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Hi @ all,
i have an old Roland amplifier 120JC.
He worked a long time very well, but now the sound control at channel 2 does not work longer. Treble, middle and bass are out of function. Loudness ist working correctly.
I don't know the manufakturing year but the serial number is 646541.
All shematics that i had found are not compatible with my amp. These amplifier has 2 preamps per channel an a small relais on the PCB on channel 2.
The potis were checkt with an oscilloscope and they are working.
Attached you find a picture of the PCB of channel 2.
Does anyone can help me to fix this problem?
greets Bobby
i have an old Roland amplifier 120JC.
He worked a long time very well, but now the sound control at channel 2 does not work longer. Treble, middle and bass are out of function. Loudness ist working correctly.
I don't know the manufakturing year but the serial number is 646541.
All shematics that i had found are not compatible with my amp. These amplifier has 2 preamps per channel an a small relais on the PCB on channel 2.
The potis were checkt with an oscilloscope and they are working.
Attached you find a picture of the PCB of channel 2.
Does anyone can help me to fix this problem?
greets Bobby
Attached Files