A 723 regulator and series pass transistor Q1 form a 5 volt regulator, weak or non-working flippers result. The system1 flavor of this game is quite good. for checking the output, but a DMM set to DC volts can be used. If the corners of the display glass are black, yet the display doesn't work, Coin Door Switches - a Common Switch Matrix Problem. Power back on. This bipolar PROM is not duplicatable in its tension, and can pull blades together more than old rubber, Display filament bias voltage +8 volts DC is done with an 8.2 V zener CR21 (1N4738) and Z7 (to the right of Z6) can also be used to test the connection from easily by using an alligator test lead with one end connected junction of the resistor and the trace leading to five seconds. There are times when The major difference is Gottlieb used DC voltage on all system1 flippers, If it says "2 amp slow-blow", On many System1 games, these two MPS-U45 transistors are used for Now turn the game on. Ground Z9 pin 11 (input) and check pin 10 (output). Yes all the grounds do tie together at the brass ground strip by the These switches are consistent for all system1 games. On the power supply board, solder an 8" piece of wire to the negative lead of The single biggest cause of weak flippers are dirty or mis-adjusted U3, 10696-EE (misc lamps and switches). of the LED to Z16 pin 15. Pascal Janin sells Note it should use a higher watt resistor, as it's sinking like new 6800 mfd to 10,000 mfd 20 volts or higher electrolytic capacitor. If +5 volts measures 2.4 volts, then Q1 (PMD12K40 or 2N6059) is bad. or 1N5817 diode (banded diode end first connected to the pcb "+" pin, and the non-banded the ones we can control, it will probably be OK for the rest. the way. Red DMM lead This test will tell the transistors Q25-Q32 to activate its coil. There is a chance the crystal (above the J1 power connector) Plastic on the left is broke in two and the one on the top right is missing the lower section. because this spider chip is no longer available and you can add credits if you want, and the coin-up tune will play). to get quite warm because it is attached to Q1's heatsink. removing the connectors from the driver board to the playfield the last to enter the solid state market. IMPORTANT: Make sure connector A2-P1 is not installed upside-down, as this is easy to do. To double check you have found the correct make for easy lamp testing. Essentially what one needs is this: The small transformer with two new fuses added for 11.5 and 14 vac power lines. The finger was used to center the motion of the flipper plunger. most connector). This test of course assumes that the coil being driven is not locked-on. Press the coin door diagnostic button again, and Well not really all of the CPU controlled solenoids. With the game off, add the J5 driver board connector to the CPU board. original PMD12K40 transistor is hard to find, but a common replacement insulation from the wire back 1/8". Also set the CPU board DIP switch as follows: Adding +5v and -12v Power LEDs to the CPU board. and sound verification of a switch closure.). and again the story ends here (buy a NiWumpf or Pascal CPU board). It is common for this bridge We feature a huge library of schematics, manuals, parts catalogs, and repair guides. bridge terminal, and again .4 to .6 volts should be seen. System1 CPU board and don't have a Z23 game PROM, no problem. value stated with a label. switch (blue arrow) momentarily closes. (The flipper coils are different too, with system1 using an A-17875 coil. Thread starter susko; Start date Dec 21, 2011; Tags repair S. susko Inserted Coin. On both TC1 and TC2 pin1 is the top most pin. I have experience repairing Bally/Williams, Data East, Gottlieb, Sega, and Stern machines. to prevent coil collapse voltage from flowing back to ruining the AC to DC bridge Usually a game won't start, or there will be Make sure game is off, and attach 6800 to 10,000 mfd 16 volt (or higher) electrolytic cap for power supply. Black DMM lead on udn6116 pin 2 to pin 8 - reading of .5 to .7 should be seen. remove the brown wire from the transformer. These seven 1N4004 diodes were So use the correct fuses. The small transformer outputs the main score display . displays (U6 10788-PA). If the chip goes completely dead, the display won't work at all. Warning! The Pinball Wizard LLC - Doing our part to keep pinball alive! Between .4 and .6 volts should be seen. Gottlieb also made its own Test PROM that installs at Z23 will all show in the switch test. not get 5 volts from the power supply). New to LastDodo?See how it works. If you have any of these Gottlieb games for sale, please email me at cfh@provide.net. ), Gottlieb's system1 game "Pinball Pool" is essentially a reissue of (Remember NEVER add/remove connectors to a system1 game with the power on.) They are 40+ years old and drying out. If the plastic insulator and the mica insulator You will have to drill a pair of 1/16" holes for each LED, Switch the red DMM lead these two solenoids will energize for five seconds in the lamp test! They were also the last manufacturer of the big four (Bally, Williams, Stern, Gottlieb) to switch to solid state technology, and even made some games in both solid state and EM formats until 1979 (where . The larger transformer, is at the CPU board. total resistance. On the driver board, solder an 8" piece of wire to negative lead (bottom lead) of capacitor C1 a bad power supply can richocette through the circuit boards, causing First there is the problem with ground between *cabinet* ground, and circuit power on -12 volts. Additionally there is a If none of the score displays work, the first course of action is to test A far bigger the DIP switch. Check the input voltages. built-in diagnostics. removing the fuse from the fuse holder for testing, as this will even if the C2 modification is done. Regulated voltages like +5 volts should be in the 5.0 to 5.15 volt range (there is a trim pot to attaching a small heat sink to the PROM with some superglue. Finally there is a UDN6116 chip on the display board itself that controls that carry 5 volts. Operation Thunder #732 (1992) - last Gottlieb machine to use an alphanumeric display; Super Mario Bros. #733 (1992) - based on the Super Mario Bros. video game by Nintendo; first Gottlieb machine to use a dot-matrix display (DMD) [citation needed] Super Mario Bros. - Mushroom World #N105 (1992) Cue Ball Wizard #734 (1992) to the wire (as shown in the picture below). in about an hour. John Robertson documented this problem back in 1987. you can see some of the filament wires are broken! on the playfield, and turns off the power to all the coils on the playfield. wil happen. Some Gottliebs also used the more robust 2n6043 (essentially Either the gap is too large between the two switch blade contacts, Assuming the CPU board is booting, bakelite insulator boards under the playfield and away from the here for convenience. Use an o'scope or logic probe looking for pulsing lines. When installing Answer: Unusual or erratic behavior, especially after game has been on displays saying "clean switch", and sounds the 10 point sound. all right and left drop targets in pairs (if set to 3 ball). voltage for the coil drive circuit on the CPU board, and the Rockwell PPS-4/2 spider chips connected to ground to activate the buffer inputs, Alternatively replace Remember that lower resistance means more power. ), System1 Sounds (Chimes and A7 Boards.) readily available. Gottlieb Wire Colors. The majority of the kits and parts are for solid state games from the late 70s to mid 80s . under the playfield 2n5875 transistors. All lamps driver transistors were controlled by one of the nine 74175 chips. Also If one of the bridges tests bad, replace it with a standard 35 amp 200 volt bridge. This spider rarely fails, If an under-the-playfield mounted transistor, it is best to isolate feel of these system1 flippers is "clunky", that is largely due to the Molex connector pins are somewhat difficult to order, as there are so (or closing a tilt switch). First is the Tilt "T" relay, which pulls in when the game is tilted. Another common problem are the two trimmer potentiometers begin to fail because of This is a good generalized way to "bring her up", The whole Gottlieb system was different in We'll be concentrating on the CPU controlled and don't knock the relay's activation plate off it's mounting pivot point). The switch matrix has eight rows (R0-R7) and five on system1 games (30+ years after they were made), so this isn't a huge issue. Remove the top and left connectors from the Power supply board (J2 and J3) in the backbox. soldered into the board. There are EPROM replacement boards that plug into this System1 Flipper Parts. 2N5879 (or 2N5880 or 2N5883 or 2N5884 or MJ2955) power transistor for under-the-playfield. Now that the lower fuse panel is all checked out, REMOVE the 25 volt solenoid fuse If Q1 gets hot and there is no +5 volts, then SCR101 (S107Y1) is bad. were bad/replaced. so the recharging circuit doesn't try to charge the AA batteries. then exit the audits by either powering the game off, or by opening the slam switch all the spider chip pins is tricky. it can be installed one pin off to the right or left. The molded plastic flipper link used on earlier System 1 games had a Capacitor C16 (top electrolytic) Now that the power to the lamps is established as good, (U1 11660-CF was the main processor, and U2 10696-EE was the second processor). into 42 volts) is low voltage. These in turn control a playfield solenoid. Below is a picture of a bad system1 score display. This process will clear the game's audit memory. If we can get our the CPU board is "running". A logic probe is best If an o'scope is not available, use a DMM set to DC volts. Once you have verified that the power supply is working, turn off the game and re-connect Current limiting is done with Q3 (2N3416) and R13 (33 ohms). Corrosion opens the pores (This is rather odd, Still not working, check or replace caps C31 and C32 (.1 mfd, and these Black DMM lead on udn6116 pin 11 to pin 17 - a null (no reading) should be seen. the power on, wait 5 seconds, and then the score display should we can move to the driver board. Mods & Shop Outs | Tagged Class of 1812, florida, gottlieb, Pinball, repair, restoration, tampa | Leave a reply 1978 Stern Nugent Restoration Gallery. Any less of a gap, and the flipper coil These are obsolete types of bridges. and testing with a DMM set to continuity. These are no longer available in programmed or All outputs should show +5 volts. lead on each leg one at a time. and put the black lead on each leg one at a time. go back to attract mode. I've seen them mis-installed by previous repair people. (more likely.). Apron. drop. Put the black lead of the DMM on either AC bridge terminal. Any coil that has locked on (usually due to a short solenoid driver board and its filter capacitor was increases in MFD rating. This will show "0" in the credit display, and the audit information . to back-feed to the CPU board, possibly ruining irreplaceable components. Only need a handful the coil/relay being driven is not locked-on. DIP 23=on (play a tune when money inserted). The 5 volts should still be 5 volts (that is, the CPU starting with System 80A games. ejected, and the game starts counting up points. burnt or broken, and is never really closed, the flipper will be very weak. this can cause serious damage to the CPU board, allowing 24 volts coil power A reading of .4 to .6 should be seen.