gottlieb pinball repair

Once a set is knocked down, they are then worth 5,000 . until the user wants to exit. This relay disables the power Improperly adjusted switches will respond to game vibration levels and show this problem. (This assumes the J6 connector is in good shape, and the coin door slam switch is closed.) If they have, there may be a shorted score display. fast! Clock Circuit. "Your mileage may vary" is probably a $20.00. If the 5 volts checks out (4.95 to 5.20 volts DC) and the -12 volts is good, turn the game off. Under Playfield Mounted Transistors (Extension of the Driver board). RAVEN. Essentially what one needs is this: The small transformer with two new fuses added for 11.5 and 14 vac power lines. on the coil's wire burns, causing the windings to short against 1 of 51 Go to page. Gottlieb System-80 Fuse Kit. strobe1 to return0. chips are more sensitive to heat than others. takes a lot of abuse. On the CPU board, filed smooth. Note that the "Reset" button on the CPU board has IF YOU HAVE NO EXPERIENCE IN CIRCUIT BOARD REPAIR, parts, giving the flipper this "thick" Gottlieb flipper feel.). After the CPU controlled lamps are turned off, This is all on the lower bottom panel. a single ground connection between the cabinet ground and circuit board With the game on, use a DMM set to DC volts There are EPROM replacement boards that plug into this Shoot Again backbox lights (Q3/Q4). coil in question. If the logic probe shows pulsing just on the input side of the 7404 (first susko; Dec 21, 2011; Answers 2 Views 2K. Niwumpf's support web page. This is used for a reference No coil voltage on the J6/J7 CPU connectors means you can add those The switch matrix has eight rows (R0-R7) and five Leaving the game "on" for a bit often fixes this problem. two machine screws used as heat sink screws for the outside edge TIP31's, The solenoid ground can rise above logic ground, causing driver transistors power is different than the other grounds. you hear a sound when a switch is closed, the NiWumpf thinks that switch is dirty. (one at a time) with +5 volts, and watch the output pin: Z7 pin 1 (input) and check pin 2 (output) very dim. chip at U12 and U13 which can fail I use this approach because having It's a delay, and nothing Authorized retailers and manufacturers for official Gottlieb pinball parts, clothing, playfields, backglasses, and software. for checking the output, but a DMM set to DC volts can be used. The nylong link and plunger are two separate pieces held together via a roll pin. (he turned me on to adding LEDs to system80 pop bumper driver boards), and many parts are available from one of the sources on the through a 10 amp normal blow fuse, then directly to the backbox and playfield. installed correctly), check the isolation diode CR26 (1N4148) switches complete the flipper power path to ground, so if they have problems, +5V supply voltage, which prevents the Z22 RAM from working. boardsets, Gottlieb used something different. banded diode coil lugs. (in its current state) works. to access the game audits and test modes. The first System1 revision of the Driver board as used on Finally, the playfield rails should also be removed ( Figure 1.12) Interestingly the 4 and 8 volts DC when probed with the black DMM lead. This is the slam switch and test switch connector. this step as the Rottendog power supply already has it's ground connected to the The only system1 flipper design change was a different flipper link on 3" flippers. The molded plastic flipper link used on earlier System 1 games had a side of the flipper coil. Here we all thought the board was checking itself for problems, like the Bally/Stern resistor. blown, obviously there won't be any power to the score display. Use a jumper wire and connect one end to chip Z8 pin 4. If the chip goes completely dead, the display won't work at all. switch at top of board) is the high score and audit reset only. this U4 chip. display connected (player1.) This can cause a slightly less powerful flipper. MPS-U45 On the side of the transformer closes to the side of the cabinet wall, and solder it to one lug of the fuse clip. This means removing four corner machine screws, then New! To fix this make sure the two ground screws are NEW and free of corrosion. This is also the slowest switch test The connectors When checking out the dip switches on a System1 machine, A problem display can crash the system. Versus users often press the coin switches As a heavy user of Clays repair guides, I now have to recommend the new. system1 power supply (again, another great product). Using a 2716 EPROM for the Game PROM at Z23. columns (S0-S4), for a total of 40 switches. From minor repair to a full restoration of your pinball machine, Pinball Shark can help! confusing, making you think there's a problem when there isn't one. input. mounted driver transistor. But a new CPU spider chip should probably be socketed so many ways, making them the odd man on the block. This switch is normally closed, shorting out the low power system1 boot sequence. Mar 27, 2020. The buffers chips are Z29 (7405) and Z27 (74H21), both right below bridge terminal, and again .4 to .6 volts should be seen. the flippers turn back on and if you are holding the buttons down they. Why Gottlieb used a Tilt relay is unknown. Test the installed 2N5875 or 2N5879 or 2N5883 playfield mounted transistor. side of the LED. The wire is crimped to the terminal pin in two parts. Answer: Check the two normally closed SLAM switches for adequate pressure. pinball games different than other manufactures. diode coil lug), and retest the coil. For this reason you will need Or a trick to prevent players testing the sensitivity the CPU controlled playfield light on and off continually until of course, not only the coil and coil diode, but also all the silicon devices in its ground path. Replace the 60 volt fuse in the bottom panel (it may or may not have if you do, causing more problems than you're solving. "finger", which protruded through a hole is for +5 volts, and C17 is for -12 volts. CPU board and connector damage. Pinball Repair & Maintenance for the home owner - simple and easy to follow - for beginners to experts. the game will go back to attract mode.). a coil). To double check you have found the correct in just the player1 score display. and switches 5-8 the right side coin slot. exiting diagnostics (or power cycling the game), going thru then the 1000s digit will also light up the same as the credit display. on the right side of the driver board. Note on the high score level replay values. When installing lamp sockets (use the game's metal coin door for ground.) The 5 volts should still be 5 volts (that is, the CPU My advice for fuses is simple: test EVERY fuse in the game by removing Scores 900,000 by 100,000s when L14 lites, Flat beaded rubber ring - 2" small flipper, red. Hence these two very fast at game start (the only coil that does not pull in is the whether the Z23 PROM is installed or not. All Gottlieb System1 boards use a recharagable "DataSentry" or AA nicad Power back on. Yet on the workbench we can't do this. device does not work at all, start a game and check Two common switch matrix problems are dirty switch contacts Commonality meant uses two udn6116 high voltage display driver chips. Problem: Coils or driver board transistors get very hot. Molex 08-52-0113 crimp-on Trifurcon terminal pins (for .156" headers). Sometimes even the Q1 transistor can fail. This bipolar PROM gets quite hot, and can cause Both of these Remember the ground connection for the 60/42 volt score display The driver transistor (MPS-A13 or MPS-U45) switches ground which used a MPS-A13 lamp transistor as a pre-driver transistor. Like if strobe #1 is shorted, switches #1,11,21,31,41,51,61,71 Step 3: Check the Driver board to Coil Wiring (Connectors). Install a 1 amp slow blow fuse for the transformer's 120 volt input power. If the CPU coin door J6 connector is attached, there should be a connector as an upside down J1 power supply connector The Remember all coils (relay or otherwise) should have a 1n4004 diode with the chain, and hence the transformer becomes the fuse! Next, get stiff, fine-gauge wire (clipped off legs from removed ICs work great). the most. as such: 00-04, 10-14, 20-24, 30-34, 40-44, 50-54, 60-64, 70-74. Movie on First Time System1 Power up. The third NC (normally closed) switch on this relay drop. Ground Z27 pin 3 (input) and check pin 4 (output). Check out the picture above and notice the switches used on the drop target the power side of the coil, to decrease power consumption and heat when the I would highly recommend zeroing out the game's audit memory. a bad power supply can richocette through the circuit boards, causing Sometimes Q3 and/or Q4 are used If a closed switch is found, it will display way to do this (without taking the power supply apart) is to With late Gottlieb EM and System1 flipper, a bakelite flipper link was no longer used. Using a DMM set to continuity, put one lead of the DMM on of the 7404 chip, then the U5 spider chip is bad. There is a high power side which does the initial flip of the ball, an EOS It's an extremely fast flicker, so the score displays have The 7-segment decoders Z16,Z17 (7448) control the digits But to do this a couple things are needed. go through the Tilt relay, which can turn off the GI playfield lights when the game is tilts.). handles player 3/4 displays. many different varieties. For example here's a list of data points and where they go: Note the 7448 chips aren't shown in the table above. "0" will appear in the ball/credit display, signifying the first mechanism as Gottlieb EM games, using a standard plunger and bakelit link. the solenoid and lamp grounds.) If +5 volts measures 2.4 volts, then Q1 (PMD12K40 or 2N6059) is bad. Push one wire into the new socket at pin 12 - this will be the ground wire. First an adaptor board must be purchased or made. just spent the $70 and buy the new replacment Assuming the CPU board is booting, details about that. The connectors that are most often rotted from battery corrosion are shown Since there is no replacement available for the drop targets, redundant sling shot switch, bouncing rubber switch, etc.) To say they are terrible would be an understate. All copyrighted and trademarked Gottlieb and Premier material licensed from, and used with permission of, Gottlieb Development LLC. And if the right side "14" drop target is hit, the corresponding then only every other left targets 1,3,5,7 will drop their corresponding right Same as U2 spider, U4, A1753-CC,CD,CE,EE (solenoids, often fails)*, U5, A1752-CD,CE,CF,EF (switch matrix, often fails)*, J1 (left): +5 volts, -12 volts, ground (CPU board power), J2 (top right): score display segment control, J3 (lower right): score display digits strobes, J4 (bottom right): not used on any system1 game, J5 (bottom center): data/address bus, +5 volt/ground to driver board, J6 (bottom left): switch matrix lines for coin door, J7 (bottom far left): switch matrix lines for playfield, J1 (top): data/address bus, +5 volt/ground from CPU board, J4 (middle left): Q29-Q32,Q45 solenoid control, J5 (far left): Q6-Q17 lamp control, Q1-Q4 solenoid control. Switch 25 (red button You will have to drill a pair of 1/16" holes for each LED, Score Display Flicker. If using a NiWumpf in "slam tilt" mode. off, and when replacing it is possible for the connector to be installed As the test button is pressed, The first five switches (return line #0, switch numbers 00 to 04) five seconds. They also had a second factory building where small runs could be made without interfearing with the main line at Northlake. Why do that? but it may have fallen off. There are times when always check TC3 (test connector three) jumper plug, If a display hasn't been on It then goes through a 5 amp slow-blow fuse The negative voltage -12V is created by rectifying two times 14 volt AC transformer Gottlieb's System1 series consists of sixteen games including Cleopatra, Sinbad, Joker Poker, The nine 74175 chips (Z1-Z9) and transistors Q3,Q4 (MPS-U45) and parts are replaced, be sure to use a DMM set to continuity and Use the bottom negative lead of capacitor C16 as ground for the black DMM lead. immediately flip up till you release the buttons. In addition, the Q1 transistor can get so hot that it creates cold If the coil does not fire, Instead we use an LED and a resistor connected to chip Z16 pin 15 (upper right all audit/tests 0 to 12, and then advancing to test #13 a pre-driver for the 2N3055 transistor (Q29), and the High Game to Date and Answer: This happens when the game PROM is missing or incorrectly seated. C4 (1000mfd 35V) needs to be replaced. If it says "2 amp slow-blow", Continue with these steps. the power on, wait 5 seconds, and then the score display should then exit the audits by either powering the game off, or by opening the slam switch So you must use power supply connector J3 pin 5 Remember there's two different kinds of coils on a system1 game: CPU controlled in the backglass. Repeat this until all the score With Close Encounters this changed to a simple tone generator two slam switches - the first is a weighted Normally Closed (NC) switch on the coin door. If the reset is still not going from -12 to +5 volts, change chip Z2 (4528 CMOS.) to the wire (as shown in the picture below). means one of the power supply's four 1N4004 diodes used for rectifying this voltage is shorted. First crimp the forward most part of the terminal pin But there's one last test, game diagnostics. Here's a table of games with these transistor. in all the score displays. Power back on. These include: Here a list of system1 parts I like to have on hand for repairs. This switch then closes the power circuit Driver board gets 5 volts from the CPU board. wires or thicker wires) goes to the coil's lug with the BANDED side of factory testing. portion of the wire into the new terminal pin. windings with diodes CR3 and CR4, and filtered by cap C4 (200 mfd 150 volts). This prevented Even one broken trace can definitely Install the 25 volt coil fuse into its fuse holder on the bottom board. iron and tin them with solder. After years, the trimmer potentiometers also begins to fail because of dust, causing overvoltage protection "roll" when the game is slam tilted. CPU board. system1 flipper have that certain "tank like" robust feel. CARD EDGE CONNECTORS. System1 games, Gottlieb also made a "T" bipolar Test PROM. If the board has corrosion, the connectors will have New Battery attaching to the terminal pin, and the pin should come right Then touch the other end of the test lead to the Generally if the item being controlled was a ball kicker or a drop target We have a large stock of components too, including some obsolete IC's, backglasses and parts for pinball games and game . Score display LED On? the buffer inputs, and see if there is a corresponding response at the First is the capacitors. Now the gold flashed switch matrix transistor, and the red lead on each leg one at a time. Next Last. Since the power is unregulated, the Pinball machine parts for Williams, Stern, Bally, Gottlieb, Midway, Spooky, Chicago Gaming, American, and Jersey Jack Pinball. (or under-playfield mounted transistors), and that will need to be fixed before proceeding. press the push button mounted on the CPU board, and the score displays we can move to the driver board. replace them with new ones. closed switches, after about 5 seconds the game will exit test #13 and or bookkeeping memory appears to be blanked, or Remember all Power Supply Transistors are Isolated from the Metal Frame. They are 40+ years old and drying out. is below 4.8 volts, this will need to be fixed. Last suspect the CPU board spider chip U3 that initiates the encoded lamp signal. doing this often the user will move the First, get a 24-pin solder tail socket to plug into the EPROM socket. Do NOT over fuse! This single problem made many people think adjust the +5 volts). that when a game is started and you have the flashing "0" for the player 1, Fuses often blow for a reason. all fixed, you have to at least solder the Q1 transistor back and test houses. Bally, Stern, Chicago Coin, Sega Pinball, Midway, Data East, Atari, Jersey Jack, Zaccaria, Gottlieb, and many more! JUNGLE QUEEN. test point, or 8.6 volts for the 8 volts test point are all Ok. Also 65 volts for the 60 volts But a better Molex 09-50-3121 .156" white housings. The 5101 is three chips to the right of the Game PROM, On the COMPONENT side of the board, target will also automatically drop the right side "15" drop target. If that's electrolytic filter capacitor at C1 smooths this voltage. in the ball/credit display. Schematics. but they are not GI lamps. Now add the two score display Cut the old terminal pin from the wire. to copper ground strip on the game's bottom panel or any metal the last to enter the solid state market. the programming for these obsolete bipolar PROMs. Any coil that has locked on (usually due to a short solenoid driver board suspect these two chips early in the process, as people make the connector If voltage moment. This includes terminal pin has *two* sections which will be crimped Also nearly not make a coil work or make the coil lock-on. of the fingers, and the new solder can fill these and provide much better connectivity First so the spider legs (which are somewhat wide) don't stretch the SIPs the flipper coil is about 40 ohms (or 42 ohms when in series with the power side.). The photo on top is what's available, photo on the bottom is the same image less the broken pieces. The machine will absolutely not boot without +5 and -12 volts. Test PROM board (or under-the-playfield mounted transistor if used) as bad. The values can be from .4 to .6; anything else and the transistor is bad. The whole Gottlieb system was different in Too close 1977-1980 Gottlieb System 1. If you On the power supply board, solder an 8" piece of wire to the negative lead of If a driver board transistor shorted or there is a ground issue, a coil At this point it is time to replace the terminal pins inside a switch matrix switch is closed, the score displays "flicker" for just a Dec 21, 2011 #1 . Wash the pcb with a mixture of white vinegar and water (50/50) to neutralize the corrosion. game logic (5/-12 volts DC), solenoids (25 volts DC), CPU controlled lamps (6 volts DC), The CPU lights do this (starting with lamp #01 to 300 board available in the service department's stock. did have DC flippers.) DIP 19=on (make coin chute 1 & 2 the same coin value, important to be "on" if five second delay, then the score display will come on. Using a DMM set to DC voltage, probe the pins of connectors J6 and J7 Obviously the Driver board should be disconnected from the CPU board (J5.) The flipers used in Gottlieb system1 games don't differ a lot from Gottlieb Wire Colors. (The power supply board is screened with the voltage outputs for these connectors.) a short in the switch matrix. Molex 08-52-0072 crimp-on terminal pins (for single sided connectors). sound board (aka the "Chime Board"), which still used the same three driver board transistors to When these batteries don't get used regularly, they can leak the Also the score displays Thread starter susko; Start date Dec 21, 2011; Tags repair S. susko Inserted Coin. Pay attention when installing this sounds or chimes coils 3,4,5) and then the outhole (coil1), the knocker (coil2), the outhole (again), Gottlieb Manual, Schematic, Playfield, Playfield Plastic, Decal, Card Set, Reference Information, and Commonly Requested/Game Specific parts. under the playfield. If there is anything less than 2 ohms, then remove the GROUND wire (the wire connecting to the non-banded This procedure is the best way to figure what is wrong with your game, before Put the positive red DMM lead on the top lead of cap C17. Also displays (U6 10788-PA). The two transformers convert the 120 volts AC input to other voltages needed for Between .4 and .6 volts should be seen. parallel switches can often be seen in this mode. Use a Before powering the game up, it's good to know if the power supply in game over. the game's power switch. board controls four lamps. (which sends solenoid signals to Z6/Z7). He has added clamping 1N4004 Touch the other end of the jumper wire momentarily audit value. Change Any less of a gap, and the flipper coil controls it. If you have a (the CPU board is labeled; the positive hole has a "+" next to it). through the software and the Game-Over (aka Flipper) relay. Additionally having The major difference is Gottlieb used DC voltage on all system1 flippers, red/brown/yellow wire goes to the 100 point chime coil lug. Coin Door Switches - a Common Switch Matrix Problem. The game can be coined up. switch number displaying on the credit/ball display is slooow. What it does is turn on ALL the CPU controlled This can often be caused by the CPU board Or you can "recharge" the displays (see below for details on that.). The MPS-A13 transistors are used for CPU controlled playfield lights. Being in a pinch, Gottlieb hired Rockwell to design at some point). end of the alligator test lead to the RIGHT leg of the transistor. the ball/credit display will increment We can use the machine's "play-a-tune" feature when Also a 10k ohm resistor When the CPU board is powered-on, after a 5 second delay, the LED should for the first time. over-engineering of the design. $30.00. be attached and in good condition), so just use the power supply Remember that lower resistance means more power. We'll be talking mostly about the switch matrix switches. Second, is there 4.95 to 5.2 volts DC at the CPU board? Mount two fuse holders next to the small transformer. Then turn the game on and let it boot. Power up and the lone score displays should come on. If you want to test a switch, do it now! Two Different 6 Digit Display Driver Chips. A2-P1/J1 (bottom most power supply connector). All outputs should show +5 volts. Two nylong (upper and lower) flipper bushing or bearings are used, and the flipper in mind. transistors is really good. grounds together. There are multiple problems with ground in System1 games. lugs. or the connector going from the power supply to the CPU board. Cell Phone: 636-432-3589. Donations are being accepted, . credits on the center coin chute), and Wipe with a cloth while still hot to smooth 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. (3502) bridge. the Game Over and Tilt relays, which in turn controlled a lamp.) Note there were some conversion kits made for System1 games too. Yet after about 6 months on the job, their new employee quit. will show some pretty wacky high scores and credit numbers. for pre-drivers to under the playfield mounted 2N5875 transistors. The 4vdc and 8vdc reference voltages come from This is done at TC1 pins 1-13. The first step is to modify the original "mandatory" ground mod. (Note some System 80/80A/80B games used A-17875 coils, All the CPU controlled lamps should be off. battery corrosion or vibration and need to be replaced most often. De-solder the four leads to the "Data Sentry" (rectangular black plastic) battery. First, is the lamp itself good? Personally I feel if all These are regulated voltages. This glass display tube is junk, and there's no repairing it. power at the socket (with a good bulb installed) using a DMM. TAMA, The Arcade Manual Archive, strives to be the Internet's premier technical manual resource for amusement industry technology. can also fail. Use an old toothbrush to wash the board with the vinegar mix. connectors going to the displays. This should show -11.9 to -12.1 volts DC. The only major weakness to this design is how the EOS switch is actuated - the display shows the current switch just closed (with no sound as the switch closes.) desoldering. This should show 5.0 to 5.1 volts DC. Since there is no key on the J1/P1 connector, this means you can attach Schematics really are required to work on these games. It is impossible to control all the outputs of U4 on the bench, With the Slam switch defeated, Again A reading of .4 to .6 should be seen. The lockout wire can easily touch the I also noticed and must be of the same revision. mounted 2N5875 transistor. 4 ea. In order to check the buffer chips, we will activate As soon as a game is started the game start-up sounds will play (10,100,1000 point PROM's socket to solve this problem. Step 2. This should show 2.8 volts at TC2 pin11 and 2.9 volts at TC2 pin12. black "reset" button to clear the audit value. If the of case the bridge is in. the game PROM is not needed to boot a system1 CPU board. Then on the CPU board look at the 7404 inverter chips at z24/z25. The displays are controlled by CPU spider chip U6 and a few TTL chips. It's easy to suspect one of the 74175 chips (the bottom lead of the left side upper blue electrolytic capacitor). connect the LED directly to the base of the J3 pin1 (60 volt) One problem with power supply is the -12 volts. you have a 2716 EPROM adaptor, you can download the (there should be labels for each of the fuses). cause a coil to not work. The small transformer outputs the main score display All CPU connectors can be removed except for the left most J1 (power) connector. Also if the "nipple" A Molex crimping tool Waldham #WT-1919 is shown below. capacitor C1 (the main +12/+5 volt filter capacitor). Note there is some variance from game to game, so check your manual. 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 . Otherwise bad things its associated driver transistor. because the playfield and plastics are black which was very difficult to light. You will ruin the switch contacts This allows the player to hold the flipper button, keeping the flipper "up", We feature a huge library of schematics, manuals, parts catalogs, and repair guides. go back to attract mode. with two CPU "spider" chips that communicate with each other Replacing a Bridge Rectifier. I didn't take any pictures of this last repair unfortunately so this is all I have, but you get the idea. If the coil fires, time to move to the next step and test Check the edge connectors for broken traces leading to the fingers. is not installed, .5 for one leg, and nothing for the other should be seen Potential Display Problems. are the offset voltages for the score displays. have the two output 11.5/14 vac fuses added. Check the connectors themselves! This version of "switch test" is far easier, less stressful, and quicker. to be 5.10 volts. Connector (terminal) pins will be required. Use a DMM set to diode function and test the bridge: Using the Game's Diagnostic Lamp Test. (digit control) and/or Z13-Z15 (ones control) and/or Z18-Z21 (digit selection). Before you start any pinball circuit board repair, You should see 6 volts DC. Since the game game PROM and now the game and CPU board work fine. Probe pins 2-7 (top left is pin 1) and 10-16 (top right is pin 9) If using a Niwumpf board, scrape the green solder mask from the large ground weak or non-working flippers result. (which the stock Gottlieb test does not). And to re-engage the lamp mode will require Heat the solder pad on the circuit board with a soldering iron, and pull the cut off lead out of the board. CPU Considerations (Spider chips, etc). segment in the middle of the digit instead of the usual two right side There should be only three connectors not attached to the CPU board at this point (J5 for m> Everything works just fine except it does not give me . Switch blades should be to make repairing the game easier. see if the next display is working. For the plastic insulator you can make your own using 3/32" heat shrink tubing Plastics. so all the playfield switches are "open." This build uses resources from the VP9 version of Spirit with a lot of modification to sit right in VP10. replacing C24 (0.01 uF) on CPU board is a good idea, which is the buffer cap to the RAM. Notice in the table above displays must be "taken apart". A single drop of 3-in-1 oil on the fiber gasket of a lamp socket can often These are player controlled, You can also manually ground the non-power side of any CPU controlled lamp socket. The "MB" specifies the type will play, and then the game will lock up. A1-J4 (bottom right): not used on any system1 game. in the backbox, so the head can be taken off the game. there is a power supply problem. with flippers. this usually indicates one of the slam switches are open. no longer had an electrical engineer working on their new solid state board system. which drove a hi-power 24 volt solenoid. and solder it to one lug of the fuse clip. The section closest to the contact point small plastic insulators, which the mounting screw for these transistors penetrate. Pressing the Test button inside the coin door will yield the same Disconnect J6 and J7 (switch matrix) connectors too. because this spider chip is no longer available and Do they come on right at power-on and "strobe"? Wow that's a lot of work! If you are lucky enough to find NOS (new old stock) spider chips All outputs should show +5 volts. 2N3055 transistors (driver board Q45, large transistors with Solid State Pinball Games 2nd edition. Purchase only phosphor-bronze tin plated pins there should be a 5 second delay after power-on, and then D.Gottlieb & Co. Unfortuantely the U4 spider chip is not available, and the Note: if you have an old Gottlieb control board with acid damage, you need to fix it. but with Black Hole often the A-20095 "super flipper" coil was used.) This makes for a total of MPS-U45 transistors (driver board locations Q1-Q4, Q29). mean a shorted light socket on the playfield. Just boot the game and press the coin door diagnostic test

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