Got a Rodgers C-445 digital church organ to repair and no, I didn't bring the whole thing home.
Complaint: No audio, heard a pop in the speakers and it smells like burnt electronics.
So I called Rodgers for a service manual. Those things are not to find on the net and neither will Rodgers sell you one, rather they send you to their dealer network. Frig, if I want a schematic or service manual, I surely don't want the dealer network, as the next dealer is like 300km from here. Pfft.
Checked the linear PSU and found that the -12V rail was almost 0V and the +12V rail only like 5V, plus the heat sink getting quite warm on the 12V regulator. I unplugged the ribbon cable that goes from the PSU to the 4 channel preamp (board number 5218-30). Ha! -12V came back and the +12 V too.
The damage on the 4 channel preamp board:
After talking out the board, I noticed there wasn't a short to GND, rather the -12V and the +12V where shorted. Fixed the hole in the circuit board and repaired the corroded traces of the leaking caplythic juice, replaced C27, C28, C1 and C3. So hopefully that does the trick tomorrow when I put it back in.
BTW: I replaced the 4 caps with Panasonic FM series.
Complaint: No audio, heard a pop in the speakers and it smells like burnt electronics.
So I called Rodgers for a service manual. Those things are not to find on the net and neither will Rodgers sell you one, rather they send you to their dealer network. Frig, if I want a schematic or service manual, I surely don't want the dealer network, as the next dealer is like 300km from here. Pfft.
Checked the linear PSU and found that the -12V rail was almost 0V and the +12V rail only like 5V, plus the heat sink getting quite warm on the 12V regulator. I unplugged the ribbon cable that goes from the PSU to the 4 channel preamp (board number 5218-30). Ha! -12V came back and the +12 V too.
The damage on the 4 channel preamp board:
After talking out the board, I noticed there wasn't a short to GND, rather the -12V and the +12V where shorted. Fixed the hole in the circuit board and repaired the corroded traces of the leaking caplythic juice, replaced C27, C28, C1 and C3. So hopefully that does the trick tomorrow when I put it back in.
BTW: I replaced the 4 caps with Panasonic FM series.
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