richardpp
Active Member
Hi,
I'm trying to repair an Akai Receiver, Model AA-R22L.
I've replaced the STK-1844 module and everything is fine except for a low level noise which is common to both channels and not responsive to volume control, but can be made worse by manipulating the tone control. It follows the audio signal, i.e. no signal no noise and is similar to the sound of radio station when not tuned in properly. It is present on all inputs.
I have the schematics but with so many IC's on board, (it's logic controlled so no pots either), it's beyond my ability to troubleshoot. I have tried freeze spray on a few of the transistors on various boards with no effect. Could it be caused by oscillation from the replacement module?
Any suggestions of where I should be looking would be kindly appreciated.
Cheers
I'm trying to repair an Akai Receiver, Model AA-R22L.
I've replaced the STK-1844 module and everything is fine except for a low level noise which is common to both channels and not responsive to volume control, but can be made worse by manipulating the tone control. It follows the audio signal, i.e. no signal no noise and is similar to the sound of radio station when not tuned in properly. It is present on all inputs.
I have the schematics but with so many IC's on board, (it's logic controlled so no pots either), it's beyond my ability to troubleshoot. I have tried freeze spray on a few of the transistors on various boards with no effect. Could it be caused by oscillation from the replacement module?
Any suggestions of where I should be looking would be kindly appreciated.
Cheers