- Nov 25, 2019
- 54
- 18
- 8
- AGName
- supersega
- AG Join Date
- Jul 25, 2014
Hi folks,
Long time no talk.
I have been sent a few Sega CD model 1 boards to repair after someone else ripped a lot of vias and couldn't fix the rotting on the traces due to the leaky SMD caps. So far I have made a list of all the caps on the sub-board that must be fixed, and I cannot find a few of them. This may just turn into a "supersega, you need glasses" thread but I have looked everywhere and cannot find what C8 and C9 are connected to in the service manual schematic. The vias have been ripped off the board so I can't backtrack it easily, but I have a theory that I wrote down. I also noticed that C5 has a difference from the service manual on the Sega Wiki, where my negative end goes to R37 and not the resistor specified within the manual. See my spoiler below for the full list of caps...
I have a LOT of work cut out for me, now that I'm looking back... but I'd be really appreciative if someone could confirm/deny my findings who knows this sort of thing better than me, or may have a set of better eyes.
Long time no talk.
I have been sent a few Sega CD model 1 boards to repair after someone else ripped a lot of vias and couldn't fix the rotting on the traces due to the leaky SMD caps. So far I have made a list of all the caps on the sub-board that must be fixed, and I cannot find a few of them. This may just turn into a "supersega, you need glasses" thread but I have looked everywhere and cannot find what C8 and C9 are connected to in the service manual schematic. The vias have been ripped off the board so I can't backtrack it easily, but I have a theory that I wrote down. I also noticed that C5 has a difference from the service manual on the Sega Wiki, where my negative end goes to R37 and not the resistor specified within the manual. See my spoiler below for the full list of caps...
Sub Bd
C1: good
C2; + goes to IC3C Pin 8, - goes to R17
C3: + goes to PIN1 IC1, - goes to point for neg.
C4: + goes to top, - goes to bridged pins.
C5: + goes to IC4P1, - goes to R37 (NOTE), opposite side of what goes to C33+.
C6: good
C7: + goes to ?, - good.
C8: + goes side of R22, - goes to via (?)
C9: + goes to LC7883KM pin 27, - goes to point for neg (SURFACE)
C10: Surface
C11: + goes to LC7881M pin 16, - goes to ground
C12: Surface / + goes to LC7881M pin 2, - goes to ground.
C13: Good
C14: Good
C40: Positive to pin 5 on LC7883, - to ground.
C41: + surface, - good.
C42: + good, - ground (surface?)
C43: good.
C1: good
C2; + goes to IC3C Pin 8, - goes to R17
C3: + goes to PIN1 IC1, - goes to point for neg.
C4: + goes to top, - goes to bridged pins.
C5: + goes to IC4P1, - goes to R37 (NOTE), opposite side of what goes to C33+.
C6: good
C7: + goes to ?, - good.
C8: + goes side of R22, - goes to via (?)
C9: + goes to LC7883KM pin 27, - goes to point for neg (SURFACE)
C10: Surface
C11: + goes to LC7881M pin 16, - goes to ground
C12: Surface / + goes to LC7881M pin 2, - goes to ground.
C13: Good
C14: Good
C40: Positive to pin 5 on LC7883, - to ground.
C41: + surface, - good.
C42: + good, - ground (surface?)
C43: good.
I have a LOT of work cut out for me, now that I'm looking back... but I'd be really appreciative if someone could confirm/deny my findings who knows this sort of thing better than me, or may have a set of better eyes.