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Hi,

I'm doing a cap replacement on a white cdrom2 unit, the unit had problems to read original disc's (sound loss) and music cd's (mostly sound skipping at the slightest tap on the table ) and after checking the caps and noticing how a lot of them had the telltale rust/residue on them, I decided to replace them, now the unit doesn't read cd's, with music cd's just strutter around the first track and I cannot select another one. So I think I have a botched cap replacement (yay!), right now I've have three questions:

• I've followed the replacement guide posted here, on the Guide sticky and I've noticed some differences, one, some caps are not oriented the same in the PCB, no prob as the polarity is written on the board, and two at least one cap, c202, had a different capacitance. The list says it should be  a 100uF cap but the one I pulled out from the board was 22uF, just in case I've replaced it with another 22. Did anyone of you found this before?, for those who did a cap change on a white cdrom drive, what capacitance do you have on your unit?, did you found this too or just follow the guide and everything works?.
   
• I've been checking the continuity between the board parst and the caps, most of them have continuity with the  the board components or ground, but I have problems with six of them (c129, c215, c219, c220, c223 and c303), I was wondering if there's a PCB diagram for this board somewhere I can follow or maybe someone knows to which compontes are these caps connected because I can't find them.
  
• Also, I've read that, sometimes, after changing the caps the optics must be calibrated again, but not always, Could be this the case?.

Thanks in advance guys.

I have a PC Engine Duo that had the caps replaced also and the music on game cd's stops with any slight bump also.Its like once its bumped it can't find where it was and doesn't play music until a track change. I'm interested to hear possible causes

Quote from: Dangeross on 06/25/2016, 12:16 AMI have a PC Engine Duo that had the caps replaced also and the music on game cd's stops with any slight bump also.Its like once its bumped it can't find where it was and doesn't play music until a track change. I'm interested to hear possible causes

This is completely normal. Any slight bump will cause music to stop and will not load again until you either die or load up the next audio track. These drives were made before electronic skip protection existed.

Quote from: Keith Courage on 06/25/2016, 04:54 AM

Quote from: Dangeross on 06/25/2016, 12:16 AMI have a PC Engine Duo that had the caps replaced also and the music on game cd's stops with any slight bump also.Its like once its bumped it can't find where it was and doesn't play music until a track change. I'm interested to hear possible causes

This is completely normal. Any slight bump will cause music to stop and will not load again until you either die or load up the next audio track. These drives were made before electronic skip protection existed.

Perfect, thanks. Just coincidence that I noticed it afterwards.