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Old 18th November 2012, 06:14 PM   #1
timwebb is offline timwebb  United States
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Default bigbang2400.1

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?
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Old 18th November 2012, 06:24 PM   #2
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Do you have rail-rail oscillation on the output transistors?

Do you have the master/slave switch set to master?
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Old 18th November 2012, 06:43 PM   #3
timwebb is offline timwebb  United States
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its set to master. and just check and i have no rail-rail oscillation.
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Old 18th November 2012, 06:51 PM   #4
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Does the amp go from protect to normal operation after a few seconds?
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Old 18th November 2012, 06:52 PM   #5
timwebb is offline timwebb  United States
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yes.
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Old 18th November 2012, 06:55 PM   #6
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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.
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Old 18th November 2012, 06:58 PM   #7
timwebb is offline timwebb  United States
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ok. thanks!
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Old 18th November 2012, 10:17 PM   #8
timwebb is offline timwebb  United States
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one of the 1277 have a low ohm reading from the rest. also. what is the diode in zd5? i keep forgetting?
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Old 19th November 2012, 03:30 AM   #9
timwebb is offline timwebb  United States
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i cant find the kta1277 transistor. i was looking at 2sa1156 to replace it
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Old 19th November 2012, 03:33 AM   #10
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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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