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S Merlington 17th March 2013 06:51 PM

MY friend brought this amp over..

If the master/slave switch is in slave mode and the rca jacks plugged into the slave jack the amp will work but it wont let you adjust the gains,crossovers or anything..

If i put the switch in master and plug the rca jacks into the input i get no sound at all out of the amp...

I cleaned the switch but still nothing..

Any ideas where to start ??

timwebb 17th March 2013 07:48 PM

got a picture of it?

S Merlington 17th March 2013 08:56 PM

3 Attachment(s)
Heres a couple of pics of the board..

I found the 7915 regulator to be defective it had -23 volts on the 3rd leg replaced it and now i have -15 volts..

ON the D1302 muting transistor heres the voltages i get..

Black probe on leg 1 of the muting transistor

Leg 2:0.00
Leg 3:-15.04

Any ideas what to check??

timwebb 17th March 2013 09:47 PM

whats the burned ic on that board?

S Merlington 17th March 2013 10:57 PM

it just looks burnt in the pic it is not burnt

Perry Babin 17th March 2013 11:59 PM

Confirm with your meter that the contacts for the master position are reading 0 ohms. If it has two sections, check both the front and back sections. You should be able to do this without removing the board from the sink.

S Merlington 18th March 2013 12:33 AM

It starts at 0.02 ohms then climbs to 37.12K ohms..

Perry Babin 18th March 2013 12:42 AM

If the contacts don't read 0 ohms and remain there, the switch is defective.

Compare it to the other contacts when the switch is in the slave position.

S Merlington 18th March 2013 01:06 AM

I will unsolder it from the board and measure it I think its charging a cap

Perry Babin 18th March 2013 01:10 AM

You can't have caps charging if the contacts are closed. That would short any voltage across it.

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