allen and heath pa12_cp powered unit

[plec.22]

This unit came in with weak to one side...so time to check things over..quick way would be to ensure line outs are ok followed speak test etc.

After contacting a uk dealer who sent over pdf file to start checking and signal/ volts....also found fx not working...note its high cost to send it off for repair at 50 Per hr...still this one needed a new fx pcb Plus reflow of dry solder cracks and making good the ribbon connects..

[plec.22]

It takes lots of service time to check this unit out...stick the coffee on...

[plec.22]

I did solve the main fault's in the end...repair to preamp supply plus a few safety resistors in the fx pcb board.

[jamesbondle]

Need the schematic anyone have it

[g1]

It's here: https://music-electronics-forum.com/...7&d=1382654612
Note that the speaker outputs (speakons) are wired 'out of phase'* from the factory. Also, the connector board can be re-assembled wrong as it is not keyed.
*(not really out of phase as amps are run out of phase and corrected at the speaker out speakons. They say this is done to optimize loading of power supply)

[jamesbondle]

Thank you g1