Desolder one of the terminals of the one that reads 4.18v.
Replace Q9 and see if the amp will power up normally (no jumper).
Replace Q9 and see if the amp will power up normally (no jumper).
This could not have caused the excessive current draw so you may have an intermittent problem. Try twisting/pushing/pulling on the transformer to see if it draws excessive current.
Do you have audio on all channels?
Do you have audio on all channels?
The transformer squeals when first powering up but goes away. After twisting and pulling the current draw stays the same at .80 amps. Audio is present on all 4 channels.
The input to the 339 was wrong on the thermistor section. The reference voltage was right so that meant that a thermistor was likely driving the voltage to the 339. The voltage on the thermistor told which it was.
Have a question for the group ,
I have a punch 160x4 but the board shows P4020 - PC-0929-C REV C
Did they use the 4020 board in the 160x4 or is this the wrong cover ?
I have a punch 160x4 but the board shows P4020 - PC-0929-C REV C
Did they use the 4020 board in the 160x4 or is this the wrong cover ?
Please don't post in a repair thread that was started by someone else unless you are trying to help them.
Start a new thread if you need help with a repair of your own.
http://www.bcae1.com/temp/newthreaddiy01.png
Start a new thread if you need help with a repair of your own.
http://www.bcae1.com/temp/newthreaddiy01.png