dirving
Member
Hi guys,
So this Centipede upright has been working for me since my last repair a year or so ago. I went to turn it on the other day and it appears to have lost sync and I can't for the life of me figure out why. Here's what I've done so far to troubleshoot:
1. Checked all connections, cleaned edge connectors, etc
2. Swapped out monitors with a known working one. Same issue
3. It was wired for positive sync, changed it to use the composite negative sync. No change
4. Played with H. HOLD, V. HOLD, etc on both monitors, changes have no effect
5. Replaced both 7407 chips (for both sync styles) at A9 and A/B10, no effect.
6. Cried and cursed most gods. No effect.
(Also, worth mentioning that game plays blind)
Any insight as to where to look next would be much appreciated.
Thanks,
Dave
So this Centipede upright has been working for me since my last repair a year or so ago. I went to turn it on the other day and it appears to have lost sync and I can't for the life of me figure out why. Here's what I've done so far to troubleshoot:
1. Checked all connections, cleaned edge connectors, etc
2. Swapped out monitors with a known working one. Same issue
3. It was wired for positive sync, changed it to use the composite negative sync. No change
4. Played with H. HOLD, V. HOLD, etc on both monitors, changes have no effect
5. Replaced both 7407 chips (for both sync styles) at A9 and A/B10, no effect.
6. Cried and cursed most gods. No effect.
(Also, worth mentioning that game plays blind)
Any insight as to where to look next would be much appreciated.
Thanks,
Dave