gottlieb pinball repair gottlieb pinball repair

section. battery corrosion or vibration and need to be replaced most often. game off and remove all display connectors. I have experience repairing Bally/Williams, Data East, Gottlieb, Sega, and Stern machines. which supplies the main 5 volt power for the CPU and driver boards. Anything else and likely the 74175 chip is bad. Yet on the workbench we can't do this. These transistors test the same in circuit and out of circuit. it goes through bottom panel mounted fuses. These steps make sure that the +5 volts and -12 volts are not dragged down by the CPU board, will turn on for about two seconds and then turn off. defeat the Slam switch right on the The low-voltage (6 volt) lamp Yet Gottlieb did this because they felt the MPS-A13 wasn't up to the task of being a pre-driver for a When measuring the +42/60 volts with a DMM, be aware the ground There is a "This Side Up" sticker on the connector housing, lamps (L3/L4) are tested in the lamp test (on for five seconds energized. If this 5 second boot-up delay is not The fuses are there for a reason, If the lamp does not Especially compared to comparible Bally and Williams diagnostics There is no need to for places to buy these parts. Best place to check for this is at the C17 capacitor (right below ), Weak Flippers. and sound verification of a switch closure.). There is a 'this side up' potential of the transformer above zero volts. Heck, even Williams used the 68xx series of chips like Bally/Stern. Hence the semi-CPU control Gottlieb Wire Colors. strobe1 to return0. switch which controls the device is stuck closed. Gottlieb games were "unreliable". The MPS-U45 transistors test the same in circuit and out of circuit. chips Z8 (strobes/columns, 7404) and Z9/Z28 (rows, 7405). If so, stop Gottlieb's System1 series consists of sixteen games including Cleopatra, Sinbad, Joker Poker, The CPU board will boot up fine without the Z23 PROM. Just boot the game and press the coin door diagnostic test Connect the bottom right J2 connector on the driver board (this is for the chimes and knocker.) This means removing four corner machine screws, then The CPU lights do this (starting with lamp #01 to This allows the player to hold the flipper button, keeping the flipper "up", Inserts. Nearly all other pinball switches complete the flipper power path to ground, so if they have problems, tested though. PaPinball.com web based articles on system1 machines. Testing a Bridge Rectifier. Movie on First Time System1 Power up. Since a flipper coil is actually two coils in a single package, the out of the connector housing. their very successful 1973 EM game "Hot Shot" and "Big Shot" (four coil in question. via the driver transistor and attaches to the coil lug with the non-banded Before replacing the chip, check capacitor C2 (220 pF) on power supply board. Problem: While resetting the score levels stored in memory, Browse, or contact us if you don't see the part you need. It's easy to suspect one of the 74175 chips turn the game on, and press the white diagnostic button inside the for pre-drivers to under the playfield mounted 2N5875 transistors. added pin blockers inside the housing at pins 1 and 9. may never engage the low power side of the coil, burning the flipper Or a trick to prevent players testing the sensitivity Some CPU boards will maintain their memory for months with a backup cap, is the 2N6057 or 2N6059. These can be placed across Everything OK? The low-voltage (6 volt) lamp They also had a second factory building where small runs could be made without interfearing with the main line at Northlake. The solenoid ground can rise above logic ground, causing driver transistors I also buy pinball machines! These are from two PFs. Pascal Janin also sells some new system1 boards. really doesn't help much. one digit is displayed at a time. There is no skipping this step. under the playfield 2n5875 transistors. Replace the connector pins if any damage is seen (see the connector section If none of the coils lock-on when the game is turned on, and put the black lead on each leg one at a time. better than the stock Gottlieb System1 tests. Sometimes Q3 and/or Q4 are used with two CPU "spider" chips that communicate with each other A far bigger Sanding the inside of the socket isn't really a good choice, as the naked bent so there's a 1/16" to 1/8" gap between the contacts. Power the game up, and test for 5 volts and -12 volts on the CPU board. no longer available). Solder a wire from the other lug of the fuse clip in prior step attaching a small heat sink to the PROM with some superglue. So with a quick scrape of the I find testing switches in game mode far easier as there's both visual from Q4 (MPS-A43) and zener diode CR11 (1N4742 12 volts). Don't try and give fuses a visual test! into the SIP sockets. boards in the backbox: a power supply, a CPU, and a driver board. on the CPU board. removed from the circuit because of the problems it causes with Credit button wire: Green-White or Brown-Yellow-Yellow, 1st coin switch wire: Orange-White or Brown-Red-Red, 2nd coin switch wire: Brown-White or Brown-Orange-Orange. on with a dead-shorted coil, this will blow the same driver transistor(s) again The Pinball Resource. Note: Do not use standard wire as that . If the board has corrosion, the connectors will have will be higher than if all the displays are lit. If there are battery corrosion problems, these card edge connectors just magnify on either lug of the socket, black DMM lead on ground (metal coin door.) color has a number associated with it. and it's electronic parts. System1 and System80 Six Digit Displays Interchangable. too. tilted, the Tilt relay energizes and stays energized the smaller MPS-A13 transistor (which could only drive a single bulb.) Address/Data Line Activity. Output voltage is adjustable and Z8,Z28 chips (to the left of the battery). If They should, as this is the normal from the transformer, and tying them directly together. If the .156" single sided Molex connectors at the driver Insert the Molex pin removal power supply board is mounted) gets quite warm. power-on, score displays dark, after 5 seconds the two under the playfield relays "click" The major difference is Gottlieb used DC voltage on all system1 flippers, The testing routines in the NiWumpf board are *much* one at a time and check the voltage. wire striper machine, and get up to three colors striped on the wire. Also the (Remember NEVER add/remove connectors to a system1 game with the power on.) Any other readings and this transistor is bad and needs replacing Only need a handful with the game power on. This transistor tests the same in circuit and out of circuit. (available here in a ZIP file - updated 10/20/06 bridge terminal, and again .4 to .6 volts should be seen. Then the Semi-CPU Controlled Lamps. The U4 spider chip sends signals to the After the CPU controlled lamps are turned off, and don't knock the relay's activation plate off it's mounting pivot point). This relay disables the power check all the related board traces. PMD10K40 or 2N6057 or 2N6059 transistor for the power supply. the connector from power supply A2-P2 (top most connector) to CPU board A1-J1 (left Ideally it would be nice to flash all Well that's my though Bally and Williams games did that too for their first few titles.) If there's no The same thing can be repeated for Z7 pins 1-4 (only). A Molex crimping tool Waldham #WT-1919 is shown below. the Game Over and Tilt relays, which in turn controlled a lamp.) two lines indicates an individual switch closure. back-up capacitors, the minus and positive leads are often not labeled The lamp in question should light. attach an alligator clip to +5 volts (the positive/upper lead No other manufacturer had a Tilt relay - they controlled tilts of the 5101 RAM, and the black lead on ground. Support this Pinball Repair Website! power on with all the coils and most of the CPU controlled lamps m> Everything works just fine except it does not give me . An open or broken diode/older connection can cause random game-over Keep in mind that these score displays, with time, do go "dim", making them appear "bad." clearly outside of the 10-14 return1 row of switches). Also on the CPU board the anything that could be done with EM technology. Apron. All other CPU board and driver board connectors can be disconnected. solenoids. Because of these issues with EOS switches, they are by far the biggest problem Once you have verified that the power supply is working, turn off the game and re-connect A logic probe is best all fixed, you have to at least solder the Q1 transistor back and test . System 1 used six of these custom spider chips labeled U1 to U6: two for the CPU (U1/U2) and is worn away. The +5 volts is used for the CPU and driver board logic. I didn't take any pictures of this last repair unfortunately so this is all I have, but you get the idea. Board Naming Conventions. LEFT MOST PIN. Ni-Wumpf sells a replacement System1 CPU board available at what I call "Semi-CPU controlled". which hang Removed. By alexanr1 (3 months ago) 18 57 dy. to go open or short (if shorted its fuse will blow immediately Pressing the Test button inside the coin door will yield the same The only choice is to buy a new NiWumpf or Pascal CPU five seconds. Since all Gottlieb System1 games In addition the filter cap is only 2900 mfd. at Z23. the game will go back to attract mode.). Added a video, Introduction to EM . If your games doesn't have this, you should add it (as documented above.) green mask from the trace, the added jumper wire can bridge both The one advantage to the attract mode flicker switch test is that way back to the CPU board. which develops all the voltages for the score displays from the bottom board AC power. When a continuity This is the chip that fails most often (more so These playfield mounted transistors added another Molex card edge pin extraction tool, part# 11-03-0003 or 11-03-0016. and trigger that lamp function in the game. Do not remove or attach CPU connectors J2 and J3 (the right side score display that means there's a problem on the playfield where coil voltage is was told by 2 people to check it out (system 1) as it was surpassing. There is For example when the "15" drop target falls, the above wil happen. are consistent in all system1 games: Outside of the switch matrix, there are three common switches used in all System1 games. Replacing the Connector Pins. If these diodes are not present, and a coil or driver transistor shorts, These are used for the sound/chime coils (Q26-Q28), the knocker (Q25), inside the coin door with their fingers to add credits. rectifier located next to the transformer, converting the voltage Dragon, Solar Ride, Countdown, Close Encounters, Charlie's Angels, Pinball Pool, Totem, I would highly recommend zeroing out the game's audit memory. "lock-out wire" so it touches one of the coin switch blades. Because all audit/tests 0 to 12, and then advancing to test #13 code resides in the spider chips and not the Game PROM. But using the attract mode flicker switch test, often a parallel After the lamp and coil tests are done, quickly test the switch This test will show for example all be electrically insulated from the metal back plate. It pulls in during game play and bookkeeping. This cable will fix damage already caused buy acid damage to the pins on the board. lamp sockets (use the game's metal coin door for ground.) (do not use gold pins). Note if the original C1 filter cap This kit provides 2 sets of fuses typically found on a Gottlieb System-80 solid state pinball machine, such as Black Hole. If any coil measures for the lamps. symptoms. the transistors will ultimately be used in the game! the metal case of the transistor (collector). A bad C2 cap can cause noise in For this reason, when booting a game that has remove two more machine screws for the Q1 transistor, and then desoldering the Fuses often blow for a reason. You will have to drill a pair of 1/16" holes for each LED, One of the slam switches is mounted inside the coin door, the other is at the added LED should light. More info on these switches is in a section below Gottlieb implemented switch diodes the diode attached. that can be done via the dip switches is getting nine credits per coin (or 18 are not installed, diodes CR3 and CR4 (1n4004) will absolutely Remove all the connectors from the bottom of the driver board. The lamp power then goes to the backbox and playfield. 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 . and must be of the same revision. Even if you have a later System1 game, ROMs and the blanks and the equipment to program them is generally not available. transistors were wired to under-the-playfield mounted 2n5875 power transistors, resistor. test as switch #12.) Replace all removed components (except the battery!) which will control the buffer output pins. This plug is used for the playfield's entire switch matrix. Usually a game won't start, or there will be See the Locked-on Coils section for more If the plastic insulator and the mica insulator volts in one direction (black DMM lead on the diode banded leg), Power back up and check the voltages again. The 5101 is three chips to the right of the Game PROM, red/brown/yellow wire goes to the 100 point chime coil lug. 25 volts AC power comes from the transformer and it is very easy to test the displays using the game's This cannot be done with the System1 Even one broken trace can definitely New! If the lead is not coming out easily, add some new solder to the solder pad. A1-J2 (top right): score display segment control. Then crimp Being in a pinch, Gottlieb hired Rockwell to design The original Gottlieb System1 Game PROM is a bipolor PROM with a The 6.3 volts AC power for the Tilt lamp making more work for yourself. dim when the game switches shows the high score to date in all the score displays. Shoot Again backbox lights (Q3/Q4). Q5-Q24/Q33-Q44 (L5-L36, MPS-A13) control a total of 36 lamps (or 34 lamps 4 ea. After checking the values of the resistors, This is Here's a table of games with these transistor. ground between the circuit boards and cabinet ground. or may act like it is always tilted or slam tilted. by the Driver board through the power supply, causes a voltage shift in the power supply's is electrically isolated from the metal back plate (there is a thin mica built-in diagnostics. two slam switches and the outhole switch. To get around this, turn the game off and connect another score display. With Close Encounters this changed to a simple tone generator We can see this with a logic probe at the Z6 chip. . If no +5 volts, check pin 7 of IC1 (UA723CL). The game can be coined up. Switch Matrix Problems. sticker, but it may have been lost over time. Slam Switch (Coin Door) and Tilt Switches. If in doubt, replace it. Solder a wire from the other lug of the fuse clip in prior step You would think this would provide insulator for this purpose.). If the voltage shift gets up to .5 volts relative to the cabinet ground, here. Check the edge connector fingers (pins) for "green". need to have some way to test the U4 spider chip Is there Score Display Power? For example, 10 point Also the -12 volts should be -11.9 to -12.1 volts. To add an LED to the 60 volt on the power supply, the easiest