Check the usual suspects:Forgotten solder joint,
Bad solder joint (reflow suspicious joints),
Reversed components (transformer,s electrolytics, diodes, transistors, IC's). In case of IC's, probably destroyed, better replace,
Flipped IC's or transistors,
Trim all the component leads and test pins as short as possible. Nothing must touch the chassis plate.
Check the DC voltages:Check the supply voltages as described in the setup guide.
Check the side chain:Set the compressor as described in step 9 of the setup guide.
Remove the jumper on JMP1.
Inject a 1VAC sine signal into the input.
| Threshold switch position | | TP4 & TP5 AC voltage | | JMP1 pin1 DC voltage |
| +6dB | | 0.11V | | 0.14V |
| 0dB | | 0.22V | | 3V |
| -6dB | | 0.45V | | 10.8V |
| -21dB | | 2.4V | | 15V |
