Delmar Digicorder c

PROPEi?Y OFAL-SAUMA HOSPITAL

Model 483DigiCordeP

Solid-StateRecorder

SERVICE MANUALAV PUB 95-9

September, 1995

NOTICEProprietary tights of DEL MAR AVIONICS are involved with thesubject matter of this document and all manufacturing, repro-duction, use, and salas rights pertaining to such subject matterare expressly resewed. The recipient, by accepting this docu-ment, agrees that the infomtion contained herein will not beused, copied, or raproduced in whole or in part, nor its contentsrevealed in any manner or to any person, except to meet thepurpose for which thii document was prepared and delivered,without the express permission of Del Mar Avionics.

Del Mar Avionics1621 Alton Parkway, Irvine, CA 92714-4878

PHONE: (714) 250-3200 . FAX: (714) 261-0529TOLL-FREE TELEPHONE: 800-854-0481

Copyright 1995, Del Mar Avionics. All rights reserved. No part of this publication may be reproduced in any mannerwhatsoever without written permission from the owner.

DEL MAR and AVIONICS are registered trademarks of Del Mar Avionics.

Manufacturer�s Name: De/ Mar Avionics

Manufacturer�s Address: 1621 Alton ParkwayIrvine, California 91714United States of America

declares that the product

Product Name: Halter monitor tape recorder

Model Number: Model 483

conforms to the following standards:

FDAUL

51 OK Premarket ApprovedUL544 (Medical and Dental Equipment)

EMC: EN60601-1-2EN5501 1BIEC601-1IEC601-1-2

Office of Quality ManagerIrvine, California USANovember, 1995

Eurowan Contact: Del Mar Avionics, Vilvoordelan 5,193O Zaventum, Belgium

Manufacturer% Statement ?f RequiredTests and Preventive Maintenance

The Model 433 DigiCorder@� requires no mechanical maintenanceother than routine physical inspection of the case, visible components,and cables.

Memory modules should be tested periodically, by qualified technicalpersonnel, to assure that the rated memory capacity is accessible.Failure to conduct such periodic evaluation could result in failedrecordings.

Scope of Applications

The Model 433 DigiCorder is intended primarily as a Holter Recorder.However, the manufacturer has confirmed the ability of the product torecord ECG signals from which a Del Mar Holter Analysis Systemcan extract accurate data for ST-level analysis.

Measurement of Heart Rate is a function of the external HolterAnalysis System. Del Mar makes no claim for the Recorder in thisregard.

Although patient-hookup information suggests a configuration for LatePotential (Micropotential) analysis, the present sample rate precludesapplication of the Recorder for this purpose. Higher sample rates inlater models are expected to permit use of recordings for Late Poten-tial analysis.

Batteries

Observe battery polarity when installing batteries in the Recorder.

Do not attempt to recharge alkaline batteries.

Dispose of used batteries in accordance with localbatteries into a fite.

regulations. Do not throw

Follow the battery manufacturer�s instructions for use and recharging of batteries.

Standards Compliance

The Model 463 DigiCordeP is designed and manufactured to meet the followingstandards and requirements:

IEC 601-l (Medical Electrical Equipment; General Requirements for Safety)

IEC 601-l-2 (Medical Electrical Equipment; Electromagnetic Compatibility)

UL!544 (Medical and Dental Equipment)

Classifications

The Model 463 DigiCorder Recorder conforms to the following classifications as definedby IEC 601-l:

n Internally powered equipment, Type BF

n Ordinary equipment (not drip-proof, splash-proof, or watertight)

n Designed for continuous operation

n Not suitable for use in the presence of a flammable anaesthetic mixture with air orwith oxygen or nitrous oxide

The Model 463 DigiCorder Recorder is a Type 1 ambulatory ECG device according toANSl/AAMl EC36

CONTENTS

pageCHAPTER1 GENEReAL DESCRIPI’IONIntroduction ..........................l - lEquipment Description .................... l - lSpecifications. .........................l-2CHAPTER2 PREPARINGTHE RECORDERIntiuction . . . . . . . . . . . . . . . . . . . . . . . . ..2- 1Transferring Patient Information ............... 2-lInstalling the Memory Device ................ .2-2Installing Batteries or Battery Pack ............. 2-2

Installing Batteries ................... .2-3Intalling the Rechargeable Battery Pack ......... 2-4Automatic Self-Test .....................2-4

Initializing the Recorder ................... .2-5Enter Patient Identification ................ 2-5

Entering Patient ID Directly ............. 2-5Confirmmgthe Patient ID Number ......... 2-6

SetECGGain .......................2-7

Preparing a Memory Device ................. .2-8CHAPTER3 THEPATIENTHOOKUPIntroduction ..........................3-lPerforming the Patient Hookup ................ 3-1Universal Test Cable .....................3-2CHAPTER 4 TECHNICAL DESCRIPTIONGeneral Description ......................4-lSystem Block Diagram ................... .4-lDigiCorder PWA’s .......................4-2

Amplifier Assembly, PWA 26515 ............. 4-2Input Amplifier .................... 4-2High-Pass Filter, 0.05 Hz ............... 4-2Programmable Low-pass Filter ............ 4-2Programmable Gain Amplifier ............ 4-3

CPU Assembly, PWA 26528 ............... .4-3Block Diagram. ................... .4-3Microprocessor ................... .4-4R O M . . . . . . . . . . . . . . . . . . . . . . . . ..4- 4SBAM . . . . . . . . . . . . . . . . . . . . . . . ..4- 4PCMCIA Port .................... .4-4Time-of-Day and Date Clock ............. 4-5Progammable Divider ................. 4-5Analog-to-Digital Converter ............. 4-5

Power Supply .......................4-6

Model 483 DigiCorder Service Manual i

CONTENTS (cont�d)

C-R5 SEl’TlNGUPTHERECORDERIntroduction. . . . . . . . . . . . . . . . . . . . . . . . . . 5-lSetup Procedures . . . . . . . . . . . . . . . . . . . . . . . 5-1Setting the Clock and Calendar . . . . . . . . . . . . . . . 5-3

Set Time-of-Day . . . . . . . . . . . . . . . . . . . . . 5-3Set the Date . . . . . . . . . . . . . . . . . . . . . . . 5-4

CHAPTER6 ALARMS ANDERRORMESSAGES . . .CHAPTER 7 TNKING CARE OF THE RECORDERI n t r o d u c t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - lCleaning the Recorder . . . . . . . . . ._ . . . . . . . . . . 7-lBattery Management . . . . . . . . . . . . . . . . . . . . . 7-lReplacing the Lithium Battery. . . . . . . . . . _ . . . . . 7-2Parts ListDrawings

ii Model 483 DigiCorder Service Manual

Chapter 1 - GENERAL DESCRIPTION

INTRODUCTION

This manual contains information for servicing the Del Mar Avionics Model433 DigiCorde# SSFP’ Holter Recorder.

For complete information for using the Recorder to record patient ECG, referto the User’s Guide AVPUB 93-18.

EOUIPMENT DESCRIPTION

The Model 433 DigiCorder is a compact, lightweight, 3-channel Holter Re-corder intended to continuously record the ECG of an ambulatory patient forup to 24 hours.

The DigiCorder records the ECGsignal digitally on either a min-iature hard disk drive or a ‘flashmemory card.

After the recorder is returned tothe medical facility the recordeddigital ECG is transferred to thehard disk drive of the Del MarAvionics Holter Analysis System(scanner). The recorded ECGmay also be transfmd to opticalstorage for long-term storage andlater analysis.

Mode/ 483 DigiCorder

NOTEThe DigiCorder utilizes proprietary data-storage methods that predudeHalter analysis on other than Del Mar Avionics Halter Analysis Systems(scanners).

The Recorder is available in either of two models. The Recorder Catalog NO.26170 is powered by one standard disposable g-volt alkaline battery. Theunit has slots for up to three such batteries to accommodate other types ofmemory media and future added capabilities.

The Recorder Catalog No. 26170-503 is powered by a special rechargeablebattery pack furnished with the Recorder.

Service Manual l - l

General Description Model 483 DigiCorder

Recorder features include:

l A patient identification number may be entered directly into theRecorder memory. This number permanently links the ECG recordingwith the correct patient and eliminates the need to enter that infor-mation at the scanner. More comprehensive patient information, entered

at the Del Mar scaxmer, may be written into the Recorder prior torecording.

l An LCD display shows operating status and error messages, aids inentry of patient information and time-of- day, and prompts the operatorin setting-up the Recorder.

l With the press of a button the patient may mark, in the ECG recording,significant events such as symptoms or activities. These event markerspermit the scanner to correlate segments of ECG with events writtenby the patient in the Patient Diary.

l A Setup program permits the user to select certain operating anddisplay characteristics to suit preference or circumstances includingselection of display language (English, French, German, Spanish, orItalian).

The Recorder is furnished with the following:

l Carrying pouch and shoulder strap.l Patient cable.l Set of ECG leads.l One g-volt battery or optional Del Mar rechargeable power pack,

depending on model ordered.

SPECIFICATIONS

Table l-l lists primary functional specifications for the DigiCorder.

Table l-l. Specifications

Catalog No.

with disposable batteries

with rechargeable battery

Recording Method

Memory Module

Hard disk

Flash Memory

Recording Period

26170

2617WiO3

Digital, microprocessor-controlled, 1 &it CPU, 8 Mhz.

Removable, PCMCIA types ll,lll.

105 MByte or greater.

40 MByte or greater.

24 hours typical.

cont�d...J

1-2 Service Manual

Model 483 DigiCorder General Description

Table l-l. Specifications, cont�d

Input Signal

Channels

Frequenq Response

Input Amplitude

Input Impedance

Common-mode Rejection

Sample Rate

Resolution

Input Connector

Accuracy

User Interface

Audio Alarm

Time Code

Pushbuttons

Test Connector

Analog Output

Power Supply

Disposable

Rechargeable

Internal computer backup

Mechanical

Dimensions

Weight

Environment

Temperature, Operating

Temperature, Storage

Relative Humidity

Three ECG, differential input.

0.05 Hz to 50 Hz at 128 samples per second.

k2.5 mV max normal mode, a5.0 mV half-gain mode.

10 megohm minimum at 10 Hz.

80 dB minimum at SO/60 Hz.

Analog to digital 128 samples per second.

Eight bits equal to 20 microvolts per bit.

Seven-pin, three differential pairs plus reference ground.

Precalibrated 22%.

LCD display, 2-line, 16-character alphanumeric. Displayspatient information, instructions, messages, and date andtime of day.

Beeper controlled by internal computer advises user of lowbattery voltage or recording failure.

Time of day and date

For Recorder setup and initialization, and for patient eventmarker.

Miniature RS-232 connector

Three-channel ECG, 1 mV.

One standard 9V alkaline battery. Up to three batteriesmay be installed for accommodate other storage mediaor future added capabilities.

6V Nickel metal hydride battery pack.

Three-volt Lithium battery.

4.00 x 4.68 x 1.94 in. (10.2 x 11.9 x 4.9 cm).

11.75 oz (333 gm) with one 9volt battery and disk drive,16.6 oz with optional rechargeable battery.

ooc to +50X.

-20°C to +6O�C.

10% to 90% noncondensing.

Service Manual 13

Chanter 2 PREPARING THE RECORDER

INTRODUCTION

A number of operating characteristics may be selected to suit preferences orC!iR!mhef3 - for example, you may choose one of four languages fordisplay. These ‘set-up’ characteristics will, in many cases, be selected onlyon the first use of the Recorder and will remain unchanged within the usingfacility. Setup procedures are outlined in Chapter 5 of this manual.

This section outlines procedures that must be performed prior to each useof the Recorder. Procedures are:

Transfer patient information from the scanner to the D&&order mem-ory device or enter directly into Recorder.

InstaIl the memory device in the Recorder. The memory device sup-plied with the Recorder has been especially prepared for the appli-cation. Any other compatible device must be prepared following pro-cedures outlined in Preparing a Memory Device in this section.

Install standard battery or Del Mar battery pack.

Perform initialization procedures including adjustment of channelgain, if necessary, and entry of a patient identification number if thatnumber has not been transferred from the scanner.

TRANSFERRING PATIENT INFORMATION

To transfer patient information into the memory device prior to recordingECG, proceed as follows:

1.

2.

3.

4.

5.

6.

7.

Remove memory device from the Recorder, pressing the top edge ofthe Recorder’s f+ont panel assembly away .from the Recorder body.It will hinge downward to reveal the memory device.

Grasp tab at the end of the memory device firmly and pull outwardsto disengage device from its connector.

Plug the device into the docking module in the scanner tower,pressing it firmly into the docking module socket.

At the scanner’s Data Base screen, press Fl key to display the ReportList.

Click on NEW PT INFO button or press F2 key to display thePatient Information screen.

Enter required information on the Patient Information screen, thenpress ESC key and then Y key to restore the Report List.

With the patient entry highlighted on the Report List, click onOFTIONS button or press FS key to display the Options menu.

Service Mawal 2-l

Preparing the Recorder Model 483 DigiCorder

8. At the Options menu, click on Prepare SSR Data. Patient infor-mation is copied to the memory device.

9. Press the release button on the docking module, then remove thememory device and replace it in the Recorder. Be sure that thisF&corder is the one installed on the identified patient.

INSTALLING THE MEMORY DEVICE

BNOTEYou must install the hard diik drive or flash card in the Recorder beforeinstalling the battery. If the battery is installed first, ECG will not berecorded.

The hard disk drive or flash card (figure 2-1) is removed from the Recorderin order to transfer its contents to the scanner’s hard disk drive. Because thedrive or card may not have been reinstalled in the Recorder, check as follows:

1. Press the upper edge of the Recorder’s front panel away from theF&order body. It will swing downwards to reveal the battery compart-ment and the memory device or the slot into which it must beinstalled.

2. If the memory device isnot in the Recorder,slip the disk drive orflash card completelyinto the slot, label sideup, pressing firmly tobe sure the connectoris seated.

3 . If the Recorder uses 9-volt disposable batter-ies, proceed with stepsoutlined in InstallingBatteries.

4 . Close the Recorder’s front panel assembly until it snaps into place.

INSTALLING BAlTERlES OR BAlTERY PACK

Your Recorder uses one disposable g-volt alkaline battery, or the Del Marrechargeable battery pack, depending on the model ordered. Either powersource, if installed fresh or recharged, will provide power for a full 24-hourHolter recording.

2-2 Service Manual

Model 483 Digiccrder Preparing the Recorder

BNOTEYou must install the hard disk drive or flash card in the recorder beforeinstalling the battery. If the battery is installed first, ECG will not berecorded.

Installing Batteries

The Recorder, with the memory device presently supplied, requires one freshg-volt alkaline battery. Either the Duracell@ battery P/N MN1604 or theEveread@’ battery P/N 522 is recommended. Do not attempt to use eitherlow-cost zinc-carbon batteries or mercury batteries. Use of unsuitable bat-teries can result in incomplete recordings or damage to the recorder.

The memory media supplied at the present time requires only a single 9Valkaline battery. Other types and models of media, or use of other thanalkaline batteries, may require a greater number. The DigiCorder holds upto three batteries.

N O T E

Alkaline batteries are not rechargeable. Do not attempt to recharge dis-posable batteries.

Install batteries as follows (see figure 2-2):

1.

2.

3.

4.

5.

Figure 2-2. Installing BatteriesPress the top edge ofthe Recorder’s front :$panel assembly away

from the Recorder~,~, .n,,,,,,,nr.,;... . . . . . . . . . . . . . . . . . . . . . . .: �.~:~:~�:~l,,;~i::,

body. It will swing:.:. .:.:.:.:.,.:.:.:::i:�:.: :.;ii.�;:iii;i;::l:;

.f.�..:�.:::::::.downwards to revealthe battery compart-ment.

Hold the white gatelatch to the right torelease the batterygate.

Swing-out the gatekm $e right-hand side to permit access to the battery compart-ment.

Insert one fresh battery in any battery slot, observing polarity asindicated at the &ont of the battery compartment.

Swing the gate over the battery compartment, pressing down theright-hand end until it snaps into the latch.

Service Manual 2-3

Preparing the Recorder kxlel483 DigCorder

6. Close the Recorder’s &ont panel assembly until it snaps into place.The Recorder is now ready for setup and operation.

To remove batteries, reverse installation procedures. Dispose of used batter-ies so that they will not be mistaken for fresh batteries.

Installing the Rechargeable Battery Pack

The rechargeable Del Mar battery pack is installed in the recess on the topof the Recorder. Install the fully recharged battery pack as follows:

1. Position the battery pack so that the name DEL MAR is orientedthe same as lettering on the surface below it.

2 While squeezing-together the release levers, press the battery packinto the recess so that a click is heard as it is locked into place. Pressboth ends of the battery pack to be sure that it is locked at both ends.

To remove the battery pack, proceed as follows:

1. Press the top edge of the Recorder’s front panel assembly away fromthe Recorder body. It will hinge downward to reveal two opposedlocking levers.

2 Holding the Recorder upside down with one hand ready to grasp thereleased battery pack, press together the two levers. The batterypack should drop into your hand.

3. Place the battery pack in the recharger (refer to Rechalging theBattery Pack).

Automatic Self-Test

After batteries, or the battery pack, have beeninstalled, the F&corder automatically performs abrief self-test sequence. During self test the dis-play briefly indicates the model number and soft-ware revision (figure 2-3).

As self-test terminates, the display indicateseither that the test was successfully completed,or displays an error message (refer to Error Mes-sages>.

If the self-test was successfully completed, pressMODE button to display the first item on themenu for Recorder initialization. This item per-mits acknowledgement or entry of a patient-iden-tification number. Refer to Initializing theRecorder for procedures.

I

or

Figure 2-3. Self-test Displays

I ID = 01234567890MODE TO ACCEPT I

L

If self-test results in an error message, refer to Chapter 6 for information.

24 Service Manual

Model 483 Dislicorcjer Preparing the Recorder

INITIALIZING THE RECORDER

Enter Patient Identification

MY

.

.

.

one or two steps are required to initialize the recorder:

Enter the patient-identification (ID) number, or confirm (accept) thedisplayed ID number.

Check to see that the correct date and time-of-day are displayed. Ifdate and time-of-day are not correct, or are not displayed, refer toChapter 5, Setting-up the Recwder for set-up procedures.

If the level of the monitored ECG is too high (refer to Chapter 3, ThePatient Hookup), change ECG gain.

The following paragraphs outline steps for performing each of these procedures.

A recording cannot be recorded unless a patient-identification (ID) numberhas been entered into the Recorder.

An ID number may be entered directly, or patient information may be firstentered into the Del Mar Holter Analysis System (scanner), and thentransferred into the DigiCorder’s memory device (refer to TransferringPatient Information on page 2-l for procedures).

Indirect entry from the scanner has the advantage of ensuring correctpatient identification.

After the MODE button is pressed following successful self-test, the displayindicates either of two messages:

l If patient information was not transferred km thescanner to the recording medium prior torecording, the display presents a field into which

II

you must enter a patient ID number of up to 11 characters. Refer toEntering Patient ID Directly for procedures.

l If patient information was previously transferred&om the scanner to the memory medium, thedisplay presents the patient ID code for

-1

confirmation. Refer to Confirming the Patient ID Number forprocedures.

Entering Patient ID Directly

The self-test cycle ended with the display presenting anentry field. Enter any number of from one to 11 numeralsas follows:

1. Press the ADV button repeatedly until the desired first (left-most)numeral (0 through -) appears.

!3ervice Manual 2-5

Prefxuina the Reader Model 483 DiaiCorder

2

3,

4.

5.

6.

Press SELECT button to advance the cursor to the next digitposition. (Note that if you press the SELECT button after the 1 lthdigit has been entered, the cursor will return to the left-most posi-tion.)

F+ess the ADV button repeatedly until desired next numeral ap-pears

Repeat steps 2 and 3. until final numeral is displayed.

Press MODE button to save the ID number and present the displayfor setting the time-of-day.

If time-of-day is correct, press MODE button to check the date. Ifdate is correct, press MODE button to present the ECG GAIN CHANGEd i s p l a y .

If either time-of-day or date is incorrect or not displayed, refer toappropriate procedures in Chapter 5, Setting-up the Recorder.

Note that the MODE button cycles through all initialization steps. If youwish to edit the ID number before starting recording, press the MODEbutton repeatedly until the display again presents the ID entry field.

Confirming the Patient ID NumberThe self-test cycle ended with the display showing thepatient ID number transferred into the memory mediumprior to recording.

If the ID number is correct:

1. Press MODE button to exit and present the display for setting thetime-of-day.

2. If time-of-day is correct, press MODE button to check the date. Ifdate is correct, press MODE button to present the ECG GAIN CHANGEdisplay.

If either time-of-day or date is incorrect or not displayed, refer toappropriate procedures in Chapter 5, Setting-up the Recorder.

If the displayed ID number is not the correct number for this recording:

1. F%ess either the SELECT or ADV button to display the patient IDentry field.

2 Enter the correct ID number and then verify time-of-day and datefollowing steps outlined in Entering Patient ID Directly.

Note that, if you have inadvertently pressed the SELECT or ADV button,you may restore the ID number. Just remove and replace the battery andcycle through prior steps (MODE button) until the ID number is againdisplayed.

2-6 Service Manual

Model 483 Digica&r Preparing the Fkorder

Set ECG Gain

The ECG GAIN CHANGE disphy appears when you exit theDATE display. ECG gain automatically defaults to FULL -that is, to the F&order’s higher gain setting. If examina-tion of the patient’s ECG (using the hookup to be used for the Holterrecording) shows any amplitude in any channel greater than 5 mV peak-to-peak, you must change the ECG gain for that channel to l/2.

If ECG amplitude is in the normal range (less than 5 mV peak-to-peak), youdo not need to change ECG gain. In this case, press the MODE button toexit the ECG GAIN CHANGE display and present the READY TO RECORD display(refer to Starting the J?.cz!ora?er in Chapter 3 of this manual).

If ECG amplitude is excessive, reduce gain as follows:

1.

2

3.

4.

5.

6.

F!ress SELECT button to present the display forChannel 1.

Press ADV button to move the arrow to the rightof l/2. Note that pressing the ADV button asecond time will return the arrow to the defaultposition at FULL.

If Channel 2 is in the normal range, press MODE button to view theREADY TO RECORD display. To change Channel 2 gain, press SELECTbutton, then perform preceding steps 1. and 2. for Channel 2.

If Channel 3 is in the normal range, pressMODE button to view the READY TO RECORDdisplay. To change Channel 3 gain, press SE-

- 1

LECT button, then perform preceding steps 1. and 2. for Channel3. This ends initialization procedures.

If you need to perform setup procedures (refer to Chapter 5), pressthe MODE button.

If setup procedures are not required, and if patient preparationprocedures outlined in Chapter’3 have been completed, press SE-LECT button to start recording.

The display briefly indicates that calibration pulses are being re-corded, then time-of-day is continually updated during ECG record-ing.

Note that time-of-day may be expressed in either 12-hour time (asshown) or in international 24-hour time, depending on set-up proce-dures.

After the Holter test has ended, refer to Chapter 4, When theRecoiling is Completed, for turn-off and downloading procedures.

Service Manual 2-7

Preparing lhe Rem&r Model 483 DigiCorcler

PREPARING A MEMORY DEVICE

The Hard Disk Drive or Flash Card supplied by Del Mar with the DigiCorderhas been especially prepared for application in the DigiCorder. Any user-supplied memory device must be configured in accordance with the followingprocedures. Note that the term ‘disk’ in these procedures is used to refer toeither a hard disk drive or a flash card.

1. Plug the memory module into the PCMCIA docking module in thescanner.

2. At the DOS prompt, type E:, then press Enter. If the monitordisplays an E:\ prompt, skip to step 3. below.

If the monitor displays the message:

a. Type F, then press Enter. The monitor displays:

b.

c.

d.

Current drive is no longer valid>.

Type C:, then press Enter.

At the C:\ prompt, type FDISK, then press Enter.

In the resulting FDISK menu, select Select Drive, then pressEnter.

e.

f.

gok

Click on drive number 2, then press Enter.

Select Create DOS Partition, then press Enter.

Select Create Primary DOS Partition, then press Enter.

Select option to utilize entire disk space for Primary DOS Parti-tion, then press Enter.

.1. Press Esc key until DOS C:\ prompt is displayed.

Not ready reading drive E:Abort, Retry, Fail?

3. ‘Ijp FORMAT E: /tJ, then press Enter.

4. The monitor displays the question:Proceed with Format (Y/N)?

5. Type Y, then press Enter.

6. After formatting is completed, you are prompted to enter a ‘VolumeLabel’.

a. For a Hard Disk, type DM483HDXXXX, then press Enter.

b. For a Flash Card, type DM483FLXXXX, then press Enter.

NOTE

XXXX represents any four numerals 0 through 9. Del Mar recom-mends that memory devices be numbered from 0000 through succes-sive numbers to facilitate itheir identification .

28 Service Manual

Model 483 Digicorder Preparing the Recorder

7.

8.

9.

10.

11.

12.

13.

14.

At the DOS prompt, type E:, then press Enter to log the E: drive.

Type DIR, then press Enter. The monitor should display:File not found

Type SCANDISK, then press Enter. Follow SCANDISK promptsto check the entire disk for detects, then exit that utility to the DOSprompt.

Insert diskette P/N 26697 @ID SETUP S/W) into the A: drive.

Type AZ, then press Enter.

Type 4&3SETUF’, then press Enter. This executes a batch file t.ocreate necessary files on the E: drive.

At the DOS prompt, type DIR E:, then press Enter. The followingfiles should be listed:

563ECG. DATLANGUAGE.LNGSPANISH.LNGENGLlSH.LNGGERMAN.LNGFRENCHJNGlTALIAN.LNG

At the DOS prompt, type CHKDSK E:, then press Enter. If noerrors are reported, the memory device is ready to install in theDigiCorder.

Q

Service Manual 2-9

Chanter 3 THE PATIENT HOOKUP

INTRODUCTION

Steps in preparing the patient for the Holter test are:

1. Prepare selected electrode sites on the patient’s skin, then applyelectrodes to prepared sites.

2. Connect leads to the electrodes and to the patient cable, then testthe hookup.

3. Instruct the patient on how to use the Recorder and how to cooperatein obtaining a useful test.

4. Install the Recorder on the patient and start the recording.

This section contains information to determine whether or not a problem iscaused by improper hookup materials or configuration. Refer to the User’sGuide (AVPUB 93-18) for complete Patient hookup Information.

PERFORMING THE PATIENT HOOKUP

NOTEProper placement and application of electrodes is essential for a highqual-ity ECG recording. The technician must carefully follow instructions forelectrode placement and application and for testing the patient hookup.The tintian should use only leadwire sets furnished with the recorderand otherwise available from Del Mar Avionics, and defined in Table 3-1,or other leadwires designed to the DIN 42-802 standard.

The type of hookup used may be determined by the type and scope ofinformation desired from the Hoher test. Two different patient cables andsnap-lead sets are available from Del Mar for use with the DigiCorder. Table3-1 characterizes each type.

Table 3-2 defines patient cable/lead set combinations and compatible elec-trode positions illustrated in figures 3-l through 3-4. These figures definechannel, polarity, lead color, and electrode placement or location.

Service Manual 3-l

Table 3-l. Cable and Snap-Lead-Types

The Patient Hookup Model 483 DigiCorder

tial (�late potential�) analysis

tern. Three CM-V lead signals share a

Table 3-2. Cable/Snap-Lead Sets and Electrode Positions

H = Holter analysis LP = Latepotential analysis

UNIVERSAL TEST CABLE

Only a Del Mar Universal test cable (P/N 26628) should be used to test thepatient hookup. This cable is designed to interface the Recorder with an ECGmonitor. For complete instructions for testing the patient hookup, refer tothe Model 483 User’s Guide (AVPUB 93-18).

3-2 Service Manual

Modal 483 Diglcorder The Patient Hookup

Figure 3-l. Placement No. 1, Cable P/N 25459, 7-lead

Ch. 1CM-V5

Ch. 2

(-) White

(+) Red

(-) Black

Right manubrial border or the sternum.

Left anterior axillary line, 6th rib.

Left manubrial border of the sternum.CM-VI .

!

(+) Brown Two-centimeters right of the xiphoidI 1 process on rib marqin.

Place all electrodes directly over bone to reduce muscle artifact.

Service Manual 3 3

The Patient Hookup Model 483 DigCorder

Figure 3-2. Placement No. 2, Cable P/N 25459, 7-lead

This configuration provides two V leads consistent with typical two-channelHotter recordings, plus a modified Lead III on the third channel. Because thereference electrode is very dose to the shoulder, some artifact may be seen.Place all electrodes directly over bone to reduce muscle artifact.

3-4 Service Manual

Model 483 Digicorder The Patient Hookup

Figure 3-3. Placement No. 3, Cable P/N 2546 7, S-lead


!ihvioe Manual 3 5

The Patient Hookup Model 483 Digicorder

Figure 3-4. Placement No. 4, Cable P/N 25459, 7-lead


3-6 Service Manual

Chapter 4 TECHNICAL DESCRIPTION

GENERAL DESCRIPTION

The Model 433 DigiCorder, a three-channel Holter Recorder, amplifies anddigitizes ECG voltages &om electrodes on the body surface. The digital datais stored on a hard disk or on monolithic electronic memory (‘flash card’).

The digitized ECG data is stored continuously for up to 24 hours. At the rateof 128 samples per second, utilizing an &bit sample for each of threechannels of data, approximately 33 megabytes of storage are required. TheRecorder uses either a hard drive module of 105 megabytes, or a flash cardof 40 megabytes. These storage devices are removable, PCMCIA-standarddevices. When recording is completed, the memory device is removed fromthe recorder and plugged into a docking module in the Holter AnalyzerSystem. The ECG and other data are transferred to the analysis system foranalysis and report generation.

SYSTEM BLOCK DIAGRAM

The system block diagram, figure 4-1, shows the major functional blocks ofthe D&&order. Refer to that drawing to aid in understanding the followingparagraphs. This drawing is included, along with other drawings referredto in this chapter, at the end of this manual.

The signal conditioning amplifier on the Amplifier Assembly is connected tothe ECG electrodes on the patient. With Central Processor Unit (CPU)controlling bandwidth and gain, these signals go to the analog-to-digitalconverter on the CPU assembly. The sample rate of the programmable A/Dconverter is fixed, in the current software, at 128 samples per second.

The amplifier assembly contains its own power supply to convert the batteryvoltage to 52.5 volts to operate the analog circuits.

The CPU, with program information stored both in the BIOS EPROM andin files on the memory device, controls. DigiCorder operation. The staticmemory (RAM) on the CPU assembly stores up to 10 minutes of ECG beforeit is written to the memory device. RAM also stores parts of the operatingprograms copied from the removable memory device.

The Front Panel Assembly contains three push-button switches; SELECT,MODE and ADVANCE, which are used for Recorder preparation, setup andProgramming. During the recording period, pressing any one of theseswitches causes a patient event mark to be recorded. The LCD on thisassembly is used for user instructions during preparation, setup and pro-gramming. During the recording period the display shows time of day. Thebeeper provides audible feedback when buttons are pressed and for errorwarnings during self-tests.

!3efvice Manual 4-1

Technical Descxbtion Model 483 DiaiCorder

The Power Supply Assembly converts battery voltage to +5V for all digitalcircuits and to power the memory device.

Figure 4-2, the DigiCorder Interconnect diagram, shows the interconnectionof all signals and power between the PWA’s of the DigiCorder.

a

DICKORDER PWA�S

The following paragraphs describe the function of each printed wiringassembly (l?WA) in the DigiCorder.

Amplifier Assembly, PWA 26515

The block diagram, figure 4-3, illustrates circuits of either Channel 1 orChannel 3. Although the diagram shows circuits to detect and regenerate apacer pulse, this function is not implemented in the current product.

Circuits for Channel 2 are identical to those in the diagram except that pacerpulse circuits are omitted.

The schematic diagram for this assembly is figure 4-4. Figure 4-5 shows thePWA outline and component locations on the PWA.

The frequency control input from the CPU adjusts the bandwidth of allchannels simultaneously. The gain of each channel can be changed, indi-vidually, by the CPU.

Input AmplifierThis amplifier has a high impedance differential input and a single-endedoutput. One potentiometer adjusts gain between 9.7 and 11.5 to calibratethe overall gain of the channel to 1000. Another potentiometer adjustsCommon Mode Rejection to a maximum value. The minimum value is 80 dB.Input amplifiers are identical for all channels.

High Pass Filter, 0.05 HzThis filter removes the DC offset generated by the bioelectric electrodes onthe patient’s shin. This DC voltage is the result of a battery effect and canbe as high as 300 mV.

Programmable Low Pass FilterThe high-frequency response of this amplifier is program-controlled by theCPU. In the current version, the high-frequency response is set at 50 Hz.When higher sampling rates are used in later versions, the high-frequencylimit may be increased to 150 Hz or 500 Hz.

4-2 Service Manual

Model 483 Digicordef Technical Descxiptiin

Programmable Gain AmplifierThe gain of this amplifier is program-controlled by an output from the CPU.The ECG is monitored during patient hookup. If the ECG in any channelhas an amplitude near 5 mV peak-to-peak, the operator can reduce channelgain by one-half. The lower gain prevents high-amplitude ECG signalsencountered in some patients fiorn saturating the recording.

CPU Assembly, PWA 26528

Figure 4-6 is the block diagram for the CPU PWA, and figure 4-7 is theschematic diagram for this assembly. The assembly contains a microproces-sor, static and EPROM memory, a time-of-day and date clock, a program-mable divider, hardware to support a PCMCIA port for interface with a harddrive or flashcard, and address decoding and other support logic. The CPUassembly also contains the analog-to-digital converter to digitize the threechannels of ECG. Figure 4-8 shows the layout of components on the PWA.

Block DiagramAll the components in this block are interconnected by three main buses;the 16-bit data bus, the 20-bit address bus and a control bus. The micro-processor can send or receive data from all units on the bidirectional databus. The address bus contains the addresses generated by the microproces-sor. Information on this bus determines which units of the CPU board willreceive data from, or send data to the microprocessor.

This PWA is a complete computer that can execute stored programs. Whencomputer power is applied, the computer executes program code stored inthe EPROM, a read-only memory. This code initializes the CPU, performsself-test and puts the first display on the LCD. The EPROM also containssoftware routines for reading and writing to the memory device. Programcode can be copied from the memory device into static RAM (SRAM) and beexecuted to perform various operations.

The ECG data samples are also stored until approximately 10 minutes ofdata samples have been accumulated, at which time the hard disk is turnedon and the data samples are transferred to the hard disk. If flashcardmemory is used, lo-minute samples buffered in static RAM are written tothat medium.

MicroprocessorThe V35 microprocessor is a highly integrated 16-bit processor using aninstruction set almost identical to that of 8088- and 80X86-series processors.Some of the hardware functions integrated onto this microprocessor unit aretwo serial ports, a programmable DMA controller, a programmable interruptcontroller, a counter timer, a parallel port with a comparator and a time basecounter.

Service Manual 4-3

Technical Descridiun Model 483 DiaiCorder

The microprocessor has a sleep mode which is used to save power when theprocessor has completed current operations. It is revived from the sleep modewhen a new sample is available from the analog-to-digital converter, or bypushbutton operation. The serial RS-232 ports of the microprocessor areused only for test and setup at this time.

In the current product, the microprocessor’s RS-232 serial ports are usedonly for test and setup. These ports may be used in future upgrades toconnect to a printer, modem or fax.

The parallel port of the microprocessor interfaces with the three tint panelpushbuttons, the EEPRQM, and the amplifier board bandwidth and gaincontrols. The comparator port contains an analog-to-digital converter thatmonitors the auxiliary battery that powers the time-of-day and date clockon the CPU card.

Three main buses connect the microprocessor to the rest of the system: the20-bit address bus, the 16-bit data bus and the control bus. The control bushandles information such as memory read, memory write, lj’0 read, I;/0write, the interrupt signals, and NIM and Reset signals and others.

ROMThe read-only memory (ROM) contains program data to initialize the micro-processor, perform self-tests, control the LCD, respond to the &ont panelpushbuttons and read and write to the memory device In response to LCDprompts or pushbutton operation, programs are loaded into SRAM from thememory device and executed to perform many functions. In general, pro-grams are executed by a combination of program data in the ROM andprogram data copied from the memory device.

a

SRAMThe static random access memory, SRAM, contains program data copiedfrom the memory device using routines stored in the ROM, and storessamples of the ECG data digitized by the analog-to-digital converter. Thesesamples are accumulated for about 10 minutes (230K samples at 128samples per second for each of three channels), then the hard disk is spun-upand the samples are copied to it. This process continues while ECG data isrecorded.

‘I’he SRAM also provides temporarily storage of other information, includingpatient events, during recording. This data is transferred to hard disk forpermanent storage.

PCMCIA PortThis port interfaces with the memory device. The memory device is eithera PCMCIA Type III hard drive, 40 megabytes or larger, or a flash card of 40megabytes or larger. A flash card contains nonvolatile semiconductor RAM.

4-4 Service Manual

Modal 483 DigiCorcisr Technical Desuiptii

The PCMCIA standard defines the mechanical and electrical parameter ofthe interface.

All ECG data samples are stored on the memory device. At the completionof the test, the device is removed &om the recorder and plugged into aPCMCIA port on a Holter analyzer system. The ECG data samples aretransferred to the hard disk in the analyzer for analysis and report genera-tion.

Time of Day and Date ClockThe 32.763KHz crystal drives the clock. The clock connects to the micro-processor buses through which it can be set and read by the microprocessor.When the DigiCorder battery is removed, the clock is powered by the internalauxiliary battery. Once set, the clock keeps time and date until the auxiliarybattery is removed or exhausted. The auxiliary battery will last for morethan two years.

Programmable DividerThis divider counts down the 32.76%KHz crystal frequency to generaterequired clock frequencies under control of the microprocessor. One outputcauses the analog-to-digital converter to sample the ECG data. In thecurrent program, this rate is 128 samples per second. Future models willgenerate 256 samples per second for high resolution ECG data, and 1000samples per second to acquire ECG data for micropotential analysis. A widevariety of sample rates are possible for other applications.

Another output &om this divider provides the audio tones produced by thebeeper at various times during operation.

Analog-to-Digital ConverterThis is a 12-bit, four-channel, low-power analog-to-digital converter withbuilt-in sample-and-hold. Three channels serve the three ECG data chan-nels, and the fourth channel samples the main battery voltage.

The digital data output is connected to the &bit data bus through whichla-bit data is acquired by successive reads.

The conversion process begins with the clock signal from the programmablecounter. At the end of the conversion cycle, the end-of-conversion signal fromthe converter wakens the microprocessor from the sleep mode. The micro-processor then stores the data samples, checks to see if it is time to load datato the memory device, checks for the presence of patient events and doessome other housekeeping functions. It then resumes the sleep mode waitingfor the next end-of-conversion signal from the analog-to-digital converter.

Service Manual 4-5

Power Supply

The output of the g-volt battery typically varies from 9.4 volts (new), to 7.0volts at the end of a 24-hour monitoring period.

The DigiCorder contins two DC-to-DC power converters. One suppliesS-volt power to digital circuits, and the other supplies power to analogcircuits. The analog and digital supply circuits are mutually isolated exceptfor a common ground.

Most battery power is consumed by the digital circuits. The CPU clock andhard drive start-up, spin-up, and spin-down cycles produce some noise in the5-volt supply.

The digital circuit supply, located on the Power Supply PWA, regulates to4.85 volts with an efficiency of 90 percent.

The analog power supply, located on the Amplifier PWA, is protected bothmechanically and electrically to prevent damage from inadvertent reversalof battery polarity as the battery is installed.

Shown in figure 4-9, dual P-Channel MOSFETs (U2 and U3), in line withinput power, protect the converter circuit. The converter comprises thestep-down switching regulator Ul, P-channel MOSFET U4, N-channelMOSFET U5, diode CRl, 68qH inductor Ll, 220qF capacitor C5, andresistors Rl and R3 which determine the regulated voltage level (4.85’57 ).

Refer to Figure 4-10 for the component layout of the PWA.

4-6 Service Manual

Tectmical Descrbtion Model 483 Dic$order

Power Supply

The output of the 9-volt battery typically varies from 9.4 volts (new), to 7.0volts at the end of a 24-hour monitoring period.

The DigiCorder contains two DC-to-DC power converters. One supplies5-volt power to digital circuits, and the other supplies power to analogcircuits. The analog and digital supply circuits are mutually isolated exceptfor a common ground.

Most battery power is consumed by the digital circuits. The CPU clock andhard drive start-up, spin-up, and spin-down cycles produce some noise in the5-volt supply.

The digital circuit supply, located on the Power Supply PWA, regulates to4.85 volts with an efficiency of 90 percent.

The analog power supply, located on the Amplifier PWA, is protected bothmechanically and electrically to prevent damage &om inadvertent reversalof battery polarity as the battery is installed.

Shown in figure 4-9, dual P-Channel MOSFETs (U2 and U3), in line withinput power, protect the converter circuit. The converter comprises thestep-down switching regulator Ul, P-channel MOSFET U4, N-channelMOSFET U5, diode CRl, 68-FH inductor Ll, 220qF capacitor C5, andresistors Rl and R3 which determine the regulated voltage level (4.85V ).

Refer to Figure 4-10 for the component layout of the PWA.

aService Manual

4B Chapter 5 SETTING-UP THE RECORDER

INTRODUCTION

Certain display and operating characteristics programmed at the factorymay be changed to suit preferences or specific operating requirements. Mostof these characteristics remain unchanged, in most cases, within the usingorganization.

The internal clock and calendar depend on the internal backup battery. Onceset, time-of-day and date need not be set again for the life of that battery.When that battery is finally exhausted, failure of the clock and calendarindicate that the battery must be replaced. Refer to Chapter 7 for replace-ment procedures.

Setup procedures may include:

Set clock and calendar with date and time-of-day format, and currentdate and time of day.

Set audio beeper’ control On or Off.

Set Pacer recording control On or off (for future use -- OFF in thisversion, not effective for pacer analysis).

Select the display language (English, French, German, Spanish,Italian).

Select sample resolution (not effective in the present Recorder).

SETUP PROCEDURES

Setup procedures may be performed just prior to starting a recording, whenthe display states READY TO RECORD (refer to Chapter 2).

To begin setup procedures, press MODE button to pre-sent the RECORDER SETUP display.

1. At the RECORDER SETUP display, press SELECTbutton to present the DATE FORMAT display.

2 If you do not wish to change the date format,press MODE button to advance to the TIME FOR-MAT display. If you do wish to change the dateformat, press SELECT button to present theDate Format Selection display. The arrow pointsto the present format: that is, to the Month-Day-Year format, or the Day-Month-Year format.

3. Press ADV button to select the desired format.

Service Manual 5-l

Setting-up the Recorder Model 483 DigCorder

4.

5.

6.

7.

8.

9.

10.

11.

To exit the DATE FORMAT display and present theTIME FORMAT display, press the MODE button.

If you do not wish to change the time format (either 24-hour time orA&I/PM notation), press MODE button to exit to the BEEPER display.If you do wish to change the format, press SELECT button to displaythe Time Format Selection display. The arrowpoints to the present format: that is, to the24-hour format, or the Ah$PM format. Press -1

ADV button to select the desired format.

To exit the TIME FORMAT display and present the BEEPER display,press the MODE button.

The arrow points to the present beeper status (On or off). If you donot wish to change the status of the audio beeper, press MODEbutton to present the PACER display. If you dowish to change the beeper status, press the ADVbutton to move the arrow to the desired status.

To exit the BEEPER display and present the PACER display, press theMODE button.

The arrow points to the present pacer recording status (On or Off,fixed Off in this version of the Recorder). Press MODE button topresent the LANGUAGE display. In a subsequentversion, if you wish to change the pacer recordingstatus, you will press the ADV button to movethe arrow to the desired status.

If you do not wish to change the display language (English, French,German, Spanish, or Italian), press MODE but-ton to exit to the RESOLUTION display. If you wishto change the language, press SELECT button to -1

show the LANGUAGE display.

The display shows the presently selected language. Press ADVbutton to step through the possible languages.When the desired language is displayed, pressMODE button to exit to the RESOLUTION display.

If you do not wish to change data resolution,press MODE button to exit to the PATIENT IDINPUT display (refer to Chapter 2).

N O T E

Resolution in the present Recorder is fixed at 128 samples persecond. This resolution-selection function anticipates later modelsoffering higher sample rates and is inactive at this time. a

5-2 Service Manual

Model 483 Dlglcorder Setting-up the Recorder

12.

13.

14.

SETTING THE CLOCK AND CALENDAR

If you wish to change data resolution, pressSELECT button to present the RESOLUTION dis-

play.

The arrow points to the present resolution. PressADV button to step arrow to desired resolution.

Setup pmcedures are now complete except for setting the clock andcalendar (refer to Setting the CZock am! Calendar below).

Press MODE button to exit Setup and presentthe PATIENT ID INPUT display. Refer to Chapter 2 ofthis manual for subsequent procedures.

The clock and calendar are set within procedures outlined in Chapter 2,Preparing the Reader. Because the clock and calendar run continually,they need be set only on initial set-up or following a move from one geo-graphic time zone to another, or following replacement of the internalbackup battery.

When performing procedures outlined in Chapter 2, after either direct entryof the Patient ID number or confirmation of an existingPatient ID number, press the MODE button to presentthe TIME display.

Set Time-of-Day

Time may expressed either in 12-hour time (APCYPM) or in international24-hour time. The format is determined by selection in setup procedures.

If the TIME display shows the correct time of day, press MODE button to exitthe display and present the DATE display (refer to Set the Date)..

If the displayed time-of-day is not correct, press SELECT button. A newdisplay appears with a cursor below the first digit.

Set time-of-day as follows:

1. Select a time-of-day four or five minutes after the present time. Thisgives you an interval of time to perform steps 1. through 4.

2, The cursor rests at the first changeable digit. Press the ADV buttonrepeatedly until the desired numeral appears in that position.

3. Press SELECT button to advance the cursor to the next digitposition. If you press the SELECT button after the final digit hasbeen changed, the cursor will return to the leftmost position.

Service Manual 5-3

!Wting-llp the RecxNder Model 483 DigCorder

4. Press the ADV button repeatedly until the desired next numerala

appears.

5. Repeat steps 2 and 3. until the final numeral has been changed.

6. When the actual time matches the displayed time, press MODEbutton to exit the time-of-day display and present the DATE display(refer to Set the Date).

Set the Date

On exiting from the TIME-OF-DAY display, the DATE dis-play appears. Numerals may either precede the month,or follow the month. The format is selected in SetupProcedures.

If the displayed date is correct, press the MODE button to exit the DATEdisplay and present the ECG GAIN CHANGE display (refer to Set ECG Gain inChapter 2).

If the displayed date is not correct, press SELECT but-ton. A new display appears with a cursor below the firstchangeable character.

Set the date as follows:

1.

2

3.

4.

5.

The cursor rests at the first changeable character. Press the ADVbutton until the desired character appears in that position.

Press SELECT button to advance the cursor to the next characterposition (Note that if you press the SELECT button after the finalcharacter has been changed, the cursor will return to the left-mostposition.)

Press ADV button repeatedly until the desired character appears.

Repeat steps 2 and 3. until the last character has been changed.

When the correct date is displayed, press MODE button to exit theDATE display and present the ECG GAIN CHANGE display (refer to SetECG Gain in Chapter 2).

54 Service Manual

Chanter 6 ALARMS AND ERROR MESSAGES

Audio and visual alarms alert the user to conditions or events that mightcompromise a useful recording.

The beeper’ is normally heard when any of the three pushbuttons (ADV,SEILECT, or MODE) is pressed. This function, which offers sensory feed-back during setup and initialization procedures, may be turned off in setupprocedures (refer to Chapter 5 of this manual).

Two messages on the LCD display alert the user to low-battery problems:

l The message LOW BATT VOLTAGE is displayed and three short beeps’are heard if battery voltage is below the level that would insure a full24-hour recording. That message would appear, for example, if usedbatteries were installed. Remaining battery life might support a brieftest, or setup or initialization procedures.

l The message REPLACE BAlTERY will appear on the display and five shortbeeps’ are heard if battery voltage is below the level that would supportany reliable use of the Recorder.

Further releases of Recorder firmware m expected to provide additionalalarm and error information.

Service Manual 6-l

a Chapter 7 TAKING CARE OF THE RECORDER

INTRODUCTIONThe DigiCorder@ Recorder has no moving parts and requires no routinemaintenance other than cleaning prior to each use.

Clean the Recorder c88e and rechargeable battery, if applicable, using onlya clean soft cloth moistened with a mild disinfectant. Do not permit anycleaning fluid to flow within the Recorder case.

Clean electrode leads using a clean soft cloth moistened with a mild disin-fectant.

BAlTERY MANAGEMENT

Do not permit batteries to remain in the Recorder but remove them at theend of each test. Discard used disposable batteries as they are removed toprevent their inadvertent re-installation for another patient.

C A U T I O N

Old batteries may leak and cause serious damage to the recorder.

As a rechargeable battery is removed from the Recorder, immediately tagthe battery pack as discharged, then put it directly on a compatiblerecharger (for example, Ambico Model V-0917). A suitable recharger shouldbe found in stores selling Camcorders.

Recharge the battery in accordance with recommendations of the rechargermanufacturer. It is a. good idea to label rechargeable batteries as freshlycharged or uncharged.

Make sure that battery terminals are clean before installing the batteriesin the Recorder. Clean terminals by wiping with a clean cloth.

The internal Lithium battery will eventually be depleted. This will beindicated by failure of the Recorder to maintain time-of-day.

To replace the Lithium battery, perform the following steps:

1. Open front panel of the DigiCorder.

2. Remove the memory device from the DigiCorder.

Service Mawal 7-l

Taking Care of the Rewrh Model 483 l3giider

3.

4.

5.

6.

7.

8.

Supporting bottom side of the DigiCorder, place tip of right thumbinside the memory device bay, then gently apply pressure at posi-tions shown in the illustration. This will release the front latch ofthe case.

Insert tip of a small slot screwdriver into the gap between upper andlower sections of the case just behind the front latch, then slidescrewdriver tip towards the rear of the case. This will release therear latch of the case.

Carefully open the case as if the left side (nearest patient cableconnector) were hinged

Using a small tool such as a jeweler’s screwdriver, remove batteryfrom its holder. Do not pry screwdriver against the memory deviceslide rail.

Install new battery into battery holder, then close and snap caseedges together.

Reset clock and calendar (refer to page 5-3).

al

7-2 Service Manual

PARTS LIST

For the location of any part in the following lists, refer to the DigiCorderassembly drawing (figure 4-11) at the end of this manual.

483 PARTS LIST

26169 and 26169403 (Common Parts for both Systems)

ITEM QTY. P/N DESCRIPTION

17 1 2651518 1 2651824 1 265407 1 26505-39 1 26505-719 1 2652135 1 CR203242 1 PKM35-4A04s 1 2669246 1 266932 1 25532-1336 1 DMOS213 1 26507-S14 1 26507-747 2 2670238 6 MS3 5206-20239 2 MS3 5206-20640 8 MS35338-3941 2 MS5 1959-248 2 MS5 1959-8B

483 PARTS LIST

26169 Only (9 Volt System)

ITEM QTY. P/N

4,6 & 8 1 26617-7613 2 25532-1510 1 26505-911 1 2650615 1 2651230 1 265 54-332 1 266 19-3

Amplifier PWACPU PWAPatient Input PWAPanel, DoorCap, ConnectorPWA, Front PanelBattery, Lithium 3V, 12SmAHr.Alarm, PiezoPlug, Molded Test COM.

Label, Test OutputPin, Door, HingeLCDLabel, Logo 483Label, Buttons 483Post, KeyingScrew, Panhead, 2-56X. 19Screw, Panhead, 2-56X.44Washer, SILK - #2 CDScrew, Flathead, 2-56X. 19X82Screw, CSK, 82 Deg, #2-56X.625

DESCRIPTION

case, 483Pin, Door, HingeLocking cleatGatePWA, Power SupplyBattery Bay LabelLabel, System

cont�d...

Model 483 DigiCorder Sewice Manual

PARTS LIST (cont�d)

483 PARTS LIST (Cont.)

26169-503 Only (Rechargeable Battery System)

ITEM QTY. P/N DESCRIPTION

4,5 & 8 116 120 121 122 123 125 126 127 128 229 112 134 237 2

ACCESSORIES

26638 Hard Disk Assembly26639 Flash RAM Card26571 Battery Rechargeable25452-5 19 Snap Lead Set25459-505 Patient Cable Assembly, 7 lead24156 Shoulder Strap24244 Belt, Waist26632 Pouch26630 carrying case93-18 Operations Manual

TOOLS

21357-791 Device for Docking Module with Patient Data26697 HD Setup Software Diskette

26617-762 Case, 483 w/Rechargeable Batt.265 12-503 PWA_ Power Supply26538-3 Bracket, Lefi Grabba26538-5 Bra&t, Right Grabber26539-l Lever, Right Release26539-2 Lever, Let? Release26541-3 Spacer, Bottom26541-5 Spacer, Bottom26541-7 Spa=, Top26542-5 Contact, Rechargeable Batt.26562 Label, Battery Bay26619-5 L a b e l , s y s t e mCE63 Eye&z&.090 Brl X .093 LGEO94-013-1000 Spring, Extension

DRAWINGS

~~ 4-l::::::::::c.:.:.~ 4-2Y ..A...... .v..:;::::::::::::::::~~ 4-3::::::::::::::z::;. . . . . . . . . . . . . .~: 4-4:::::::*J)#,.A..~~ 4-5. . . . . . . . . . ..>..y:.Z+:.:.:.:...~~ 4-6. . . . . . . . . . . . ..i...:<::::::::::::::::~ 4-7. . . . ..A...........::::::::::;:s.z:;<<<:.:. y..:.~ 4-3. . .. . . . A.... . . . .y::::::::::::::::~ 4-g>?s$$$?:;~~ 4-10:::::::::::::::::::~~ 4_11

Model 483 DigiCorder@, Block Diagram

Interconnection Diagram

Amplifier Assembly, Block Diagram

Amplifier Assembly, Schematic Diagram

Amplifier Assembly, PWA Layout

CPU Assembly, Block Diagram

CPU Assembly, Schematic Diagram

CPU Assembly, PWA Layout

Power Supply Assembly, Schematic Diagram

Power Supply Assembly, PWA Layout

483 DigiCorder, Assembly DrawingModel

Model 483 DigiCorder Service Manual

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