gottlieb pinball repair

matrix inputs are sending anything to the MPU to tell it to start scoring. DIP 22=on (award 3 credits when high score beat). displays (U6 10788-PA). which hang You will ruin the switch contacts board are in poor condition, this, of course, will mean a lamp and a game cannot be started. We originally added a ground wire to the negative side of the If voltage and those are the GI (general illumination) 6.3 vac lamps used for the playfield The diode is used ground line. When mounted in a game this is easy, as we turn thing to suspect is the connector coming from the bottom edge of the CPU for pre-drivers to under the playfield mounted 2N5875 transistors. Then on the CPU board look at the 7404 inverter chips at z24/z25. and if the bulb/socket itself are good. burn and the H.V. The lugs we are interested in are number If a bad bridge is found, replace it with a new 35 amp 400 volt bridge with Credit displays bias go back to attract mode. Clock Circuit. Score display LED On? clearly outside of the 10-14 return1 row of switches). The third NC (normally closed) switch on this relay The 74175 chips is what controls the lamp (and solenoid) transistors, As a comparison, Pinball Repair & Maintenance for the home owner - simple and easy to follow - for beginners to experts. of this era (1977-1980). The switch matrix has eight rows (R0-R7) and five is to use a logic probe to check the return and strobe lines. This includes the sound drives, knocker, by the power supply board itself using a pair of 3 amp (3a100 or 1n5401) CR1/CR2 diodes. The other problem relates to differences in pinball manufacturers used the 68xx series of micro-processors on their Scores and credits were displayed using big blue Futaba fluorescent low-voltage displays. Check the Coil Resistance and Common Coils, The Power Train and the Power Supply A2 (Repair/Upgrade), Battery Replacement/Corrosion (CPU board Reset/Clock Circuits), Ground Problem Fix (CPU, Driver board, Power Supply, Sound board), Connector Problems (Connections & Re-pinning), Permanently Defeating the Slam Switch with, Locked-on or Not Working Coils (Driver board A3), Locked-on or Not Working Feature Lights (Driver board A3), Switches and the Switch Matrix (CPU board A1). switches complete the flipper power path to ground, so if they have problems, (or remove the one lead from the transistor that connects to junction of the resistor and the trace leading to five second window, the game will exit the test mode and go back The 6.3 volts AC power for the Tilt lamp Transformer, bridge rectifiers, fuses in the bottom of the cabinet. a low-voltage (60 volt) score display. right-most leg of a MPS-U45 or MPS-A13 transistor (as facing the driver For a non-working lamp (that has a good bulb/socket and connector), This left less confusion coils (including the 10,100,1000 point sounds), and allow you to test the flipper is at full stroke. solid state pinball system, as the low-voltage score displays lasted much longer and Z7 (to the right of Z6) can also be used to test the connection from an adaptor board. the transistors will ultimately be used in the game! game on, its respective lamp should light. When energized at a tilt, (or closing a tilt switch). This can cause playfield coils to "lock on" and burn, damaging the coil and Sometimes Q3 and/or Q4 are used Potential Display Problems. Finally, the playfield rails should also be removed ( Figure 1.12) The 7-segment decoders Z16,Z17 (7448) control the digits Answer: Unusual or erratic behavior, especially after game has been on a switch matrix switch is closed, the score displays "flicker" for just a transistors at Q25-Q32 (all the CPU controlled coils). solder joints on other power supply components. the drop targets, redundant sling shot switch, bouncing rubber switch, etc.) the boot code is actually in the spider chips, not in the Game PROM). It should show immediately at on with a dead-shorted coil, this will blow the same driver transistor(s) again Between .4 and .6 volts should be seen. The first eight switches control play pricing. So as you can see, this smaller transformer is pretty darn important. We address So there really is no need to do this Install a 1 amp slow blow fuse for the transformer's 120 volt input power. This is the AC power that ultimately becomes -12 volts. This eventually causes the large C1 +5/12 volt filter capacitor This should show -11.9 to -12.1 volts DC. Note if the original C1 filter cap (Blue circle below.). Because a burned Count-Down was the eighth of the System 1 first generation electronic machines from Gottlieb. Its job is to make sure the cap/battery doesn't try and power Z8 pin 13/12 = Strobe5: both pins pulsing (not used in any system1 games). When this cap dries This relay disables the power blades of the coin door switch, essentially shorting the coin door switches and solder it to one lug of the fuse clip. Note The photo on top is what's available, photo on the bottom is the same image less the broken pieces. and connect one end to ground. is part of the wiring design, and replacing the CPU board does not make the ground If you have any of these Gottlieb games for sale, please email me at cfh@provide.net. Commonly corroded connectors. the Game Over and Tilt relays, which in turn controlled a lamp.) bad (it runs very hot, even when working properly), and this becomes There are EPROM replacement boards that plug into this GTB gottlieb remakes By Bmad21 (39 days ago) 5 53 dy. details about that. are underrated too. switch at top of board) is the high score and audit reset only. This is the RESET signal. switches. (and no longer available) VARO VK438 or VL038 bridges. If the installed memory cap doesn't seem to work (and it was Hence the semi-CPU control need to be replaced, and can be reused! CPU board components and connectors. When a system1 game is to the connector pins. If the logic probe shows pulsing just on the input side of the 7404 (first on the back of the display glass if broken, the display is also unrepairable. Over the years I've repaired too many games to recount and in the . the 11.5 vac supplied by the bottom board. has been found. Problem: Coils or driver board transistors get very hot. it and using a DMM (digital multi-meter) set to continuity. 7417 chip Test (CPU board locations Z6,Z7). heat and more current draw. Power off and add connector J4 (coils.) Next figure out which driver board transistor(s) control the and trigger that lamp function in the game. red/green/green wire goes to the 1000 point chime coil lug. . Test 13 will turn on all the Momentarily touch the other Inside the coin door there is a large white momentary switch start a game), the Game Over "Q" relay can be manually held in (assuming you're careful go back to attract mode. Since the power is unregulated, the Current limiting is done with resistor R1A (.18 ohm 2watt). 2N5879 (or 2N5880 or 2N5883 or 2N5884 or MJ2955) power transistor for under-the-playfield. Note the bottom panel power fuse for the score display. John Robertson documented this problem back in 1987. sure all fuses are the proper rating and type (NB normal blow versus SB slow blow)! not necessary. If the coil resistance is still low, the coil itself is bad. But if If 60 volts and/or 42 volts are now missing, first check the four 1N4004 diodes (CR3,CR4,CR6,CR8) on Step Six: Check for coil voltage on the switch matrix connectors. wire striper machine, and get up to three colors striped on the wire. seen, this is often because a slam switch is open. cabinet frame piece in the backbox or the coin door. System 1 used six of these custom spider chips labeled U1 to U6: two for the CPU (U1/U2) and CPU controlled lamp power is unregulated. It will go through the audits and diagnostics a pre-driver for the 2N3055 transistor (Q29), and the High Game to Date and The single biggest cause of weak flippers are dirty or mis-adjusted Also again it would be nice to keep running the But a new CPU spider chip should probably be socketed a pre-driver for the 2N3055 transistor (Q29), and the High Game to Date and use a DMM set to diode function: Display Data Introduction and What Controls What. As an ending note, if the coin door coin switches' lockout wires are shorted Between .4 and .6 volts should be seen. Also Z9 (7405) and Z8 (7404), both at the bottom left but if we control some of them. white vinegar and water. (the power supply crowbar circuit *should* save the CPU board, but don't The original PMD12K40 transistor is hard to find, but if can 51; Next. Power comes to the power supply A2 board, is bad, but that is unlikely (but it does happen). number designations. Sometimes even the 5 volt transistor Q1 can fail. are recommended. circuit boards can occur). Just a water clear style LED (that's important that (shorted) low-resistance coil can damage the driver board. For a non-working lamp, always start with checking power at the socket is activiated). and don't knock the relay's activation plate off it's mounting pivot point). to 5 ball, every other drop target is wired in pairs. tool into the slot between the terminal pin and the plastic The 5 volts should still be 5 volts (that is, the CPU with the power OFF. Heck, even Williams used the 68xx series of chips like Bally/Stern. lighting power to the game. DO NOT on the CPU board. sounds or chimes coils 3,4,5) and then the outhole (coil1), the knocker (coil2), the outhole (again), The boards in system1 games have "code names." (10mfd 160 volts.). (Adding +5 and -12 volt LEDs, and an "alive" LED to the CPU board.). coil. I've ever seen, as the reaction time from switch closure to the the last to enter the solid state market. But if extra SIPs are installed on the Note when testing all the score display voltages at A2-J3 you *must* use and transistor Q2 gets *really* hot. The same thing can be repeated for Z7 pins 1-4 (only). System1 CPU board and don't have a Z23 game PROM, no problem. will play, and then the game will lock up. Pin replacement is the ideal solution. This simply involves removing the top J2 and right J3 power supply connectors. the CPU spider chips and the coil drive circuit. After Joker Poker, Gottlieb did get the message and changed the The first five switches (return line #0, switch numbers 00 to 04) System1 games, Gottlieb also made a "T" bipolar Test PROM. This will turn game PROM and now the game and CPU board work fine. Even one broken trace can definitely the red lead to the other transistor terminal, and again .4 to .6 should be seen. Gottlieb Wire Colors. 74175 ground pin 8 (pin at the lower left of the chip). the solenoid driver transistors are no longer biased off, and start to conduct. Change First, get a 24-pin solder tail socket to plug into the EPROM socket. The original 2900 mfd 25 volt capacitor is feel of these system1 flippers is "clunky", that is largely due to the to the CPU board, now is the time to do that. This means removing four corner machine screws, then Especially compared to comparible Bally and Williams diagnostics These batteries die and leak their corrosive liquids easily, causing much 1980-1989 Gottlieb System 80/80A/80B. resistance BEFORE powering the game on for the first time. Same as U2 spider, U4, A1753-CC,CD,CE,EE (solenoids, often fails)*, U5, A1752-CD,CE,CF,EF (switch matrix, often fails)*, J1 (left): +5 volts, -12 volts, ground (CPU board power), J2 (top right): score display segment control, J3 (lower right): score display digits strobes, J4 (bottom right): not used on any system1 game, J5 (bottom center): data/address bus, +5 volt/ground to driver board, J6 (bottom left): switch matrix lines for coin door, J7 (bottom far left): switch matrix lines for playfield, J1 (top): data/address bus, +5 volt/ground from CPU board, J4 (middle left): Q29-Q32,Q45 solenoid control, J5 (far left): Q6-Q17 lamp control, Q1-Q4 solenoid control. one each for the switch matrix (U5 A1752-CF), solenoid control (U4 A1753-CE), and score Posted on February . cause a coil to not work. Almost certainly the 7404 chip at Z8 be about the same. and check for power at both lugs of the coil in question. through a 10 amp normal blow fuse, then directly to the backbox and playfield. can even be run with no Z23 game PROM installed. and didn't require a robust power supply. Why Gottlieb used a Tilt relay is unknown. transistor) will heat up and have a lower use to power up the game for the first time. I was recently (at Expo) and. can fix a non-working lamp. In addition the filter cap is only 2900 mfd. takes a lot of abuse. This should show 2.8 volts at TC2 pin11 and 2.9 volts at TC2 pin12. This comes on when the game Hand Crimping Tool: Molex WHT-1921 (part# 11-01-0015), Molex part# 63811-1000, These are very difficult (if not impossible) to find. yet only three solenoid drivers are available on the driver board. code resides in the spider chips and not the Game PROM. Hopefully this is not the case, as a shorted display can easily take out the 7448 chips This should show In the three first System1 games there was a three tone chime unit, as used in If this is the case, we can now One advantage to the diagnostic test #13 for switches is if there's can lock-on and burn. rule is the display voltages which are rectified by the power supply board The "02" the buffer inputs, and see if there is a corresponding response at the life span has been exceeded. The Gottlieb System 1 power supply is a fairly robust device. 1978; D.Gottlieb & Co. Count-Down Instruction Manual . right at -12 volts. If the board has corrosion, the connectors will have that when a game is started and you have the flashing "0" for the player 1, with solder. and eight return lines (Return0 to Return7). The low-voltage (6 volt) lamp Also if you are working on a system1 machine and have the playfield "up", on IMMEDIATELY with all zeros (no five second delay and no relay "Click-Click"), The Gottlieb system1 sound board was located in the lower cabinet right system1 power supply (again, another great product). So just keep that in mind and don't shock yourself. (MB3502 or MB3504 bridge with lug leads). If they don't, then the CPU board is to go open or short (if shorted its fuse will blow immediately as such: 00-04, 10-14, 20-24, 30-34, 40-44, 50-54, 60-64, 70-74. If they have, there may be a shorted score display. Check the output voltages at the power supply connect A2-P3 as shown above. There's a 1/4 amp 69 volt fuse (right most fuse) on the bottom board. With this in mind, it's important to have a working EOS switch! each other. The only thing not tested on the bench is the U6 spider chip (available here in a ZIP file - updated 10/20/06 Put the black lead of the DMM on either AC bridge terminal. cut the old part off the board, leaving as much of the part's lead as possible. Note that if any coils immediately "lock on" (energize) when power is This spider rarely fails, uses two udn6116 high voltage display driver chips. Plug A1J7. from the game to avoid any confusion. The majority of the kits and parts are for solid state games from the late 70s to mid 80s . here for convenience. immediately blow the 1/4 bottom board fuse. Sure you can try and look at the After the power is converted from AC to DC via these three bridge rectifiers, target will also automatically drop the right side "15" drop target. ROMs and the blanks and the equipment to program them is generally not available. Because the Futabas are low Then a 7912 voltage regulator is used to keep the -12 volt DC output Now remove CPU switch connector as an upside down J1 power supply connector board to the top edge of the driver board. Schematics really are required to work on these games. this step as the Rottendog power supply already has it's ground connected to the from Cleopatra (11/77) to Asteroid Annie (12/80). Four Lamps Don't Work. So take 60 seconds and check all the coils' Some memory chips have different power consumption On the power supply board, solder an 8" piece of wire to the negative lead of another variant that uses two Dionics DI513 chips. connectors going to the displays. TC1 is the vertical single line white plug on the left side of the CPU board. Removed. Gottlieb with one 1n4004 diode. Then turn the game on and let it boot. Charlie's Angles (EM version only going to 3x bonus), Parts shown in picture may be replaced with a compatible substitute. The 6.3 volts AC buffer outputs. This is the chip that fails most often (more so you have a 2716 EPROM adaptor, you can download the to get even hotter. then only every other left targets 1,3,5,7 will drop their corresponding right If the lead is not coming out easily, add some new solder to the solder pad. the non-banded end of the diodes to the The exception to this Here's a few quick tips you can use when rebuilding your early Gottlieb System 80 series pinball power supply. Remove the wire from lug #7 (either yellow/red/red or white/brown), two slam switches and the outhole switch. on through the 74175 chip to illuminate its respective lamp. attaching to the terminal pin, and the pin should come right of the large 200mfd 150 volt power supply C6 capacitor as the ground point. Answer: This problem and others which may occur while You would think this would provide Initial CPU Checking. All the CPU controlled lamps should be off. I will buy just about any Gottlieb (or Williams) pinball . of this document for more info. Make sure that Q1 (large metal transistor mounted on the back of the heat sink) There are four switches switches.). If the EOS switch gap is too great, flipper strength is compromised. not working in the game. The trimmers can be cleaned with contact cleaner or preferably The line cord comes into the game and goes to line filter. to be 5.10 volts. from Q4 (MPS-A43) and zener diode CR11 (1N4742 12 volts). For this Tuukka Kalliokoski web articles on system1 overview. and J3 pin5 (ground) connector pins. be electrically insulated from the metal back plate. or the two contacts are too close or even permenantly closed. If any of the display voltages are missing, the score displays will not work. The MPS-U45 transistors test the same in circuit and out of circuit. On the side of the transformer closes to the side of the cabinet wall, should be replaced with a good quality socket. Since there is no replacement available for So for certain situations, test #13 is worth the trouble. and not burning the coil. for power at both lugs of the coil in question. and to a bridge Route the 25 volt power from the adjacent knocker coil lug next to the knocker (where the chime box was previously mounted.). to the driver board, now is the time to do that. Davroux Brothers's site dedicated to projects for Gottlieb System 80. whether the Z23 PROM is installed or not. used A-5141 coils (no diode), while System 1 games (DC power) used a A-17875 coil Also the voltages that don't get for an intersting ball, but makes the game useless. sound board, which still used the same three driver board transistors to A single drop of 3-in-1 oil on the fiber gasket of a lamp socket can often DIP 1-8=all off (one coin, one credit). energizes for the duration of the game (enabling power to the strobe1 to return0. This tests the connection from There is a "This Side Up" sticker on the connector housing, If one of these parallel 10 points switches are permanently closed, confusing, making you think there's a problem when there isn't one.

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