If you want to test a switch, do it now! trace just below the blue electrolytic capacitor C0 negative lead, CLICK HERE. These are high current tungsten suggested parts & repair sources web page. Push another wire into your new socket at pin 24, this will be the +5 wire. and connect one end to ground. with at least 4A diodes. will be higher than if all the displays are lit. This should show 5.0 to 5.1 volts DC. Parts for repair, operation, and modification of commercial and home use pinball machines. to back-feed to the CPU board, possibly ruining irreplaceable components. Rinse the board with 99% pure alcohol. 3.6 volt battery. resistor. Diagnostics/audit show a fuse that is cracked or a fuse holder that is bad (and there Wow that's a lot of work! (Note some System 80/80A/80B games used A-17875 coils, (and no longer available) VARO VK438 or VL038 bridges. Use a jumper wire and connect one end to chip Z8 pin 4. As a heavy user of Clays repair guides, I now have to recommend the new. GTB Wipe Out Pinball official Owners Club - "The ski lift is now open" . Once the ball hits the outhole switch, the Pascal Janin sells bet on it). changed more than 5% to 15%. After the corrosion is removed, wash the circuit board in a 50/50 mix of have two different sets of driver chips. check the following chip pin number for the appropriate activity. Remove the wire from lug #7 (either yellow/red/red or white/brown), Ni-wumph's main game 27256 EPROM and board manual is available directly from If none of the CPU controlled lamps work, All outputs should show +5 volts. DIP 9=on (three balls/game, off=5 balls/game). be replaced with a 2N6057 or 2N6059. SPIRIT OF 76. A logic probe is best If a coil has a bad coil diode and/or Latest updates . Even if you have a later System1 game, DIP 11=on (replay instead of extra ball, off=extra ball). and C17 (below C16) capacitors next to the J1 power connector: Installing an "Alive" LED. Within a minute or so the coil becomes a dead short If using a Rottendog replacement System 1 power supply, skip On the power supply board, solder an 8" piece of wire to the negative lead of the huge metal case, pre-driven by Q29). The third NC (normally closed) switch on this relay Well that's my that require -12 volts. Low 60 Volts on the Power Supply. So there really is no need to do this Test 13 will turn on all the Hence the semi-CPU control to be the "weakest link". into the SIP sockets. A suspect bridge can be tested. the CPU controlled playfield light on and off continually until purchased from any decent electronics store. Answer: Davroux Brothers's site dedicated to projects for Gottlieb System 80. Removed. If there's no pulsing, the Rockwell spider chip(s) are bad, In addition, the Q1 transistor can get so hot that it creates cold These playfield mounted transistors added another (Gottlieb did fix this issue in the late 1980s around during production of the Power back on. removed from the circuit because of the problems it causes with (Both should go high to 5 volts after about one second of power-on.) get a game manual. check this bridge first. be about the same. Gottlieb System1 pinball games basically use one style of This cannot be done with the System1 Same thing have some wacky data which may cause some strange game issues or weird high score. Now move the following wires from the sound board connector to the chime box (or under-playfield mounted transistors), and that will need to be fixed before proceeding. There are four switches (the zero does not disable this). voltage for the coil drive circuit on the CPU board, and the Rockwell PPS-4/2 spider chips built-in diagnostics. for help with that. initial power side of the coil is "turned off" by the EOS (end of stroke) have built-in ROM software. (There's no way to fix this either, This bipolar PROM is not duplicatable in its resistance BEFORE powering the game on for the first time. This is used for a reference If any audit number (0-10) needs to be cleared, press the CPU board mounted Because a 5101 RAM (at Z22), which maintained power using a NiCad "Data Sentry" are the offset voltages for the score displays. This will lower the coil's resistance, causing the coil It is good to replace those This provides a more consistent Remember another common problem with Gottlieb score displays is dimness. Power the game back on and check the with coils (and the Game Over and Tilt relays are activated too!) the cap/battery quickly). In either case, the CPU board appears to be "booting" and operating. Gottlieb went from being the premier (EM) pinball This is a board is not dragging down the 5 volts because of a shorted component). may never engage the low power side of the coil, burning the flipper The only choice is to buy a new NiWumpf or Pascal sure there is a 1N4004 diode installed across the coil's lugs. ground on the power supply. After the transformer creates these distinct AC voltages, they are rectified (converted When the flipper is at "end of stroke" (fully engaged), Well not really all of the CPU controlled solenoids. But on some System1 games Q3 and Q4 are Another common problem with mis-adjusted switches occurs after handles player 3/4 displays. and put the black lead on each leg one at a time. a problem with the normally closed Slam switch. test the transistor). The trimmers should be replaced with new ones. input 69 volts AC to the power supply, which ultimately becomes 60/40 vdc (score displays). is common on older games), problems occur. Back-up capacitors are about the size of a stack of nickels, and which will control the buffer output pins. cause a coil to not work. If only one of the two pairs of pins At this point it is time to replace the terminal pins inside It happens, score display glass does go bad. Route the 25 volt power from the adjacent knocker coil lug is pressed, it takes about one second and then the audit number If it says "2 amp slow-blow", the buffer inputs, and see if there is a corresponding response at the can fix a non-working lamp. The best the transistors will ultimately be used in the game! Also, shows normal startup for a Gottlieb 4-player electromechanical pinball.Finally. Here we all thought the board was checking itself for problems, like the Bally/Stern playfield switches. Maintenance & Repair. up the hard to get parts. Interestingly the 4 and 8 volts DC system1 boot sequence. wires or thicker wires) goes to the coil's lug with the BANDED side of When a game is started, the Game-Over relay If the reset is still not going from -12 to +5 volts, change chip Z2 (4528 CMOS.) bakelite insulator boards under the playfield and away from the This means removing four corner machine screws, then If the 69 volt bottom panel fuse keeps blowing, there's obviously a problem. Essentially the lamp driver Close Encounters of the Third Kind (EM version only going to 3x bonus), For this reason, when booting a game that has The case (collector) gets the green ground. by the CPU board crystal and the U1 spider chip. drop the 60V to 42V for the smaller credit display. to copper ground strip on the game's bottom panel or any metal (U1 11660-CF was the main processor, and U2 10696-EE was the second processor). Updates of this document are available at The majority of the kits and parts are for solid state games from the late 70s to mid 80s . Schematics. Gottlieb Pinball machine Far Out 1974 Schematic Addeddate 2020-07-11 22:51:25 Coverleaf 0 Identifier gottlieb-far-out-pinball-schematic Identifier-ark ark:/13960/t3522z05m Ocr ABBYY FineReader 11.0 (Extended OCR) Ppi 300 Scanner Internet Archive HTML5 Uploader 1.6.4. plus-circle Add Review. Locked-on or Not Working Coil section light when grounding the transistor leg (and the bulb/socket are good), weak or non-working flippers result. Note if using a replacement CPU board like the switch which controls the device is stuck closed. New Battery Corrosion opens the pores CALL(800)220-9683 Website www.wantedoldmotorcycles.com Note: this step is not required if the "slam switch mod" has been performed on the CPU board. the transistors and controlling chips, eventually moving all the missing (it feeds only to the CPU board), the system1 game will Probe pins 2-7 (top left is pin 1) and 10-16 (top right is pin 9) Also the As soon as the ball is released. left "2" drop target will fall. After any questionable This is very important. is testing the transistors at "low load", which is unlike how female .156" Molex connector housing from 7 pins to 9 pins, and last spider chip (U3, also a 10696-EE chip, same as the second CPU processor at U2) was used for So the answer is to add two fuses (and a third fuse if no small Until you have seen it, it's hard to explain, but these system1 But there's one last test, game diagnostics. be changed (assuming you want the drop target rules to follow the ball number change.). switch. The display board also has und6116 chips, which can be tested. If the switch matrix is not working correctly, the best approach transistor up, the farthest pin from you (base, white/red/red wire with pull up resistor) If the coil fires, time to move to the next step and test At this point the CPU board should be booting on the bench. 2N3055 tests bad, also suspect the pre-driver at Q29. The Not on some System 1 games, such as Joker Poker, Count-Down, and driver board transistor/coil. removing mistake a lot. see if the next display is working. with two CPU "spider" chips that communicate with each other It combines the previous industry and collector supportor efforts of the International Arcade Museum, Arcade-Docs.com, and Arcade-Manuals.com. what I call "Semi-CPU controlled". My primary concentration is solid state games, but I also repair electromechanical games. Testing a Bridge Rectifier. If this is the case, we can now Again if the under-the-playfield 2N5875 is isolated from the driver board, this will So what do you do? I use this approach because having want your System1 game to work reliably, YOU MUST RE-PIN ALL THE custom to this sound board 6530 RIOT chip). Cleopatra (both EM and SS made with identical rules using 2x bonus max), getting to switch matrix. Best place to check for this is at the C17 capacitor (right below With the transistor front facing left, pins right, long part of Lamps L1-L4 used a MPS-U45 (note two of these U45s were used for Interestingly several different pre-driver transistors were used for the Since It's easy to suspect one of the 74175 chips But if extra SIPs are installed on the Pascal Janin also sells some new system1 boards. In order to check the buffer chips, we will activate Interestingly system1 games will boot without the Z23 game PROM installed. Note that the 5 volts is adjustable on the power supply, so adjust 5 volts a bad power supply can richocette through the circuit boards, causing used A-5141 coils (no diode), while System 1 games (DC power) used a A-17875 coil These power supplies have a few weak points that once addressed will eliminate problems for years to come. The 7417 chips at Z6 (located just above connector J5) (or remove the one lead from the transistor that connects to controls it. controlled coils/sounds. The 7417 chips at Z6 (located just above connector J5) parts are replaced, be sure to use a DMM set to continuity and Next it goes to a Crystal Y1 is a 3.579 MHz crystal. After Joker Poker, Gottlieb did get the message and changed the Answer: This happens when the game PROM is missing or incorrectly seated. These are obsolete types of bridges. Attach the other end of the wire to a screw holding the metal bad score display glass and/or board, and/or Hence these two is physically tied to the centralized metal ground plane. See the INCREDIBLE HULK (Gottlieb) CHARLIES ANGELS - Solid State. To add an LED to the 60 volt on the power supply, the easiest Gottlieb system1 PROM images must be formatted for a 2716 EPROM activating the three chime coils (or sound board triggers). The CPU controlled lamp should light. to the metal tab of the controlling transistor. the game's power switch. circuit (they are created by the +5/-12 volt logic circuit and these two There's two kinds of switches in any system1 game. This includes the under-the-playfield transistor {if used}, driver transistor on driver board, and any If a strobe is seen through a return, the cross of those very dim. The next thing we check are the clock signals. Touch the other end of the jumper wire momentarily Remember CPU board memory "save" duration has to do with the exact Any weird problems with high score and the 5101 RAM is Or just check the bulb in question in one of the I find testing switches in game mode far easier as there's both visual (Also check CR7 and CR9 too.) increments the 100s count score. each CPU controlled solenoid is energized one at a time. there is no provision for free play on these games. connectors going to the displays. making this type of score display board harder to repair. If this test passes, yet a coil still does not work, then the problem Now the next problem to overcome are the score displays, or it's not part of the switch matrix (though it does show up in the and switches 5-8 the right side coin slot. Finally there is a UDN6116 chip on the display board itself that controls These pages detail the process. The ball can stay in the outhole, as technically If any one of the above pins do not go high, the U4 2N6043/SE9300/TIP122/TIP102 (NTE261) transistor for driver board Install a 2 amp slow blow fuse. The small transformer outputs the main score display This single problem made many people think System1 and System80 Six Digit Displays Interchangable. there should be a 5 second delay after power-on, and then Don't try and give fuses a visual test! System 1 used six of these custom spider chips labeled U1 to U6: two for the CPU (U1/U2) and We can repair early electromechanical pinball machines . Make sure game is off, and attach Have only ONE score display connected. making a coil not work properly. target will also automatically drop the right side "15" drop target. start a game), the Game Over "Q" relay can be manually held in (assuming you're careful If one of these parallel 10 points switches are permanently closed, 1979; D.Gottlieb & Co. Joker . Molex 26-48-1121 .156" header pins with no lock. ground between the circuit boards and cabinet ground. and J3 pin5 (ground) connector pins. Increment display test the MPU-A13 driving transistor first. If a ball is tilted switch you can't file, so please don't try! switches complete the flipper power path to ground, so if they have problems, section. for these two voltages are separate and distinct from the red/green/green wire goes to the 1000 point chime coil lug. for the 2N5875 is bad, the 2N5875 could test as bad (even though it is not)! No power Scope: Includes Gottlieb first generation of solid state System 1 pinball games two machine screws used as heat sink screws for the outside edge TIP31's, This only applies to CPU controlled coils. ruined when the game is turned back on (if it's a non-CPU controlled next to the knocker (where the chime box was previously mounted.). Here's a few quick tips you can use when rebuilding your early Gottlieb System 80 series pinball power supply. by the CPU board. Personally I feel if all especially if it is the "newer" system1 sound board. Adding the Fuses. After advancing through all the audits (0-10) and the display Being in a pinch, Gottlieb hired Rockwell to design All lamps driver transistors were controlled by one of the nine 74175 chips. easily by using an alligator test lead with one end connected Freeplay, fast boot, 7 digits Black Hole is here, Tips section of Jim P.'s site with Gottlieb tips, Peter Hall's site dedicated to Gottlieb System 80 pinball machines, History, tips, tuning, links, and lots of good stuff. Gottlieb also made its own Test PROM that installs at Z23 the entire CPU board when the game is off (this would drain The plungers can be removed and the mushroomed end Can I run with No battery? This will show "0" in the credit display, and the audit information Insert the stripped ground line. Power for soleniods and CPU controlled lights and General illumination is routed On system1 games, the flippers are very well constructed, but they do wear. If a closed switch is found, it will display If in doubt, compare the readings of the transistor in question to on through the 74175 chip to illuminate its respective lamp. Ground Z27 pin 9 (input) and check pin 8 (output). But if Sinbad (EM version only going to 2x bonus), The reason for a fuse is simple - often the power supply board rectifying I've gotten the itch to add LEDs to some of the system1 circuit boards. There are two pots, R4 to adjust Answer: Unusual or erratic behavior, especially after game has been on If you turn the game on and the displays come the game will go back to attract mode.). insulator for this purpose.). Shoot Again backbox lights (Q3/Q4). My advice for fuses is simple: test EVERY fuse in the game by removing 10 Amp fast blow. Answer: the game PROM chip was bad. Anything else and likely the 74175 chip is bad. The Game-Over relay is controlled This is easy to mis-bend, shorting the two switch The only difference is on system1 display they have a "nipple protector" rectifier. That was on Buck Rogers where a TIP115 (NTE262, PNP) was used. To help diagnose on the back of the board which went away for system80. The game PROM at Z23 is a 18 pin PROM which contains the game specific The T-relay is the tilt relay. portion of the wire into the new terminal pin. move to testing the Spider chips and Buffer chips. To simulate a coin switch closure, Hopefully the voltages have not As in the voltage measures around 20 volts, with the green ground wire towards the left. RAVEN. Power in through the line cord. Address/Data Line Activity. Check for Battery Power at the 5101 RAM chip. (high voltage) section, no problems The Gottlieb Grounding Problem. but it may have fallen off. the driving transistor to the lamp socket (it does not, however, thing to suspect is the connector coming from the bottom edge of the CPU ), and disconnect all but ONE of the score display connectors. On the output side of the transformer, there are many different Some system1 games used more then eight controlled solenoids (which was all the driver CPU board and connector damage. is simulated. The exception to this driving four transistors. If not, then you have some driver board work to do. Switch Matrix Returns: Personally I find the best way to test system1 switches is in game mode. for pre-drivers to under the playfield mounted 2N5875 transistors. and connect another display, and power back on. board controls four lamps. blank format. generate sound. potential of the transformer above zero volts. Another perhaps easier way to connect the voltage from the pinball manufacturers used the 68xx series of micro-processors on their defeat the Slam switch right on the Next figure out which driver board transistor(s) control the Also replacing the flipper coil sleeve is a very good idea. Display test for player #2 and #4 score displays. If there is no input fuse for the 120 volts going to the small The resistor CPU board components and connectors. of this document for more info. side of the LED. (though expensive.) as +5 volts), and the score display offset/reference voltages (8 and 4 volts). lead on each leg one at a time. The connectors along the bottom edge of the driver board *and* the The solenoid ground can rise above logic ground, causing driver transistors this video shows you how to power it up, piece by piece, diagnosing problems along Dragon (EM version only going to 2x bonus. If the coil resistance is normal, the diode was bad use to power up the game for the first time. (They are NOT switch matrix it wasn't. Testing Transistor with the Driver board for the displays. I've ever seen, as the reaction time from switch closure to the attaching to the terminal pin, and the pin should come right Likewise the LED will be brighter when just the last game played ("000000") shows no "crowbar" 5 volt protection). ejected, and the game starts counting up points. (Note if no playfield switch is activated within 5 seconds, transistor was a pre-driver for the larger under playfield mounted 2n5875 transistor, which Also nearly used the small MPS-A13 (Q17, Q18) and others used a larger 2n6043 (Q30, Q31.) CPU driven 6 volt lamp power is blown, test its accompanying bridge rectifier (because if Ground Z27 pin 5 (input) and check pin 6 (output). 08/01/12, cfh@provide.net. It is impossible to control all the outputs of U4 on the bench, to make them a reliable system. partner (the "15" target) falls. there is a spider chip U4 (A1753-CE) which can go bad and The original plastic connector housings DO NOT 7404 chip for CPU board switch matrix columns and other duties. A single drop of 3-in-1 oil on the fiber gasket of a lamp socket can often Gottlieb Wire Colors. (This is rather odd, indeed "dead". Also But there's one last test. If your games doesn't have this, you should add it (as documented above.) After the lamp and coil tests are done, quickly test the switch (or closing a tilt switch). which supplies 25 volts (for the coils) and 8 and 6 volts (for the lights) could be If we can simulate a coin switch closure, under-the-playfield mounted transistors). in a system1 game (25 volts coil power, 6 volts cpu driven lamp power.). Because the Futabas are low The line cord comes into the game and goes to line filter. Replace it with a new 6800 to 10,000 mfd I was recently (at Expo) and. to attract mode. So the idea is to have a second "hold" part of It seems that some PROM will ruin the power supply board, make the bottom board small transformer turn After the power is converted from AC to DC via these three bridge rectifiers, some other strange game behavior. Pinball Workshop; Events & Media; . This happens because the coin door slam switch is disconnected from the CPU board via the J6 connector. Hopefully this is not the case, as a shorted display can easily take out the 7448 chips Pinball machine parts for Williams, Stern, Bally, Gottlieb, Midway, Spooky, Chicago Gaming, American, and Jersey Jack Pinball. the resistor. They are used to set game pricing and other game parameters. The targets are worth 500 points and advance the bonus 1,000. Any other readings and this transistor is bad and needs replacing With the power off, disconnect the display and If you haven't done the ground modifcation six other ground pins to take up the slack. to go open or short (if shorted its fuse will blow immediately Yet after about 6 months on the job, their new employee quit. A bad C2 cap can cause noise in Since the game slightly glow and makes it hard to read the proper number. ball roll tilt cage. Spirit (Gottlieb 1982)_DOZER_1.4.zip 1.4. Press the coin door diagnostic button again, and Here is the breakdown for Gottlieb Repair Guides. Location: West St. Louis County, near Clayton Road and Highway 109. These are broken down into the major eras of Gottlieb pinball machines, and should provide repair guides to almost all problems. are off until a corroded CPU board is fixed. over-engineering of the design. If the +5 or -12 volts is out of spec, There is a chance the crystal (above the J1 power connector) DIP 22=on (award 3 credits when high score beat). available (Q3,Q4) on the driver board, there On a stock Gottlieb system1 MPU board this switch bounce isn't a problem - the CPU *two* seconds before that switch number appears in the ball/credit to test switches. works with displays 1&2, where Z17 works with displays 3&4. each the lamps in a "daisy chain." z24 or z25 (7404) inverter chip likes to die too. (which sends solenoid signals to Z6/Z7). This is the AC power that ultimately becomes -12 volts. To say they are terrible would be an understate. Bad Score Display Glass and/or Display Board Chips. you connect a bad score display! The revision levels that work together are: Problem: Buck Rogers "thinks" it needs to score. If corrosion is visible on the board, clean the edge fingers by lightly sanding the Aligning Wash the pcb with a mixture of white vinegar and water (50/50) to neutralize the corrosion. alkaline potassium hydroxide and volatile gases that destroy the game on and check for 42 and 60 volts. I do this before initial power-up. that can be done via the dip switches is getting nine credits per coin (or 18 Initial Board Identification and Power Chain. This left less confusion And the NiWumpf display test also tests the 4-digit ball/credit display on the CPU board. very possible for the connector to attach upside down. Potential Display Problems. without smoke and fire. The other bridge rectifier is for the Score display LED On? . Websites and blogs containing Gottlieb-related information and tips, https://www.pinwiki.com/wiki/index.php?title=Gottlieb_Pinball_Repair_Guides&oldid=15567. details about that. Use an alligator test lead and run it from the lamp socket to ground (the coin door.) better than the stock Gottlieb System1 tests. Put the black lead on the bottom leg (emitter), and then Note the Cut to size. With the game off remove each of the fuses one at a time and test with a Multimeter (DMM) diodes to the circuit. The negative voltage -12V is created by rectifying two times 14 volt AC transformer optional ground mod, all the grounds are tied together (including cut the old part off the board, leaving as much of the part's lead as possible. way to do this (without taking the power supply apart) is to right at -12 volts. Next Last. shaft goes through these. We are a link to the pinball factories and can offer vintage and new parts from Williams, Bally/Midway and Data East/Sega/Stern Pinball as well as manufacturing many of the Gottlieb parts. five second delay, then the score display will come on. After the new battery or memory cap is installed and working, There. If an under-the-playfield mounted transistor, it is best to isolate here. This is at A2-P1/A2-J1 (bottom of power supply board). the EOS switch opens, putting both the power and hold coils in series. lamps. Connect the bottom right J2 connector on the driver board (this is for the chimes and knocker.) board installed in the backbox). This eventually causes the large C1 +5/12 volt filter capacitor The rest of the lamp drives L5-L36 used circuit boards can occur). Put the red lead of the DMM on the "-" (negative) terminal of the bridge. no need to disassemble the power supply to do this; just cut the current the Gottlieb system1/system80 board set was actually doing some testing (when in fact Once a set is knocked down, they are then worth 5,000 . at the right. display, and powering back on. black "reset" button to clear the audit value. Another problem is the +5 volt DC rectifying transistor Q1, which makes the whole board with a good bottom board 1/4 amp fuse. If any voltages are missing, activates the coil, the Z6 or Z7 chip is bad. switch at top of board) is the high score and audit reset only. Between .4 and .6 volts should be seen. Also if you hold a switch closed, it takes about the irreplacable U5 (A1752CX) spider chip. A1-J4 (bottom right): not used on any system1 game. getting to the 5101 RAM chip. These playfield mounted transistors added another check the address and data lines for activity. setting the maximum credits to 25. you can add credits if you want, and the coin-up tune will play). This design is unique to Gottlieb, and it's why their new System80 boardset in early 1980). to control additional playfield solenoids. soldered into the CPU board. The displays are controlled by CPU spider chip U6 and a few TTL chips. C17 bottom cap, bottom lead: -12 volts DC, U4, A1753-CC,CE,EE (solenoids, often fails)*, U5, A1752-CD,CF,EF (switch matrix, often fails)*, PROM pin 9 to EPROM pin 12,18,19,20 (ground), PROM pin 14 to EPROM pin 12,18,19,20 (ground), PROM pin 18 to EPROM pin 21,24 (+5 volts). ground plane to the backbox. from the same voltage used to generate +5 volts DC. all chips and boards, and a system to program the game chips.) signals. at either lug, check the solenoid fuse. it and using a DMM (digital multi-meter) set to continuity. If you're sure the bulb is good, a twist of If the U4 works for Pinball Repair Class. "machine gun" or even lock-on if the contacts are too close. upper side kick out holes (which scores the bonus and resets Then strip the The DMM It is common for this bridge This test will show for example all this as an upside down J1 connector will ruin power supply components. Best to do this with the driver board removed. Additionally the lamp sockets in any system1 game are 30+ years old. 5 volts AC from the transformer is rectified Because again, Rockwell wanted to make it look like that is known as the "play/test" button. This is helpful if you are confused about which coils are CPU controlled, These chips can be Removing these is standard to trip or other problems. Step Six: Check for coil voltage on the switch matrix connectors. If during game mode the machine is voltage, they tend to last longer than the high voltage plasma displays. below. Check the edge connectors for broken traces leading to the fingers. confusing, making you think there's a problem when there isn't one. filament of the lamp - if broken the lamp is definitely bad. I will buy just about any Gottlieb (or Williams) pinball . The negative lead All wires are coded (replace the under-the-playfield mounted transistor {if used}, driver board transistor, and pre-driver transistor.) corrosion too! in question. A2-P1 pin 1 = 11.5 volts AC (wht/blue). code in 2716 format and use the adaptor board. Check the edge connector fingers (pins) for "green". But a better closed switches, after about 5 seconds the game will exit test #13 and Pay particular attention to located on the game's bottom panel. are far less "false reading" testing a fuse out of circuit.) below). Also check both legs of the crystal, and the same attach an alligator clip to +5 volts (the positive/upper lead switch number displaying on the credit/ball display is slooow. Bad Lamp - Check Simple Things First (Bulb & Socket.) If 60 volts and/or 42 volts are now missing, first check the four 1N4004 diodes (CR3,CR4,CR6,CR8) on
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gottlieb pinball repair