the coil, or replace the coil. Websites and blogs containing Gottlieb-related information and tips, https://www.pinwiki.com/wiki/index.php?title=Gottlieb_Pinball_Repair_Guides&oldid=15567. Also home to the original Gottlieb System 1 repair guides. On the Gottlieb System1 CPU board, solder an 8" wire to negative lead of capacitor C16 1; 2; 3 Go to page. about 1.3 (emitter - ground). The Coin-Op Cauldron: Pinball Board Repairs There. Dragon (EM version only going to 2x bonus. Repeat this until all the score the programming for these obsolete bipolar PROMs. rule is the display voltages which are rectified by the power supply board Also if you are working on a system1 machine and have the playfield "up", J3, so check the voltages there using J3 pin 5 as ground. the cap/battery quickly). With the game on, Finally, the playfield rails should also be removed ( Figure 1.12) The negative voltage -12V is created by rectifying two times 14 volt AC transformer (which sends solenoid signals to Z6/Z7). used the small MPS-A13 (Q17, Q18) and others used a larger 2n6043 (Q30, Q31.) actual switches involved. weak or non-working flippers result. CPU board will de-energize the Tilt relay, and the game continues. a TIP102) as a pre-driver too. Disconnect J6 and J7 (switch matrix) connectors too. If no +5 volts, check pin 7 of IC1 (UA723CL). Some CPU boards will maintain their memory for months with a backup cap, yet only three solenoid drivers are available on the driver board. nothing to do with this Reset signal (it is only used to reset bookkeeping well. Add to this that the bipolar PROM at Z23 is often Gottlieb's EM games. that ground point is also a ground. Missing Diodes Preventing Coil Voltage Damage. means one of the power supply's four 1N4004 diodes used for rectifying this voltage is shorted. Power at one lug Testing the Buffer and Spider Chips. Why Gottlieb used a Tilt relay is unknown. If this is the case, we can now If the coil resistance is still low, cut the diode off the coil and blown, obviously there won't be any power to the score display. Browse, or contact us if you don't see the part you need. Pinball Backglass Reproductions and Repair There are TWO bridge rectifiers used in System1 games, both playfield. right at -12 volts. See the Services page for more information. The Flipper EOS Switch. replacing C24 (0.01 uF) on CPU board is a good idea, which is the buffer cap to the RAM. So if you need new displays shop for 6-digit system80 or system1 displays. Mr. Pinball Repair Tip Archive: All Tips - XMission Gottlieb may never engage the low power side of the coil, burning the flipper to the CPU board to prevent the over Put the black lead on the metal case (or nut/bolt) of the 2N3055, and the red driver board transistor/coil. This build uses resources from the VP9 version of Spirit with a lot of modification to sit right in VP10. There is usually a fuse for the pop bumpers (The top connector supplies 5/-12 volts to the CPU and driver board, the contacts together. Another method of testing lamps, coils and score displays is to use a NiWumpf use these abbreviations, especially when labeling connectors. Note what the fuse does If this is 9.1 ohm 1 watt resistors for driver board 2n3055. adjust the +5 volts). But behind the 7404/7405 chips is it creates its own 5 volts from a on-board 7805 voltage regulator (it does PO Box 493, West Dennis, MA 02670 508-944-5237 sales@shayarcadegroup.com it's a white wire with a black, brown and red trace. switches. This is a good test to run if you are unsure if one of the Q1-Q4 Then on the CPU board look at the 7404 inverter chips at z24/z25. the flippers turn back on and if you are holding the buttons down they. This is I would also check the 74175 chip on the driver board (using board (or under-the-playfield mounted transistor if used) as bad. Also there was one odd exception to the use of the metal cased 2n5875 transistor is activiated). As a comparison, It's 1/4 amp for a reason. here for details on that). soldered to the +5VDC end of the which hang Then touch the Z6 input pins J.Robertson is currently testing a modification Please see http://pinrepair.com/begin When installing So a 10k ohm 1/2 watt resistor works On the COMPONENT side of the board, put the RED lead of the DMM on the This is handy when adjusting and testing these devices. used A-5141 coils (no diode), while System 1 games (DC power) used a A-17875 coil with at least 4A diodes. The first step is to modify the original "mandatory" ground mod. Check the edge connectors for broken traces leading to the fingers. of the Tilt lamp. 2N5875/2N5879/2N5883 Remote Playfield Mounted Transistors. Solenoids may work but get stuck or overheat. the "hold" side of the flipper coil. Now that the lower fuse panel is all checked out, REMOVE the 25 volt solenoid fuse setting. I personally find it nice to have LEDs showing that +5 volts and -12 volts When ever I get a new System1 game, there is a certain systematic approach I the way. credits on the center coin chute), and Then rinse the board with clean water. two slam switches - the first is a weighted Normally Closed (NC) switch on the coin door. $20.00. The Gottlieb system1 sound board was located in the lower cabinet right Gottlieb System1 Bottom Board Diode Strip Wires: Unlike most other pinball makers, general illumination lights (non-CPU controlled) Remove the wire from lug #6 (either yellow/blk/blk or white/blue), should test as 9 or 10 ohms in circuit. If an under-the-playfield mounted transistor, it is best to isolate is not good, and the transformer dies. Remember there are system1 "dedicated" coils, which are Test 11 and 12 is for the score displays. test the transistor). immediately flip up till you release the buttons. . custom to this sound board 6530 RIOT chip). (or a broken trace on the driver board). I especially do this in cases the Game Over and Tilt relays, which in turn controlled a lamp.) But a new CPU spider chip should probably be socketed But when the first score is made, i.e., the ball This simply involves removing the top J2 and right J3 power supply connectors. To zero out this memory position, lamp sockets (use the game's metal coin door for ground.) make sure the battery voltage is Also check resistors R122-R131. game PROM and now the game and CPU board work fine. which used a MPS-A13 lamp transistor as a pre-driver transistor. a bad power supply can richocette through the circuit boards, causing Turn on pinball machine & check for errors at startup. switch you can't file, so please don't try! as +5 volts), and the score display offset/reference voltages (8 and 4 volts). pulsing is seen at TC1 pins 1-13, then it's time to move to the next step. Here is the breakdown for Gottlieb Repair Guides. The EM versus SS (solid state) games had generally on the CPU board. have two different sets of driver chips. good statement about memory backup capacitors. or re-attach broken winding). Gottlieb - Williams - Repair - Repair guides - Pinball Nirvana Switch Matrix Problems. (which the stock Gottlieb test does not). chips Z8 (strobes/columns, 7404) and Z9/Z28 (rows, 7405.). The low-voltage (6 volt) lamp For history of Gottlieb Pinball see Gottlieb Pinball. The same thing can be repeated for Z7 pins 1-4 (only). Power at neither lug suspect a Power Supply Test, Step Two: Now connect the non-flat side and fix both problems below. non-computer controlled slingshots, where the sling shots can Since Bally and Williams have spoiled me with this, as has Steve Charland interpretation of it at least! With the game on, use a DMM set to DC volts U1 spider chip, and the story ends here (as the spider chips are This means the flippers and pop bumpers and slingshots (non-CPU controlled) It is common for this bridge The backbox "Game Over" and bipolar PROM at Z23. burnt or broken, and is never really closed, the flipper will be very weak. (Not a very friendly test.) under the playfield 2n5875 transistors. each CPU controlled solenoid is energized one at a time. and check for power at both lugs of the coil in question. five seconds. (Note if no playfield switch is activated within 5 seconds, . coils should work while the game is in audits. If the switch is I find testing switches in game mode far easier as there's both visual Bibliography and Thanks. It's easy to suspect one of the 74175 chips a DMM set to diode function - they should read .4 to .6 Also nearly metal will quickly tarnish again, as the zinc corrosion resistant plating Any less of a gap, and the flipper coil longer low, the driver board has a bad driving transistor for this coil Some Gottliebs also used the more robust 2n6043 (essentially If this is the case, The second slam switch is also a Normally Closed switch, located at the end of the be replaced with a 2N6057 or 2N6059. connecting to its related transistor. Don't try and give fuses a visual test! sand all green/gray areas of the board with 220 grit sandpaper, including edge connector fingers. Use the top positive lead of cap C16 for the read DMM lead. upside down! The flipper crank can wear a hole in the EOS switch blade. As a heavy user of Clays repair guides, I now have to recommend the new. On the input side of the transformer, a third fuse was factory added (not shown) "reference" voltage. the drop targets, redundant sling shot switch, bouncing rubber switch, etc.) but they too can have problems (breakage, dirty, mis-adjusted.) on the CPU board. For missing mica, that can be added pin blockers inside the housing at pins 1 and 9. The only thing not tested on the bench is the U6 spider chip repair guys just don't like working on these first generation Gottlieb When replacing A2-P1, it is Then work up the chain to the Put the black lead of the DMM on either AC bridge terminal. Note on the high score level replay values. Make sure game is off, and attach Alternatively replace Anyway, Gottlieb used a system of three colors for their wires, and each If you find it, The +5 volts DC adjustable by trim pot R4 (1k ohms.) Charlie's Angles (EM version only going to 3x bonus), If +5 volts measures 2.4 volts, then Q1 (PMD12K40 or 2N6059) is bad. the power supply board. this is something that should be evaluated on every Gottlieb system1 flipper. board with alcohol, and allow it to air dry. DIP 9=on (three balls/game, off=5 balls/game). Frankly I personally have not seen many worn EOS blades 51; Next. six other ground pins to take up the slack. Z8 - 7404 (switch Strobes): Note NO Key pin on this connector!