For these two transistors, the square pad is 1.
If the amp will power up without the 6488, remove it again.
If the amp will power up without the 6488, remove it again.
Seems I just created a new problem. When I went to desolder 6488, the caps apparently still had a charge on them. Had an arc that blew up 6488. The amp is now shutting down my power supply (sending it into protect mode). Any ideas of what else went too?
Does it shut it down without the remote voltage applied?
Are you sure you don't have a blob of solder or a bridge?
Are you sure you don't have a blob of solder or a bridge?
Measure the resistance from the gate to drain for each of the PS FETs. Does one read lower than the rest?
A driver may have been damaged.
Will it try to power up enough to see if one bank of FETs is heating while the other is staying cool?
Will it try to power up enough to see if one bank of FETs is heating while the other is staying cool?
Pull the two MPSA06 drivers. Does it still shut it down?
Watch the current draw and the heating of the FETs if it doesn't shut the supply down.
Watch the current draw and the heating of the FETs if it doesn't shut the supply down.
The ones near the 494, circled in the following post:
Once again need help fixing Orion HCCA 225 Digital Reference
Once again need help fixing Orion HCCA 225 Digital Reference
Power supply stayed running. Amp did not power up but does have +12volts at the PS FET's. Nothing is heating up.
They were both shorted. I replaced them along with the MSA56's in front of them. The amp powered up and almost immediately the PS Fets on the left side of the board(as to the left side in photo you attached on #71) started getting hot. I believe one shorted before I could shut the power down. I tested them after words and one has a different reading than the rest.
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