bstnguy
Well-known member
Got a Gorf boardset that boots and goes into attract mode on the bench.
Put it in a cabaret cabinet, get the Ram Error yellow jailbars.
What I've done so far:
Verified getting good -5VDC in the cabinet and other voltages (running switcher adapter)
Replaced RAM/ROM RAMs (couple were bad)
Fixed a bad video RGB board (Was dragging down the 5VDC and causing reset)
Replaced a 74LS245 on the Microprocessor board
Other odd thing it does is it won't run the RAM Test EPROM on the bench (either Marks or the other one) but I can force it to run correctly using a Fluke 9010a.
Suggestions?
Put it in a cabaret cabinet, get the Ram Error yellow jailbars.
What I've done so far:
Verified getting good -5VDC in the cabinet and other voltages (running switcher adapter)
Replaced RAM/ROM RAMs (couple were bad)
Fixed a bad video RGB board (Was dragging down the 5VDC and causing reset)
Replaced a 74LS245 on the Microprocessor board
Other odd thing it does is it won't run the RAM Test EPROM on the bench (either Marks or the other one) but I can force it to run correctly using a Fluke 9010a.
Suggestions?