Difference between revisions of "PCB Repair Logs Stargate"
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'''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/4768-Williams Stargate PCB Repair]<br> | '''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/4768-Williams Stargate PCB Repair]<br> | ||
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=== Stargate CPU board 5770-09656-00 === | |||
'''Problem:''' When I first turned the pcb on there was rubbish on the screen, only about 1/3 of the screen from the center was showing, some sort of vertical collapse. | '''Problem:''' When I first turned the pcb on there was rubbish on the screen, only about 1/3 of the screen from the center was showing, some sort of vertical collapse.<br> | ||
'''Fix:''' Bad 7411@3A | '''Fix:''' Bad 7411@3A | ||
'''Problem:''' From what I could tell from the digital display on the rom board the game was booting without errors then resetting, as above all that was on the screen was a garbled mess. | '''Problem:''' From what I could tell from the digital display on the rom board the game was booting without errors then resetting, as above all that was on the screen was a garbled mess.<br> | ||
'''Fix:''' cut a long story short the output on pin 3 on a 7432 @ 6E | '''Fix:''' cut a long story short the output on pin 3 on a 7432 @ 6E | ||
'''Problem:''' Game would boot and get up to the "INITIAL TESTS INDICATE ALL SYSTEMS GO" then reset. | '''Problem:''' Game would boot and get up to the "INITIAL TESTS INDICATE ALL SYSTEMS GO" then reset.<br> | ||
'''Fix:''' Shit of a fault took me awhile to track down. Bad 5514 Cmos Ram @ 1C | '''Fix:''' Shit of a fault took me awhile to track down. Bad 5514 Cmos Ram @ 1C | ||
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Things to do: Needs the BS.BA inversion hack done so this pcb can run Robotron, Joust etc.<br> | Things to do: Needs the BS.BA inversion hack done so this pcb can run Robotron, Joust etc.<br> | ||
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=== CPU board 5770-09656-00 REV B === | |||
'''Problem:''' Missing Red and Green. | '''Problem:''' Missing Red and Green.<br> | ||
'''Fix:''' Missing 2 2N4403 transistors Q1 and Q2, substituted equivalent pair of 2N3906 I found on a scrap Atari 2600. | '''Fix:''' Missing 2 2N4403 transistors Q1 and Q2, substituted equivalent pair of 2N3906 I found on a scrap Atari 2600. | ||
Revision as of 07:10, 15 August 2012
Stargate
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| PCB Image | Reserved |
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| Pin Out | Reserved |
Repairer: Arcade King
Forum Thread: Stargate PCB Repair
Stargate CPU board 5770-09656-00
Problem: When I first turned the pcb on there was rubbish on the screen, only about 1/3 of the screen from the center was showing, some sort of vertical collapse.
Fix: Bad 7411@3A
Problem: From what I could tell from the digital display on the rom board the game was booting without errors then resetting, as above all that was on the screen was a garbled mess.
Fix: cut a long story short the output on pin 3 on a 7432 @ 6E
Problem: Game would boot and get up to the "INITIAL TESTS INDICATE ALL SYSTEMS GO" then reset.
Fix: Shit of a fault took me awhile to track down. Bad 5514 Cmos Ram @ 1C
Other things done to PCB: Replaced CPU socket, Cleaned interconnect cable pins, would have to sit there playing with them to get it to boot.
Things to do: Needs the BS.BA inversion hack done so this pcb can run Robotron, Joust etc.
CPU board 5770-09656-00 REV B
Problem: Missing Red and Green.
Fix: Missing 2 2N4403 transistors Q1 and Q2, substituted equivalent pair of 2N3906 I found on a scrap Atari 2600.
Problem: Game boots with "HIGH SCORE TABLE RESET BOOKKEEPING TOTALS CLEARED ADJUSTMENT FAILURE ETC ETC"
Fix: Another missing transistor Q13 2N4401 substituted with equivalent 2N3904 pulled off scap Atari 2600, Tranny is connected to the CE of the CMOS.
