hey guys,
i've got 2x roland KC-550's here. my friend asked me to take a look at them for him.
both amps have the same symptoms, and he swears they were never abused.
here's the deal: everything powers on, but no sound to the headphone jack or speakers.
i pulled out the speaker and examined the power amp in each one and i found that both had burn
damage marks behind R41. i can't find a schematic anywhere, so i'm not sure what R41 does.
i tested the Left and Right power transistors in each amp for shorts and found nothing.
all fuses are also intact.
my plan right now is to replace R41 and see what happens... but, i'm wondering why it would've blown.
any suggestions? i'll report back w/ any new developments after replacing R41.
i've got 2x roland KC-550's here. my friend asked me to take a look at them for him.
both amps have the same symptoms, and he swears they were never abused.
here's the deal: everything powers on, but no sound to the headphone jack or speakers.
i pulled out the speaker and examined the power amp in each one and i found that both had burn
damage marks behind R41. i can't find a schematic anywhere, so i'm not sure what R41 does.
i tested the Left and Right power transistors in each amp for shorts and found nothing.
all fuses are also intact.
my plan right now is to replace R41 and see what happens... but, i'm wondering why it would've blown.
any suggestions? i'll report back w/ any new developments after replacing R41.
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