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 04, 2014, 07:50:08 PM
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Fixed: Captain America:
Symptom: Dead, missing parts.
Replaced 2 missing proms with ones pulled from parts Capt America board. Moved over 7 EPROMs from the parts board and burned an EPROM to replace the missing 8th. Fixed a short on the bottom of the board. CPU would not come up. Checked the reset line - it was being held high and never cycled from low to high to have the CPU boot normally. Traced it back and replaced a broken capacitor to fix the board.
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Fixed: Robocop:
Symptoms: Dead
Replaced 6 missing EPROMs, installed 2 20-pin sockets and 2 74als245 ICs. Still dead. Found and replaced a bad 20 pin socket on the ROM board. Board now booted but had corrupt background and foreground graphics. Did a physical inspection of the board and found bent pins on one of the graphics processors. Fixed the bent pins on graphics processor IC to fix the background graphics. Found and fixed three burnt traces under the 74LS157 ICs to fix the character/foreground graphics and finish the game.
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Fixed: Fighters History Dynamite
Symptom: Dead
A physical inspection revealed 2 gouged traces on the board. Repaired the traces and tested the game.
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Fixed: Mutant Fighter
Symptom: Dead
A physical inspection turned up a hit on the bottom board that has pushed the solder on 2 plate throughs together to where they shorted. Dabbed a bit of rosin flux on the lump and used the soldering iron to unbridge them. Game booted but had no audio. Replaced the broken volume control pot (one leg had come loose from the pot) to finish the repair.
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Model: Wizard Fire (Dark Seal II)
Symptom: Scrambled sounds
Board was randomly playing incorrect sounds. Resoldered the 2 OKI 6295 sound chips and a 74LS283 IC then tested the game.
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Model: Captain America
Symptom: Dead
Board was dead. No power. Replaced 3 broken power filters next to the JAMMA connector and tested.
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Model: Captain America
Symptom: Graphic Corruption on player/enemy
One address line was missing on the ROM at C17 and the clock signal on pin 11 was missing on the LS373s at A20 and A12. Cleaned a liquid spill and repaired 2 bad traces and 1 bad plated thru hole under the ROM at C17. Tested.
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Model: Captain America
Symptom: Dead. Missing parts.
Board was a parts board being resurrected. Replaced 3 missing PALs and 8 missing EPROMs with ones from another parts board. Board still dead. Replaced a missing 5 pin 1k resistor network and resoldered a partially removed one. Board would then boot but had graphic corruption between player/enemy and backgrounds. It also played incorrect sounds.
Fixed bent/shorted pins between the character ROMs and the background ROMs to fix the graphic issue. Resoldered the 75 chip to fix the incorrect sound issue. Installed 2 missing 9 pin 1k resistor networks for player 3/4 controls. Tested.
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Model: Chain Reaction
Symptom: Corrupt Graphics
Patched corroded trace on daughter board and tested.
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Model: Psycho Nixs Oscar
Symptom: No sound
Cleaned edge connector and tested.
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Model: Captain America and the Avengers
Symptom: Dead.
NOTE: Board was struck on the MAN-06 mask ROM hard enough to crack it into 2.
Repaired a corroded trace to the left of the CPU and tested. Board worked but had graphic corruption. Replaced the MAN-08 mask ROM with a 27C800 EPROM and tested. Board still had corrupt graphics but would change with flexing. Reflowed the 52 and 71 customs and tested. Board looked much better but had some graphic corruption in repeatable locations.
Replaced the MAN-06 mask ROM that was paired with the -08 ROM and retested successfully.
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Model: Karate Champ
Symptom: No audio
Recapped audio section and tested.
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Model: Bad Dudes
Symptom: Scrolling upside down screen.
Patched a burned trace on the video ground pin on the JAMMA connector to fix the sync issue. Set the DIPs to put the screen back into normal orientation and tested.
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Model: Sly Spy
Symptom: Corrupt graphics
Patched a corroded trace to one of the graphics RAMs and tested.
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Model: Robocop
Symptom: Dead. Purple screen.
Straightened multiple bent pins on the surface mount customs on the CPU board. Two pins were mangled badly but were able to be straightened enough to not short to each other and to resolder to the board. Tested.
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Model: Burger Time
Symptom: Dead. Dirty board.
Cleaned boards. Replaced 16 corroded 24-pin sockets and 3 corroded 40-pin sockets. Cleaned the legs on the PSG2 AY-3-8910 sound chip. Replaced the sound 6502, 2732 EPROM, and PSG1 AY-3-8910 chips as they had rotted legs. Cleaned all the ROMs on the top board and reinserted them. Replaced 6 2732 Graphics EPROMs on the bottom board with rotted legs. Patched 2 traces to the Work RAM and the game would boot to a red screen of green half-diagonal blocks. Rearranged the graphics ROMs based on the schematic and the board booted to a blank red screen.
Patched a broken trace on the top board causing DIP Switch 1, switches 2-8 to not be read. Recapped the audio section and replaced 2 broken resistors. Game would not boot into self tests with a red screen and orange text, but the screens would fly by quickly. Patched multiple broken traces on the 74LS74 IC at 13F in the coin switch input circuit to fix the coin switch inputs which were used to switch self-test screens. Patched a bad trace on 6J, pin 6, to the graphics RAM at 8J, Pin 15, to fix the red screen issue. Patched more bad traces on the bottom board to finish getting the game running, but the colors were incorrect on the screen.
There is more than one boardset style to Burger Time! Found a picture online and rearranged the ROMs to match to fix the color issue. The positions listed in MAME do not match the board locations for the ROMs on this version of board. Tested.
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Model: Gate of Doom
Symptom: Corrupt graphics, lines on screen
Reflowed multiple customs with popped pins. Board would boot and play, but had bad colors and lines on the screen. Replaced one bad RAM and narrowed the lines to the custom IC labeled '55.' Sourced a replacement off a parts board, swapped out the 55, and patched a corroded trace to finish the repair. Tested.
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Model: Burger Time
Symptom: Garbage on screen. Dead.
Cleaned dirty ROM legs and straightened bent pins on the ROM at 10B. Tested - no sound. Cleaned dirty ROM legs on the sound ROM and retested successfully.
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Model: Break Thru
Symptom: Graphics missing
Board was missing the splash screens between levels, graphics on title screen, and moving background graphics flickered badly. Replaced both ribbon cables and tested. The old ribbon cables were very stiff and making poor connections where they were crimped.
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Model: Express Raider
Symptom: Dead
Replaced one of the 2 ribbon cables and tested.
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Model: Express Raider
Symptom: No audio
Replaced broken 470uf capacitor and cleaned the edge connector. Tested.
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Model: Mutant Fighter
Symptom: Dead
Stuck in reboot cycle.
Replaced missing ROM 10. If you push down on the CPU it stops rebooting. Reflowed custom 59 (CPU IC) and board booted, but had graphic corruption. Reflowed 2 sides of custom 55 and tested.
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Model: Locked N' Loaded
Symptom: No audio
Replaced dead audio amp IC and tested.
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Model: Bump N' Jump
Symptom: Dead. Garbage on screen.
This was a "fun" one... Replaced 3 Program ROMs, 1 Sound Program ROM, 2 of the 3 Character ROMs, and 2 Background ROMs. Replaced a bad Work RAM and a Sound Work RAM chip. Replaced a 74LS04 and a bad 74LS245 that had a short on the enable pin being driven by the 74LS04 that was replaced. Board would boot and clear the screen but would put up blocks. Replaced 2 bad 74LS194 chips in the Character ROM circuit, a bad 74LS04 with a stuck output, and a bad Bipolar PROM in the Horizontal timing section to restore the video. Board would boot to the title screen then the CPU would lock up. Traced through the address decoding and found where the board would read the TILT sensor before locking up. That circuit worked. When it locked up it would be stuck with a repeating high/low signal to the 74LS244 buffer on DIP Switch 1. Pins 1 and 19 were tied together and pin 19 of the LS244 read 320 ohms to +5v and 270 ohms to ground. Replaced the LS244 and successfully tested the game.
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Model: Robocop
Symptom: Dead
PAL at A2 was half out of its socket. Removed, straightened its pins, and reseated it. Top and bottom PCBs were not seated properly, reseated them and tested. No green. Cleaned edge connector and tested. Game had some corrupt graphics. Replaced missing IP17 ROM chip and tested. Game lost audio after 5 minutes. Recapped the audio section, removed a wire hack and capacitor bodge from the board and replaced the missing NF17 filter in the video ground circuit. Played game all the way to the end with much louder audio now with no failures.
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Model: Bad Dudes vs. Dragon Ninja
Symptom: White screen.
Replaced the physically broken sound capacitor, 3 bad Palette RAMs, and 1 bad CPU RAM. Board booted but both the main CPU and sound subsystem would freeze at random. Checked the board and found that 'random' meant, when the board was flexed. Replaced the 68000 CPU, YM2203C sound chip, and a 74LS245 bus latch that had broken pins where they met the PCB. Seems the board was severely bent, enough to pop some chip legs apart. Tested to find no sprites. The custom at 3C had no activity on the address and data lines going to the graphics ROMs and to the RAMs next to it. Found pin 117 was missing its signal. Patched the trace between pin 117 of the custom and pin 10 of the LS174 at C13. Tested.
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Model: RoboCop
Symptom: Dead. Garbage on screen.
68K CPU stuck with the /HALT line actively low. Checked address and data lines for activity. Checked control lines for activity. Each started up momentarily before the CPU halted. Dug deeper and found data lines 0 and 1 shorted on the far side of the 74LS245 latches. Followed the shorts to the 3 large surface mount custom ICs. Removed a solder short and tested.
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Model: Gondomania
Symptom: Burned input filter
Filter RP9 was burned on pin 7 and the body of the red filter was half burned. Replaced the filter and tested.
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Model: Vs. Bad Dudes
Symptom: Reboots when tapped
Straightened 6 SMT pins across 2 custom chips. Reflowed those pins. Tested.
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Model: Vs. Bad Dudes
Symptom: No blue
Repaired damaged trace under the video output transistors. Tested.
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Model: Bad Dudes
Symptom: Dead, garbage on screen.
Board arrived with a complaint of no audio but was dead.
Replaced 68K CPU as it had multiple broken pins on each end of the chip. (This boardset is vulnerable to bending which breaks those pins.) Replaced missing RCDM-I1 protection SIP on control inputs. Replaced 74LS74 in the interrupt circuit on the sound CPU as it had stuck outputs. Replaced bad Sound RAM chip. Board now had sound, but was missing some of the effects. Replaced dead YM2203 sound chip and tested.