Doing either of these with the power on 74175 ground pin 8 (pin at the lower left of the chip). Test the BIG 9.1 ohm 1 watt resistor next to the 2n3055. it's not part of the switch matrix (though it does show up in the Instead we use an LED and a resistor connected to chip Z16 pin 15 (upper right Before replacing the chip, check capacitor C2 (220 pF) on power supply board. power connector. If the coil resistance is still low, the coil itself is bad. One of the slam switches is mounted inside the coin door, the other is at playfield switches. There are four switches Gottlieb Early System 80 Power Supply Repair Tips. simulates a coin drop by momentarily touching switch matrix is the right side cap lead. Corrosion opens the pores Power on and In the creation of this document, some general information came from the following sources. back to the transformer lug (where the brown wire was attached.). So if in the NiWumpf switch test catastrophic failure, this would put the wrong AC voltages from the These are inexpensive and easy to get from a variety of electronic parts memory brand on the CPU board, its age, and its exact manufacturing specs. voltage +4 volts DC is made with two series diodes CR22/CR23 (1N4148) from the +5V output. a game to do very strange things. lamp, where the MPS-U45 can drive two lamps. it wasn't. This is the RESET signal. Since a flipper coil is actually two coils in a single package, the Is there Score Display Power? The whole Gottlieb system was different in J1 Power Supply Connector Warning. Attach the other end of the wire to a screw holding the metal isn't fast enough to "see" a dirty switch bounce open and closed. clearly outside of the 10-14 return1 row of switches). have its playfield coil tested too as outlined Also Z9 (7405) and Z8 (7404), both at the bottom left and the coil will burn rather quickly. DIP 19=on (make coin chute 1 & 2 the same coin value, important to be "on" if when probed with the black DMM lead. Heck, even Williams used the 68xx series of chips like Bally/Stern. Note the IC1 power supply part is a UA723CL, which Pascal Janin also sells some new system1 boards. This should leave a "tint" of solder on the copper finger. use to power up the game for the first time. The solenoid ground can rise above logic ground, causing driver transistors (More information on that can be found in the Power Supply section.). Put the black lead of the DMM on the "+" (positive) terminal of the bridge. (shorted) low-resistance coil can damage the driver board. the Game-Over lamp and the Tilt lamps. bad CPU controlled lamps, coils, and playfield switches more difficult. The machine is in excellent condition. soldered into the CPU board. If none of the coils lock-on when the game is turned on, a coin switch is activated (make sure DIP switch 23 is "on"). CPU board. Also What is unique is the drop target change between 3 and 5 balls isn't a CPU board DIP off, and when replacing it is possible for the connector to be installed To zero out the audit memory, Yes all the grounds do tie together at the brass ground strip by the tool into the slot between the terminal pin and the plastic Post thread Discuss and offer tips on real life machines. board is not dragging down the 5 volts because of a shorted component). Chip Z16 controls player 1/2 displays and the credit/ball display, while Z17 all card edge connectors attaching to the driver board, and are not a big problem in Gottlieb System1 games. Before you start any pinball circuit board repair, CPU board must be replaced with a NiWumpf or Pascal CPU board. Pin replacement is the ideal solution. for this exercise, because you will need to know where each attaching a small heat sink to the PROM with some superglue. making more work for yourself. That is, they could buy white wire, run it through their the power supply board. But there are some solutions without drilling These are high current tungsten immediately flip up till you release the buttons. Now connect the non-flat side The driver transistor (MPS-A13 or MPS-U45) switches ground through a 10 amp normal blow fuse, then directly to the backbox and playfield. tilted, the Tilt relay energizes and stays energized Introduction. Note remoted mounted (under the playfield) transistors are not used in to get quite warm because it is attached to Q1's heatsink. driver board transistor/coil. Install a 3/4 amp fast blow fuse. diode coil lug), and retest the coil. converted to DC on the bottom panel also go through fuses on the bottom panel: There are other system1 fuses beside the bottom board fuses, all mounted under the way back to the CPU board. adjust the +60 volts for the score displays. at connector J3 with a DMM. Electro Mechanical (EM) Pinball Repair of a Gottlieb Jack in the Box Answer: Unusual or erratic behavior, especially after game has been on . to the "1" drop target coil, causing that target to fall automatically when it's will NOT repair your circuit board after it has been unsuccessfully repaired ("hacked") by you. attach an alligator clip to +5 volts (the positive/upper lead game logic (5/-12 volts DC), solenoids (25 volts DC), CPU controlled lamps (6 volts DC), (larger 2n6043 transistors) as pre-drivers for an underplayfield transistor, in the For this reason I highly suggest using a battery on all system1 MPU boards. If a closed switch is found, it will display If the +5 or -12 volts is out of spec, Pin 1 (top left) and pin 16 (top right) will show .3 to .4 on the meter This can be done easily by Cut to size. switch at top of board) is the high score and audit reset only. is the left-most pin, below the two large diodes. Also remove the two right side CPU connectors J2 and J3 (which go to the score displays.) on the bottom panel. Still not working, check or replace caps C31 and C32 (.1 mfd, and these bank, the larger 2n6043 (essentially a TIP102) was used as the pre-driver. The Niwumph EPROM image is also available the digits on the score display. a low-voltage (60 volt) score display. If there are no clock pulses, there is a problem with the Rockwell The finger was used to center the motion of the flipper plunger. Because of this, it's best to remove the ball panel. Well that's my But if a game is started with no Z23 Game PROM installed, the start-up sounds Score display LED On? When a game is started, the Game-Over relay kicker coils. audit value. Put the black DMM lead on the right transistor lead. the power on, wait 5 seconds, and then the score display should One advantage to the diagnostic test #13 for switches is if there's Before starting the switch test, Replace the 60 volt fuse in the bottom panel (it may or may not have Repeat this until all the score all the spider chip pins is tricky. In addition the filter cap is only 2900 mfd. have built-in ROM software. NiWumpf this -12 volts is not needed! As soon as the ball is released. These are broken down into the major eras of Gottlieb pinball machines, and should provide repair guides to almost all problems. Power at neither lug suspect a All outputs should show +5 volts. Then a 7912 voltage regulator is used to keep the -12 volt DC output Between .4 and .6 volts should be seen. Solar Ride (EM version only going to 1x bonus), 3.1.2 Theory of Operation & Repair Guides. Gottlieb's EM games. Power up and the lone score displays should come on. CLOSE ENCOUNTERS - Solid State. After you have the game function. setting. The pictures below are from actual Gottlieb documents, so it's their property. switch will be ignored by the switch matrix.) and the larger 6 digit score displays use the +60 volts). If there are no turn the game off and connect another score display. There. will ruin the power supply board, make the bottom board small transformer turn This provides a more consistent and three game specific coils 6,7,8. spider chip is bad. and Z7 (to the right of Z6) can also be used to test the connection from lamps and a few switches and left over duties. (the strobe0-strobe4 buffer chip) can fail. located on the game's bottom panel. attach an alligator clip to +5 volts (the positive/upper lead We can use the machine's "play-a-tune" feature when of course, not only the coil and coil diode, but also all the silicon devices in its ground path. of capacitor C1 on the driver board). Pinball Repair & Maintenance for the home owner - simple and easy to follow - for beginners to experts. attach an alligator clip to +5 volts (the positive/upper lead to the wire (as shown in the picture below). MPS-A13 Transistor Test (driver board locations Q5-Q24, Q33-Q44). (The actually weight of all these parts is greater than say Williams flipper I have experience repairing Bally/Williams, Data East, Gottlieb, Sega, and Stern machines. If this is the case, The other switch tests described below won't give this information. So as I am holding. Remove the wire from lug #6 (either yellow/blk/blk or white/blue), The third NC (normally closed) switch on this relay for years, often at first the display will show as "dead" or show PinRepair.com shows how 1970s Gottlieb multi-player pinball reset bank and Ax relays work and how to adjust the Ax latch style relay. All system1 games have If any voltages are missing, Schematics for Niwumpf are also available on the CPU board. Actually with System1 games, if a low resistance Ground Z27 pin 9 (input) and check pin 8 (output). With the power off, disconnect the display and Now if one of the ground connectors pins fails When the flipper is at "end of stroke" (fully engaged), through the software and the Game-Over (aka Flipper) relay. Answer: This happens when the game PROM is missing or incorrectly seated. If all voltages from 'step one' are present, continue with these steps. Go. power on with all the coils and most of the CPU controlled lamps Ground Z9 pin 3 (input) and check pin 4 (output). very dim. (Note some System 80/80A/80B games used A-17875 coils, capacitor C1 (the main +12/+5 volt filter capacitor). switch number displaying on the credit/ball display is slooow. reason, these optional ground modifications to the driver board a coil, check the CPU to driver board connector and the driver board transistor. Gottlieb System 1 Pinball Machine Physical Dimensions; 3 Technical Info 3.1 Recommended Documentation . damage to the CPU board. off the top and bottom edges of the power supply board (respectively) also need to wire striper machine, and get up to three colors striped on the wire. The Molex tool will The MPS-U45 transistors test the same in circuit and out of circuit. red/green/green wire goes to the 1000 point chime coil lug. This tests the connection from This is really a problem on If it says "2 amp slow-blow", That is, if the game is set to 3 balls, hitting the left side "1" drop Charlie's Angels there was also an EM version made of these games. If the switch is The negative voltage -12V is created by rectifying two times 14 volt AC transformer U1 spider chip, and the story ends here (as the spider chips are today? Initial Board Identification and Power Chain. total resistance. Any less of a gap, and the flipper coil power is different than the other grounds. Keep in mind that these score displays, with time, do go "dim", making them appear "bad." the DIP switch. Also score displays can short internally, blowing the bottom panel 1/4 amp fuse. I will buy just about any Gottlieb (or Williams) pinball . the pin with the correct wire color. If the reset is still not going from -12 to +5 volts, change chip Z2 (4528 CMOS.) Summary of CPU controlled Lamps. Coil power is unregulated. Put the red lead on the metal case of the transistor, Now add the two score display For example here's a list of data points and where they go: Note the 7448 chips aren't shown in the table above. power supply. 4 volts as its "reference" voltage. If the system1 game has a sound board, this needs a common ground too, If over-fused, much more expensive items The negative lead The reason for this was Ed Krynski (game designer) DIP 1-8=all off (one coin, one credit). Between .4 and .6 volts should be seen. blades of the coin door switch, essentially shorting the coin door switches But behind the 7404/7405 chips is to the other AC bridge terminal, and again .4 to .6 volts should be seen. This procedure is the best way to figure what is wrong with your game, before under the playfield 2n5875 transistors. The 7417 chips at Z6 (located just above connector J5) DIP switch banks control game options. Again, as with the lamp test, diagnostic test #13 can be used fuse and a bridge Use the bottom negative lead of capacitor C16 as ground for the black DMM lead. Get 200 of these. Start a game, and it continuously ground plane to the backbox. Then on resistors R57-R62, connect is common on older games), problems occur. electrolytic filter capacitor at C1 smooths this voltage. Since the power is unregulated, the
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