I just did a complete cap kit, including fuses, hot and flyback on a GO7-CBO that has never worked since its' been in my possession. The small fuse was blown but the big one was still good prior to the cap kit. I completed the cap kit, buttoned everything up, and fired it up. Picture was beautiful, looked good except I couldn't lock in Vertical sync.
Powered everything down, looked at Fromm's flowchart that says to check a couple transistors and the IC. I came back to power up my test rig to check out the monitor a bit more and when I plugged it in, I heard a fuse pop, no HV whine. No B+. Check the small fuse, it's blown again. Fromm's flowchart says this means the HOT is shorted, but it meters good. I didn't have the chassis bolted back in and I had lifted the monitor off my test bench and back onto it, so it's possible that the chassis had slid loose and was touching the metal frame. Any other ideas? Should I just replace the small fuse and try again?
Assuming replacing the fuse takes care of the problem, what should I do about the horizontal drift? Just replace the two transistors and the IC?
EDIT: http://forums.arcade-museum.com/showthread.php?t=71984&highlight=go7+drift&page=2 This thread indicates that to the G07 I need to hook the sync up differently? It's from a Missile Command which appears to use positive sync. However, on my test rig I'm running positive sync from the JAMMA board to pin 3 of the 3 pin connector. If I'm reading this thread right, I need to run that sync to pin 3 and jump it to pin 2? Is that right?
Powered everything down, looked at Fromm's flowchart that says to check a couple transistors and the IC. I came back to power up my test rig to check out the monitor a bit more and when I plugged it in, I heard a fuse pop, no HV whine. No B+. Check the small fuse, it's blown again. Fromm's flowchart says this means the HOT is shorted, but it meters good. I didn't have the chassis bolted back in and I had lifted the monitor off my test bench and back onto it, so it's possible that the chassis had slid loose and was touching the metal frame. Any other ideas? Should I just replace the small fuse and try again?
Assuming replacing the fuse takes care of the problem, what should I do about the horizontal drift? Just replace the two transistors and the IC?
EDIT: http://forums.arcade-museum.com/showthread.php?t=71984&highlight=go7+drift&page=2 This thread indicates that to the G07 I need to hook the sync up differently? It's from a Missile Command which appears to use positive sync. However, on my test rig I'm running positive sync from the JAMMA board to pin 3 of the 3 pin connector. If I'm reading this thread right, I need to run that sync to pin 3 and jump it to pin 2? Is that right?
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