Juror22
Well-known member
First, this is an SE/30 that I have had for a really long time and it was one of my first ones that was re-capped and retro-brited so very, very long ago. Also, although I recall it working well following the re-cap, in the intervening years a lot of things went wrong with this particular machine. It lost the ability to startup the last time I got it out and at that time I began working on getting it to at least start.
After changing out the faulty power supply with a working one, I found there were multiple issues with the AB board that I could never quite sort out and I finally went the easy route and replaced it with another (story posted here)
Sooo, at the end of that, I had a working SE/30 with a static noise on startup where a beep should be. I found several references to a situation like this…
This was the first that I found…no specific details on a fix, but it helped me find some additional links.
…like this, which gave me specific areas to look
SE/30 sound issues
Based on this discussion, I took a closer look at my motherboard recap, which was effective, but pretty sketchy (to be honest), since it was one of my earliest attempts.
So first I tried a simple do-over, but that did not improve the situation.
Next I checked out the power and then put the board in another known working SE/30 and it demonstrated identical symptoms. After that, I looked more closely at the traces, as described in the post and sure enough, there were areas were the mask was gone and shorting to the cap leads.
Unfortunately, after re-cleaning the board, repairing the damaged areas with UV mask and recapping the board (I checked afterward with my meter to be sure) the issue remains, although the board looks much nicer…btw it appears that the repaired trace leads from the pos lead of C6 to pin7 of UB11.
An additional item that I noticed is that my issue appears to be tied to the SCSI activity as well. I did not notice this initially, but when I had a Syquest drive hooked up externally, the static was noticeable in the background and and varied in intensity according to the disk access, so I will have to continue looking for a cause.
There is another link with this, which appears unrelated, but might be my next stop…just because it focuses on checking parts of the sound circuit.
My SE/30 is fixed!
After changing out the faulty power supply with a working one, I found there were multiple issues with the AB board that I could never quite sort out and I finally went the easy route and replaced it with another (story posted here)
Sooo, at the end of that, I had a working SE/30 with a static noise on startup where a beep should be. I found several references to a situation like this…
This was the first that I found…no specific details on a fix, but it helped me find some additional links.
…like this, which gave me specific areas to look
SE/30 sound issues
Based on this discussion, I took a closer look at my motherboard recap, which was effective, but pretty sketchy (to be honest), since it was one of my earliest attempts.
So first I tried a simple do-over, but that did not improve the situation.
Next I checked out the power and then put the board in another known working SE/30 and it demonstrated identical symptoms. After that, I looked more closely at the traces, as described in the post and sure enough, there were areas were the mask was gone and shorting to the cap leads.
Unfortunately, after re-cleaning the board, repairing the damaged areas with UV mask and recapping the board (I checked afterward with my meter to be sure) the issue remains, although the board looks much nicer…btw it appears that the repaired trace leads from the pos lead of C6 to pin7 of UB11.
An additional item that I noticed is that my issue appears to be tied to the SCSI activity as well. I did not notice this initially, but when I had a Syquest drive hooked up externally, the static was noticeable in the background and and varied in intensity according to the disk access, so I will have to continue looking for a cause.
There is another link with this, which appears unrelated, but might be my next stop…just because it focuses on checking parts of the sound circuit.
My SE/30 is fixed!
