tmcw
New member
Got one of these recently as a project. Not working, but cabinet, top-glass and control panels in lovely condition.
Boards look pretty good too, though the power supply board looks like it got a bit scorched at some point, but the damaged trace has been repaired, and all circuits are good.
CPU board has been upgraded for the 4164 RAM, and has the relevant adapter which checks out ok.
I've reflowed the solder on all the connections, but I'm still getting a 1-3-1 on the 7-seg LED display. Monitor displays a constantly cycling "rug" pattern, though it's not exactly the same as I'd seen running in MAME; it seems to exhibit some vertical "banding" which isn't entirely of the same randomness as the typical rug pattern.
Anyhow, I've checked the voltages coming off the power board, and getting the following:
Pin 1: -4.99v
Pin 3: 11.43v
Pin 4: -14.37v
Pins 5, 6: 10.10v
Pins 12 and 13: 4.82v
Pin 14: 4.57v
From this I gather that only the -5v is ok. Pin 4 is supposed to be -12v; is -14.37v bad here? What about the others? Any suggestions on what I need to do to get this power supply good again?
Also, I was wondering if something on any of the boards could be damaged by NOT using the 4164 adaptor with the new RAM in place?
Thanks.
Boards look pretty good too, though the power supply board looks like it got a bit scorched at some point, but the damaged trace has been repaired, and all circuits are good.
CPU board has been upgraded for the 4164 RAM, and has the relevant adapter which checks out ok.
I've reflowed the solder on all the connections, but I'm still getting a 1-3-1 on the 7-seg LED display. Monitor displays a constantly cycling "rug" pattern, though it's not exactly the same as I'd seen running in MAME; it seems to exhibit some vertical "banding" which isn't entirely of the same randomness as the typical rug pattern.
Anyhow, I've checked the voltages coming off the power board, and getting the following:
Pin 1: -4.99v
Pin 3: 11.43v
Pin 4: -14.37v
Pins 5, 6: 10.10v
Pins 12 and 13: 4.82v
Pin 14: 4.57v
From this I gather that only the -5v is ok. Pin 4 is supposed to be -12v; is -14.37v bad here? What about the others? Any suggestions on what I need to do to get this power supply good again?
Also, I was wondering if something on any of the boards could be damaged by NOT using the 4164 adaptor with the new RAM in place?
Thanks.
