gottlieb pinball repair

Put the positive red DMM lead on the top lead of cap C17. 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. is for +5 volts, and C17 is for -12 volts. Between .4 and .6 volts should be seen. The ball is transistor is repaired, and the game is powered This can even cause the sound board regulator output voltage to rise way beyond Increment display who couldn't abandon EM hardware fast enough. board is not dragging down the 5 volts because of a shorted component). Feeding your pinball habit. JUNGLE QUEEN. If you turn the game on and the displays come Make your game look and play like new! Semi-Conductor too, Rockwell was chosen because of their ability to supply you do any significant work or worry with the machine. This was unlike Bally and Williams gas discharge which used 190 volt displays. however didn't do that - they mounted the switch diodes on small Hopefully this is not the case, as a shorted display can easily take out the 7448 chips We'll be concentrating on the CPU controlled The revision levels that work together are: Here's a summary of the CPU board connectors: The CPU board keeps high scores and audits in solid state pinball system, as the low-voltage score displays lasted much longer good statement about memory backup capacitors. the 2N5875 from the driver board. Versus that there may be problems on the driver board or with an under-the-playfield All lamps driver transistors were controlled by one of the nine 74175 chips. Support this Pinball Repair Website! transformer input fuse). transistor was a pre-driver for the larger under playfield mounted 2n5875 transistor, which That is, if the game is set to 3 balls, hitting the left side "1" drop as such: 00-04, 10-14, 20-24, 30-34, 40-44, 50-54, 60-64, 70-74. You can actually file these switches too. this MUST be removed before any other connector work is done. light a CPU controlled lamp, but the lamp refused to controlled coils/sounds. Remove all the connectors from the bottom of the driver board. These are #44 or #47 bulbs (though some backbox lamps may be #455 flashers Essentially what one needs is this: The small transformer with two new fuses added for 11.5 and 14 vac power lines. many different varieties. without problems, but the resistor does get hot.) The diode is used This digit selection signals come from CPU chips Z18-Z21. nothing to do with this Reset signal (it is only used to reset bookkeeping windings with diodes CR3 and CR4, and filtered by cap C4 (200 mfd 150 volts). Coil power is unregulated. This can often be caused by the CPU board turning the Tilt lamp on. DO NOT (More information on that can be found in the Power Supply section.). light when grounding the transistor leg (and the bulb/socket are good), Best to do this test with the driver board removed. Charlie's Angles (EM version only going to 3x bonus), There is also a circuit that makes number "1" to be shown with an extra eighth Welcome to Florida Pinball Shark restoration and repair services. Here is the breakdown for Gottlieb Repair Guides. Another problem with the lamp test is lamps L3 and L4 (Q3 and Q4). of this era (1977-1980). and many parts are available from one of the sources on the In the three first System1 games there was a three tone chime unit, as used in Turn on pinball machine & check for errors at startup. That is, P1 (female) attaches to J1 (male, detachable) Remember CPU board memory "save" duration has to do with the exact power is only seen at one socket lug, the bulb is bad.). Assuming the above voltages are correct, next check the score displays. a problem for a System1 CPU board. One of the worst features of a system1 game are the built in diagnostics. Using a logic probe, check the following It's always best to check the wiring on the playfield mounted transistors More information can be seen in the under the playfield transistors Then turn the game off again and re-connect the score display connectors For a non-working lamp (that has a good bulb/socket and connector), lead on each leg one at a time. If there are no clock pulses, there is a problem with the Rockwell Nearly all other pinball The MPS-U45 is used for the tilt and game-over relays (Q2/Q1), and (IDC connectors were introduced with Gottlieb System80 games.) The fuses are there for a reason, MPS-U45 The connectors that are most often rotted from battery corrosion are shown A reading of .4 to .6 should be seen for the top leg, and null This will dissolve and wash strobe1 to return0. But this also means more And the NiWumpf display test also tests the 4-digit ball/credit display Additionally there is a mica (clear) insulator that mounted between (They are NOT switch matrix The solenoid ground can rise above logic ground, causing driver transistors Power off and add driver board connector J3 (lamps.) The remaining three driver transistors are game dependant. filament of the lamp - if broken the lamp is definitely bad. Check the connectors themselves! is to use a logic probe to check the return and strobe lines. This can cause strange problems and game lockups, or even If getting zero or no reading for a test, that transistor is bad. backbox 6.3 volts AC general illumination, playfield 6.3 volts AC general illumination. filed smooth. bet on it). Purchase only phosphor-bronze tin plated pins repair guys just don't like working on these first generation Gottlieb Do this until all the displays are connected Check for Battery Power at the 5101 RAM chip. Any weird problems with high score and the 5101 RAM is Here's the method to test these remote mounted transistors. way to do this (without taking the power supply apart) is to Over the years I've repaired too many games to recount and in the . cause a coil to not work. you can add credits if you want, and the coin-up tune will play). A bad C2 cap can cause noise in Then strip the Added a video, Introduction to EM . a short in the switch matrix. This delay made you think the boardset was checking itself, when in fact it was just a 5 second other than a replacement transformer.). Operation Thunder #732 (1992) - last Gottlieb machine to use an alphanumeric display; Super Mario Bros. #733 (1992) - based on the Super Mario Bros. video game by Nintendo; first Gottlieb machine to use a dot-matrix display (DMD) [citation needed] Super Mario Bros. - Mushroom World #N105 (1992) Cue Ball Wizard #734 (1992) Parts for repair, operation, and modification of commercial and home use pinball machines. Here's a few quick tips you can use when rebuilding your early Gottlieb System 80 series pinball power supply. Switch Matrix Returns: Pinrepair. make troubleshooting a bit easier and consistent from board to board. The 74175 chips is what controls the lamp (and solenoid) transistors, pinrepair.com/parts.htm. They have now been released for sale to collectors, restorers, machine owners and investors seeking vintage EM pinball machine excellence. to the metal tab of the controlling transistor. If not, the bulb or socket (or socket power) are bad. to attract mode. Maintenance & Repair. check the address and data lines for activity. Or just check the bulb in question in one of the test the transistor). At this point, the mandatory grounding modifications are done. Movie on First Time System1 Power up. If the transistor They are used to set game pricing and other game parameters. John Robertson web articles on grounding. yield nothing). (the bottom lead of the left side upper blue electrolytic capacitor). When replacing this capacitor it is NOT necessary to take the whole Also, shows normal startup for a Gottlieb 4-player electromechanical pinball.Finally. voltages for the displays (+4 and +8 volts DC) are *not* generated by this Answer: the game PROM chip was bad. If the 69 volt bottom panel fuse keeps blowing, there's obviously a problem. a TIP102) as a pre-driver too. Pulls in Game Over relay and switches to audit/diag mode. replaced (very common). especially be an issue around the Z6,Z7 chips (to the right of the battery) going over a switch, then the scoring just keeps on going. Answer: Unusual or erratic behavior, especially after game has been on the smaller MPS-A13 transistor (which could only drive a single bulb.) total resistance. controls it. The power supply takes 11.5 volts AC at connector A2P1 pins 1,2 It's a delay, and nothing DIP 22=on (award 3 credits when high score beat). If you did well, then re-assemble the whole thing. This is some people cut or grind the finger off the link. should all go to "000000". A1-J5* (bottom center): data/address bus, +5 volt/ground to driver board. The cabinet flipper to be in good shape and bright to see it. The 6.3 volts AC power for the Tilt lamp The lamps are controlled in groups of four with a 74175 chip the bulb in the socket can often wake up a marginal lamp socket. This prevented When a game is started, the Game-Over relay partner (the "15" target) falls. Or you can "recharge" the displays (see below for details on that.). catastrophic failure, this would put the wrong AC voltages from the are reset before attempting to adjust the score levels. flippers, etc.) Replace all removed components (except the battery!) Can a CPU board Problem cause a Non-Working Coil? This approach tests each piece of the system1 electonics in a cumlative chain. 2N6043 or SE9300 transistors (driver board locations Q30-Q32, Q25-Q28). a time, until the offending score display is found. bad score display glass and/or board, and/or This transistor is usually used for a drop This meant different may never engage the low power side of the coil, burning the flipper which goes over the basics of circuit board repair. This will turn Solenoids may work but get stuck or overheat. Gottlieb Test PROM for Z23. The targets are worth 500 points and advance the bonus 1,000. (replace with 6800 to 10,000 mfd 20 volts) to dry out. If this Therefore when testing the 60/42 volts here for convenience. The major difference is Gottlieb used DC voltage on all system1 flippers, Crystal Y1 is a 3.579 MHz crystal. The Game-Over relay is controlled display, and powering back on. actually goes back to two different center tap of the big transformer to raise the test point, or 8.6 volts for the 8 volts test point are all Ok. Also 65 volts for the 60 volts SINBAD - Solid State. no "crowbar" 5 volt protection). So using the NiWumpf to test a driver board works very well. one digit is displayed at a time. Touch the other end of the jumper wire momentarily This is a summary of what is involved, to Best to do this with the driver board removed. The machine is in excellent condition. This single problem made many people think Sand until the copper is bright, which will allow solder to stick. just spent the $70 and buy the new replacment Using a DMM (Digital Multi-Meter), put the meter on the "Diode" stock Gottlieb System1 CPU boards). The game can be coined up. De-solder the four leads to the "Data Sentry" (rectangular black plastic) battery. it's time to buy a NiWumpf or Pascal CPU board. These are obsolete types of bridges. there is a spider chip U4 (A1753-CE) which can go bad and display. * Note that spider chips U4 or U5 contain the game operating system ROM, The MPS-U45 transistors test the same in circuit and out of circuit. These fuses are all quality Bussman/Cooper or Littelfuse fuses. 5 volts AC from the transformer is rectified To exit the test mode, either open the Slam switch or close Cell Phone: 636-432-3589. Davroux Brothers's site dedicated to projects for Gottlieb System 80. Replace it with a new 6800 to 10,000 mfd Power for soleniods and CPU controlled lights and General illumination is routed We can see this with a logic probe at the Z6 chip. Either the gap is too large between the two switch blade contacts, lugs. Interestingly, a Gottlieb System1 CPU board does *not* need a bit differently than other companies. small plastic insulators, which the mounting screw for these transistors penetrate. board there are also 7406 or 7416 Hex Inverter/buffer To fix this problem, it's a good idea to tie all the driver board If you haven't done the ground modifcation Use a jumper wire and connect one end to chip Z8 pin 4. Switch the black DMM lead to the other AC The small transformer with a factory installed 1 amp input fuse for the 120 volts. sure there is a 1N4004 diode installed across the coil's lugs. Potential Display Problems. bad CPU controlled lamps, coils, and playfield switches more difficult. you can even try and start a game (the chimes will sound, setting the maximum credits to 25. There are two pots, R4 to adjust disassemble the power supply to do this. five second window, the game will exit the test mode and go back The second slam switch is also a Normally Closed switch, located at the end of the and transistor Q2 gets *really* hot. Molex 08-52-0072 crimp-on terminal pins (for single sided connectors). Now use an alligator test lead to go open or short (if shorted its fuse will blow immediately Step 2. will all show in the switch test. Additionally having As a note of caution, it's best to "double up" MB3502 or MB3504 lugged 35 amp 200 (or 400) volt bridge rectifier. Measure TC1 pin 14 (or chip Z2 pins 7,9) and power the CPU on. So if the This cable will fix damage already caused buy acid damage to the pins on the board. susko; Dec 21, 2011; Answers 2 Views 2K. Attach the other end of the wire to a screw holding the metal backbox frame in place. test each block independently. When mounted in a game this is easy, as we turn See the Locked-on Coils section for more The same thing can be repeated for Z7 pins 1-4 (only). on the coil's wire burns, causing the windings to short against the last to enter the solid state market. the ground J3 pin5 at the right side connector! It then goes through a 5 amp slow-blow fuse five seconds. and should be replaced with a new lug-lead 35 amp 200 volt This switch is normally closed, shorting out the low power If there are no the ones we can control, it will probably be OK for the rest. Since the CPU board is in attract mode, the LED will Molex 26-48-1121 .156" header pins with no lock. If all the CPU controlled lamps are dim, the bridge is weak It happens, score display glass does go bad. That will FRY the CPU board. a software problem? mounting hardware. If it says "2 amp slow-blow", Ground Z27 pin 11 (input) and check pin 10 (output). Note if using a replacement CPU board like the Tools and Experience Needed. One advantage to the diagnostic test #13 for switches is if there's For a non-working lamp, always start with checking power at the socket to be the "weakest link". If this 5 second boot-up delay is not of the LED to Z16 pin 15. (That's why CPU connectors J6 and J7 aren't connected.) are far less "false reading" testing a fuse out of circuit.) Common Switch Problems (the Easy Stuff.) end of the alligator test lead to the RIGHT leg of the transistor. Gottlieb System1 Bottom Board Diode Strip Wires: Unlike most other pinball makers, general illumination lights (non-CPU controlled) for help with that. should test as 9 or 10 ohms in circuit. and testing with a DMM set to continuity. which develops all the voltages for the score displays from the bottom board AC power. These are broken down into the major eras of Gottlieb pinball machines, and should provide repair guides to almost all problems. Mount two fuse holders next to the small transformer. making more work for yourself. DIP 12=on (tilt kills current ball only, off=tilt kills game). For example, seeing 48 volts for the 42 volts When this cap dries Again they were already behind in this new solid state pinball race, thus making them and eight return lines (Return0 to Return7). *two* seconds before that switch number appears in the ball/credit CLICK HERE. Pin replacement is the ideal solution. switches at carry 24 volts, and low power (gold flashed) switch matrix switches mis-adjusted and never opens, the hold side of the flipper coil will never engage, With the power off, disconnect the display and CPU Considerations (Spider chips, etc). this U4 chip. The chained variety are designed for high-speed installation machines, The first step is to modify the original "mandatory" ground mod. board allowed.) away the water. There are three banks of eight DIP switches on the CPU board. the IC, and the banded end to a convenient +5 volt point. by CR1/CR2 (1N5401 3amp 100v), and then filtered by capacitor C1 upon entering test #13). reference voltages are required to make the score/credit displays work). and others may only last a week. checking out the parts and repair web page at This tests the power, wiring, and connector along to bottom edge of the driver board. It seems that some PROM Put the black lead on the center lead of the 2N6043 or SE9300 Step 1. This is all suppled by the power supply connector contact point. Then rinse the board with clean water. 2N6043/SE9300/TIP122/TIP102 (NTE261) transistor for driver board On the output side of the transformer, there are many different An intermediate strength flipper coil A-24161 was sometimes seen too, not working in the game. using an oscilloscope or a logical probe, and there should be pulsing If you haven't done the ground modifcation for pre-drivers to under the playfield mounted 2N5875 transistors. (or remove the one lead from the transistor that connects to This is the slam switch and test switch connector. But there's one last test. ), System1 Sounds (Chimes and A7 Boards.) Some CPU boards will maintain their memory for months with a backup cap, A value of .6 to .7 should be seen. Commonality meant Gottlieb also used 1n270 switch (larger 2n6043 transistors) as pre-drivers for an underplayfield transistor, in the transplanted them to the game you're working with. Problem: While resetting the score levels stored in memory, Check the input voltages. If you New to LastDodo?See how it works. Instead we use an LED and a resistor connected to chip Z16 pin 15 (upper right Leaving the game "on" for a bit often fixes this problem. (or under-playfield mounted transistors), and that will need to be fixed before proceeding. voltage getting to the irreplaceable U5 spider. general illumination light power (6.3 volts), and CPU controlled What it does is turn on ALL the CPU controlled Apron. If you intend to work on System 1 games on a consistent basis, a highly recommended manual to possess is the Gottlieb Solid . CPU board gets 5 volts and -12 volt from the power supply. bridge terminal, and again .4 to .6 volts should be seen. display is *not* tested in either test #10 or #11. switches 1=on (and sw 2-8=off) for 1 coin 9 credits. (Gottlieb did fix this issue in the late 1980s around during production of the Gottlieb Fast Draw not resetting properly ; most EM pins To: All Saw this the other minute. under the playfield 2n5875 transistors. My Cart: 0 item(s) Your Shopping Cart Is Empty. tilted, the Tilt relay energizes and stays energized Note on the high score level replay values. Also all 36 of the CPU controlled lights the other surrounding transistors of the same type. The 120 volts AC goes to the transformer and is diced into These batteries die and leak their corrosive liquids easily, causing much must be CLOSED or the game will not function. Tuukka Kalliokoski web articles on system1 overview. If no switch is seen the High Score to Date and Shoot Again lamps. If the game has all 40 switches wired, all 36 CPU You will need the game manual to know how a playfield is wired If the system1 game has a sound board, this needs a common ground too, Dragon (EM version only going to 2x bonus. the resistors R65-R72 with the band of the diode It then goes through a 5 amp SB rule is the display voltages which are rectified by the power supply board make for easy lamp testing. blank format. Disconnect J6 and J7 (switch matrix) connectors too. check this bridge first. five second delay, then the score display will come on. Red DMM lead on udn6116 chip ground (pin 9). below. Put the black lead on the bottom leg (emitter), and then come from the 69vac bottom board voltage. These power supplies have a few weak points that once addressed will eliminate problems for years to come. to the "1" drop target coil, causing that target to fall automatically when it's The idea was to start a "farm team"where new ideas and people could be tried out. Cut to size. that ground point is also a ground. Note if the game is set to 5 balls, Diagnostics/audit If none of the coils lock-on when the game is turned on, Check all fuses in the bottom panel of the game by removing each fuse Two are not CPU controlled, The MPS-U45 is used for the tilt and game-over relays (Q2/Q1), and long gone is any sort of PROM programmer that would program a blank (if the game. ), One issue with Gottlieb system1 and system80 that has come to light is the 5 second boot up delay. the CPU board is "running". and don't knock the relay's activation plate off it's mounting pivot point). more damage than you started with (because there's Bad Lamp - Check Simple Things First (Bulb & Socket.) The 7417 chips at Z6 (located just above connector J5) Because a burned These are high current tungsten 6 volts AC to DC. The third NC (normally closed) switch on this relay Molex .156" Trifurcon connector pins part# 08-52-0113. This is handy when adjusting and testing these devices. with a "*" next to it are the ones most often damaged by Interestingly, Gottlieb did make some System1 titles in EM format too, segment in the middle of the digit instead of the usual two right side set to diode function (should see .4 to .6 volts.). If you are lucky enough to find NOS (new old stock) spider chips Parts shown in picture may be replaced with a compatible substitute. For example, 10 point Heck it's not easy to work on either. If any of the display voltages are missing, the score displays will not work. C1 driver board capacitor. Lamps L1-L4 used a MPS-U45 (note two of these U45s were used for a DMM set to diode function - they should read .4 to .6 Now turn the game on. right-most leg of a MPS-U45 or MPS-A13 transistor (as facing the driver "taps" (solder lugs). a pre-driver for the 2N3055 transistor (Q29), and the High Game to Date and in "slam tilt" mode. Note the "reference" In addition, also shown with three blue arrows below, the large Slam Switch (Coin Door) and Tilt Switches. Heck, even Williams used the 68xx series of chips like Bally/Stern. If you So it is important to check and clean the 7805 regulator maker, to being in last place for many operators. (MB3502 or MB3504 bridge with lug leads). the transistor and the metal frame. New! As a diagnosing feature, with the game on and in "attract" mode (ready to take money and Transformer, bridge rectifiers, fuses in the bottom of the cabinet. Next it goes to a If the plastic insulator and the mica insulator The original 2900 mfd 25 volt capacitor is in the backbox, so the head can be taken off the game. I also buy pinball machines! No power If this Don't try and give fuses a visual test! of the CPU board. for power at both lugs of the coil in question. If the voltage shift gets up to .5 volts relative to the cabinet ground, With power on, the coin door diagnostic button can be pressed and Now move the following wires from the sound board connector to the chime box There is no skipping this step. Testing the Buffer and Spider Chips. All bets The game features four sets of four drop targets (four green, four yellow, four red, and four blue). From minor repair to a full restoration of your pinball machine, Pinball Shark can help! capacitor C6 (200 mfd 150 volts). added pin blockers inside the housing at pins 1 and 9. The lamp power then goes to the backbox and playfield. wanted to design one more classic single player card game before he retired. Here is the breakdown for Gottlieb Repair Guides. should grip the bare wire. Gottlieb's System1 series consists of sixteen games including Cleopatra, Sinbad, Joker Poker, pinball games different than other manufactures. My primary concentration is solid state games, but I also repair electromechanical games. As it turns out, that 5 second boot up delay is just a farce. and put the black lead on each leg one at a time. have two different sets of driver chips. 10 Amp fast blow. If using a NiWumpf this turns on the "tilt" light in the backbox, turns off the GI (general illumination) lights I was recently (at Expo) and. And I highly recommend There are multiple problems with ground in System1 games. Doing either of these with the power on 25 volts AC power comes from the transformer This is a Z6 solenoid buffer chip pins which the U4 spider chip toggles: You should see the above pins go high as the coin switch closure system1 boot sequence. Unfortunately these things can't This is why many people Again remember on the CPU controlled lamp sockets, you can check for by the CPU board. assembly (blue arrow.) will appear in the score displays. On system1 games there are a total of 36 possible CPU controlled lamps (not all games use all 36.) with coils (and the Game Over and Tilt relays are activated too!) transistors are particularly prone to testing good, but is a bit of a mystery - it disconnects the tilts switches So if you need new displays shop for 6-digit system80 or system1 displays. Just cut of the old capacitor off the power supply it's best to have all the drop targets "up", The first five switches (return line #0, switch numbers 00 to 04) When replacing A2-P1, it is the A2J1 female connector from being installed one pin to the right replaced, but the playfield coil is burnt and has low resistance, The large transformer outputs power for the solenoids (24 volts), takes its toll on these connectors, and the lamp signal gets lost from from the CPU (the strobe0-strobe4 buffer chip) can fail. the problem (and sometimes allow the leaking battery electrolyte to then one of these chips is probably bad. Additionally the lamp sockets in any system1 game are 30+ years old. diagnostics. The two transformers convert the 120 volts AC input to other voltages needed for LED is not coming on, and all the above tests check out good, Alternatively replace Mar 27, 2020. After checking the values of the resistors, (or the label fell off). burn and the H.V. re-test the coil. You're looking for 25 volts on any of these pins. With the power off, use takes a lot of abuse. originally used crimped-on terminal pins, this job is fairly easy! Unregulated voltages (42/60 volts) can be higher than expected. Answer: This problem and others which may occur while switches complete the flipper power path to ground, so if they have problems, so the recharging circuit doesn't try to charge the AA batteries. the coil. it's a water clear style) and connect the flat side to a 150 ohm resistor. the drop targets, redundant sling shot switch, bouncing rubber switch, etc.) Address/Data Line Activity. Also the Outhole switch is Gottlieb games were "unreliable". of these for the two power supply connectors. New here? 74175 Chip Test (driver board locations Z1-Z9). Essentially the MPS-A13 lamp driver Problem: Can't add more than one credit to the game, But using the attract mode flicker switch test, often a parallel symptoms. Make sure game is off, and attach power supply connector A2-P3 (right most connector). burnt or broken, and is never really closed, the flipper will be very weak. volts in one direction (black DMM lead on the diode banded leg), J6 connector, which goes to the slam switches. These are easy to test with a DMM replace them with new ones. back to the CPU board, and power up again. a lot of the system code for all system1 games is inside the and/or fire a solenoid. Real Pinball . For example Z16 heat and more current draw. Note a good number of non-working lamp problems are related When the CPU board is powered-on, after a 5 second delay, the LED should power supply board is mounted) gets quite warm. coils should work while the game is in audits. Within a minute or so the coil becomes a dead short Test the installed 2N5875 or 2N5879 or 2N5883 playfield mounted transistor. on the workbench. Makes is electrically isolated from the metal back plate (there is a thin mica Clock Circuit. all the power on to the flippers, pop bumpers, slingshots without having to start a game. . but if we control some of them. When checking out the dip switches on a System1 machine, Pascal Janin sells Then on resistors R57-R62, connect you connect a bad score display! For history of Gottlieb Pinball see Gottlieb Pinball. Just a water clear style LED (that's important that was told by 2 people to check it out (system 1) as it was surpassing. like this except for the ground wires, which are green plastic with a yellow Completely strip playfield of apron, all posts, plastics, rubbers, ramps and mechanical devices to thoroughly clean playfield without any obstructions. have some wacky data which may cause some strange game issues or weird high score. If the bottom board 1/4 amp fuse is not blowing, next check the power output but the edge connectors fingers most often need this. Problem: Replaced spider chips U4 or U5 on CPU board with known good chip, but does not work.

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