Page 1

TechFest Reno 2020

SETEC MK5PFC-IIRepair Guide

Slot Tech TrainingNo previous electronics experience required

“It’s not difficult to fix power supplies and LCD monitors”

Do you have a shop stacked with monitors and power supplies that needto be fixed? Are you sending your items out for repair?

Are you looking for a quick and painless way to bring your slot techs up tospeed on monitor and power supply repair, down to the component level?

You don’t have to be a genius to fix power supplies and LCD monitors. Theclass assumes no previous knowledge of electronics. Class begins at 9:00am and typically ends at around 4:00 pm daily with an hour break for lunch atnoon.

The three-day class is $895.00 per person This includes all textbooks andclassroom materials. Each student receives their own digital multimeter andsoldering tools and supplies as well as samples of electronic components.Students will also build a component tester that will be a valuable tool fordiagnosing failures in the shop. With a minimum of eight students, trainingcan be held at your own property. Otherwise, you are invited to send your staffto any one of our Regional Slot Tech Training classes that we hold from timeto time at various locations across the country. Please consult the website atslot-techs.com for the course outline and our current schedule.

To book your training or for further information, contact:

Randy Fromm-PublisherSlot Tech Magazine401 W. Lexington Ave. #777El Cajon, CA 92020tel.619.838.7111fax.619.351.0410randyfromm@gmail.com

√√√√√ Learn to fix power supplies√√√√√ Learn to fix LCD monitors√√√√√ Fun class√√√√√ Lots of hands-on training√√√√√ No math or formulas√√√√√ Practical Knowledge

TechFest Reno 2020Peppermill Resort Hotel - March 31-April 2, 2020

How Much Can You Learn in Three Days?LCD Monitor Repair and More!TechFest is for slot techs of all skill levels, from novice techs who need thebasics to advanced techs that need to brush up on monitor repair.

Make plans today to join the gaming industry's top technical instructors forthree days of technical seminars and presentations that will enhance yourperformance as a technician and dramatically increase your value to youremployer.

TechFest tuition is $895.00 per person. This includes all classroom materialsand handouts. Meals and lodging are the responsibility of the attendees.

For an enrollment form visit the website at slot-techs.com

This is a technical presentation.The TechFest is geared for working slot techs and technical managers whoare looking for a way to make a dramatic improvement in their understandingof LCD monitors, Bill validators, Ticket printers and more.

Technical presentations from:Ceronix-LCD Monitor RepairJCM-UBA and iVIZION Bill Validators3M Touch Systems-TouchscreensFutureLogic-Ticket PrintersTransact Technologies-Epic Ticket PrintersCrane Payment Innovations-MEI Bill ValidatorSoldering Tips and "Hands-On" lab.

TechFest also includes instructions on LCD monitor repair and more, pre-sented by Randy Fromm, publisher of Slot Tech Magazine and your host forthe event.

For a schedule of events, visit the website at slot-techs.com

If you have further questions about TechFest, please call Slot Tech Magazineat 619.838.7111 or e-mail techfest@slot-techs.com

INCLUDES FREE DIGITAL MULTIMETERINCLUDES FREE Component Tester Kit#1 seminar for slot techs3 days of instruction6 of the casino industry's top technical instructors9 different technical presentations

Over 1847 slot techs have attended TechFest since 2001

Slot Tech Magazine 401 W. Lexington Ave. #777 El Cajon, CA 92022 619.838.7111

Slot Tech Featured Product

TOT2152EPC-V2 UltimateTouch Monitor For Gaming

LCD monitors are a mature technology. Aquick look at a modern slot floor and you cansee the 3D space filled with giant monitors,often curved now with Scientific Games’TwinStar J43 Video Slot Machine cabinet andits “J” curve monitor or Aristocrat’s Flamecabinet with its 55-inch “S” curve display andthe like.

But there’s still a lot to be said for “Normal”and that’s what the TOT2152EPC-V2 UltimateTouch Monitor For Gaming from ShenzhenTMD Technology Co., Ltd is. With greatspecs, a responsive (less than 10 milliseconds),projected-capacitance touchscreen that’s Plugand Play ready for action and a straightforward,modular design that makes it easy to service,the TOT2152EPC-V2 is an obviousreplacement choice for a reasonably-pricedmonitor that can be “dropped-in” when a flat,touchscreen monitor is required.

Naturally, the monitor features LED back-lighting. The LED Driver PCB is one of thefour, small printed-circuit boards you’ll findunder the back shield. The other boards are theA/D PCB (featuring both VGA and DVI inputs,

a nice LVDS connector and cable instead of acheap ribbon cable connection to the LCDpanel as well as through-hole, electrolyticcapacitors instead of SMD capacitors. This willmake future PCB servicing easier, shouldcapacitor replacement be necessary), the USB/RS-232 interface PCB, and the touchscreencontroller itself.

The unit features a 10 touch touchscreen. Thetouchscreen is built with Glass-Glassconstruction which uses a matrix of rows andcolumns of Indium Tin-Oxide (ITO) printed onsheets of glass. Voltage is applied in a commoncomputational scheme called “addressing.”When a conductive object, such as a finger,comes into contact with a PCT panel, it distortsthe local electrostatic field at that point. This ismeasurable as a change in capacitance. If afinger bridges the gap between two of the“tracks,” the charge field is interrupted anddetected by the controller. This system is ableto accurately track up to 10 simultaneoustouches.

Product Specifications

Drop-in replacement for SG Fusion Hybrid, SGFusion Auto Roulette, SG Fusion Virtual Multi-game and SG Table Master Fusion·1920x1080 Resolution 16.7M Colors LCDPanel With LED Backlight·DVI + VGA Input Video Source·DC-12V Input Voltage·P-CAP 10 Points maximum Touchscreen WithUSB and RS232 Interface·Touchscreen Supports Upgrade Firmware ViaRS232 and USB Interface·Certification CE, FCC, ROHS, etc.Product Dimension 575mm x 336mm x 52.5mmNet Weight 6kgPackage Dimension 670mm x 170mm x 440mmGross Weight 7.1kg

LCD DisplayNumber Of Pixels 1920 x 1080Panel Size 21.5"Active Area 476.0mm x 267.8mmPixels Pitch 0.24795mmDisplay Colors 16.7MAspect Ratio 16:9Contrast Ratio 1000:1

Brightness 250cd/cm2Back-Light is LED lighting bar type

Touch Points 10 Points maximumTouch Construction Glass-GlassViewing Angle Range H:170~178Deg.V:170~178Deg.

TouchScreenTouch Technology P-CAPTouch Sensor 52(X), 33(Y)Touch Cover Glass T=1.8mmInterface USB-B Female, RS232 DB9 FemaleLuminous Transmission e”85%Input Source FingerTouch Accuracy 2mm(Central), 2.5mm(Edge)Response Speed <10msSupports OS windows xp/7/8/10, Linux,Android, macOSHumidity Operating: 10%-80% RH,40°C

Manufacture ROHS, ISO9001:2008Technical Service customize protocol for USBand RS232 interfaceSupports Upgrade Firmware Via RS232 AndUSB Interface

CertificationElectricalCE,FCC,ROHS,etc.

Shenzhen TMDTechnology Co., LtdZiling He SalesDirectorMobile: +86-13787315277TEL: 86755-28890517Address: South Of 6/F, 2nd Building,Hualangjia IndustryPark, Fukeng,Guanlan, Longhua,Shenzhen, P.R.China518110.web:www.tmdtouch.com

(color schematic included at end ofdocument for reference)The Setec MK5 comes in two versions, thePFC1 and the PFC2. The PFC1 is outdatedand rarely used anymore so this documentwill attempt to cover some of theoperations of how the PFC2 power supplyworks based on my analysis. Not allquestions are answered and not allproblems are yet solved.

120/240 Volts AC IN:This power supply uses an external filterboard. I have found that for bench testingand repair, you can remove this part of theunit and connect a 120volt isolationtransformer directly to the bladeconnectors on the main board. They areright next to the fuse and labeled blue andbrown. Hot and neutral do not really matterwith proper use of a bench isolationtransformer and is required to perform anyservice/repair or bench testing in a safemanner.

ON-BOARD FILTER:A typical use of coils and small value capsare used to filter the power line. This filterworks along side the filter board to providethe best possible protection of the powerline. The power supply itself is generallynot affected by noise on the power line butit itself produces quite a lot of power noiseduring its operation, thus filters are usedbring that noise to ground level so as not toeffect other things plugged into this sameac outlet. This filtering is an FCCrequirement as well as a UL listingrequirement. Generally nothing goes wrong

in this area. The only exception might bethe 10 amp fuse sometimes blows if thereis a major board failure.

LOW POWER STARTUP MODE:Just after the filter stage is relay (k1) plus 1NTC power resistor plus one more 10 ohmpower resistor. At first power up, the ACline voltage passes thru both resistors andthat limits the maximum amount of currentthe power supply can use from the line.This is done to protect the fuse from an in-rush of high surge current that will bepreset during the charge up of the Vbulk(see boost converter). Once the powersupply is up and running in this lowerpower mode, the relay is energized whichby-passes the two resistors. This allows thepower supply to use the full amount ofcurrent it needs from the power line. Lowerpower start-up mode is enough to get theunit started and after safety checks aredone, then full power mode is engaged.This provides less heat and better powerefficiency. It also improves the reliabilityof the unit and its parts.

FULL WAVE BRIDGE AC to DC:The bridge is next marked as D1. This is atypical setup where the input AC voltage isconverted directly to DC before beingstepped down by a traditional transformer.Because line voltage is already high andgets directly converted to DC, it poses ahigh shock hazard. This DC is fed thru theboost converter circuit (purple shade onmy drawing) and finds its way to Vbulk(C52). Note that this cap will hold high

Setec MK5 PFC Version 2Reverse Engineering Part 1: By Carey Treesh

voltage even with the power line removed.It does have a bleed off however, so noneed to discharge it. Just wait about 40seconds before handling the board.

BOOST CONVERTERThe DC voltage from the full wave bridgepasses thru some diodes and a large coil(L5). At first the DC voltage charges up theVbulk to the peak voltage on the AC sinewave (about 170volts DC). This 170voltsfeeds a few places on the board. The boostconverter will boost this voltage to about400 volts DC when active. It does this byusing a high power mosfet (Q1 a ToshibaK2837). This mosfet when activecompletes a circuit to ground just after L5.During this “short circuit” all the DCvoltage and power flow into L5. Thiscauses a very strong magnetic field to buildup. This short is quickly removed, and nowthe field collapses, inducing its ownvoltage which is in series with the main DCvoltage, and they combine to make 400volts DC which is stored in Vbulk. Q1 iscontrolled by the main processor, a TexasInstruments UCC28513. Pin 12 of this chipis the driver signal for Q1. D35 and D5 areZener diodes which help to prevent toohigh a voltage signal on Q1. These can failand should be tested, especially if Q1Mosfet has shorted out.

Vcc POWER GENERATION:The parts in the light blue area of mydiagram are used to generate the primaryside’s chip voltage known as Vcc. It takesthe DC rail voltage from Vbulk as an input(170vdc to 400vdc) and converts it toabout 13.5 volts DC and this power rail(red) is used to power all the chips on theprimary side of the power supply.

U14 MAIN CONTROLLER CHIP: PFC

This is the main processor of the powersupply. Its main job is to generate two“gate signals.” The first gate signal is onpin 12 and is used to drive Q1 in the boostconverter. We call this side of the chipPFC, for power factor correction. Powerfactor is an electrical condition that robsefficiency from devices with coils ortransformers. Some of this loss can becompensated for by using our own coilsand careful timing of a driver signal in theboost converter. In order to get the timingjust right the chip needs to monitor a fewthings. Pin 3 in green connects to a seriesof dropping resistors in pink (R147 R134R133 R144 and R205). This voltagedivider takes the 170- or 400-volts dc anddrops it to a safe voltage the chip canhandle. Based on the exact voltage it reads,it will vary the pulse width modulation onQ1 in the boost converter to compensate inthe best possible way for power factorlosses. You may also notice pin 3 alsoconnects (in green) to pin 13 of chip U2. Iwill cover this later, it’s for safetyshutdowns.

U14 MAIN CONTROLLER CHIP : FWDThis side of the chip is used to generate thePWM signal at gate 2 on pin 10. Thissignal connects to Q5 (A Toshiba K2611).This transistor also quickly closes a circuitto ground thru the primary windings (twoof them) of transformer T1. The amount ofpulse width (how long this Q is on) isdetermined by the chip, and it makes thiscalculation based on a few input pins onthe FWD side (FWD means “forwardconverter” which is what this design iscalled). Two major signals are monitored.First on pin 8, the amount of current inamps is measured across R86 and passesthrough R185 to pad it down a little bit forthe input to the chip. This current is

generated when Q5 is active, and flowsthru it and R86 and also thru T1’s primarywindings. If the current measured gets toohigh, this will trigger an overload conditionand the chip will shut down the drivesignals to both Q1 and Q5 to prevent fireand damage to the board and its parts. Theother major monitor is on pin 7 known asVERR. This is the amount of error in drivedetected based on looking at the outputvoltage which should be exactly 24voltsDC. If this output voltage is low, then thechip needs to increase the pulse width. Ifits too high, it needs to decrease the pulsewidth. It gets this voltage monitor via U4,an opto-isolator connected to the 24-voltregulation parts shaded in yellow.

SAFETY SHUTDOWNS:The main chip has several signals that it’smonitoring, not only for the best possibleefficiency but also for safety issues thatmight come up if a part should fail. A fewof these monitors are located on theprimary side of the board (The AC inputside) and a few more are located on thesecondary side (the DC output side of theboard). Since galvanic isolation is requiredbetween both sides of the board, all of thesafety monitors on the secondary side mustsent to the chip via optic isolation. Thisincludes the voltage regulation feedback(U4) plus several others that all combineinto U5.

The U2 chip is a quad (4) operationalamplifier. Each of these four separate opamps can compare two input signals. Theidea is to compare a known good referencesignal to the one we are trying to monitor.If there is any difference, this segment ofthe op amp will output a positive ornegative voltage based on the difference involtages on its two inputs. The main

processor chip provides a reference voltageon pin 20 (yellow). This reference voltagecan only be provided to chips/segmentslocated on the primary side of the isolation.(See the gold line for division of primaryand secondary side of the board).

U2 Seg 1: This one is looking at the 170/400 volt rail, after it’s been dropped to asafe voltage signal by the resistors R49R33 R34 R48 and R32. This voltage iscompared to the reference voltage(yellow). The output on pin 2 of U4controls the brightness of the led in opto-isolator U6. The other side of U6 (on thesecondary side of the board—pointed to bythe brown arrow) receives this signal anduses it to control the drive voltage on thegate of Q9. The drain of Q9 (its output)connects to the “PF” line (orange) and Ibelieve its used as a “power fail” signal tothe slot machine telling it power is about todrop.

U2 Seg 2: This one uses the AC linevoltage, passed thru a series of drop downresistors on both hot and neutral (or hotand hot if 240vac) {dark purple wires}.These combine into one voltage, convertedto DC by D24 and this voltage is comparedto the reference voltage provide by themain controller chip (yellow). This istagged “AC OK.” This signal is fed to U2SEG 4. (this gets tricky) see seg 4.U2 Seg 3: This segment is comparing thesignal provide by opto-isolator U5 to the“AC OK” signal provided by Seg 2. Thisopto-isolator is a combined result of allfour segments in U3. The output of thissegment influences the input on the lastsegment, Seg 4. (which is also the “ACOK” signal). I know, sorry it gets worse.U2 SEG 4: From what I can tell, this is thefinal segment of safety monitoring for

many conditions at the same time. If any ofthe other segments fail their safety checks,then this Seg 4 will trigger the maincontroller chip via output pin 13, up the(green) wire to intersect with the VSensedropping resistors feeding pin 3 of themain chip. I assume the main chip willmake necessary adjustments to the PWMon the boost converter gate drive pin 12,but if the signal on this green wire from thelast safety op amp is too high (or maybelow) it will cause the main chip to shutdown completely.

MORE SAFTEY SHUTDOWNS ON U3The U3 chip lives on the secondary side,and as such can not take advantage of themain chip output of the reference voltage(yellow). As such, a new reference signalto compare to must be generated here onthe secondary side of the board since that’swhere U3 lives.U10 is small chip with Zener diodes thatprovide a fixed, highly accurate outputvoltage. In this case 5.0 volts is generatedand will be used as the reference signal forall four segments of U3.

U3 Seg 1: The 24volt output rail ischecked against the 5 volt reference. Theoutput is used to feed the gate of Q7. Q7trips state of the “OF” line (black dots).I’m not 100% sure what OF means, but Iassume it’s a power good signal (or maybea power bad signal) that is fed to the slotmachine. It’s a different signal then the PF(orange) signal tho.

U3 Seg 2: This segment monitors thevoltage drop across R122, a resistor thatchanges its value with temperature (Ithink). D27 isolates it from back feedingand causes only forward voltage from thisresistor to Seg 2. It is compared to the 5volt reference. The output is fed to U3 Seg3.

U3 Seg 3: This segment is just a pass thrufrom the last segment’s status. Seemsredundant, but perhaps it gains some“output power” making the Seg 2 signalstronger? In any case its output feedsdirectly to the U5 led. As far as I can tell,U3 Seg 3 is just used as an amplifier forthe over temp signal, and it’s itself is notchecking anything, only passing thru whatit already got.

U3 Seg 4: This segment seems to becomparing the main 24-volt output againstthe 5 volt reference. Its output signal isalso connected to the U5 led.U5 LED:Since all of U3’s safety shutdown monitorslive on the secondary side, all of themonitored signals for over-temp, and ACpower fail, and 24volt primary fail andeven 24volt aux fail feed into each otherand terminate at U5. I’m not 100% sure,but it’s a safe bet that U5 is pretty much a“go or no go” signal. That would mean theled must be on, or maybe off to allow thepower supply to run. In either case, this ledshines on the receiver part of U5 locatedback on the primary side just after the “acOK” check. In this manner all the safetychecks on the secondary side, as well as allthe checks on the primary side combinetogether as one big final “go or no go”signal that is output from U2 Seg 4, andfeeds into the same pin on the maincontroller as VSense (green wire).I think then, U2 seg 4 has the ultimatecontrol over safety shut downs as itcollects pass/fail status from all the othersafety monitor segments, and if any ofthem are a fail status, then Vsense getseither flooded with voltage forcing ashutdown, or is pulled to ground keeping itfrom seeing the voltage it wants to see,

also forcing a shut down. But I’m not100% sure which yet.

24 VOLTS DC OUT Rectification andRegulation:The secondary windings of T1 produce twoisolated, separate AC outputs. The mainoutput voltage is located right in front ofthe big yellow shade on the diagram. T1(pink box) is rectified by D30. C88 andC25 are the main filter caps for the main24v output. (C25 on the schematic islocated near U11) This DC output providespower to the regulator section in yellow.The regulator uses U9 to generate a fixed5.0 reference voltage. The voltage passesthru R92 into the led side of U4. The24volt rail provides the power to the otherside of the led. In this manner the led getstwo positives and no ground to completethe circuit. Current will flow from thehigher voltage (24) to the lower voltage(5). The amount of current depends on R92and the LED’s resistance as well. Theresult will be a certain amount of currentgiving off a certain about of light. Since the5 volt side is fixed at 5.0 volts and won’tvary, the 24 volt side will however varywith the amount of load put on it. But ifthat 24 volts drops, the amount of lightgiven off by the LED drops with it. Thisamount of light is collected at the U4receiver side and is converted to a VERRvoltage. This is fed to pin 7 of the mainchip. This way we can still have 100%galvanic isolation between input side andoutput side, yet still maintain perfectvoltage regulation.

24 DC OUT AUXAnother secondary of T1 located in thebottom left in pink box generates a 24-voltDC signal by first passing thru a set ofseries resistors and gets ½ wave rectified

by D26. The main filter is C20. This auxvoltage is only used to provide Vcc for U3.Since it is not regulated in any way, itmight be safe to assume voltage changeson this rail will cause the LED of U5 toalso change. If this is true, then U5 andthus U2 seg 3 and U2 seg 4 might play arole in voltage regulation for this auxpower rail, as well as trip the unit intoshutdown if any safety checks fail. This railis used only internally by the parts of thepower supply itself and is not provided asan output. Its also possible that no voltageregulation is required on this rail, since thechips probably will operate correctly evenif the voltage is not regulated. Not sure yet.U11 Q6 Q7 Q309 Mystery:This section is for some special purposethat I don’t fully understand what it’s therefor or what it’s trying to do. Q6 looks likepower switch of some sort that wouldallow power to flow from the main 24 voltrail into the Vcc of U11. The base of Q6(purple wire) comes from the externalconnector. I can only assume then that theslot machine activates this part of thepower supply. Assuming that’s true, U11can now get power. U11 is a dual op-ampwith 2 segments. Segment 1 is comparing avoltage that comes from the power rail thatgets activated by Q6 and checking itagainst a voltage at the drain of Q7. Theoutput of this is fed into the input of Seg 2and compared to a feedback voltage fromits own output (??!?!??!) also its outputfeeds the gate of Q7 (??!???!?!). The drainof Q7 also feeds out to pin 2 of connectorX8. I kinda feel like “Towely” from “SouthPark” trying to figure out this loop.The only conclusion I can give is thatconnector x12b1 pin 1 sends a signal intothis thing and an output signal is collected.These signals are voltage based and areprovided by and to the slot machine.

However, I don’t even see any connectorson this board with the markings “x9 orx11b” which are what these two wires arelabeled as? There is a wire from this area toX8 however. So this must have somethingto do with the X7 and X8 light connectors?If these signals are used to control power tothe light, I don’t see how?

Zero Crossing:On the filter board are some minorelectronic parts that monitor the power linefor when the 60 Hz AC sign wave crossesthe zero-voltage point and starts to gonegative. This is the ideal point to fire up anAC monitor (display) because heavyvoltage sag and current draw will be at thelowest possible point. I’m not sure if thispower supply is still used to provide 120/240 volts AC to power the monitor or not? Iwas told it used to run a CRT monitor?!Wow. I do see a small connector with a blueand white wire going from the main boardto the filter board. This connector is markedX11, and I assume its just to provide someVcc to run the electronics on the filterboard to monitor zero crossing, but I’m notsure.

Repair tips:Vbulk seems to a common fail point. Thiscauses dirty power which can cause majorproblems for all the parts on the board.Remove and test Vbulk for bad ESR. Oftentimes you wont even need to test it, as itwill have leaked out its guts already. CheckDiode D42, a snubber used on T1. If itsshorted, you will never get this thingrunning. Its OK to remove it while benchtesting. A new one should be put back inthough before returning it to service.Removing C125 makes it a simple job toremove and insert D42. Check U13 in theVcc section. Ohm it out in circuit, ignore

the shorts between the bottom left and rightpins, this is normal, all other values shouldbe over 20K ohms, if not replace it. CheckD43 for shorts. Check L10 for short/meltdown. It should read 10 ohms. CheckQ1 and Q5 for shorts. Replace if needed,don’t remove the heat sink, no need to. C25and C88 often need to be replaced. Andcheck the main processor chip for physicaldamage. Not seeing any, ohm it out with pin1 as a reference to all other pins onopposite side of chip. All values should beover 100K ohms. This is not a prefect test,but 90% success rate with it. I’m stillworking on a good procedure to locateother bad chips and test the parts aroundthose chips. If both Q1 and Q5 are shorted,I have not had much success fixing thisboard. I would assume that is because verysmall parts are damaged, or possibly otherchips then the main and Vcc generationchip. -STM

Book now for TechFest Reno 2020Educational and fun!

March 31-April 1, 2020

Slot Tech Magazine1944 Falmouth Dr.El Cajon, CA 92020 Postage