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, 06:38:52 PM
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Model: Out Zone
Symptom: Dead
Game would sometimes try to start but the address and data busses on the CPU would stop running in about 2 seconds. Resoldered 2 surface mount ICs and replaced a bad 68000-10 CPU.
Game would play but then would be stuck moving up. Replaced a broken SIP resistor network acting as a pull up on the game inputs to finish the repair.
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Model: Knuckle Bash
Symptom: Background and foreground graphics are corrupt
Reflowed custom IC at U13, replaced 2 corroded sockets (U58/U59), and patched one bad trace. Tested game.
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Model: Knuckle Bash
Symptom: Dead
Jumpered 6 broken traces. Board worked, but had garbage on screen. Reflowed custom IC at U13 and tested game.
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Model: Truxton 2
Symptom: Corrupt graphics
Reflowed 208 pin custom IC at U67 and tested.
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Model: Batsugun
Symptom: Streaking graphics
Board is overdriving the outputs. Replaced the 2 74HCT273 ICs on the output circuit and tested.
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Model: Hellfire
Tip: Jumper settings for ROMs
O = Jumper Open
C = Jumper in place
Main Program ROMs:
23C1000 ROM: JP1 O, JP2 C, JP3 O, JP4 O
27C301 EPROM: JP1 O, JP2 C, JP3 C, JP4 O
27C010 EPROM: JP1 C, JP2 O, JP3 O, JP4 C
Background ROMs:
23C1000 ROM: JP5 C, JP6 O, JP7 O, JP8 O
27C301 EPROM: JP5 C, JP6 O, JP7 O, JP8 C
27C010 EPROM: JP5 O, JP6 C, JP7 C, JP8 O
Sprite ROMs:
23C1000 ROM: JP9 O, JP10 O, JP11 C, JP12 O
27C301 EPROM: JP9 C, JP10 O, JP11 C, JP12 O
27C010 EPROM: JP9 O, JP10 C, JP11 O, JP12 C
These jumpers affect the whole bank.
Take caution when desoldering the power and ground traces on this PCB. They are very heavy and hard to desolder cleanly.
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Model: Hellfire
Symptom: Dead. Parts robbed.
Replaced missing ROMs with a set from a second board. Reset the ROM type jumpers for the Program ROMs. Tested. Board attempted to boot but had severe graphics corruption. Patched 3 dead traces for the dual-port video RAM. Board booted to a RAM CHECK FREE FF03FF ERROR message. Reflowed the SMT custom IC and patched one dead trace to fix the error. Board booted but had background corruption and no sprites. Patched trace on Background ROMs to fix background issues and tested. Patched multiple dead traces and replaced a previously installed socket and the PROM at 6B. Jumpered a pulled power pin plated thru hole on the PROM. Tested sprites successfully. Replaced 2 missing 470uf caps and 4 incorrect radial caps with axial caps in the sound section. Tested. Replaced all 28-pin background and sprite Mask ROM sockets with 32 pin sockets and set jumpers for EPROMs. Installed new ROM set. Tested.
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Model: Hellfire
Symptom: Dead. Parts robbed
Replaced a missing Sound Program ROM. Installed 4 sockets and 4 missing 2148-55 sprite RAMs. Installed a socket and a missing 74ALS163. Resoldered a partially removed 74ALS163. Jumpered 2 dead traces on the 2148-55 sprite RAMs. Tested. Sprites were corrupt. Replaced bad 74LS157 chips at 6J and 7J. Tested.