New Life Games LLC
NLG Users Repair Logs and Other Ramblings. Request your very own topic. Just ask any site staff. => Channelmaniac's Arcadecomponents' Old School Repair Logs => Topic started by: channelmaniac on May 07, 2014, 07:05:15 PM
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Model: Turbo Out Run
Symptom: Dead
Lights were on for the video board but not for the CPU board. Replaced burned power connector and adjusted power supply voltage to 5.05v.
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Model: Turbo Out Run
Symptom: Missing obstacles and background objects
This was a strange one. The sky and road obstacles were missing. The buildings were there but the road and the car never moved left or right. This was a problem with the subprocessor. Built-in tests showed one of the ROMs bad. ROM read good in an EPROM programmer and a replacement ROM gave the same symptoms. Checked all the pins on the socket for continuity. The ROM pairs (High & Low) had a common CE line. This was driven by a 74LS138. The chip had badly rusted legs. Replaced the chip and the game worked normally. The rust had travelled up the body of the chip.
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Model: Turbo Out Run
Symptom: No audio
Resoldered the interconnects and the audio output IC on the amplifier board.
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Model: Sega NAOMI
Symptom: Fails self test
Self test showed IC29 as bad. Replaced IC29 and re-ran the test.
IC29 was a standard 62256 surface mount type SRAM IC.
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Model: Sega NAOMI
Symptom: Dead
System gave raster but no picture. Inspection of the board turned up a leaking .1f 5.5v memory capacitor. The electrolyte spread on the board and started corroding things.
Desoldered the BIOS ROM and the serial EEPROM holding the code for the Altera FPGA chip. Cleaned the electrolyte from the board and inspected the board for damage. The corrosion damaged a plate thru under the serial EEPROM socket, causing the FPGA chip to not load its code from the EEPROM upon boot. Repaired the trace, replaced the bad memory cap, and tested the board.
The EEPROM chip connects to the Altera chip as follows:
Pin 1 - Pin 12
Pin 2 - Pin 1
Pin 3 - Pin 37
Pin 4 - Pin 4
Pin 5 - Ground
Pin 6 - No Connection
Pin 7 - +5v
Pin 8 - +5v
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Model: NAOMI
Symptom: Broken USB jack and noisy fan
Replaced the noisy fan and USB jack.
USB jack was tough to find. Desoldered the jack and took it to an area "computer junk store." Found a Pentium II board in their scrap bin that had the same jack. Desoldered and installed it on the NAOMI system. Played a game of Marvel vs. Capcom 2 to test the system.
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Model: Spiderman (System 32)
Symptom: Missing graphics
Repaired a gouged trace between IC44 through 47 (Dual Port Video RAM) and IC67, a custom Sega IC.
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Model: NAOMI 1
Symptom: Has audio but no video.
Traced the video output back to the RAMDAC chip. The RAMDAC was finger blistering hot. Replaced the RAMDAC (Sega # 315-6145) with one pulled from a parts NAOMI board.
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Model: NAOMI 1
Symptom: Intermittent controls
Replaced a broken USB jack on the I/O board. Checked and replaced a leaking memory backup capacitor.
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Model: NAOMI Capcom I/O
Symptom: Audio cuts in & out
Recapped the audio section and tested.
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Model: ST-V w/Shienryu cart
Symptom: RAM failure
Could not duplicate RAM failure message. Game would not boot but system would pass all user tests. Reset NVRAM and system would then recognize cartridge. Set the game cabinet for 2 player mode and took it out of multi mode. System would now see and test cartridge but still fail to play it.
Booted the game into factory diagnostics and ran the factory set of diagnostics on the game board. The board would "pass" the slave CPU but would lock up as that test finished. Pushed down on the slave CPU (Hitachi SH-2 with LOTS of small pins) while booting the board and it immediately fired up the game cart properly. Resoldered the slave CPU and played a couple of games to test the system.
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Model: Columns
Symptom: Game would lock up. Colors were flashing incorrect on the screen and inputs would not work.
Replaced a bad 315-5296 custom IC to fix the inputs. Resoldered pin 30 on hybrid IC 315-5242 to fix the color issue. Resoldered custom IC 315-5313 to fix the lockups.
Reset the DIP switches and tested the game.
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Model: Naomi 1 cart: Marvel vs. Capcom 2
Symptom: Locks up, random errors on ROM tests
Replaced 6 surface mount 74LCX16245 16bit buffer ICs and tested.
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Model: ST-V
Symptom: Cartridge error
Resoldered the two surface mount SH-2 CPUs, cleaned the slot, and ran the board through diagnostics.
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Model: ST-V
Symptom: Random failures - lockups, cart errors, etc.
Resoldered the two surface mount SH-2 CPUs, cleaned the slot, and ran the board through diagnostics.
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Model: NAOMI Capcom I/O
Symptom: Dead, no power
Metal case was bent and touching the bottom of the board, shorting it out. Replaced one broken ferrite filter and straightened the metal case. Reassembled and tested.
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Model: NAOMI
Tip: Error Messages
Error 01: This game is not acceptable by main board.
[CAUSE] MEDIA BOARD is not inserted (completely) into the MAIN BOARD.
[COUNTERMEASURES] Power off the unit, then reinsert the MEDIA BOARD.
Should the problem persist, the BOARD may be damaged.
Error 02: Main board malfunctioning.
[CAUSE] MAIN BOARD is inoperative.
[COUNTERMEASURES] Verify that the MAIN BOARD is connected properly.
Error 03: Bad serial number on main board.
[CAUSE] Unable to read MAIN BOARD serial ID.
[COUNTERMEASURES] Disconnect the MEDIA BOARD from the MAIN BOARD and send the MAIN BOARD for repair.
Error 04: Bad serial number on media board.
[CAUSE] Unable to read MEDIA BOARD serial ID.
[COUNTERMEASURES] With the MEDIA BOARD still attached to the MAIN BOARD, send the unit in for repair.
Error 05: This game is not acceptable by main board.
[CAUSE] The game is a foreign edition.
[COUNTERMEASURES] Use the domestic version of the game.
Error 11: JVS I/O board is not connected to main board.
[CAUSE] (1) I/O BOARD is not connected. (2) Unreliable connection between MAIN BOARD and I/O BOARD.
[COUNTERMEASURES] (1) Connect the I/O BOARD to the MAIN BOARD. Verify that the power cable is connected to I/O BOARD. (2) Reconnect or replace the USB CABLE that connects the I/O BOARD to the MAIN BOARD.
Error 12: JVS I/O board does not fulfill the game spec.
[CAUSE] Correct I/O BOARD is not connected.
[COUNTERMEASURES] Use an I/O BOARD that provides the proper input/output for the game.
Error 21: This game is not acceptable by main board.
[CAUSE] Game data loaded from the GD-ROM to the DIMM BOARD is corrupted.
[COUNTERMEASURES] Verify the GD-ROM DRIVE and interface connection. Check the GD-ROM disc for scratches, dust or dirt.
Error 22: Communication error occurred between main board and media board.
[CAUSE] No response from DIMM BOARD to MAIN BOARD.
[COUNTERMEASURES] Ensure that the DIMM BOARD and the GD INTERFACE BOARD are properly connected. Should the problem persist, the DIMM BOARD or GD INTERFACE BOARD may be damaged.
Error 23: GD-ROM drive cover is open.
[CAUSE] The GD-ROM DRIVE cover is open.
[COUNTERMEASURES] Ensure the GD-ROM DRIVE cover is firmly closed.
Error 24: GD-ROM is not found.
[CAUSE] GD-ROM disc is not found.
[COUNTERMEASURES] Insert the GD-ROM disc correctly. Check the GD-ROM disc for scratches, dust or dirt.
Error 25: Cannot access GD-ROM drive.
[CAUSE] (1) Unable to access GD-ROM DRIVE. (2) The GD-ROM DRIVE cover is open.
[COUNTERMEASURES] (1) Verify that the GD CABLE and the power cable are properly connected to the GD-ROM DRIVE. (2) Close the GD-ROM cover securely. Should the problem persist, the GD-ROM DRIVE may be damaged.
Error 26: Media board malfunctioning.
[CAUSE] KEY CHIP is not found.
[COUNTERMEASURES] Attach the proper KEY CHIP for the game. Insert the KEY CHIP securely.
Error 27: DIMM memory is not enough.
[CAUSE] (1) Insufficient DIMM MEMORY on DIMM BOARD. (2) DIMM MEMORY is not connected securely.
[COUNTERMEASURES] (1) Provide a suitable amount of DIMM MEMORY for the software. (2) Verify that the DIMM MEMORY is connected securely to the DIMM BOARD.
Error 31: This game is not acceptable by main board.
[CAUSE] The game has not been downloaded into the DIMM BOARD from the HOST MACHINE.
[COUNTERMEASURES] Check network connections. Verify that the PC is connected to the network. Reset the main power. Wait until the game is displayed on the main screen, then turn the satellite power on and reboot. In Test Mode, select NETWORK SETTING from the SYSTEM MENU and check that the NETWORK TYPE is set to ETHER. In Test Mode, select NETWORK SETTING from the SYSTEM MENU, go to SET IP ADDRESS and verify that the REMOTE
setting is appropriate for the game in use. Check the internal DIMM BOARD battery is functioning
Error 32: DIMM memory is not enough.
[CAUSE] (1) Insufficient DIMM MEMORY on DIMM BOARD. (2) DIMM MEMORY is not connected securely.
[COUNTERMEASURES] (1) Ensure there is sufficient DIMM MEMORY for the software. (2) Verify that the DIMM MEMORY is connected securely to the DIMM BOARD.
Error 33: Gateway is not found.
[CAUSE] HOST MACHINE is not found.
[COUNTERMEASURES] Attach the KEY CHIP designed to support the game. Make certain that the KEY CHIP is inserted completely.
Error 51: Wrong video output setting of horizontal scanning frequency.
[CAUSE] The game does not support horizontal sync frequency setting.
[COUNTERMEASURES] Change the No. 6 DIPSW on the CONNECTOR BOARD. ON is 31 kHz, OFF is 15 kHz. The monitor must support these frequencies.
Error 52: Wrong video output setting of horizontal/vertical screen.
[CAUSE] The game does not support the vertical/horizontal screen settings.
[COUNTERMEASURES] Change the No. 4 DIPSW on the CONNECTOR BOARD. ON is for vertically placed monitor screens, OFF is for horizontally placed monitor screens. Change the monitor placement from vertical to horizontal or vice versa if necessary.
CAUTION 54: GAME ASSIGNMENTS ARE INCORRECT. SET CORRECTLY IN SYSTEM ASSIGNMENTS OF TEST MODE.
[CAUSE] The setting of MONITOR TYPE differs from the correct setting of the game.
[COUNTERMEASURES] Enter the TEST mode, and change the MONITOR TYPE setting of MONITOR TYPE in SYSTEM ASSIGNMENTS to the correct setting
suitable for the game. For the correct setting, refer to the Instruction Manual attached to the game. If necessary, perform Horizontal/Vertical transposition of the monitor, as applicable.
(In other words, set it to the appropriate monitor type (vertical/horizontal play) and rotate the monitor as necessary.)
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Model: NAOMI
Symptom: Error 01: This game is not acceptable by main board.
Connector CN1 had 4 bent pins. Replaced bad connector with one from a parts board and tested.
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Model: ST-V
Symptom: Won't play carts
Ran system through self tests. System locked up doing the cart test. Ran factory tests and board passed all except would lock up on testing the slave CPU. Resoldered both SH-2 CPUs and tested.
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Model: Naomi JVS JAMMA adapter
Symptom: No sync to monitor
I/O board would not output sync to monitor. Replaced bad surface mount 74ACT86 and tested.
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Model: Naomi
Symptom: Will not communicate with JAMMA adapter
Replaced broken USB port on the Naomi's I/O board. Tested.
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Model: Naomi
Symptom: RAM Error. Will not boot cartridges
Self test showed error on IC29, the 62256 SRAM used for backup. Pin 20 on the RAM was stuck high. Removed leaking backup memory capacitor and the 8 pin EEPROM next to it. Cleaned up the leakage, resoldered 3 pins on the surface mount 74157, installed a new .1F supercap, new 8 pin socket, reinstalled the EEPROM, and patched a damage trace on the EEPROM. Tested.
This EEPROM is used to load configuration data into the Altera FPGA chip. Without it working correctly the board will not operate properly.
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Model: Naomi
Symptom: RAM Error. Will not boot cartridges
Self test showed error on IC29, the 62256 SRAM used for backup. Pin 21 on the RAM was missing its signals. Removed leaking backup memory capacitor and the 8 pin EEPROM next to it. Cleaned up the leakage, installed a new .1F supercap, new 8 pin socket, reinstalled the EEPROM, and patched a damage trace between the BIOS ROM and IC29. Tested.
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Model: Naomi
Symptom: Dead
CPU fan was frozen. Replaced CPU fan and bad case fan. Replaced leaking supercap and tested.
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Model: Naomi GD-ROM, 610-0617
Symptom: Dead
JAMMA I/O power cable and GD-ROM power cable were mixed up and the GD-ROM was killed with +12v on the 5v line.
Replaced the control board with the control board from a Sega Dreamcast and tested.
This model of GD-ROM uses the same board and laser assembly as the Sega Dreamcast.
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Model: Naomi
Symptom: Missing audio on right channel
Replaced burnt 510 ohm surface mount resistor at R333S and tested.
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Model: Pengo
Symptom: Dead
Board was in a bulk buy and had been scavenged for parts.
Replaced missing 74LS04 and 74LS138 ICs. Board had no clock. Replaced 74LS368 at IC6. No change. Examined clock circuitry closely and saw a hairline crack in R17. Replaced R17 and board tried to boot. Cleaned EPROM legs and board booted, but had graphics problems.
Moving graphics were jerky in nature and backgrounds and text were flipped from the direction the player sprites were playing, similar to a flipped screen in cocktail mode, until after the first round of attract mode finished then were correctly oriented. Repaired 2 gouged traces, one going to an input to a 7489 Bipolar RAM, to fix the jerking graphics. The FLIP signal coming from the 74LS259 at IC 27 was improper on power up and corrected after the first round of attract mode. Replaced the IC and tested.
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Model: Chihiro (House of the Dead III)
Symptom: Error 2: Mainboard Error
This system is a Microsoft XBox system with a Sega adapter board attached and a standard Naomi Network DIMM board and GD-ROM plugged in. The Sega adapter board had the same type of leaking .1F supercap that the Naomi 1 systems have. (Unsure on Naomi 2 as I haven't had one on the bench yet.)
Also, the Xbox system it's based off of has a 2.5v 1F supercap over on the front edge of the board. It leaks too and will corrode traces.
You MUST remove the caps, clean up the electrolyte leakage, and replace the caps. Check ANY and ALL traces around the .1F cap on the Naomi adapter board. Patch any damaged traces. Be careful as there is one trace that goes under a tiny 8 pin chip to a pin on the opposite corner and not straight up the side of that chip like it looks.
Patched 1 trace, replaced the supercaps, and tested.
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Model: Naomi GD-ROM
Symptom: Will not read discs
Controller board had a smoked IC chip. Replaced the Toshiba TC9450AF IC with one from a donor board. Tested.
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Model: Naomi GD-ROM
Symptom: Very noisy when seeking
Replaced laser head motor/gear and tested. Gear had cracked and spread far enough apart that it was causing the gears to click.
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Model: Naomi GD-ROM
Symptom: Will not read discs
Replaced laser assembly with one from a physically damaged donor drive. Tested.
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Model: Sega Naomi
Symptom: RAM Error
RAM Error: U29 bad
Removed leaking supercap, the 8 pin EEPROM, and the 42 pin BIOS and socket. Cleaned electrolyte from the board and jumpered 2 traces damaged by the leaking supercap. Replaced the 8 pin socket for the EEPROM and reinstalled the IC. Reinstalled the 42 pin socket and the BIOS chip. Reset the Backup RAM and tested.
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Model: NAOMI
Symptom: Dead
Both the GPU and case fan were seized. Replaced both fans and tested. Replaced leaking memory supercap and re-tested.
NOTE: The NAOMI will NOT boot if the GPU fan is turning slow or not at all.
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Model: Laser Ghost (System 18)
Symptom: No sync, Crackled sound
Cleaned board, cleaned edge connector with a fiberglass pencil, and replaced 2 physically damaged caps. Tested.
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Model: ST-V
Symptom: Dead
Built a replacement shorting plug to go into connector CN5. Game then booted with a cartridge error. Ran Factory Tests on Slave CPU and it passed. Disassembled the Die Hard cartridge, cleaned the edge connector, reassembled, and tested.
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Model: ST-V
Symptom: Dead
Resoldered the 2 SH-2 CPUs. Tested.
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Model: ST-V
Tip: Building a shorting connector for CN5
The board will not boot without this shorting connector or a daughterboard plugged into CN5. Take a female jack that fits the connector (Same kind as on a Playchoice-10 motherboard) and built is as follows:
Cut and remove all soldertail pins from row C
Cut and remove pins A1 through A5
Cut and remove pins B1 through B5
Cut and remove pins A27 and B27
Bend pin A6 to touch B6, A7 to touch B7, A8 to touch A8, and so on for all the remaining pins on rows A and B.
Solder pin A6 to B6, A7 to B7, A8 to B8, and so on for all the remaining pins on rows A and B.
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Model: NAOMI 2
Symptom: Leaking supercap
Cleaned up leakage from the supercap and patched two damaged traces.
Note: Most of the large group of traces near the supercap go to a pair of SOIC chips, but the 5th one in the group goes under them and down to the right most of the set of 4 thru-holes on the far side of the coin cell battery holder. If the traces have dark spots on them the electrolyte from the supercap has damaged the traces. Check continuity on them and patch as needed with 30ga Kynar wire.
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Model: Bloxeed
Symptom: No sound
Replaced blown audio amp chip and one capacitor in the sound section. Tested.
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Model: Pengo
Symptom: Crash/reboot. Character placements on screen are wrong
Pin 40 on the custom CPU was broken at the ceramic body of the IC and causing the crashing/rebooting. Replaced the custom CPU with a standard Z80A and erased/reprogrammed the 8 program EPROMs with unencrypted ROM code from the pengo3u ROM set. Replaced 74LS161 at IC90 to fix the character placement issue. Tested.
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Model: Clutch Hitter (System 18)
Symptom: Will not play.
Replaced missing PAL and tested.
Converted game to Hammer Away. :)
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Model: My Hero
Symptom: Lines on screen when cold
The top of the screen and a few other graphic elements had lines through them for the first couple of minutes of game play until the board warmed up. Replaced a bad 315-5025 18-pin custom IC at IC46 and tested.
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Model: Wonderboy
Symptom: Dead. Nothing on screen.
Replaced bad program ROM at IC132 and bad sprite ROM at IC 2 on the small daughterboard. Board would now play blind. Cleaned board, replaced bad 74S175 at IC153 and IC152 to restore video output. Graphics were corrupt and sprites were missing. Cleaned ROM legs on IC80, 81, 82, and IC63, 64, and 65 to fix graphics issue. Replaced bad 74S175 at IC67 to restore sprites. Replaced broken red LED and tested game.
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Model: Clutch Hitter
Symptom: Dead. Sync is improper causing monitor to go crazy.
Removed suicide CPU replaced it with a standard 68000 CPU. Converted game to Hammer Away ROMs and set the jumpers on the daughterboard. Reflowed several sides of surface mount chips that were barely soldered at the factory and noticed that the main CPU clock was missing. The three oscillators were dead and would jump to life when the power pins were touched with the logic probe. Replaced OSC1, OSC2, and OSC3 and tested.
Reset Backup RAM to fix the garbled high score table and retested.
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Model: Regulus
Symptom: Dead
Cleaned corroded pins on all socketed chips. Board would boot but had no sync and no blue. Cleaned edge connector and retested. Board would boot and play but had corrupt background graphics. Self test showed ROM 133 was bad. Checked the socket and found pin 11 (Data 0) was not making contact with the IC. Replaced the bad socket and tested the board successfully.
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Model: ST-V
Symptom: Dead
Reflowed the 2 SH-2 CPUs then replaced 3 burned 75 ohm resistors and 3 blown transistors in the video output section. Tested.
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Model: Bloxeed
Symtpom: Missing graphics elements. Garbage on screen.
Reflowed a surface mount video controller IC that had cracked solder joints and tested.
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Model: Columns
Symptom: Dead
Replaced 2 bad 64K SRAM ICs and a damaged ROM socket then straightened a bent pin on one of the program ROMs. Board would then run through attract mode but had missing graphics. Replaced the 27C010 EPROMs (JEDEC pinout) with the correct 27C100 (non-JEDEC pinout) EPROMs and tested. Board would lock up when starting game. Replaced incorrect security IC and retested successfully.
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Model: Naomi
Symptom: Leaking supercap. Will not read switches.
Removed IC31, its socket, and the leaking supercap. Cleaned under and around the cap and where IC31 was. Patched a damaged trace to IC29. Installed a new 8 pin socket for IC31 and patched a damaged trace to pin 4 of it. Game would boot but not read any switch. Replaced 2 bad pushbutton switches and 1 set of 4 DIP switches with new ones and tested.
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Model: Naomi
Symptom: Noisy. Replace supercap
Replaced case fan and leaking supercap. Tested. Failed RAM tests for IC29. Jumpered 2 dead traces and replaced the 8 pin EEPROM socket. Tested successfully.
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Model: Naomi
Symptom: Dead
Board actually played blind. Replaced 3 bad 470uf caps in the video circuit and a dead 315-6145 DAC IC to restore video. Replaced the 8 pin EEPROM socket and the leaking supercap. Tested.
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Model: Naomi GD-ROM
Symptom: GD-ROM not found. Noisy.
Replaced optical mechanism and tested. Replaced bad fan and tested again.
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Model: Moonwalker
Symptom: Dead
Board had a Sega Resurrection kit installed but was not brought back to life.
Checked the data bus pins on the program ROMs from Sega Resurrection and found that the chip in A7 had garbled data lines, but the EPROM checked good in a programmer. Back tracked the circuit and found the Work RAM on the same bus and replaced it. Tested the game successfully.
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Model: Thunder Blade
Symptom: Dead
Replaced the suicide CPU with a proper 68000 CPU and erased/reprogrammed 2 EPROMs with suicide free code. Tested.
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Model: Moonwalker
Symptom: Dead
Board was missing 1 program ROM, 3 SCR ROMs, 2 Sound ROMs, and 4 OBJ ROMs.
Replaced dead CPU with a 68000 CPU, replaced the program ROM and the missing program ROM with ones programmed with suicide free code. Replaced remaining missing ROMs and tested. Board worked but had graphic corruption with some elements and colors missing. Patched a gouged trace going to pin 8 (Address line A0) of the 2 Color RAMs and tested.
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Model ST-V
Symptom: Locks up while playing
Reflowed the 2 SH-2 CPUs and tested.
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Model: ST-V
Symptom: Cart Error
Put board in factory test mode and it failed the Slave CPU test. Reflowed both SH-2 CPUs to fix the error and tested.
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Model: ST-V
Symptom: Dead. Missing plug-in power coupling module.
Fabricated a replacement module and installed it. Board was still dead. Tested the GAL chip next to the 68K CPU and the BIOS chip by substitution from a working board. Still dead. Reflowed both SH-2 CPUs to revive the board and tested.
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Model: Rastan
Symptom: Distorted sound until game warms up
Board had TK branded caps on it. These are the same failure prone caps that cause so many problems on the Neo Geo board's audio section.
Recapped the sound section and tested.
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Model: Turbo Out Run
Symptom: Dead
Power supply was outputting 6.75v on the 5v line and the adjustment knob only took it down to 5.7v DC. Replaced the power supply, adjusted its output to be 5.1 at the edge connector, and successfully tested the game.
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Model: Frogger
Symptom: screen full of cherries
Board died on the bench. Replaced a bad crystal as the legs had rotted away from the body. Replaced 1 bad Character ROM, 1 bad Object RAM, 1 bad Video RAM, and 1 bad main RAM. Tested. No inputs and no audio. Replaced bad 7400 at IC41 on the sound board as it was chattering on output and constantly resetting the 8255 I/O chip. Fabbed a remote volume control but still no audio. Replaced 1 bad ROM with rotted legs, bad Z80 CPU socket, and a dead Fujitsu 7442 4 to 10 decoder IC. Tested successfully.
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Model: Frogger
Symptom: No sound
Sound CPU was crashing and /INT was stuck low. Replaced bad socket on the Z80 CPU. The /RFSH signal wasn't getting to the 74LS04 at IC25. This was causing the wrong signals to be sent to the /CS line on the 2114 RAMs at IC30 and IC31. Tested, no audio. Replaced bad M51516L audio amplifier IC and retested.
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Model: Frogger
Symtpom: Boots to screen full of Xs
Inserted the Frogger Test ROM and it would not boot. Checked the Program RAMs and they were OK. Checked the 74LS138 decoders and found a dead pin on the one at IC16. Replaced the IC and tested.
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Model: Frogger
Symtpom: Incorrect colors - missing green
Board was missing green and reds showed up as gray during attract mode.
Replaced bad 74LS20 at IC36 and tested. IC had outputs, but didn't match the inputs as shown when testing with an HP 10529A logic comparator.
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Model: Bank Panic
Symptom: Dead. Missing CPU and has capacitor leak damage
It had some VERY nasty, swollen capacitors that leaked and left a white-ish brown crusty material on the board. Removed 4 220uf, 5 100uf, and 1 47uf @ 16v capacitors then cleaned and dried the board. Next, cleaned the edge connector with a fiberglass pencil, installed new caps, and checked where the power (pin 11) and ground (pin 29) connections were on the missing CPU's socket. They were right for a Z80 so one was installed.
Built a JAMMA adapter, plugged the board in, and tested all the functions.
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Model: Choplifter
Symptom: Dead, missing parts.
Reinstalled 2 missing Z80 CPUs. Board would boot to the IC CHECK screen then fail on IC38 (Palette RAM) with the IC CHECK text flickering and with garbage outside the screen area where it should be hidden by Horizontal Blank signals. Replaced bad 74LS27 at IC28 that had floating outputs. No change. Replaced bad 74LS109 at IC48 with weak chattering outputs to fix the garbage during Horizontal Blanking and the flickering of the IC CHECK text. Replaced bad 74LS174 connected to the Palette RAM to fix stuck address lines causing the IC38 error. Tested.
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Model: Choplifter
Symptom: IC38 Error
Replaced 74LS245 at IC30 and a 74LS174 at IC54 which had a dead output. Board would boot but had a white background behind "IC CHECK" and minor graphics glitches. Replaced bad 74LS153 at IC 52 and tested.
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Model: Choplifter
Symptom: No sync
Removed a solder blob from a bridge point, repaired a cut trace, and replaced the 74LS04 at IC48 to fix the sync issue. Board was stuck at "IC38" error. Replaced multiple bad Fujitsu 74LS153 chips at IC52, IC61, and IC161 with dead outputs. Board would then boot and play but had missing text and lines in background images. The sky was also the wrong color and the words "IC" and "CHECK" had white backgrounds (but not the space between the words.) Replaced bad custom IC 315-5025 at IC13 and tested.
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Model: Moon Cresta
Symptom: Dead
Replaced bad 74107 clock divider IC and tested. Recapped the power and audio amplifier sections of the PCB. Tested.
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Model: Choplifter
Symptom: Dead
Board had severe Fujitsu logic rot.
Dead Choplifter. Stuck reset. Replaced 2x 7404 and the 74LS192 in the reset circuit and then had /reset. Dead Choplifter. Replaced a bad 74LS244 on the CPU address lines. CPU was alive, but no video.
Replaced a bad 74LS157, 1 74LS161, 1 74LS139, 3 74LS109, and a 74LS00 to get clocks and control signals back. No video. Replaced 4 74LS174, 5 74LS153, 3 74LS157, 1x 74LS377, and 4 74LS273 to get the video back with text of CCCCKKKK instead of IC CHECK.
Let the IC check run and had an error message but it showed up as 99999999. Replaced a bad 74LS245 to resolve that one (IC 39 error) only to receive a 22222222 error. Replaced 2 74LS245, 1 74LS244, 1 74LS367 to clean up the garbage on the screen, but still had the 22222222 error. Replaced bad RAM at IC2 to fix that.
Next, the board showed IC CHECK and all checks passed, but all the sprites are drawn as scrambled horizontal lines on the left side and the middle of the screen. Replaced 2x 74LS245 chips connecting to the Sprite RAM to resolve that. Tested.
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Model: Choplifter
Symptom: IC39 error
Replaced a dead 74LS174, 74LS245, and 6116-10 in the color output circuit. Converted board to Wonderboy. Tested.
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Model: Naomi
Symptom: Replace leaking supercap
Replaced supercap and dead battery. Tested.
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Model: Naomi
Symptom: Replace leaking supercap
Replaced supercap and dead battery. Tested. Replaced bad case fan. Tested.
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Model: Naomi
Symptom: Dead. Replace leaking supercap
Replaced supercap, dead battery, and bad BIOS chip. Tested.
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Model: Naomi
Symptom: Error 03. Replace leaking supercap
Replaced supercap and dead battery. Tested. Replaced bad BIOS chip and retested.
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Model: WWF Royal Rumble (Naomi cartridge)
Symptom: Locks up
Cart test showed all ROMs bad. Replaced three 74LCX16245 SMT bi-directional buffer chips and tested.
Note: These chips are 3.3v with "5v tolerant inputs" and are easily damaged by over voltage. A Naomi game system should NEVER be run with more than 5.1 volts going to it.
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Model: WWF Royal Rumble (Naomi cartridge)
Symptom: Error 1 when cartridge is installed.
Cart was not seen by the system. Replaced three 74LCX16245 SMT bi-directional buffer chips and tested.
Note: These chips are 3.3v with "5v tolerant inputs" and are easily damaged by over voltage. A Naomi game system should NEVER be run with more than 5.1 volts going to it.
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Model: Naomi
Symptom: IC29 BAD
Removed multiple 18ga jumper wires from between the BIOS ROM and IC29. Removed the 8 pin EEPROM socket, BIOS ROM socket and the leaking supercap. Cleaned that area of the PCB to remove corrosive electrolyte from the supercap. Patched 5 address line traces to IC29, one signal trace to the 74LS157 next to it, and patched multiple dead ground traces on the 74LS157. Installed new 8 pin and 42 pin sockets. Reinstalled the BIOS ROM. Cleaned corroded pins on the 8 pin EEPROM and reinstalled it. Installed a customer supplied supercap and a new coin cell battery. Tested.