I think MS9 schematic may be wrong?
I have a few of these various chassis for my games so that is how I am able to easily bounce to check parts and swap.
I have an auto sync Nanao MS9 with no sync. I believe something shorted to ground and wrecked it long time ago. Unfortunately no good manual/schematic. I Pull up the manual sync MS9 guide from sega touring. Follow through block diagram and troubleshooting guide:
Check q101, u101. No problem, Look up parts in manual and I change both and still nothing. No Sync wave on TP1 (Working ms9 will happily show sync wave here). I visually compare against a manual sync ms9 and notice differences at C108, C110, R121. OK no problem, maybe because it's manual sync. I pull another auto sync from one of my games. Match auto sync to auto sync so they should be the same. I swap with a working q101, u101 and nothing. Same issue.
While I'm testing I notice working q101 Tests as PNP transistor (FR-15). Strange parts list shows 2SC2412K
I check schematic shows NPN.
Check DATA sheet... shows NPN.
Something isn't adding up....
I Check Q201.... Manual says 2SA1037K...different part number
PNP this time,
MS9 schematic shows PNP correctly
tests as PNP.... exact same FR-15 transistor install on board.
Now
Check Q401, maual says same as Q101,
schematic shows NPN... Reads as NPN markings are different BQ-25.
I still need to track down why I don't have horz sync line, but I don't think I can follow scheamtic properly and I may need to trace down what other problem may have been cause with NPN transistor in Q101 position.
Am I dumb? Don't answer that... am I wrong? Both manual and auto sync show incorrect q101.
I have a few of these various chassis for my games so that is how I am able to easily bounce to check parts and swap.
I have an auto sync Nanao MS9 with no sync. I believe something shorted to ground and wrecked it long time ago. Unfortunately no good manual/schematic. I Pull up the manual sync MS9 guide from sega touring. Follow through block diagram and troubleshooting guide:
Check q101, u101. No problem, Look up parts in manual and I change both and still nothing. No Sync wave on TP1 (Working ms9 will happily show sync wave here). I visually compare against a manual sync ms9 and notice differences at C108, C110, R121. OK no problem, maybe because it's manual sync. I pull another auto sync from one of my games. Match auto sync to auto sync so they should be the same. I swap with a working q101, u101 and nothing. Same issue.
While I'm testing I notice working q101 Tests as PNP transistor (FR-15). Strange parts list shows 2SC2412K
I check schematic shows NPN.
Check DATA sheet... shows NPN.
Something isn't adding up....
I Check Q201.... Manual says 2SA1037K...different part number
PNP this time,
MS9 schematic shows PNP correctly
tests as PNP.... exact same FR-15 transistor install on board.
Now
Check Q401, maual says same as Q101,
schematic shows NPN... Reads as NPN markings are different BQ-25.
I still need to track down why I don't have horz sync line, but I don't think I can follow scheamtic properly and I may need to trace down what other problem may have been cause with NPN transistor in Q101 position.
Am I dumb? Don't answer that... am I wrong? Both manual and auto sync show incorrect q101.
