acoustic feedback is a persistent or annoying problem. See operator volume level adjustment procedure for details on how to set. Low battery indication Battery voltage is low, charge battery for a minimum of 24 hours to fully charge battery. Battery will charge anytime the unit is plugged into the AC line, make sure the AC power circuit being used is not switched off at night. The preferred method to charge the battery is with power off. The charger circuit is designed to maintain the battery at full charge during normal operation, and power can be left on without damage to the battery. Measuring across the yellow jacks on the front panel can check the battery voltage. Turn the unit on; if the unit is plugged into the AC line the measurement will be the output of the battery charger. To measure the battery voltage, disconnect the unit from the AC line. The voltage at full charge with the charger on should be between 13.0 and 14.0 volts. With the charger off, a fully charged battery should be between 11.75 and 12.5 volts. The battery voltage of a discharged battery (rechargeable) is 10.0 volts; the battery should not be operated below this point as permanent damage will occur. The rechargeable batteries used in the Amron communicators are a gel cell design. The battery capacity is 7.0 amp/hr; the quiescent current of the 2820-4003 is approx. 0.250 amps. This would provide a theoretical operating time of 26 hours. During usage the current requirement will increase depending upon the volume level setting, the number of speakers which are on, and when the push to talk function is used. The quoted life of the battery backup is approx. 20 hours. The gel cell battery has an expected life of 3 years or 200 charge discharge cycles. WARNING: Should it become necessary to change the 12V battery, be sure to connect the RED wire to the Positive terminal and the BLACK wire to the Negative terminal. A momentary reversal of polarity will destroy the electronics of unit. There is a fuse F3 in the charger card secondary circuit located next to J2. When reversing internal battery terminals, this fuse will blow to protect the electronic circuits and wiring from being damaged. F3 fuse is replaceable with 3.15A-250V Slow Blow Micro Fuse.

DRAWINGS & SCHEMATICS

GENERAL 9.1

The following drawings illustrate the electrical and mechanical details of the lock communication unit. The corresponding parts lists for each drawing are detailed in the parts lists section. Revisions As drawings are updated, information about changes is incorporated into a revision sheet. This revision sheet appears in the manual immediately after the drawings. It lists the drawing number, reference designator of the part or parts involved and a description of the revision, and the effective serial number of the change. With this information the technician can determine the correct drawing for the current version, and any previous version, of the unit covered by this manual. If the revision is applicable for all versions of the unit, it is not included in the revision notice, as the change applies to all units.

24


SCHEMATIC 2820A-4003 9.2

25


SCHEMATIC 2820A-4003E 9.3

26


PARTS IDENTIFIER 2832-202 9.4

27


PARTS IDENTIFIER 2324-202 9.5

28


PARTS IDENTIFIER – FRONT PANEL 2820A-4003 9.6

29


PARTS IDENTIFIER – FRONT PANEL 2820A-4003E 9.7

30


PARTS IDENTIFIER – REAR CHASSIS 2820A-4003 & 2820A-4003E 9.8

31


MOUNTING DETAIL 2820A-4003 & 2820A-4003E 9.9

32

PARTS LIST

GENERAL 10.1

The following parts lists include all mechanical and electrical parts. The following information will be useful in data which is not self-explanatory. Revisions The parts lists in this manual are for the current model of lock communicator as of the printing date. If a different part was used in a previous build, details of the parts change are included in the revision listing sheet. This will enable you to determine the correct replacement part. If the new part is the recommended replacement part for all units, the old part is not listed in the revision listing. To Order Replacement Parts Contact:

Amron international Diving Supply, Inc. 1380 Aspen Way, Vista, California, 92081 U.S.A. Telephone: (760) 208-6500 Fax: (760) 599-3857

Email: [email protected] Web: www.amronintl.com

When ordering replacement parts, you should give as much information as possible to enable us to supply the correct part. This information should include the part number, description, reference designator, value, radio model number, and serial number. Failure to provide sufficient information may hinder our ability to fill your parts orders promptly and correctly.

33

PARTS LIST

MODEL 2820A-4003 CHAMBER COMMUNICATOR 10.2

Reference Part Number Description 1 ....................................2832-202-05...............................P.C CARD ASSEMBLY 2 ....................................2820A-4003-400 ........................FRONT PANEL ASSEMBLY WIRED 3 ....................................2820A-4003-500C......................CHASSIS ASSEMBLY 4 ....................................2405-28 ......................................MICROPHONE PUSH TO TALK 5 ....................................2-520194-2.................................SLIDE TERM. (18/22).032 X .187 6 ....................................8-32X3/8SSPHP ........................SCREW 8-32X 3/8IN SS PH PHILL 7 ....................................8-32X1/4SSPHP ........................SCREW 8-32X1/4IN SS PH PHILL 8 ....................................8ISW...........................................WASHER NO 8 INTERNAL STAR S/S 9 ....................................8FWF..........................................WASHER FLAT FIBER NO 8 10 ..................................2890-05 ......................................BATTERY 12VDC SLIDE TERM. GEL 11 ..................................8-32X3/4KTSB ...........................SCREW, KNURLED THUMB BRASS 12 ..................................2820A-4003/MANUAL................OPERATIONS MANUAL 13 ..................................MS-3106A-20-27S .....................MS CONN CABLE 4 PIN F 14 ..................................MS-3057-12A .............................MS CABLE CLAMP 20/22 SHELL 15 ..................................492 .............................................HANDLE ROUND 1.5X5.5X5/16 EA 16 ..................................P-2392........................................CORD, AC EURO 3 COND 17 ..................................10-32X1/2SSPHP ......................SCREW, 1032X1/2” SS PH PL 18 ..................................10LWSSS...................................WASHER SPLIT LOCK NO 10 S/S 19 ..................................3500 ...........................................CABLE TIE NY 3/32IN X 3.5IN 20 ..................................ME161-2003...............................JACK PHONO W/NYL WSHRS NKL/BLK 21 ..................................2324-J2 ......................................J2 CABLE ASSEMBLY 22 ..................................2836 ...........................................SHORTY BUSHING .750 HOLE 23 ..................................8511-30-00.................................CLIP CORD WHITE STYLE C2A 24 ..................................TAT-1/8 ......................................HEAT SHRINK TUBING 1/8IN BLACK

34

PARTS LIST

MODEL 2820A-4003E CHAMBER COMMUNICATOR, W/ENTERTAINMENT 10.3 Reference Part Number Description 1 ....................................2832-202-06...............................P.C CARD ASSEMBLY 2. ...................................2820A-4003E-400......................FRONT PANEL ASSEMBLY WIRED 3 ....................................2820A-4003-500C......................CHASSIS ASSEMBLY 4 ....................................2405-28 ......................................MICROPHONE PUSH TO TALK 5 ....................................2-520194-2.................................SLIDE TERM. (18/22).032 X .187 6 ....................................8-32X3/8SSPHP ........................SCREW 8-32X 3/8IN SS PH PHILL 7 ....................................8-32X1/4SSPHP ........................SCREW 8-32X1/4IN SS PH PHILL 8 ....................................8ISW...........................................WASHER NO 8 INTERNAL STAR S/S 9 ....................................8FWF..........................................WASHER FLAT FIBER NO 8 10 ..................................2890-05 ......................................BATTERY 12VDC SLIDE TERM. GEL 11 ..................................8-32X3/4KTSB ...........................SCREW, KNURLED THUMB BRASS 12 ..................................2820A-4003/MANUAL................OPERATIONS MANUAL 13 ..................................MS-3106A-20-27S .....................MS CONN CABLE 14 PIN F 14 ..................................MS-3057-12A .............................MS CABLE CLAMP 20/22 SHELL 15 ..................................492 .............................................HANDLE ROUND 1.5X5.5X5/16 EA 16 ..................................P-2392........................................CORD, AC EURO 3 COND 17 ..................................10-32X1/2SSPHP ......................SCREW, 1032X1/2” SS PH PL 18 ..................................10LWSSS...................................WASHER SPLIT LOCK NO 10 S/S 19 ..................................3500 ...........................................CABLE TIE NY 3/32IN X 3.5IN 20 ..................................ME161-2003...............................JACK PHONO W/NYL WSHRS NKL/BLK 21 ..................................2324-J2 ......................................J2 CABLE ASSEMBLY 22 ..................................2836 ...........................................SHORTY BUSHING .750 HOLE 23 ..................................8511-30-00.................................CLIP CORD WHITE STYLE C2A 24 ..................................TAT-1/8 ......................................HEAT SHRINK TUBING 1/8IN BLACK

35

PARTS LIST

2820A-4003-400M FRONT PANEL ASSEMBLY 10.4

Reference Part Number Description 1. ...................................2820A-4003-001 ........................FRONT PANEL 2820A-4003 3. ...................................SA818.........................................SPEAKER 8 OHM 15 WATT 4. ...................................1498-103 ....................................JACK BANANA BLACK 5. ...................................1498-102 ....................................JACK BANANA RED 6. ...................................1498-107 ....................................JACK BANANA YELLOW 7. ...................................ME161-2003...............................JACK PHONO W/NYL WSHRS NKL/BLK 8. ...................................LEDGREEN ...............................LED GREEN BRITE 9 ....................................LEDHOLDER-BLK.25 ................MOUNTING CLIP FOR 5MM LED 10 ..................................SWB-0001..................................BOOT, TOGGLE SOFT GRAY 11. .................................SW-201 ......................................SWITCH TOGGLE ON/OFF DPDT 12. .................................SW-208 ......................................SWITCH TOGGLE DPDT-MOMENTARY 14 ..................................KLN-500B-1/4 ............................KNOB BLACK AL .5DIA .25IN SHAFT 15 ..................................91A1AB24B15............................POTENTIOMETER 10K LINEAR 16 ..................................24XX-MIC...................................MICROPHONE ASSEMBLY ELECTRET 17 ..................................LT2462-24-D51 ..........................LED BI-COLOR RED/GREEN 18 ..................................1/4-20NUTSSL...........................NUT NYLOK 1/4-20 19 ..................................1/4-20X1.25HSBHC...................SCREW 1/4-20 X 1.25IN S/S 20 ..................................1/4FWSS....................................WASHER FLAT 1/4 304 S/S 21 ..................................M-2786 .......................................NUT A/B POTS

2820A-4003E-400M FRONT PANEL ASSEMBLY, ENTERTAINMENT 10.5

Reference Part Number Description 1. ...................................2820A-4003E-001......................FRONT PANEL 2820A-4003 3. ...................................SA818.........................................SPEAKER 8 OHM 15 WATT 4. ...................................1498-103 ....................................JACK BANANA BLACK 5. ...................................1498-102 ....................................JACK BANANA RED 6. ...................................1498-107 ....................................JACK BANANA YELLOW 7. ...................................ME161-2003...............................JACK PHONO W/NYL WSHRS NKL/BLK 8. ...................................LEDGREEN ...............................LED GREEN BRITE 9 ....................................LEDHOLDER-BLK.25 ................MOUNTING CLIP FOR 5MM LED 10 ..................................SWB-0001..................................BOOT, TOGGLE SOFT GRAY 11. .................................SW-201 ......................................SWITCH TOGGLE ON/OFF DPDT 12. .................................SW-208 ......................................SWITCH TOGGLE DPDT-MOMENTARY 14 ..................................KLN-500B-1/4 ............................KNOB BLACK AL .5DIA .25IN SHAFT 15 ..................................91A1AB24B15............................POTENTIOMETER 10K LINEAR 16 ..................................24XX-MIC...................................MICROPHONE ASSEMBLY ELECTRET 17 ..................................LT2462-24-D51 ..........................LED BI-COLOR RED/GREEN 18 ..................................1/4-20NUTSSL...........................NUT NYLOK 1/4-20 19 ..................................1/4-20X1.25HSBHC...................SCREW 1/4-20 X 1.25IN S/S 20 ..................................1/4FWSS....................................WASHER FLAT 1/4 304 S/S 21 ..................................M-2786 .......................................NUT A/B POTS

36

PARTS LIST

37

2820A-4003-500C CHASSIS ASSEMBLY 10.6 Reference Part Number Description 1 ....................................4003-005 ....................................BRACKET SUPPORT RAIL 2 ....................................2820-022 ....................................CHASSIS BATTERY BOX-UNIVERSAL 3 ....................................2820-013 ....................................CHASSIS UNIVERSAL CARD 4 ....................................MS-3102A-20-27P .....................MS CONN BULKHEAD 14 PIN M 5 ....................................4NUTSSL ...................................NUT LOCKING 4-40 S/S 6 ....................................8ISW...........................................WASHER NO 8 INTERNAL STAR S/S 7 ....................................8NUTSS .....................................NUT 8-32 S/S 8 ....................................4-40X3/8SSPHP ........................SCREW 4-40 3/8IN S/S PH PHIL 9 ....................................8-32X1/4SSPHP ........................SCREW 8-32 1/4IN S/S PH PHIL 10 ..................................8-32X5/8SSPHP ........................SCREW 8-32 5/8IN S/S PH PHIL 11 ..................................8NUTSSL ...................................NUT LOCKING 8-32 S/S 12 ..................................MFCCA-1/2 ................................SPONGE1/2CC ADH BLK 42INX70IN 13 ..................................2823-6002 ..................................CHARGER CHASSIS ASSEMBLY 14 ..................................GEE62F-C0................................GROMMET EDGING BLACK 15 ..................................2324-J1-9.0 ................................HARNESS 9” POWER ENTRY

2820A-4003-FS FIELD SPARES KIT, 2820A-4003 10.7 Reference Part Number Description Quantity 1 ....................................SW-201 ......................................SWITCH TOGGLE ON/OFF DPDT 1 2 ....................................SW-208 ......................................SWITCH TOGGLE DPDT-MOM 1 3 ....................................1498-102 ....................................JACK BANANA RED 2 4 ....................................1498-103 ....................................JACK BANANA BLACK 2 5 ....................................1498-107 ....................................JACK BANANA YELLOW 2 6 ....................................SWB-0001..................................BOOT, TOGGLE SOFT GRAY 2 7 ....................................91A1AB24B15............................POTENTIOMETER 10K LINEAR 1 8 ....................................KLN-500B-1/4 ............................KNOB BLACK AL .5DIA .25IN SHAFT 1 9 ....................................M-2786 .......................................NUT A/B POTS 2 10 ..................................8-32X3/4KTSB ...........................SCREW, KNURLED THUMB BRASS 2

OPTIONAL SPARES 10.8 Reference Part Number Description Quantity 1 ....................................2832-202-05...............................P.C CARD ASSEMBLY 1 2 ....................................2832-202-06...............................P.C CARD ASSEMBLY, ENT 1 3 ....................................2823-6002 ..................................CHARGER CHASSIS ASSEMBLY 1 4 ....................................2405-28 ......................................MICROPHONE PUSH TO TALK 1 5 ....................................2890-05 ......................................BATTERY 12VDC SLIDE TERM. GEL 1

2820A-4003 Title.pdfInstruction ManualForAmron International Diving Supply, Inc.Model 2820A-4003 & 2820A-4003E Chamber Communicator

S/NThis manual and the information contained herein is provided for use as an operation and maintenance guide. No license or rights to manufacture, reproduce, or sell either the manual or articles described herein are given. Amron International Diving Supply, Inc. reserves the right to change specifications without notice.Amron International Diving Supply, Inc.1380 Aspen WayVista, California 92081 U.S.APhone:(760) 208-6500Fax (760) 599-3857 Email: [email protected]: www.amronintl.comCopyright © 2009, Amron International, Inc. Revised August 2010

2820A-4003 ContentsCONTENTS SECTIONSpecifications 1General Information 2Description 2.1Description 2820A-4003E 2.2Drawing, Front Panel Controls Model 2820A-4003 2.3Drawing, Front Panel Controls Model 2820A-4003E 2.4Options 3Warranty and Service Policy 4

Limited Warranty 4.1Service Policy 4.2Controls and Connections 5

General 5.1Operator Controls 5.2Operator Connections 5.3Drawing, Operator Connections - P.T.T. Microphone 5.4Drawing, Operator Connections - Headset 5.5Drawing, Chamber Connections 5.6Installation & Operation 6

Installation 6.1Push to Talk Microphone Connections 6.2Headset Connections 6.3Initial Set Up 6.4Headset Operation 6.5Description of Operator Controls 6.6 Theory of Operation 7

Amplifier Card 2832-202 7.1Battery Charger Card, 2324-202 7.2Entertainment Amplifier Circuit 7.3Functional Block Diagram - Model 2820A-4003 7.4Maintenance 8

General 8.1Trouble Shooting 8.2Problems and their Possible Causes 8.3Adjustments 8.4Drawings 9

General 9.1Schematic 2820A-4003 9.2Schematic 2820A-4003E 9.3Parts Identifier 2832-202 9.4Parts Identifier 2324-202 9.5Parts Identifier - Front Panel 2820A-4003 9.6Parts Identifier - Front Panel 2820A-4003E 9.7Parts Identifier - Rear Chassis 2820A-4003 & 2820A-4003E 9.8Mounting Detail 2820A-4003 & 2820A-4003E 9.9Parts List 10

General 10.1Model 2820A-4003 Chamber Communicator 10.2Model 2820A-4003E Chamber Communicator w/ Entertainment 10.32820A-4003-400M Front Panel Assembly 10.42820A-4003E-400M Front Panel Assembly, Entertainment 10.52820A-4003-500C Chassis Assembly 10.62820A-4003-FS Field Spares Kit, Model 2820A-4003 10.7Optional Spares 10.8

2820A-4003 Chp1SPECIFICATIONS 1.1 ElectricalInput Impedance (each Input) 250 OhmsFrequency Response 300 - 10000 HzCommon Mode Rejection 40 dB MinimumCurrent Drain Maximum Full Volume 3 ADCMinimum Quiescent 0.250 ADCOutput Impedance 4 OhmDC Power Requirements Voltage 12 VDC Nominal(For Operation on External) - Range 9 Volts Min. - 18 Volts MaximumBattery Current 3 Amps PeakSensitivity (input) 16 mVrmsOutput Power (Peak @ 4 Ohm Load, 12 Vdc) 20 Watts AudioBattery Backup Life 20 HoursOperating Voltage 115/230 Volts AC 50/60 Hz Electrical Model 2820-4003E, Entertainment OptionOutput Power 6 WattsSensitivity (input) 1 VoltMechanicalPanel Stainless SteelEnclosure Black Anodized AluminumDimensionsLength 10.125 in. (25.7 cm) Depth 7.5 in. (19.1 cm) Height 7.5 in. (19.1 cm)Weight With Batteries 15 lbs. (6.8 kg)

2820A-4003 Chp2DESCRIPTION 2.1 The AMRON INTERNATIONAL Inc., AMCOM II Model 2820A-4003 and 2820A-4003E are decompression chamber communication systems, providing two-way communications between the chamber operator and the occupants of the chamber. The Model 2820A-4003 & 2820A-4003E are used in conjunction with a chamber talk back speaker i.e., the Amron Model 3113, 3114, 3115, 3125 or 3126. The Model 2820A-4003E is exactly the same as the 2820A-4003, but also includes a separate entertainment channel, amplifier. This is used with the Model 3130 entertainment speaker to provide music (audio) to the chamber occupants. All references to the Model 2820A-4003 apply as well to the 2820A-4003E.The AMCOM II chamber communication systems are full feature hard wire, two lock communicator systems. The AMCOM II has independent volume controls (operator, inner lock, & outer lock.), as well as separate on/off controls for each lock. Both models are supplied with hand-held microphones, for use by the operator. The 2820A-4003 has the capability of two modes of operation, a simple intercom type operation, or telephone type operation using headsets both inside and outside the chamber. The two modes are known as, 2-wire and/or full duplex (4-wire) communications. The two-wire mode of operation is a simplex type system. The operator monitors the chamber conversations via a talkback speaker mounted on the front panel of the unit. The operator can talk to the occupants by using the hand held microphone, or by using the Push-To-Talk (PTT) switch and speaking into the front panel talk back speaker. Inside the chamber is a talk back speaker, which picks up the sounds within the chamber. When the operator speaks to the chamber, the 2820A-4003 connects the chamber internal speaker to the amplifier output and the operator voice is broadcast to the chamber occupants. All switching operations take place outside the chamber.The full duplex mode of operation requires the use of two headsets, one for the operator and one for use inside the chamber. Conversations are full duplex, and occur as with a telephone, and do not require the use of the PTT switch. Additional headsets can be used both inside and outside the chamber, allowing several parties to communicate. The system also permits mixed operation, however any mixed operation does require the use of the PTT switch. The PTT switch also provides an over-ride function, operator conversation over-rides occupant. Full duplex is a communications system designed from the “ground-up” to take advantage of the current “state of the art” in semiconductor technology and provide superior communications.The unit operates from 115/230 VAC 50/60 Hz and has internal rechargeable battery back-up. It also can be operated from an external 12 VDC power source.DESCRIPTION, 2820A-4003E 2.2

The model 2820A-4003E has a separate amplifier to provide entertainment audio for use in the chamber. The entertainment audio output is connected to a separate speaker within the chamber, i.e., the Amron model 3130. Stereo input connections (RCA jacks) are provided on the back panel for connection to the desired audio entertainment source. The audio source can be audio (music) from any source i.e., AM, FM, tape recorder, CD player, TV or other source as desired.The 2820A-4003E has a separate ON/OFF, volume control for the entertainment channel, also the entertainment audio is interrupted whenever the hand held microphone or the push-to-talk switch is used. This automatically cuts off entertainment audio to the chamber entertainment speaker when voice communications are in process, (operator to chamber, PTT).FRONT PANEL CONTROLS MODEL 2820A-4003 2.3FRONT PANEL CONTROLS MODEL 2820A-4003E 2.4

2820A-4003 Chp3OPTIONS 3.1 Model 2821-28 Remote Push-To-Talk (2-Wire Operation)AMRON headset extension with push-to-talk belt module, jacks for headset, and 25 cable. (Use with Model 2460-28 or Model 2401-28 headset).Model 2822-28 Remote Walk-and-Talk (4-Wire Operation)Amron full duplex (4-wire) headset extension, belt module with 25 feet cable. (Use with Model 2460-28 headset)Model 2460-28 HeadsetHeadset with boom microphone and color coded dual banana plugs to mate color coded inputs on Amron communicators and accessory items.Model 2460SM-28Single earphone with same functions as 2460-28.Model 3113 Chamber Comm. BoxDecompression chamber communication box. Folded acoustic horn talk-back speaker, 15 watt, headset jack, MS input connector.Model 3114 Chamber Comm. BoxDecompression chamber communication box. Three inch talk-back speaker, mylar impregnated cloth cone, three foot SJO cord.Model 3115 Chamber Comm BoxDecompression chamber communication box. Same as Model 3113, also has a speaker ON/OFF switch.Model 3125 Chamber Combo BoxDecompression chamber combination communication/junction box, designed for inner lock functions. Mounts direct to chamber penetrator (eliminating chamber wiring), includes; penetrator adapter bushing, chamber talk-back speaker, speaker ON/OFF switch, headset jack, temperature probe, sound powered phone & bracket, and power connection circuit for chamber internal conditioning system & chamber scrubber. Model 3126 Chamber Combo BoxDecompression chamber combination communication box, outer-lock design. Mounts direct to chamber penetrator (eliminating chamber wiring), includes penetrator adapter bushing, chamber talk-back speaker, speaker ON/OFF switch, headset jack, sound powered phone & bracket.Model 3127 Chamber Junction BoxOutside junction box, for use with the Model 3125 & 3126. Includes 12 pin electrical penetrator, mounting adapter, and MS connector to mate with Model 3128 wiring harness.OPTIONS (Continued) 3.1

Model 3128 Chamber Wiring Harness (Custom)Decompression chamber wiring harness, one end connects directly to 2820-4003, other end connects to model 3127 junction box. Pre wired, tested and customized to your chamber size requirements.Model 3130 Chamber Entertainment SpeakerDecompression chamber entertainment speaker. Speaker is 15 watt, 8 inch, music quality, mylar impregnated cloth cone. Includes 6 each headset jacks, for mini phone plugs.Model 2460-31R HeadsetHeadset with boom microphone, for use in decompression chambers, has 4 pin connector to plug directly into chamber comm boxes. Model 2460-31R-25 Headset ExtensionIntegrated headset extension for Model 2460-31R headset when used with chamber communications boxes. Flexible 25 foot cord, with 4 pin audio connector.

2820A-4003 Chp4LIMITED WARRANTY 4.1 AMRON INTERNATIONAL DIVING SUPPLY, INC. warrants that it’s products are free from defects in material and workmanship under normal use and service, as described in AMRON INTERNATIONAL DIVING SUPPLY, Inc.. Literature covering this product, for a period of 90 days from date of shipment. Amron’s obligation under this warranty is limited to the repair of or replacement, at AMRON’S option, of defective material. This warranty shall not cover defects which are the result of misuse, negligence, accident, repair or alterations.SERVICE POLICY 4.2

AMRON INTERNATIONAL encourages owners of equipment to call (760) 208-6500 for assistance if problems are encountered. Every effort will be made to assist in solving your problem. Equipment which must be returned to the factory for repairs should be safely packaged, insured, and shipped prepaid to:Amron International, Inc.1380 Aspen wayVista, CA 92081Be sure to include the following information:Your Name

Your Company Shipping AddressPhone NumberContact NameA short description of the problem is most helpful.Valid in warranty repairs will be made at no charge. Out of warranty repairs will be handled in the same fashion, except you will be advised of the repair charges before any work is done.

2820A-4003 Chp5GENERAL 5.1 Before using the AMCOM II chamber communications system, you should familiarize yourself with its operating controls and connections. Improper use of controls and connections may deprive the user of the full benefit of this communication system. Reference: Figure 1 & 2 Front Panel model 2820A-4003 and 2820A-4003E.OPERATOR CONTROLS 5.2

Power SwitchTurns unit on/off, applies power to the unit from internal rechargeable batteries or from external source.Speaker SwitchTurns Speaker ON/OFF.PANEL MICROHPONECondenser microphone to pickup tender voice, it operates when Speaker Switch is ON and PTT Switch is depressed.P.T.T. Switch Push to Talk Switch enables operator to speak to the occupants of the chamber, used in the 2-wire mode. Push to talk is not required when operating in full duplex (4-wire) mode. In the full duplex mode this switch allows the operator to interrupt all locks with a priority message.Volume Controls Controls the volume for the operator, adjusts the volume level of the audio originating in the inner and outer locks.OPERATOR CONNECTIONS 5.3

Tape Recorder (output) Is an RCA jack connection for tape recording conversations, output is approx 300 mVRMS.Microphone (input) Microphone input is a dual banana jack connection for the headset microphone. Jacks are color coded red.Headset (input/output) Headset is a dual banana jack connection for headset earphones, external remote speaker, or hand held push to talk microphone. In 2-wire mode of operation both headset microphone and earphones are plugged into this jack, conversation (up-link & down-link) are switched automatically when push to talk switch is actuated. In the full duplex mode this jack is listen only, both sides of the conversations are heard (to and from the chamber). Jacks are color coded black.OPERATOR CONNECTIONS (Continued) 5.3

P.T.T. (input)Push To Talk (input) Is a dual banana jack connection for remote keying of push to talk single contact closure, close to talk to the chamber, open to listen to the chamber. Banana jacks are color coded yellow.Battery Condition Indicator tells whether the unit is on or off and provides information regarding the condition of the backup battery power. If the unit is being operated from AC power the light will be on steady. If the unit is operating from the internal batteries (AC power is off or if the unit is not plugged in), the indicator will display the condition of the battery charge, as follows;1. A steady green light indicates batteries are of sufficient voltage to operate the unit.2. Blinking green light indicates batteries are approaching a low level, approximately 3 hour operating time left, from the time the light began to blink.3. A steady red light indicates battery voltage below reliable operating level. First function to fail will be communications to the chamber, (PTT) in the 2-wire mode of operationNote: Unit must be on for 5 minutes before display can be considered accurate. Batteries tend to recover when turned off, this condition is known as surface charge. Due to the surface charge the voltage will be high when first turned on and will drop rather quickly to its actual level.Lock Controls1. Volume - Inner Lock Controls volume level of operator’s voice as heard by the inner lock. In the full duplex mode of operation it sets the lock’s side-tone volume (headset).2. Volume - Outer Lock, Controls volume level of operator’s voice as heard by the inner lock. In the full duplex mode of operation it sets the lock’s side tone volume (headset).3. On/Off- Inner Lock - Disconnects inner lock, disables all communication with the inner lock.4. On/Off - Outer lock - Disconnects outer lock, disables all communication with the outer lock. OPERATOR CONNECTIONS (Continued) 5.3

Entertainment Controls, Model 2820A-4003E OnlyVolume - Adjusts the volume level of the entertainment audio within the chamber and is located with the inner lock group of controls.Rear Panel ConnectionsMS Connector - Electrical connections to chamber, inner and outer lock audio signals, entertainment channel output (2820A-4003E only) and power connections for operation from a 12 VDC source.Entertainment input jacks - Model 2820A-4003E only, two each RCA type jacks for audio input (two jacks are provided for stereo input, signal is mixed internally for a monaural output). AC Inlet Jack – Standard jack for AC power cord, supplied with units.2820A-4003 PUSH TO TALK MICROPHONE 5.42820A-4003 HEADSET CONNECTION 5.5SCHEMATIC CONNECTION MODEL 2820A-4003 TO CHAMBER 5.6

2820A-4003 Chp6INSTALLATION 6.1 Chamber communication wiring - see examples outlined on schematic 2820A-4003 and the 3128 if purchased. Connect the lock speakers to the cabling harness. The lock speaker is normally wired to the microphone lines (J1 Pins A & B or E & F)Turn power off, AC power unplugged, connect chamber wiring cable connector to J-1.Plug 2820A-4003 into AC power source, 100/240 VAC 50/60 Hz. Connect audio source to RCA jacks (model 2820A-4003E only), if stereo connect left channel to one jack and right channel to other jack, if monaural source connect to either jack.Unit is now ready for test, functionally test unit as described, par 6.4.Install unit into panel cutout, and fasten with four brass thumbscrews provided.PUSH TO TALK MICROPHONE CONNECTIONS 6.2

The push to talk microphone has two dual banana plugs. Insert the yellow banana plug into the yellow jacks, (push to talk jacks on front of 2820A-4003). Insert the black dual banana plug into the black jacks, (jacks labeled headset on the front of the 2820A-4003). A microphone holder is provided on the front panel to facilitate storage of the microphone when not being used.HEADSET CONNECTIONS 6.3

Connect headset by inserting the red and black banana plugs into the red and black jacks on the front of the 2820A-4003 panels, note headset is an optional item.INITIAL SET UP 6.4

Check to see that the inner lock, outer lock, and speaker switch are all on. Set volume controls to low. Confirm that AC power is available; AC power LED indicator should be on. Turn power ON. Check to see that battery condition indicator LED is on.Have someone in the inner lock talk, and adjust operator volume control to a comfortable listening level.Operator should then give a short count, use hand held microphone. Operation of the unit with the microphone is simple and straightforward. Hold the microphone about 1 inch away from mouth, depress the push to talk lever on the side of the microphone and speak clearly and directly into the microphone. Release the push to talk lever when finished. Someone in the inner lock should determine what is a comfortable listening level having the operator adjust as needed, (adjust the inner lock volume control).Adjustment of volume controls, volume levels should be sufficient to ensure good communications. If excessive feedback occurs see SECTION 8.2 for instructions on adjusting the operator volume level to the chamber. This adjustment should be made to optimize the volume levels during initial installation. Confirm that the inner lock on/off switch works properly. When off, all communication to and from inner lock stops.HEADSET OPERATION 6.5

Test headset operation (if desired). Note with operator and inner lock on headset, you do not need to use the push to talk switch.Depressing the push to talk switch when using headsets, cuts off the locks allowing the operator to have priority. This feature provides the operator the ability to interrupt a conversation and convey an important message.When communicating with a headset inside the chamber it is not necessary to use the push to talk switch. All headsets (i. e. Operator, inner lock, outer lock) can talk to each other without using the push to talk function. This permits a three party conversation similar to that of a telephone. You may find it necessary to turn off the 2820A-4003 speaker while the operator is using a headset. A feedback condition can occur while using a headset (headset microphone is receiving the sound from the speaker causing the feedback) it will depend upon two factors, the volume level and the distance between the headset and the speaker.Repeat the above procedures for the outer lock.DESCRIPTION OF OPERATOR CONTROLS 6.6

Power On - Off - this switch controls power to the unit. This switch does not disable the battery charging circuit. The battery condition indicator should come on when this switch is in the ON position.Speaker On - Off - this switch turns the loudspeaker on the unit off. It would normally be off when using a headset to eliminate feedback. The yellow jacks allow remote operation.Push to talk - this momentary switch is pressed to speak to the chamber.Volume - the control for the operator determines loudness of communication from chamber. The controls for the inner and outer lock determine the volume level in the chamber.Battery Condition (indicator) - displays visual indication of battery condition. On - steady light when unit is on indicates battery is in good charge state. Blink - blinking light indicates battery level is approaching a low level, approximately 3 hours of operating time left. Off - light is out when unit is on means the battery voltage is below that required for reliable operation. The first function to fail because of low voltage is down link communication in two-wire operation, (operator can hear locks but locks can’t hear operator).Tape recorder - output signal for driving external recorder.Output level is factory set for 300 mVRMS. Normally the volume levels should be well matched between locks and operator. If there is a great difference an investigation should be made into the possible cause. This might be an indication of deteriorating cable, electrical connections, lock speaker, or headset.Microphone - (input) jack for attaching microphone from operator headset.Headset - (input/output) jack for attaching headset earphones.

2820A-4003 Chp7AMPLIFIER CARD 2832-202 7.1 Refer to the functional block diagram (figure 6) and schematics (figure 7 and 8) while reading this section.INPUT AMPLIFIER CIRCUIT - U1, U2 and U3, are differential input amplifiers, which accept dynamic microphone and Pre-Amplifier Microphone, level signals (0.1 to 50mV) and amplify them. Signals common to both inputs are rejected. The Common Mode Rejection (CMR) is 40dB.MIXER – U6-A mixes all divers microphone inputs. U6-B mixes tender & divers.BUFFER – U6-C is a unity gain.TAPE RECORDER – U6-D is an amplifier circuit to drive the tape recorder transformer.FILTER – U7 is band pass filter. U7-A, the first filter, is for tender output while U7-B, the second filter, is for the diver outputs.AUDIO POWER AMPLIFIERS – U9 and U10 are audio power amplifier integrated circuits connected in a bridge configuration. The output "floats" at approximately 6 volts and should never be connected to ground. The amplified audio output signal is directed to Inner & Outer Lock or operator through relays K1, K2 K3, and K4.PRE-AMP MIC DETECTION – U5 is voltage comparator IC. This circuit detects the microphone resistance and, if necessary, attenuates the diver signal using Q7, Q8, and Q9MUTE CIRCUIT – U8 is part of the mute circuit. This circuit reduces the clicking noise heard when depressing PTT switch.BATTERY VOLTAGE SENSES CIRCUIT – U11 is used to sense the battery voltage. Controls the panel LED (battery condition indicator) that indicates operational status:Good battery voltage - steady green lightLow battery - blinking green lightBelow reliable operational range – steady red lightRELAYS Circuit – The five relays K1,K2,K3,K4, and K5 are activated through PTT switches.K1 relay cut the Panel Speaker and Panel Microphone, when Tender PTT Jack is activated by Hand Held PTT Microphone Jack.K2 relay switch Tender Earphone Jacks from Output to Input, when activating PTT All Divers Switch or Hand Held PTT Microphone Jack.K3 relay switch Diver 1 Microphone Jacks from Input to Output, when activating PTT All Divers Switch or Diver 1 PTT switch.K4 relay switch Diver 2 Microphone Jacks from Input to Output, when activating PTT All Divers Switch or Diver 2 PTT switch.BATTERY CHARGER CARD, 2324-202 7.2

The 2324-202 converts the AC power to a regulated DC voltage to operate the unit and charges the batteries. The charger card consists of Primary and Secondary Circuits, these two separated circuits are connected together through step down transformer.The step down transformer is a split bobbin design with a high insulation level that prevents dangerous leakage currents passing from the primary to secondary winding. The Creepage Distance and Air Clearance on the charger meet UL2601-1 Medical Electrical Equipments requirements. The primary circuit detects AC line voltage (110 or 220), then activates latching relays K1 & K2 to select the proper transformer primary winding connections. On the primary circuit there are 2 Micro fuses F1&F2 (400mA 250 Volt) have been mounted in socket holders. The fuses are small round cylinders mounted next to the AC cord connection, about the size of a pencil eraser. The Fuses are a single use safety device. They interrupt the current in the event of a massive short circuit. Consequently, a qualified technician should thoroughly investigate the cause of a blown fuse. The unit should be examined for the cause of the failure, and its safe operation verified before replacing the fuse and returning the unit to the field.The Secondary Circuit receives low voltage (20V AC) from transformer secondary winding then regulates the voltage at 14V DC. It automatically reduces the output voltage, in order to limit the maximum output current for charging the battery. It is designed to properly charge the internal battery without getting damage when battery is completely drained to zero. It protects batteries from overcharge by automatically switching to float charge of 13.8 To 14.0 Volts when batteries are fully charged. The secondary circuit provides low current to power front panel LED which indicates AC power is applied to unit. There is a fuse F3 in the secondary circuit located next to J2. If accidental reversing of internal battery terminals occurs, the fuse will blow to protect the electronic circuits and wires from damage. F3 fuse is replaceable with 3.15A-250V Slow Blow Micro Fuse.ENTERTAINMENT AMPLIFIER CIRCUIT - Model 2820-4003E Only 7.3

Amplifies audio signal input from the jacks on the rear panel. Two input jacks are provided to facilitate stereo signals; stereo signals are summed and amplified as a monaural signal. The output signal is routed through U8C of the main amplifier card; this will disable the entertainment during PTT voice communications. The input summing occurs through R72, R73, and C89. The output of the summing circuit is attenuated via the front panel volume control and fed to U10, FUNCTIONAL BLOCK DIAGRAM – MODEL 2820A-4003(E) 7.4

2820A-4003 Chp8GENERAL 8.1 The inherent quality of your solid state AMCOM chamber communicator will provide years of continuous failure-free service, if properly used and maintained.There are two important areas of user care, which will determine the length of service you can expect from your equipment.1. Take care of your equipment. Protect it, handle it with care, this is especially true when the equipment is used in outdoor locations, or portable applications.2. Clean your equipment. Cleaning involves: wiping off the dirt, use a damp cloth to wipe the front panel. Other than cleaning there is no additional maintenance required.3. If a problem is noted or suspected with the equipment, note the problem and symptoms and schedule the equipment for maintenance. It is required for certain applications that a maintenance log is kept and all problems and corrective action are noted. TROUBLE SHOOTING 8.2

Chamber Communicator Check-Out ProceduresThe following procedures can be used to do a functional check of your communicator, using a headset. Quick full duplex check - this brief procedure checks communicator functions in the simulcom mode, set all volume controls at mid-scale, and turn unit on. Operator Circuit Check1. Identify headset microphone lead (the red banana plug) and headset earphone lead (the black banana plug). For the operator headset use Amron Model 2460-28 or 2401-28.2. Plug in headset microphone to operator microphone jacks (input) and headset earphone to operator headset jacks (input/output). Speak into the boom microphone; you should be able to hear yourself talk. This verifies the operator circuit. If you cannot hear yourself, check to make sure the unit is turned on and check the battery condition indicator LED. Disconnect and/or remove the unit from the system and repeat the test. If the unit still does not work the system has an internal problem and will require the services of a person experienced with electronic equipment. 3. Talk from the inner lock with a headset, turn speaker off if there is a switch on the inner lock speaker. You should hear yourself talk. This verifies inner lock operation. Use Amron Model 2460-31R headset.TROUBLE SHOOTING (Continued) 8.2

Operator Circuit Check (Continued)4. If you do not hear yourself talk, verify the lock switch is on and the volume controls are set properly. This type of problem could have two causes, a problem between the inner lock jack and the communicator (i.e., a loose connection, broken wire, or a shorted circuit) or a problem within the unit itself. 5. If the operator can hear you talk the problem is associated with connections associated with the headset earphone side of the circuit. If the operator cannot hear you, but you can hear the operator, the problem is associated with the microphone circuit or connections.6. Generally problems due to the wiring can be located by a close and thorough inspection of each and every connection between the units. Either problem may require the services of a person experienced with electronics. 7. Talk from the outer lock with headset. You should hear yourself in the earphones. This verifies outer lock operation. Use the same procedures as for the inner lock.8. Talk to the inner lock with someone inside to check loudspeaker volume levels. Use push to talk function. If no sound is heard, be sure the lock speaker is turned on. If step 3 checks ok, then the problem is either within the unit (check relays K1 & K2 on 2820-200E) or with the speaker in the inner lock. 9. Talk to the outer lock with someone inside to check loudspeaker volume levels. Use push to talk function. Use same trouble shooting procedure as in step 5.PROBLEMS AND THEIR POSSIBLE CAUSES 8.3

GeneralA great number of problems are very simple failures and can often be found by a very careful and close inspection of the unit or system. Logical deductions and equipment familiarity can often reduce the suspected area to just one component or circuit. Often upon examination clues are revealed which can also aid in locating and correcting the problem. Visual inspections should include checking all screws for tightness, all solder joints for correctness, foreign material, and check connectors for proper insertion and alignment. Unit Does Not OperateCheck to see that unit is turned on, speaker on. Check that battery condition is ok, (battery condition indicator) - operate from line voltage or charge batteries. Check to see that connections are proper, correct if necessary. Check operating voltage, using a digital voltmeter or equivalent, measure the voltage across the yellow push to talk jacks on the front panel of the unit. The voltage must be greater than 10 volts D.C. for the unit to operate reliably. Normal voltage is from 13.9 to 14.4 volts D.C.Lock cuts out or does not operateCheck for intermittent connection, substitute system components with known good units to determine exact problem and correct fault.PROBLEMS AND THEIR POSSIBLE CAUSES (Continued) 8.3

Push to talk does not function but operator hears lock.Check push to talk switch.Lock hears operator but operator cannot hear lock.Check to see if lock is connected; check to see that volume levels are not turned down.Low volumeCheck volume control settings, adjust if desired. Checks lock connections, correct if bad. Use lock radio field check procedure.Acoustic feed back (squeal or howl)Volume level set too high, or headset microphone is to close to speaker. Turn speaker off or use a headset extension speaker. The volume level of the operator’s voice level is factory set to a nominal level. This adj

Model 2820A-4003 & 2820A-4003E Chamber Communicator … · 2015. 11. 17. · Model 2460SM-28 ....

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Transcript of Model 2820A-4003 & 2820A-4003E Chamber Communicator … · 2015. 11. 17. · Model 2460SM-28 ....