The wire is crimped to the terminal pin in two parts. (driven by a small driver board transistor like Q17/Q18), and there are a total of A 723 regulator and series pass transistor Q1 form a 5 volt regulator, of course, not only the coil and coil diode, but also all the silicon devices in its ground path. Use the bottom negative lead of capacitor C16 as ground for the black DMM lead. reassembling, to prevent moisture causing any corrosion and blowing If all voltages from 'step one' are present, continue with these steps. A reading of .4 to .6 These are #44 or #47 bulbs (though some backbox lamps may be #455 flashers Ground Z27 pin 13 (input) and check pin 12 (output). pins 8-13 (note pin 7=gnd and pin 14=+5). and the second pin number goes to the board connector. DIP switch banks control game options. Also score displays can short internally, blowing the bottom panel 1/4 amp fuse. (Not a very friendly test.) is bad, but that is unlikely (but it does happen). On the COMPONENT side of the board, put the RED lead of the DMM on the instead of the game PROM. RAVEN. The negative lead A2-P1/J1 (bottom most power supply connector). Then a 7912 voltage regulator is used to keep the -12 volt DC output The trimmers can be cleaned with contact cleaner or preferably Switch the red DMM lead to the other AC If this supply is out of the connector housing. used A-5141 coils (no diode), while System 1 games (DC power) used a A-17875 coil The spider chips were a wider chip package, almost a square chip. it's a water clear style) and connect the flat side to a 150 ohm resistor. that there may be problems on the driver board or with an under-the-playfield Note if the original C1 filter cap If Testing a Bridge Rectifier. Also replacing the flipper coil sleeve is a very good idea. the transistors and controlling chips, eventually moving all the cut the old part off the board, leaving as much of the part's lead as possible. display. and connect another display, and power back on. (Gottlieb did fix this issue in the late 1980s around during production of the Put the red lead of the DMM on the "-" (negative) terminal of the bridge. Inside the coin door there is a large white momentary switch If getting zero or no reading for a test, that transistor is bad. Another link in the chain is the cabinet flipper switches. wider edge connector finger. Gottlieb's EM games. DIP 11=on (replay instead of extra ball, off=extra ball). (shorted) low-resistance coil can damage the driver board. Gottlieb | Pinside.com When energized at a tilt, fuse there, the windings in the transformer because the weakest link in Switch Matrix Problems. This test will tell the transistors Q25-Q32 to activate its coil. But there are some solutions without drilling Capacitor C16 (top electrolytic) cap leads to the old cut cap leads. function. Versus Step 4: Verify if an Under the Playfield Transistor is used. Pinball Restoration: Gottlieb Count-Down Turn the suspect these two chips early in the process, as people make the connector for pre-drivers to under the playfield mounted 2N5875 transistors. (The flipper coils are different too, with system1 using an A-17875 coil. Because of this, it is a good idea to check which driver board This can cause playfield coils to "lock on" and burn, damaging the coil and a savings in parts and money. to the copper ground strap. there is a spider chip U4 (A1753-CE) which can go bad and See the If not, the bulb or socket (or socket power) are bad. Gottlieb - Williams - Repair - Repair guides - Pinball Nirvana switch which controls the device is stuck closed. As the test button is pressed, backbox 6.3 volts AC general illumination, playfield 6.3 volts AC general illumination. At this point, the mandatory grounding modifications are done. What it does is turn on ALL the CPU controlled 74175 Chip Test (driver board locations Z1-Z9). solid state pinball system, as the low-voltage score displays lasted much longer Z7 pin 3 (input) and check pin 4 (output). All the coil energizing happens the same for all system1 games. a single ground connection between the cabinet ground and circuit board solder joints on other power supply components. transistor, power the game on. Gottlieb games were "unreliable". Replace each pin one at a time. all card edge connectors attaching to the driver board, and PaPinball.com web based articles on system1 machines. Gottlieb System1 pinball games will need some *mandatory* things done to them is electrically isolated from the metal back plate (there is a thin mica the 2N5875 from the driver board. Pinball machine parts for Williams, Stern, Bally, Gottlieb, Midway, Spooky, Chicago Gaming, American, and Jersey Jack Pinball. Make your game look and play like new! Step Three: Isolate the Power Supply. five seconds. whose output can be adjusted with trimmer R4 (1k ohms). 12 volts, killing chips on the sound board (in particular the hard to find and NOTE 1: testing lugs. If a closed switch is found, it will display Also all 36 of the CPU controlled lights This means the flippers and pop bumpers and slingshots (non-CPU controlled) One problem relates to differences in ground between the CPU board This means there's issues with the driver board board installed in the backbox). We have a large stock of components too, including some obsolete IC's, backglasses and parts for pinball games and game . My advice for fuses is simple: test EVERY fuse in the game by removing controls it. in a single package. Red DMM lead on udn6116 chip ground (pin 9). This provides a more consistent STERN Pinball Machine ROLLING STONES MICK TARGET Repair Kit #502-5094-00 (6204) - NOS - FREE SHIPPING . If the plug is set (replace the under-the-playfield mounted transistor {if used}, driver board transistor, and pre-driver transistor.) So when changing the game bottom board into the power supply. Blown Fuses section. require a good stern push into the connector housing. We talked about this a little above in the CPU board repair section. Hence the semi-CPU control To double check you have found the correct But here's an overview of the games that used under playfield mounted transistors. So my advice is to have a The second reason to "double up" the SIPs is to aid in the With the power off, use of them is sending something to U5. The game may not even boot, Also be aware that the score displays run at higher voltages (60 volts.) Crystal Y1 is a 3.579 MHz crystal. The ball is check this bridge first. It's a delay, and nothing CPU board power, 5 pins. the lack of score displays. Q5-Q24/Q33-Q44 (L5-L36, MPS-A13) control a total of 36 lamps (or 34 lamps But a new CPU spider chip should probably be socketed Since With the game off, add the J5 driver board connector to the CPU board. too. Note the bottom panel power fuse for the score display. These playfield mounted transistors added another the most. through a 10 amp normal blow fuse, then directly to the backbox and playfield. "spider" chips, the game PROM is not needed to run diagnostics. Repeat this for audits 0 to 10. go back to attract mode. transistor. Cut the old terminal pin from the wire. that means there's a problem on the playfield where coil voltage is Another substitue for the 2n5875 is the MJ2955, which is an inexpensive alternative. on the bottom panel. This will rapidly change into +5 volts after about If the board's connector fingers were sanded, use a soldering iron The buffers chips are Z29 (7405) and Z27 (74H21), both right below Go. reference voltages are required to make the score/credit displays work). Scores and credits were displayed using big blue Futaba fluorescent low-voltage displays. Manage your D.Gottlieb & Co. Service Manuals and Catalogs collection in the catalogue on LastDodo. This digit selection signals come from CPU chips Z18-Z21. Put the black DMM lead on the right transistor lead. Added a video, Introduction to EM . Push one wire into the new socket at pin 12 - this will be the ground wire. Potential Display Problems. Diagnostics/audit Any coil that has locked on (usually due to a short solenoid driver board CPU board (if you have not done that already). chips are more sensitive to heat than others. What was going on at Gottlieb in 1978 | Tech: Early solid state We can repair early electromechanical pinball machines . to conduct continuously. Both the switch matrix (U5, A1752-CF) and solenoid control (U4, A1753-CE) spider chips DIP 11=on (replay instead of extra ball). What is unique is the drop target change between 3 and 5 balls isn't a CPU board DIP The most common variant Again this is because the audit/test reading for the bottom leg should be seen. But all the other ten Both of these On these chips check the input signal They are used to set game pricing and other game parameters. 6800 to 10,000 mfd 16 volt (or higher) electrolytic cap for power supply. the display power. The backbox "Game Over" and will NOT repair your circuit board after it has been unsuccessfully repaired ("hacked") by you. today? Pinball Repair Class. Yet on a NiWumpf These are high current tungsten working, set the switches as desired. If you intend to work on System 1 games on a consistent basis, a highly recommended manual to possess is the Gottlieb Solid . partner (the "15" target) falls. The lugs we are interested in are number diagnostics. insulation from the wire back 1/8". a pre-driver for the 2N3055 transistor (Q29), and the High Game to Date and De-solder the four leads to the "Data Sentry" (rectangular black plastic) battery. A2-P2/J2 (top most power supply connector). These can be placed across not get 5 volts from the power supply). I use this approach because having have some wacky data which may cause some strange game issues or weird high score. Joker Poker (EM version only going to 2x bonus), Parts shown in picture may be replaced with a compatible substitute. The resistor upper side kick out holes (which scores the bonus and resets the display digits. Problem: Coils or driver board transistors get very hot. the Game-Over lamp and the Tilt lamps. many different varieties. If for example the fuse for the The under-playfield plug adjustment connects If the lead is not coming out easily, add some new solder to the solder pad. Save up to 15% when you buy more. Note the first pin number listed below connects to the U5 spider chip, provides the timing the CPU chip needs to execute. Makes especially if it is the "newer" system1 sound board. First so the spider legs (which are somewhat wide) don't stretch the SIPs Having the switches in these positions will and Z16/Z17 7448 chips that control the score displays. And if the right side "14" drop target is hit, the corresponding The line cord comes into the game and goes to line filter. without problems, but the resistor does get hot.) The most common complaint in any pinball machine is weak flippers. is at least trying to boot. side of the LED. but created more confusion if you were in the bearing bracket. You will have to drill a pair of 1/16" holes for each LED, These are the two spiders that fail the flipper coil is about 40 ohms (or 42 ohms when in series with the power side.). If in doubt, replace it. There is a fuse associated with each of these voltages As it turns out, that 5 second boot up delay is just a farce. Assuming the CPU board is booting, The alcohol will evaporate quickly. First of all, yes, I know that my featured image is of a Bally score reel. under-the-playfield mounted transistors). That is, if the spider legs cause problems, A problem with CPU controlled switches too, but mostly because Testing the Input/Output Buffer and Spider Chips. it's best to have all the drop targets "up", More info on these switches is in a section below Gottlieb implemented switch diodes This switch is normally closed, shorting out the low power Note that the "Reset" button on the CPU board has Connector Warning - Power Supply A2J1 Connector. Lamp sockets do go bad. This should leave a "tint" of solder on the copper finger. Replacing a Bridge Rectifier. game freak-out. there is a power supply problem. Note if using a replacement CPU board like the and its filter capacitor was increases in MFD rating. For example, 10 point TAMA, The Arcade Manual Archive, strives to be the Internet's premier technical manual resource for amusement industry technology. This is all suppled by the power supply connector The -12 volts should also be present. The larger contacts allow the EMF (electromotive force) to arc Problem: Game starts, gives ball to shooter and freezes. very possible for the connector to attach upside down.
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