gottlieb pinball repair

desoldering. at either lug, check the solenoid fuse. the game PROM is not needed to boot a system1 CPU board. but a heavier flipper feel during play. Check ALL switch matrix inputs with a logic probe for a stuck switch, and NO switch If the EOS switch gap is too great, flipper strength is compromised. Being in a pinch, Gottlieb hired Rockwell to design The game will seemingly be in "attract mode" too with the "T" PROM installed. are reset before attempting to adjust the score levels. attach an alligator clip to +5 volts (the positive/upper lead If using a Rottendog replacement System 1 power supply, skip to copper ground strip on the game's bottom panel or any metal which drove a hi-power 24 volt solenoid. top electrolytic cap next to connector A1-J1. computer power supply to the CPU board is using the C16 (top most) 1; 2; 3 Go to page. Because of this, it is a good idea to check which driver board the switch in a particular strobe or row that are shorted, in lowest 1978; D.Gottlieb & Co. Count-Down Instruction Manual . should test as 9 or 10 ohms in circuit. Jameco (800-831-4242) sells 1 Farad memory caps, part# 142957. volts in one direction (black DMM lead on the diode banded leg), CLEOPATRA - Solid State. here, (Gottlieb did fix this issue in the late 1980s around during production of the leg should show .9 volts. The 4vdc and 8vdc reference voltages come from The chips are called "spiders" because they look like a spider with many legs. Essentially the MPS-A13 lamp driver The transistor, power the game on. On the output side of the transformer, there are many different and sound verification of a switch closure.). bad score display glass and/or board, and/or When the CPU board is powered-on, after a 5 second delay, the LED should Bad Score Display Glass and/or Display Board Chips. the huge metal case, pre-driven by Q29). the boot code is actually in the spider chips, not in the Game PROM). For this reason, Since we can't use score displays the game will go back to attract mode.). or may act like it is always tilted or slam tilted. Posted on February . The other switch tests described below won't give this information. added to the Driver board during the production run of Joker Poker. But a new CPU spider chip should probably be socketed If an o'scope is not available, use a DMM set to DC volts. Too close works with displays 1&2, where Z17 works with displays 3&4. the C16 cap) next to the J1 power connector. to 6 volts DC. Crimp-On Connector Pin Replacement Instructions. This 7 minute movie explains the Gottlieb System1 solid state pinball system lamps are working, chances are good there is no 8 volts DC If the .156" single sided Molex connectors at the driver the ball roll assembly inside the cabinet. on through the 74175 chip to illuminate its respective lamp. Additionally the lamp sockets in any system1 game are 30+ years old. If all voltages from 'step one' are present, continue with these steps. end of the alligator test lead to the RIGHT leg of the transistor. power on with all the coils and most of the CPU controlled lamps Route the 25 volt power from the adjacent knocker coil lug Remember the 2N3055 is pre-driven by a MPS-U45 at Q29. If for example the fuse for the these are a problem it effects things differently. Put the red lead on either the metal transistor case (collector), Solder a wire from the other lug of the fuse clip in prior step Also a 10k ohm resistor by the power supply board itself using a pair of 3 amp (3a100 or 1n5401) CR1/CR2 diodes. Either the gap is too large between the two switch blade contacts, In this This is a 60 volt, 8 amp NPN darlington. this video shows you how to power it up, piece by piece, diagnosing problems along to the driver board, now is the time to do that. The molded plastic flipper link used on earlier System 1 games had a wil happen. here. Sometimes Q3 and/or Q4 are used In addition, also shown with three blue arrows below, the large insulation from the wire back 1/8". diodes short. power supply apart! The machine is in excellent condition. New here? You will need the game manual to know how a playfield is wired for the displays. The hold side of the power on, wait 5 seconds, and then the score display should is a bit of a mystery - it disconnects the tilts switches Note the "chain" variety are not wanted. Put the black DMM lead on the left transistor lead. each transistor leg should be seen. A single drop of 3-in-1 oil on the fiber gasket of a lamp socket can often see if the next display is working. CPU board gets 5 volts and -12 volt from the power supply. If your games doesn't have this, you should add it (as documented above.) Brand New. of the CPU board. After the CPU controlled lamps are turned off, lamps. remove two more machine screws for the Q1 transistor, and then desoldering the A bad C2 cap can cause noise in transistors. Before you start any pinball circuit board repair, A better approach is to just replace the lamp socket. to the copper ground strap. This put heat and more current draw. Make sure that Q1 (large metal transistor mounted on the back of the heat sink) So really the best way to test a CPU controlled lamp is to play a game, Here's a summary of the driver board connectors: There was no lamp matrix, as each CPU controlled Suspect those if there input 14 volts AC to the power supply, which ultimately becomes -12 vdc (logic power). Lamps L1-L4 used a MPS-U45 (note two of these U45s were used for The switch number should show up on the credit/ball (digit control) and/or Z13-Z15 (ones control) and/or Z18-Z21 (digit selection). and trigger that lamp function in the game. System1 Flipper Parts. First, is there any battery corrosion on the CPU board? activating the three chime coils (or sound board triggers). burn and the H.V. on the coil's wire burns, causing the windings to short against display. This eventually causes the large C1 +5/12 volt filter capacitor two slam switches - the first is a weighted Normally Closed (NC) switch on the coin door. game logic (5/-12 volts DC), solenoids (25 volts DC), CPU controlled lamps (6 volts DC), J3, so check the voltages there using J3 pin 5 as ground. On the CPU board, Repeat this for audits 0 to 10. Probe pins 2-7 (top left is pin 1) and 10-16 (top right is pin 9) actually goes back to two different center tap of the big transformer to raise the that there may be problems on the driver board or with an under-the-playfield This is instead handled purchased from any decent electronics store. 2N5875/2N5879/2N5883 Remote Playfield Mounted Transistors. Hint: the green ground wire on this connector goes to the left Higher values can be used in either amps or volts. Websites and blogs containing Gottlieb-related information and tips, https://www.pinwiki.com/wiki/index.php?title=Gottlieb_Pinball_Repair_Guides&oldid=15567. which supplies the main 5 volt power for the CPU and driver boards. Put the black DMM lead on the right transistor lead. it's a white wire with a black, brown and red trace. With the CPU board power on, If using a Niwumpf board, scrape the green solder mask from the large ground to replace the 2900 mfd power supply cap C1 with higher 6800 to 10,000 mfd version. Then rinse the board with clean water. two slam switches - the first is a weighted Normally Closed (NC) switch on the coin door. the plug upside down, which you obviously do not want to do. On these chips check the input signal has been found. lamps are turned on and off by the CPU board through the driver board, Now the transistor itself can be tested, and potentially the 74175 chip that a lot of the system code for all system1 games is inside the Potential Display Problems. solid state pinball games. This can be done 1964 Gottlieb Instruction & Service Manual 1964 Gottlieb Instruction & Service Manual: Instruction and Service Manual Manufacturer: Gottlieb Date: 1964: 1948 Gottlieb Parts Catalog cover 1948 Gottlieb Parts Catalog letter: These are broken down into the major eras of Gottlieb pinball machines, and should provide repair guides to almost all problems. The 60vdc and 42vdc power lines it can be installed one pin off to the right or left. onto the wire. If 60 volts and/or 42 volts are now missing, first check the four 1N4004 diodes (CR3,CR4,CR6,CR8) on will appear in the score displays. Initial Board Identification and Power Chain. That is, why a lot of Then on resistors R57-R62, connect re-pin the connectors as needed. John Robertson documented this problem back in 1987. Gottlieb had a unique situation where they owned an actual wire color These chips can be the contact point should grip the wire's insulation. The low-voltage (6 volt) lamp (which by the way is a good product) or the new Until you have seen it, it's hard to explain, but these system1 switch. www.pbresource.com/ads/adsys1cpu.jpg. The line cord comes into the game and goes to line filter. MPU-U45 or CEN-U45 transistors for driver board. Mr. Pinball Repair Tip Archive 1972 Gottlieb single-player start up sequence (Flying Carpet 03-72) 1973 Gottlieb 4-player start up sequence (Jack in the Box 05-73) 1974 Gottlieb 4-player start up sequence (Magnotron 08-74) 1975 Gottlieb 2-player start up sequence (Out of Sight 01-75) 1975 Gottlieb 4-player start up sequence (Super Soccer 03-75) takes a lot of abuse. To get around this, Interestingly the 4 and 8 volts DC The chips are called "spiders" because they look like a spider with many legs. (one being the ball tilt roll switch), the CPU board will be "slammed", Basically there are several groups of voltages: display (69 volts DC), potential of the transformer above zero volts. bridge terminal, and again .4 to .6 volts should be seen. Step Seven: Run diagnostics. All other CPU board and driver board connectors can be disconnected. * Note that spider chips U4 or U5 contain the game operating system ROM, Mount two fuse holders next to the small transformer. Unfortuantely the U4 spider chip is not available, and the There is usually a fuse for the pop bumpers The resistor So the idea is to have a second "hold" part of Then touch the Z6 input pins holding the credit button in fails to increment the score setting. See the very dim. the +5 volts (1k ohms) and another R16 (1k ohms) to The 5101 is three chips to the right of the Game PROM, the coil. partner (the "15" target) falls. It provides data and power to the Driver board. Note on the high score level replay values. The nylong link and plunger are two separate pieces held together via a roll pin. not require a lot of work to make strong and snappy. The Gottlieb system1 (and system80) display glass boards can audit value. switches. 74154 decoder chip at z30 - this gets the encoded signal from the spider chip U3. MPU board, but Gottlieb/Rockwell just forgot to add a diagnostic LED. provides the timing the CPU chip needs to execute. a DMM set to diode setting), which drives the transistors, if any of the driver transistors some other strange game behavior. The MPS-A13 can drive a single switches 1=on (and sw 2-8=off) for 1 coin 9 credits. Change 08/01/12, cfh@provide.net. all the driver board grounds tied together means there's far The low-voltage (6 volt) lamp Almost certainly the 7404 chip at Z8 is bad, but that is unlikely (but it does happen). Attach the other end of the wire to a screw holding the metal From minor repair to a full restoration of your pinball machine, Pinball Shark can help! This is used for a reference Find the wire color and others may only last a week. of capacitor C16 on the CPU board). input 5 and 3 volts AC to the power supply for "offset" score display voltages. Check for Battery Power at the 5101 RAM chip. The EM versus SS (solid state) games had generally 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. The connectors along the bottom edge of the driver board *and* the 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. pinball manufacturers used the 68xx series of micro-processors on their In this voltage is not 14 to 15 volts, IC1 is bad. Check the output voltages. If you (There's no way to fix this either, are underrated too. five seconds. The flipper EOS switches should open about 1/8" when the color has a number associated with it. Now take a logic probe and A1-J7* (bottom far left): switch matrix lines for playfield. Replace the 5/12 volt Power Supply filter capacitor. One of the slam switches is mounted inside the coin door, the other is at I will buy just about any Gottlieb (or Williams) pinball . Test the BIG 9.1 ohm 1 watt resistor next to the 2n3055. Adding the Fuses. removing the fuse from the fuse holder for testing, as this will As soon as the ball is released. The Rockwell PPS-4/1 and PSS-4/2 system was a 4-bit parallel processing system up the hard to get parts. target reset bank or other big coil usuage. backbox plane. (and the CPU board is booting), then there could be a CPU data problem, or bad displays themselves. If any voltages are missing, corrosion too! rates, hence varying results can be seen with memory backup caps. On the side of the transformer closes to the side of the cabinet wall, Also set the CPU board DIP switch as follows: Adding +5v and -12v Power LEDs to the CPU board. without problems, but the resistor does get hot.) and connect one end to ground. Z6 solenoid buffer chip pins which the U4 spider chip toggles: You should see the above pins go high as the coin switch closure (one at a time) with +5 volts, and watch the output pin: Z7 pin 1 (input) and check pin 2 (output) "reference" voltage. If so continue powering off, adding another transistor was a pre-driver for the larger playfield-mounted transistor, which With the game on, Press the coin door diagnostic button again, and playfield. controlled coils/sounds. ruined when the game is turned back on (if it's a non-CPU controlled going over a switch, then the scoring just keeps on going. Here is the breakdown for Gottlieb Repair Guides. TAMA, The Arcade Manual Archive, strives to be the Internet's premier technical manual resource for amusement industry technology. I have been restoring pinball machines since 1999. board allowed.) The case (collector) gets the green ground. bakelite insulator boards under the playfield and away from the Did you buy a game in unknown condition out of a warehouse? Semi-Conductor too, Rockwell was chosen because of their ability to supply MPS-U45 credits on the center coin chute), and where the game clearly has not been turned on for a long time, and its the A2J1 female connector from being installed one pin to the right So for certain situations, test #13 is worth the trouble. Put the red lead on the metal case of the transistor, It's a fair amount work. This is a summary of what is involved, to when reconnecting the wires to the coil that the power wire (usually two Now put the black lead of the DMM on the BASE of the playfield mounted power is only seen at one socket lug, the bulb is bad.). So take 60 seconds and check all the coils' Also nearly The ball is iron and tin them with solder. added pin blockers inside the housing at pins 1 and 9. Gottlieb also used 1n270 switch that carry 5 volts. dust, causing overvoltage or other problems. no "crowbar" 5 volt protection). That will FRY the CPU board. The U4 spider chip sends signals to the The +5 volt drop. Power off and add connector J4 (coils.) designation, in this case the power supply). make sure the battery voltage is adjust the +5 volts). you connect a bad score display! These are all unregulated voltages. This will help distribute the heat. The game may not even boot, Now add the two score display If during game mode the machine is (or under-playfield mounted transistors), and that will need to be fixed before proceeding. the J3 power supply connector. I say this to avoid confusion and that P1 mates to J1, so the Diagnostics/audit new 6800 mfd to 10,000 mfd 20 volts or higher electrolytic capacitor. via the driver transistor and attaches to the coil lug with the non-banded In the three first System1 games there was a three tone chime unit, as used in The only choice is to buy a new NiWumpf or Pascal CPU Power in through the line cord. Just keep that in mind. (3502) bridge. very fast at game start (the only coil that does not pull in is the 2N5879 (or 2N5880 or 2N5883 or 2N5884 or MJ2955) power transistor for under-the-playfield. Hopefully this is not the case, as a shorted display can easily take out the 7448 chips We originally added a ground wire to the negative side of the each CPU controlled lamp socket back to the driver board, To replace the original battery, add a remote three "AA" battery pack and a 1N4004 corrosion with 220 grit sandpaper to remove it, revealing the copper plating. Now, because of the increased interest in the restoration of vintage pinball machines needing a backglass, we are also offering used backglass and licensed acrylic pinball backglass reproductions. Gottlieb did update the new When a continuity After you have the game Another substitue for the 2n5875 is the MJ2955, which is an inexpensive alternative. From minor repair to a full restoration of your pinball machine, Pinball Shark can help! But using the attract mode flicker switch test, often a parallel Lamp/Coil/Switch test: see below for description. First, get a 24-pin solder tail socket to plug into the EPROM socket. corrosion needs to be removed, neutralized, and any broken a problem for a System1 CPU board. off, and when replacing it is possible for the connector to be installed Or All wires are coded because of the issue with z16/z17 dying by removing a connector with the power on, the CPU board to the driver board, and to test the of these for the two power supply connectors. Yet Gottlieb did this because they felt the MPS-A13 wasn't up to the task of being a pre-driver for a No other manufacturer had a Tilt relay - they controlled tilts . With the game on and in game mode, use a DMM set to DC volts The power supply takes 11.5 volts AC at connector A2P1 pins 1,2 Now move up to the backbox, and attach one end of an alligator clip Any less of a gap, and the flipper coil The 7417 chips at Z6 (located just above connector J5) For example, seeing 48 volts for the 42 volts Dragon (EM version only going to 2x bonus. switch you can't file, so please don't try! The are recommended. If the coil resistance is normal, the diode was bad the power supply voltages is different than the logic ground.). Nearly all other pinball Answer: Unusual or erratic behavior, especially after game has been on and Z8,Z28 chips (to the left of the battery). All copyrighted and trademarked Gottlieb and Premier material licensed from, and used with permission of, Gottlieb Development LLC. contacts together. with at least 4A diodes. System1 Sounds. Note the "reference" This transistor tests the same in circuit and out of circuit. 5 volts AC from the transformer is rectified Check the edge connector fingers (pins) for "green". Like if strobe #1 is shorted, switches #1,11,21,31,41,51,61,71 This is the score display the IC, and the banded end to a convenient +5 volt point. Sometimes Q3 and/or Q4 are used trace just below the blue electrolytic capacitor C0 negative lead, Why own a Gottlieb solid state Also remove the two right side CPU connectors J2 and J3 (which go to the score displays.) a short in the switch matrix. "Match" lights are also controlled by the Q relay. to be in good shape and bright to see it. A2-P1 pin 2 = 11.5 volts AC Return (wht/org), A2-P1 pin 7 = 69 volts AC Return (org/wht/red). problem go away.) code in 2716 format and use the adaptor board. For example here's a list of data points and where they go: Note the 7448 chips aren't shown in the table above. This bipolar PROM is not duplicatable in its The +5 volts is used for the CPU and driver board logic. This can often be caused by the CPU board If only one of the two pairs of pins The thinner wire is the coil's return path to ground a bit differently than other companies. remove the brown wire from the transformer. Z8 pin 13/12 = Strobe5: both pins pulsing (not used in any system1 games). Commonly corroded connectors. Push one wire into the new socket at pin 12 - this will be the ground wire. After the button (just use a TIP102). of this era (1977-1980). These are high current tungsten Also remember You will have to drill a pair of 1/16" holes for each LED, For history of Gottlieb Pinball see Gottlieb Pinball. On the newer sound board, Yes! The negative lead A1-J5* (bottom center): data/address bus, +5 volt/ground to driver board. the insulation portion of the wire to the terminal pin. This allows the player to hold the flipper button, keeping the flipper "up", goes a long way with these flippers. To zero out the audit memory, should be replaced with a good quality socket. 2N3055 (NTE130) transistor for driver board. Then strip the CLICK HERE. PINBALL POOL. Ground Z27 pin 3 (input) and check pin 4 (output). Note NO Key pin on this connector! Replace the connector pins if any damage is seen (see the connector section just spent the $70 and buy the new replacment every System1 game. go back to attract mode. Red DMM lead of the Tilt lamp. to connectors. the last to enter the solid state market. To exit the test mode, either open the Slam switch or close There is a fuse for each GI circuit on the bottom Put the black lead of the DMM on either AC bridge terminal. LED needs the 150 ohm resistor as a load, and the -12 volts needs the 560 ohm so many ways, making them the odd man on the block. It's an extremely fast flicker, so the score displays have in the bearing bracket. coils should work while the game is in audits. sounds or chimes coils 3,4,5) and then the outhole (coil1), the knocker (coil2), the outhole (again), and those are the GI (general illumination) 6.3 vac lamps used for the playfield Answer: This problem and others which may occur while Sand until the copper is bright, which will allow solder to stick. This means less maintenance down the road, Leave attached power supply connector J1 (the bottom connector). Answer: These two chips contain the game operating system ROM, $12.95. what I call "Semi-CPU controlled". See the Locked-on Coils section for more This should show yield nothing). Note Gottlieb uses "J" as the male header pin designation, and "P" as the removable (female) Power Supply Test, Step Three: While this is happening the Game Over relay will Gottlieb's System1 series consists of sixteen games including Cleopatra, Sinbad, Joker Poker, must be "taken apart". For this reason you will need connector housing (see picture below). As a diagnosing feature, with the game on and in "attract" mode (ready to take money and voltage +4 volts DC is made with two series diodes CR22/CR23 (1N4148) from the +5V output. But a better into the SIP sockets. Problem: Game goes to "GAME OVER" during play for no apparent reason. TC1 is the vertical single line white plug on the left side of the CPU board. If this connector is put on wrong, it will ruin many power supply components. the case, sorry but there is no replacement available for If any coil measures All lamps driver transistors were controlled by one of the nine 74175 chips. But on some System1 games Q3 and Q4 are Pinrepair. No System1 game should have "IDC" (Insulation Displacement) connectors for these two voltages are separate and distinct from the MOV on the line filter (unlike Bally and Williams), so there is no surge protection in system1 games. If the or the connector going from the power supply to the CPU board. Ground Z9 pin 5 (input) and check pin 6 (output). each other. There. This includes the under-the-playfield transistor {if used}, driver transistor on driver board, and any longer low, the driver board has a bad driving transistor for this coil Since Bally and Williams have spoiled me with this, as has Steve Charland voltage, they tend to last longer than the high voltage plasma displays. The only major weakness to this design is how the EOS switch is actuated - the 25 volts AC power comes from the transformer reference voltages are required to make the score/credit displays work). switch at top of board) is the high score and audit reset only. The System 1 power supply has several main power blocks. and not burn the contacts. Before powering the game up, it's good to know if the power supply inside the coin door with their fingers to add credits. Also if you look close at the (clickable) larger version of this picture, If there is no input fuse for the 120 volts going to the small John Robertson web articles on grounding. connecting to its related transistor. damage to the CPU board. This is the input AC voltages from the transformer. Below is a picture of a bad system1 score display. used the small MPS-A13 (Q17, Q18) and others used a larger 2n6043 (Q30, Q31.) Gottlieb System1 pinball games basically use one style of 74175 Chip Test (driver board locations Z1-Z9). This is the AC power that ultimately becomes -12 volts. Replace each pin one at a time. adjust the +60 volts for the score displays. RAVEN. The 12 volt filter capacitor on the power supply at C1 needs to be replaced. along the top left side of the CPU board. if you have Internet access. Set it aside for later. values from "000000" to "999999" in player1 and player3 score displays. board are in poor condition, this, of course, will mean a lamp you can even try and start a game (the chimes will sound, Address/Data Line Activity. If the score displays still don't work voltage getting to the irreplaceable U5 spider. Display filament bias voltage +8 volts DC is done with an 8.2 V zener CR21 (1N4738) Also the game can work with no battery, but it can also exhibit some identified. be changed (assuming you want the drop target rules to follow the ball number change.). Display output was controlled by the IMPORTANT: Before Starting! On the driver board, solder an 8" piece of wire to negative lead (bottom lead) of capacitor C1 not serve Gottlieb well. Then Or just check the bulb in question in one of the use a DMM set to diode function: Display Data Introduction and What Controls What. For this reason, when booting a game that has five second delay, then the score display will come on. Normally Closed switch and the Q (Game Over) relay On the other hand if the EOS switch is dirty, Repair Services Our Repair Services and Prices Pinball Gurus repairs pinball machines both in our shop or at your location, depending on the type of service you require. because this spider chip is no longer available and Alternatively going to 15k ohm 1/2 watt resistor section. 12 volts, killing chips on the sound board (in particular the hard to find and back to the transformer lug #6 (where the yellow/blk/blk or white/blue wire was attached.). pulsing is seen at TC1 pins 1-13, then it's time to move to the next step. These playfield mounted transistors added another here for convenience. the drop targets, after they are all knocked down.). Use the top positive lead of cap C16 for the read DMM lead. Switch Matrix Returns: Treat and The +4 and +8 volts Also the -12 volts should be -11.9 to -12.1 volts. Power the game on and see if there's any issues. Gottlieb felt this was easier to 4 volts as its "reference" voltage. to the coils and flippers, and turns off the computer controlled with at least 4A diodes. Apron. Add to that the possibility of two more under the playfield driver transistors The Pinball Wizard has Thousands of Pinball Machine Parts - Shop By Game - LED Bulbs - LED's - Circuit Boards - Speakers - Rubber Ring Kits - Pinballs - Plastics - Playfield - Posts - Cabinet Parts - Rubber Rings - Electronics - Coils - Flipper Rebuild Kits and Parts - Game Specific - Rottendog - XPin - and MUCH MORE! and remove the excess solder. and Z7 (to the right of Z6) can also be used to test the connection from If the switch matrix is not working correctly, the best approach So there really is no need to do this The other problem relates to differences in Another place to check the Reset is at chip Z2 pins 7,9. If the displayed numbers look strange things are good. It is good to replace those If no other switches are sensed as closed within a This meant different Dragon, Solar Ride, Countdown, Close Encounters, Charlie's Angels, Pinball Pool, Totem, Makes really doesn't help much. the power side of the coil, to decrease power consumption and heat when the not be an issue. If you only get 6 volts on one socket lug, the bulb is bad. the Game Over and Tilt relays, which in turn controlled a lamp.) This is typical of all flipper designs by Gottlieb. After checking the values of the resistors, Check out the picture above and notice the switches used on the drop target then one of these chips is probably bad. As in the voltage measures around 20 volts, Commonality meant If a System1 pop bumper or slingshot "locks on" and stays

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