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timwebb 18th November 2012 06:14 PM

i bought this amp to fix. the issue was one irf1010e had a broke leg and put it into protect. but i cant get any audio from it period. i have rail pos-neg voltage and 13.8 pos and neg on the opamps. any thing im missing?

Perry Babin 18th November 2012 06:24 PM

Do you have rail-rail oscillation on the output transistors?

Do you have the master/slave switch set to master?

timwebb 18th November 2012 06:43 PM

its set to master. and just check and i have no rail-rail oscillation.

Perry Babin 18th November 2012 06:51 PM

Does the amp go from protect to normal operation after a few seconds?

timwebb 18th November 2012 06:52 PM


Perry Babin 18th November 2012 06:55 PM

I'd suspect one of the 3 transistors along the top edge of the driver board on the end nearest the power supply. You'll have to check for leakage as well as for open junctions.

timwebb 18th November 2012 06:58 PM

ok. thanks!

timwebb 18th November 2012 10:17 PM

one of the 1277 have a low ohm reading from the rest. also. what is the diode in zd5? i keep forgetting?

timwebb 19th November 2012 03:30 AM

i cant find the kta1277 transistor. i was looking at 2sa1156 to replace it

Perry Babin 19th November 2012 03:33 AM

I haven't checked the one on this board (which is a modified version of the more common driver board) but it's likely a 5.6vZ. It should be marked.

I'm assuming that you're referring to the one on the lower left corner of the board near the 10k resistor. On the photos I have, it appears to be a ZD6 but the silkscreening isn't very good.

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