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Randy Fromm's

Slot Tech Magazine

EditorRandy Fromm

Technical WritersGlenn Allen, James Borg,Jason Czito, VicFortenbach, Henry Kollar,Chuck Lentine, KevinNoble, Pat Porath

Slot Tech Magazine is publishedmonthly bySlot Tech Magazine401 W. Lexington #777El Cajon, CA 92022tel.619.838.7111 fax.619.315.0410e-mail [email protected] the website at slot-techs.com

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Copyright 2014 under the UniversalCopyright Convention. All rights re-served.

Slot Tech Magazine

-EditorialPage 4-Aristocrat Topper Schematic Diagram, PCBLayout and Parts ListPage 8-MK7 UNI-400-1 Power Supply ICE2B265GPage 9-Regional Slot Tech TrainingPage 12-Slot Tech Training at Lode Star CasinoPage 14-IGT Communications Board Test FixturePage 20-HAKKO Induction Soldering UnitPage 22-Subscriptions

Randy Fromm

Publisher-Slot Tech Magazine

RegionalSlot Tech Classes

Shreveport, LAAugust 25-28, 2014

ArubaSeptember 22-25, 2014

Pinetop, AZOctober 21-24, 2014

Classes open to all slot techs

Slot Tech Magazine is anofficial publication of the

Dear Friends of Slot Tech Magazine,

As a follow-up to last month’s article on the old,Aristocrat topper, Glenn Allen has provided the datathat I was unable to publish at press time, namely aschematic diagram, board layout and parts list. Seepage four. Thanks, Glenn.

A recent poll on the Slot Tech Forum was over-whelmingly in favor of a series of articles on theIntegrated Circuits we use in gaming. Since we’vebeen covering Aristocrat power supplies lately, we’llstart with the ICE2B265G as used in the MK7 UNI-400-1 power supply. Turn to page eight.

Herschel Peeler has put together a nifty test fixturefor IGT Comm boards. It’s educational, even if younever build the thing. Turn to page 14.

See you at the casino.

August 2014Slot Tech Magazine

Slot Tech Feature Article

Aristocrat Topper Schematic Diagram,PCB Layout and Parts List

By Glenn Allen

R1 1K0 1/4WR2 470RR3 22KR4 732RR5 732RR6 732RR7 732RR8 243RR9 243RR10 243RR11 243RR12 0R13 0R14 0R15 0

C1 .1uf 50VC2 .1uf 100VC3 .1uf 100VC4 .1uf 100VC5 100uf 16VC6 1uf 50VC7 .01uf 50VC8 .1ufC9 470uf 35VC10 .1uf

D1 1N4001D2 1N4001D3 1N4001D4 1N4001

U1 NE555U2 CD4017U3 SN75451BU4 SN75451B

VR1 TO92MC78L05ACPVR2 TO220 LM317VR3 TO220 LM317VR4 TO220 LM317VR5 TO220 LM317

DS1 Red LED

F12A 250 FASTACTING FUSELED Chaser Parts List

Editor’s Note: This is afollowup to the AristoTopper repair article weran last month. Thanks,Glenn

Slot Tech MagazineJuly 2014


This is the LED chaser driver PCB

Notes:



The ICE2B265 isobsolete sotroubleshooting this

guy closely is important.DigiKey and Mouser list itbut do not carry stock,listing it as obsolete. Thereare some Chinesedistributors that still havestock.

This is the switchingregulator for the 24 Voltside of the power supply. Itonly has a few pins to lookat so troubleshooting isn’tdifficult.

The 2B265 comes in avariety of packages so if youare purchasing one, becareful of what you buy.

Pinout (DIP version)1 – Soft Start. It may justhave a capacitor to ground,100 nF is typical.2 – Feedback. This isusually an optoisolator fromthe output circuit thatmonitors the outputvoltage. As the outputvoltage goes up, this voltagegoes down. It should readabout 1.5 V DC with ameter but it is best read

MK7 UNI-400-1 Power SupplyICE2B265G

with a ‘scope to be a signalaround a 0.8 Volts level.3 – Current Sense. Sourcepin of the output MOSFET.This usually has a low valueresistor to ground, about 1Ohm is typical. DC voltagemeasured will be about 1Volt but not being a steadyDC, level readings maydiffer.4 – Drain output5 – Drain output. Theseshould be a high DCvoltage if you read it with ameter on DC. You may getsome reading with a meteron AC but unless you havea really good meter that canread AC at 66 KHz theactual reading may not bemeaningful. Best read witha scope. CAREFULLY.6 – (not used, may not evenbe on the chip)7 – Vcc. To start up, the2B265 this needs to beabove 13.5 Volts but oncestarted, it can be lower.Below eight volts it shoulddrop out. It willtolerate about20 Volts but atabout 16 Volts,it senses it as anovervoltage Vccand shuts downthe PWM.Typically readsaround 12 Volts.8 – Ground (ACline referenced)

There are two schematics.Design 191 is a simplifiedvariation of the UNI-400 24Volt circuit for an exampleof the 2B265 at work.Design 192 shows a detailof the inputs and outputsfor troubleshootingpurposes.

Design 191Design 191Design 191Design 191Design 191SETEC has added a circuit(Q9 and D15). Apparentlythe Vcc overvoltage levelwasn’t low enough. WhenVcc gets to about 15 Volts,Q9 turns on pulling theSoftStart line high. Youshould not see a voltagehere higher than 5.6 Volts.We will cover that infollowing paragraphs.

Other than that, operationis right out of the datasheet for the ICE2B265.You can download that frommost data sheet sources.My favorite iswww.alldatasheet.com.

By Herschel Peeler


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Using a Digital MultimeterThe DMM is the single most importantpiece of test equipment you can use.

Electronic ComponentsAll of the individual components usedin gaming machines are introduced.Students learn how to test them forproper operation.

Day 2-Diodes, Transistors & OtherSemiconductorsHands-on Transistor Testing Lab

This part of the school takes a look atall of the different types of semiconduc-tors commonly seen in gaming ma-chines. We'll take a look at the opera-tion of each component, along with test-ing procedures to determine if the partis good or bad.

Day 3-Morning Session-SolderingGood soldering technique takes prac-tice but there are some tricks that canreally help speed things along. Duringthis segment, each student will be pro-vided with their own soldering suppliesand a fun project kit they will assemble.This equipment will be theirs to keep.

Day 3-Afternoon Session-Power Sup-plies (continues Thursday)This module covers all types of powersupplies, including linear power suppliesand the Switched-Mode Power Supply(SMPS) found in virtually everything ina modern casino.

Day 4-Afternoon Session-LCD Moni-tor RepairLCD Monitor repair is generally prettyeasy thanks to their modular design.This segment covers the theory of op-eration of LCD monitors. There will be apresentation on component-level repairtechniques, CCFL testing and replace-ment and using LED strips as back-lights.

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Cost of the ProgramTuition is $795/personIncludes:Digital MultimeterSoldering iron, tools and solderingsuppliesSample componentsSoldering Instruction KitTextbook

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Randy FrommSlot Tech Magazine401 W. Lexington Ave. #777El Cajon, CA 92022619.838.7111

You can fax a PO to 619.315.0410 andwe’ll invoice you. Be sure to include thestudent’s name.

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Vcc obtains its start upfrom the +400 Volt line.When it reachesapproximately 100 Volts,Vcc becomes high enoughfor the 2B265 to start up somost any good +400 linevoltage should get thiscircuit started. Once the2B265 is going, onesecondary of T3 providesVcc for the chip. The Drainoutput should startrunning at about 66 KHz.

The Current Sense line hasa low resistance to ground.Current flowing throughthis resistor indicates thelevel of current through theoutput. The UNI-400 hastwo resistors in parallel (2.2Ohm and 2.7 Ohm, givingabout 1.2 Ohms).

Feedback InputFeedback InputFeedback InputFeedback InputFeedback InputThis is usually the outputof an optoisolator whoseLED is monitoring the 24Volt line (or whateveroutput the power supplyhas). As the 24 V line goesup to 24 V, the LED startsconducting and the voltageat the Feedback inputdecreases. Again, thisvoltage changes duringoperation but with a DCmeter youshould see aboutone volt here.

SoftStartSoftStartSoftStartSoftStartSoftStartThis is normallyjust a capacitorto ground thatdelays power onby a little while.

Design 192Design 192Design 192Design 192Design 192The SoftStart line has aninternal resistor thatcharges up the capacitor onthe line. A 5.6 Volt Zeneron this line limits theVoltage so you should notsee more than 5.6 Volts onthis pin. As long as Vcc isbelow 15 Volts, Q9 shouldbe off and doing nothing toinfluence the circuit.If the voltage on this pin isalways low, C59 may be bador the 2B265 is bad. Aboutfive volts is typical as Iremember. On power up,when this voltage getsabove 4.0 Volts, the 2B265should start up. Above 5.3Volts indicates an error andthe 2B265 shuts down.Inside the 2B265 there is atransistor tied to this line topull it low on internalerrors. Over temp or othererrors pull this line low, so0 V here may indicate a bad2B265.

FeedbackFeedbackFeedbackFeedbackFeedbackThis should be a changingDC level riding on about a0.8 Volt level at 66 KHz,following the output of thepower supply. As theoutput voltage decreases,the phototransistordecreases conduction andthe result should be awider output pulse, raisingthe output voltage back up.If the output voltage is toolow the voltage on this pinmay rise above 4.8 Voltsand trigger an error,shutting down the 2B265so you should not see avoltage here higher than4.8 Volts.

Happy (and careful)troubleshooting. Thiscircuit can bite.

- Herschel Peeler - Herschel Peeler - Herschel Peeler - Herschel Peeler - Herschel [email protected]@[email protected]@[email protected]

Design 191Design 191Design 191Design 191Design 191


Design 192Design 192Design 192Design 192Design 192


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held July 15-18, 2014 atthe Lode Star Casino in Ft.Thompson, SD.

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This was my “normal,” four-day class that is geared forslot techs with no previouselectronics training orexperience. We cover all the

knowledge and skills re-quired for the vast majorityof the common repairs weface in the casino industry.Beginning with a “no-math”

Nolan Brave Heart Bull and RandyFromm. Is it weird to publish apicture of yourself in your ownmagazine? I suppose if it’s OKwith Oprah . . .

Below: I just had to try out the“panorama” setting on my newSamsung Galaxy phone. This isone of our “hands-on” labs.


look at basic electronics, students pro-gressed through the use of the digitalmultimeter and capacitor ESR meter totest all of the discrete components. Nextcame soldering. Students learned aboutcomponent removal and replacement andhad the opportunity to build a solderingpractice kit that used all of the compo-nents we just learned about. Next, it wason to power supplies and LCD monitors

where we took a look at how these unitsoperate and, more importantly, how theyfail and what to look for when performingrepairs. I demonstrated LED replacementsfor CCFL backlights.

If you are interested in sponsoring a classat your property, please contact RandyFromm to discuss your requirements.-----STMSTMSTMSTMSTM

August 2014Slot Tech MagazinePage 12











This is the four, five orsix channel CommBoard in the distribu-

tion box of 960 seriesgames, both Game Kingand S-2000. It comes inmany variations and partnumbers. This test fixturetests all of them I havefound so far. The board hasthe possibility of three orfour wired channels andone or two fiber optic chan-nels. The board can bepowered from any of threesources. The test fixturecovers all of them.

No single game uses all thepossibilities so testing theboard in one game will notnecessarily prove it willwork in another game. Thetest fixture and this proce-dure are also educational ifyou are vague on RS-232,RS-485, current loops orfiber optic systems.

PowerPowerPowerPowerPower

Older boards were poweredby AC from a transformer inthe distribution box thatput out about 15 Volts,center tapped, through a 3-pin connector. The nextgeneration was powered byfive Volts from a power

IGT Communications BoardTest Fixture

supply in the Distributionbox through a 2-pin powerconnector. Some morerecent designs have beenpowered by +13 Volts com-ing in over the 26-pin rib-bon cable. The test fixturehas all possibilities herecovered.

The Board in GeneralThe Board in GeneralThe Board in GeneralThe Board in GeneralThe Board in General

There are many variationsand part numbers for thisboard so schematics willvary, but we can see somesimilarities in designs. Thegame interface is +13 V andground digital signals soswitch inputs are simplyswitches from +13 Volt orground. 4504 Voltage LevelConverters change these to+5 and ground for the restof the circuitry.

The RS485 interface isusually an LTC491 orMAX491. The RS-232 inter-face chips provide their own+V and –V for the RS32line. The boards that runoff of AC have an on-boardregulator that drops therectified voltage (“+13 V”line on the board) down to+5 V.No parts on these boardsare proprietary. All partsare available over-the-counter.

ChannelsChannelsChannelsChannelsChannels

The 960-series games haveeight communication chan-nels (1 through 8). Up to sixof these come into theCommunications Board aschannels “a” through “h”.

By Herschel Peeler


ADVERTISEMENT - Power Supply RepairChannel “a” is usually primary SAS and isan RS-485 port with MODEM-type hand-shaking (DTR and DCD). In boards withtwo fiber optic ports, “a” is the second fiberoptic port. Channel “c” is an RS-232 portwith flow control (RTS and CTS). Channel“f” is an optional second RS-232 port notused on most boards. Channel “g” is theprogressive (current loop) port. Channel“h” is the standard fiber optic port. Eachwill be covered in more detail.

The game has a Communications Analyzerbuilt into the diagnostics that is very use-ful for troubleshooting. The best applica-tion of this requires a loopback on thechannel you are testing. This allows theoutput of that channel to talk to itselftesting all of the game circuitry. Theseloopbacks are required for the test fixture.

The Test FixtureThe Test FixtureThe Test FixtureThe Test FixtureThe Test Fixture

The test fixture is not complicated. It isbasically switches and lights that simulatethe game inputs and outputs through the26-pin ribbon cable.

Channel 1Channel 1Channel 1Channel 1Channel 1

Referred to as Channel “a” in the boardschematics, this is usually Channel 1 ofthe game and is primary SAS. This is anRS-485 port on most boards. On boardswith a second fiber optic port, this secondport is “a.” On the RS-485configuration, we haveDirection Control (DIR),Data (TxDa and RxDa) andMODEM Control (DTR andDCD). TxDa is TransmitData on Channel “a” whichis data coming from thegame MPU out to somesystem. This goes into theexternal system as itsRxDa. RxDa is Receive Dataon Channel “a” which isdata coming into the gamefrom some external system.This comes from the exter-nal system’s TxDa output.DTR is Data TerminalReady. This is a signal

generated by the MPU, telling an externalsystem it is on-line and ready for opera-tion. This eventually goes to the externalsystem as a DCD signal. DCD is DataCarrier Detected which means the exter-nal system is alive and on-line. This comesfrom the external system’s DTR output sotesting this channel requires a loopbackthat ties TxDa to RxDa and DTR to DCD,allowing the port to talk to itself. RS-485 isa differential signal standard so there is a“+” and a “-“ side to each signal. Setting aswitch sends the signal. The result comingback lights an LED. This is the 10-pinconnector, J81.











On some designs with asecond fiber optic port,Channel 1 may be thissecond fiber optic port.


Referred to as Channel “c”in the schematics, this isan RS-232 port with FlowControl, RTS and CTS.TxDc and RxDc are thetransmit and receive data.RTS is Request to Send.This output is telling theexternal system the gamehas information ready tosend. CTS is Clear to Send.This is a signal from theexternal system telling thegame it is okay to send theinformation. In a systemswitch there may only beone processor but manycommunication channels.Since the processor canonly talk to one channel ata time, it organizes itselfusing these RTS and CTS

handshaking signals. Thisis the 5-pin connector, J82.


Referred to as Channel “f”in the schematics, this isan optional second RS-232port. No handshaking sig-nals are provided. FlowControl is accomplished byASCII control codes (X-ONand X-OFF). Only a simpleloopback between TxDf andRxDf is required. This is a7-pin connector, J5, notfound on all boards.


Referred to as Channel “g”in the schematics, this isthe typical Progressiveoutput to older progressivesign systems. This is acurrent loop design. Theinputs and outputs areopto-isolated. Again ProgOut is simply tied to Prog In

but we also need to supplypower to the external aideof these circuits. This is the6-pin connector on theboard, J85.


Referred to as Channel “h,”we have TxDh and RxDh.This is typically connectedto the fiber optic Data Col-lection System, WAP ((WideArea Progressive), CVT orlocation safe system. Theloopback required is a shortsection of fiber optic cable.On many single fiber opticport designs there is asecond fiber optic outputthat echoes what is trans-mitted on the other chan-nel. Worth noting here,there is a jumper “E1” thatdisables transmitting onthe fiber optic channelwhile something is beingreceived. This jumper mustbe removed for the


loopback test. An LED on the board lightswhen data is being sent out the fiber opticport.

Some boards have no fiber optic connec-tors at all. The board LED still lights butthere is nowhere for the signal to go andno signal to be received.

Testing the BoardTesting the BoardTesting the BoardTesting the BoardTesting the Board

Connect the loopbacks as required for theboard. Connect the appropriate powerplug and the 26-pin ribbon cable. Poweron. The LED on the board should light.

RESETRESETRESETRESETRESET

The typical schematic of the board hasbeen broken down into sections to maketroubleshooting easier. Some parts com-mon to different sections are duplicated inthe schematics. Turning on RESET shouldturn off the board LED. The board has twosources for a Reset signal. There is theinput coming from the switch through theribbon cable and a “+13 V Failure” circuit.On some boards, a jumper is required toprovide this +13 V power to this circuit.

Consult the schematic for the specificboard you are working on. The circuitshown is only an example and may notapply to your specific board.

Channel 1 TestingChannel 1 TestingChannel 1 TestingChannel 1 TestingChannel 1 Testing

Enabling the DIR input enables both RS-485 interface chips and the RxDa LED











should follow the TxDaswitch. The DCD LEDshould follow the DTRswitch. Disabling DIRshould kill both LEDs. ThisRS485 port is designed todrive a long distance butmay only go to a cable inyour SAS system. Whateveris connected to channel 1in your casino goes here.This is set up in configuringyour comm channel SASmenu. This is usually pri-mary SAS but doesn’t al-ways have to be.


Channel 3 should be de-feated by reset. The RS232interface generates its own+V and –V for the RS232line. RxDc should followthe TxDc switch. The CTSLED should follow the RTSswitch. The +V and –V theinterface chip generatescan vary from six Volts to

nine Volts. This is onlyintended to drive a shortdistance. This is often Sec-ondary SAS if you use it.


IF USED, the RxDf LEDshould follow the TxDfswitch.


This is the old style pro-gressive sign output. Mostmodern systems use aserial port for the progres-sive and you may not evenuse this port. Being a cur-rent loop design, voltagereadings can be misleading.It is current flow thatcounts more than voltagelevel. The chip used ispopularly an ILD2, dualopto-isolator. On the trans-mit side, the cathode of theLED should be about +5 or+13 (which ever is used on

the anode, it varies withboard design) when off anddrop about 1.2 volts fromthat when on. With theloopback connected, theoutput of the opto-isolator,pin 6 should go to about0.6 volts when on (limitedby Emitter-Base junction ofthe transistor) and about1.5 V when off. When off,the output tries to go high.How high is limited by theLED on the receive side, sowe will not see a +13 V atthe output unless the ProgTx line is open.If functioning properly, theP Rx LED should follow theP Tx switch.


Remove the jumper in thefiber optic circuit (usuallyE1) for loopback testing, ifyou use it. Reset shoulddefeat Channel 8 operation,otherwise the RxDh LED


should follow the TxDhswitch. If no fiber opticjacks are used, the LEDshould still follow the TxDhswitch but the output goes

nowhere and there is noinput for the RxDh LED.

- Herschel Peeler - Herschel Peeler - Herschel Peeler - Herschel Peeler - Herschel [email protected]@[email protected]@[email protected]

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Attention Slot Manager!Four-Day Classes With Randy Fromm

-Power Supply Repair-LCD Monitor RepairNo previous electronics knowledge required. It’s easy andfun to fix casino electronics down to the component level.

Call Randy at 619.838.7111 to discuss your needs.










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Slot Tech Magazine is strictly technical. As such, the magazine's contents are not timecritical. The repair information and technical data contained in past issues is just as valid

today as it was the day it was published.

Additionally, current and future articles more-or-less assume that readers are already familiarwith what has been covered in past issues. This editorial policy assures that Slot TechMagazine's contributing writers are not limited to "writing down" to the level of a novicetechnician but are free to continue to produce the most comprehensive technical articles inthe gaming industry.

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“OK. You asked and I listened. My new tech class eliminates obsolete CRTmonitor repair and the associated monitor repair lab. In just four or five days,your slot techs can learn to repair Power Supplies, LCD Monitors, TicketPrinters, Bill Validators and more. It’s easy and it’s fun.“- Randy Fromm

“I can help you bring down thecost of casino electronics repairs”

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