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Old 27th December 2009, 06:36 AM   #41
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Pin 4 doesn't have any supply voltage. Follow the circuit back to see what's feeding that pin.
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Old 27th December 2009, 07:22 AM   #42
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what should i be looking for i traced it to a diode and that was ok but after that i dont know what usually feed it
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Old 27th December 2009, 07:35 AM   #43
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I would think it would go back to a transistor but it could be fed from the remote turn-on:
Remote -> diode -> pin 4.

On many amps, the op-amps used for the protection circuits are fed by the same circuit as pin 12 of the 494 so you should follow the traces to/from pin 12 of the 494 to see if there are any open traces between that circuit and pin 4 of the 324.

Remember traces can be on either side of the board and can pass under other components. It's possible for traces to open under those components.
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Old 27th December 2009, 07:51 AM   #44
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damn i lifted if off the board and traced it back to a tip 102 that is testing shorted ill replace that and then check the voltage
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Old 27th December 2009, 08:20 AM   #45
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ok no luck still 0.66 on pin 4. But the problem with the tip 102 is whoever worked on this amp before me fixed a broken trace and soldered it to the wrong leg on the 102.

after the diode the trace from pin4 goes back to a cap so ill lift it off then trace it back from there
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Old 27th December 2009, 08:40 AM   #46
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ok i replaced another tip102 in the amp and i think it kicked on but after 4 secs it will draw 60 amps of current so if i take out the fes16jt's will this disable the outputs to see if the power supply will start up
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Old 27th December 2009, 08:58 AM   #47
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Removing the rectifiers should completely isolate the audio section.

Have you re-checked the output transistors to see if any were shorted?
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Old 27th December 2009, 09:20 AM   #48
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ok i disabled the audio section . amp doesnt draw alit of current now. but theres still a problem in the supply theres only .69 on pin 4 of the 324 so i guess ill try to track it down later today .
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Old 27th December 2009, 09:39 AM   #49
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ok i think i found what drives pin 4 its an a1266 wondering if this can be crossed to something so i can see if i can get this amp running or do i need the 1266
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Old 27th December 2009, 09:41 AM   #50
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What PNP transistors do you have on hand?
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