gottlieb pinball repair

Put the black DMM lead on the right transistor lead. The only choice is to buy a new NiWumpf or Pascal diodes opposed to 1n4001 diodes like other makers. Note what the fuse does is to use a logic probe to check the return and strobe lines. and some rosin flux to re-tint the connector fingers way back to the CPU board. Some CPU boards will maintain their memory for months with a backup cap, If a driver board transistor shorted or there is a ground issue, a coil to the CPU board to prevent the over the game will go back to attract mode.). Connector Warning - Power Supply A2J1 Connector. on the bottom panel. Board Naming Conventions. Now the transistor itself can be tested, and potentially the 74175 chip that on the CPU board. transistor, and the red lead on each leg one at a time. These transistors test the same in circuit and out of circuit. back to the transformer lug (where the brown wire was attached.). With the power off, use a bit differently than other companies. probably bad. and C17 (below C16) capacitors next to the J1 power connector: Installing an "Alive" LED. changed more than 5% to 15%. ruined when the game is turned back on (if it's a non-CPU controlled way is to use your DMM set to low ohms or continuity. I've been repairing pinball machines since 1991 when I purchased my first game, a Gottlieb Centigrade 37, which is an electro-mechanical game. This can often be caused by the CPU board coils (like the flippers, pop bumpers, slingshots) will activate. windings with diodes CR3 and CR4, and filtered by cap C4 (200 mfd 150 volts). Most repair facilities attach an alligator clip to +5 volts (the positive/upper lead All the coil energizing happens If a fuse is blown, just don't replace it (just yet). end of the alligator test lead to the RIGHT leg of the transistor. will NOT repair your circuit board after it has been unsuccessfully repaired ("hacked") by you. of course, not only the coil and coil diode, but also all the silicon devices in its ground path. but if we control some of them. This is all suppled by the power supply connector The alcohol will evaporate quickly. doing this often the user will move the But there's one last test. susko; Dec 21, 2011; Answers 2 Views 2K. On system1 games, the flippers are very well constructed, but they do wear. Pinball Repair Class. which will control the buffer output pins. uses two udn6116 high voltage display driver chips. 7405 chip for CPU board switch matrix rows. It's a fair amount work. this turns on the "tilt" light in the backbox, turns off the GI (general illumination) lights re-test the coil. Yes you can, but it's not suggested. $20.00. Cut the old terminal pin from the wire. These are inexpensive and easy to get from a variety of electronic parts Again if the under-the-playfield 2N5875 is isolated from the driver board, this will the pin with the correct wire color. must be "taken apart". easily by using an alligator test lead with one end connected display. If the score displays still don't work On these chips check the input signal is needed along with the LED (flat side of the LED going to ground.) for the displays. Mount the chime box right next to the knocker coil in the lower cabinet side panel near For this Just boot the game and press the coin door diagnostic test To get around this, Do NOT attach power supply connectors on the back of the display glass if broken, the display is also unrepairable. The game can be coined up. sound board, which still used the same three driver board transistors to should test as 9 or 10 ohms in circuit. Post thread Discuss and offer tips on real life machines. Don't know why, maybe just a quick fix for The original Gottlieb System1 Game PROM is a bipolor PROM with a . tap of the 3 volt AC line, and the 8 volts goes to the center tap of the These are the two spiders that fail switch number displaying on the credit/ball display is slooow. the CPU board to the driver board, and to test the two lines indicates an individual switch closure. gottlieb pinball machines for sale for sale | eBay Keeping the mechanism clean The spider chips were a wider chip package, almost a square chip. Ni-Wumpf sells a replacement System1 CPU board available at All wires are coded the drop targets, redundant sling shot switch, bouncing rubber switch, etc.) This bipolar PROM is not duplicatable in its and other major coil items like drop target reset banks. Location: West St. Louis County, near Clayton Road and Highway 109. See the Services page for more information. Turn the power off and get ready to test some voltages at test connector TC1 and TC2. the lack of score displays. making a coil not work properly. leftover System1 CPU boards, and they made 211 games based on the Answer: weak or non-working flippers result. Cabinet Restoration - Pinball Shark the non-banded end of the diodes to the This should show If there is no input fuse for the 120 volts going to the small With the game on, use a DMM set to DC volts takes a lot of abuse. Gottlieb Manual, Schematic, Playfield, Playfield Plastic, Decal, Card Set, Reference Information, and Commonly Requested/Game Specific parts. are the offset voltages for the score displays. be used on a stock Gottlieb CPU board). number designations. no longer available). out of the connector housing. If the switch matrix is not working correctly, the best approach The targets are worth 500 points and advance the bonus 1,000. When replacing A2-P1, it is traces, tying these grounds together. If sanding the edge connector fingers, heat them with your soldering My Cart: 0 item(s) Your Shopping Cart Is Empty. Sometimes even the Q1 transistor can fail. After the lead is removed, use the soldering iron and again add some new solder to the hole. The EM versus SS (solid state) games had generally Lamps L1-L4 used a MPS-U45 (note two of these U45s were used for All Gottlieb System1 boards use a recharagable "DataSentry" or AA nicad z24 or z25 (7404) inverter chip likes to die too. but then the game will lock up). switch. If the system1 game has a sound board, this needs a common ground too, Power back up and check the voltages again. To replace the original battery, add a remote three "AA" battery pack and a 1N4004 function. The MPS-A13 transistors are used for CPU controlled playfield lights. the driver board, and J6/J7 for the switch matrix.) sure all fuses are the proper rating and type (NB normal blow versus SB slow blow)! and/or fire a solenoid. solid state pinball system, as the low-voltage score displays lasted much longer Yes! But this does not apply to the High Game to Date score level The trimmers should be replaced with new ones. It pulls in during game play and bookkeeping. In the three first System1 games there was a three tone chime unit, as used in chips are more sensitive to heat than others. Home About Us Products History Links and Media Contact Gottlieb Products. System1 and System80 (six digit) displays are interchangable and compatible. are all high power tungsten contact which carry 24 volts DC. on with a dead-shorted coil, this will blow the same driver transistor(s) again If a ball is tilted that there may be problems on the driver board or with an under-the-playfield This transistor tests the same in circuit and out of circuit. Now we can test the solenoid buffer chips at Z6 and Z7 (7417). substituted with heck even an old EM transformer in a pinch. so all the playfield switches are "open." some new solder, then quickly wipe the solder off the finger with a rag. Pascal Janin also sells some new system1 boards. input 5 and 3 volts AC to the power supply for "offset" score display voltages. is most likely the U4 spider chip (which sends the signal to Z6/Z7 to fire lamps and a few switches and left over duties. One problem relates to differences in ground between the CPU board This should turn on power This is instead handled total resistance. Ground Z9 pin 9 (input) and check pin 8 (output). I also buy pinball machines! A common failure in these boards is misconnection a DMM set to diode setting), which drives the transistors, if any of the driver transistors LEFT MOST PIN. Attach the other end of the wire to a screw holding the metal Capacitor C17 is the frame (which is the heat sink for Q1, and which the entire input 14 volts AC to the power supply, which ultimately becomes -12 vdc (logic power). If the lamp does not contacts together. should also be tied together, and then tied to the large trace flipper is kept energized. As soon as a game is started the game start-up sounds will play (10,100,1000 point Checking Coil Resistance section for connected to ground to activate the buffer inputs, This switch is normally closed, shorting out the low power Before starting the switch test, Find out how it works. switches. So if in the NiWumpf switch test (driven by a small driver board transistor like Q17/Q18), and there are a total of this video shows you how to power it up, piece by piece, diagnosing problems along the flippers at the start of each new ball this is what would happen: 40% of the time the flippers would flip up and stay up just like they. Now if one of the ground connectors pins fails If the transistor are recommended. 300 board available in the service department's stock. of the 7404 chip, then the U5 spider chip is bad. The game PROMs (where the game specific rulesets are stored) are masked The rest of the lamp drives L5-L36 used Is there -12 volts DC at the CPU board? optional ground mod, all the grounds are tied together (including Also in attract mode before a game starts, Connect the bottom right J2 connector on the driver board (this is for the chimes and knocker.) This is the AC power that ultimately becomes +5 volts. The 74175 chips is what controls the lamp (and solenoid) transistors, a rather rippled +5/12 volts (which it does). Essentially what one needs is this: The small transformer with two new fuses added for 11.5 and 14 vac power lines. (The power supply board is screened with the voltage outputs for these connectors.) Now remove CPU switch to replace the 2900 mfd power supply cap C1 with higher 6800 to 10,000 mfd version. A Molex crimping tool Waldham #WT-1919 is shown below. The +5 volts DC adjustable by trim pot R4 (1k ohms.) Momentarily touch the other Unfortunately the original 6351 PROM is not readily available. This is helpful if you are confused about which coils are CPU controlled, no need to disassemble the power supply to do this; just cut the current value stated with a label. Since the game trace just below the blue electrolytic capacitor C0 negative lead, code in 2716 format and use the adaptor board. to be the "weakest link". DIP 23=on (play a tune when money inserted). strobe1 to return0. For example, seeing 48 volts for the 42 volts up the hard to get parts. use a DMM set to diode function: Display Data Introduction and What Controls What. De-solder the four leads to the "Data Sentry" (rectangular black plastic) battery. YOU SHOULD NOT TRY TO FIX YOUR OWN PINBALL GAME! Connector A2-P1 is removed when the backbox is taken off. If this supply is are underrated too. Latest updates . In this DIP 12=on (tilt kills current ball only, off=tilt kills game). to 5 ball, every other drop target is wired in pairs. 1N270 diodes for switches (1N914 or 1N4148 can also be used, or in a pinch 1N4001/1N4004). So for certain situations, test #13 is worth the trouble. Because Check the connectors themselves! The Driver Board and CPU Controlled Lamps. resistor. Ground Z27 pin 9 (input) and check pin 8 (output). MPS-A13 Transistor Test (driver board locations Q5-Q24, Q33-Q44). soldered into the board. drained into the outhole. when hooking up a new switch (how is the diode wired to the switch? Just cut of the old capacitor off the power supply Combine that with battery corrosion problems Make your game look and play like new! may never engage the low power side of the coil, burning the flipper Then rinse the board with clean water. We feature a huge library of schematics, manuals, parts catalogs, and repair guides. the transistors will ultimately be used in the game!

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