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Old 3rd January 2013, 09:36 PM   #31
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You cannot rely on voltage within the feedback loop when the loop is open (which it is with no outputs in the circuit).

Reinstall the outputs.
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Old 3rd January 2013, 09:52 PM   #32
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With all the outputs and drivers installed in the right channel heres what i get..

TIP31C
Base:-53.3
Collector:52.9
Emitter:-52.6

TIP32C
Base:-53.0
Collector:-53.1
Emitter:-52.6
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Old 3rd January 2013, 10:02 PM   #33
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Have you removed and checked all of the transistors in the channel for leakage and open junctions as well as shorts?
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Old 3rd January 2013, 10:04 PM   #34
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Yes

all test good
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Old 3rd January 2013, 10:09 PM   #35
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Post a good quality photo of the defective channel where all of the circuit board designations are legible.
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Old 5th January 2013, 02:06 AM   #36
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heres a pic of the board..

If i remove transistor Q114 (red arrow pointin to it) The voltages will go back to normal on the drivers in the right channel and it will play clean audio but the audio is muted..

I replaced it with a new one and the voltage comes back..
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Last edited by S Merlington; 5th January 2013 at 02:11 AM.
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Old 5th January 2013, 02:32 AM   #37
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Is there any significant DC on J35?

Do you have clean audio there.
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Old 5th January 2013, 02:37 AM   #38
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On J35 i have -3.83 volts

I dont have clean audio on J35
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Old 5th January 2013, 02:41 AM   #39
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Remove the transistor just below the circuit board designation R224 in the photo. Does that eliminate the DC on that jumper?
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Old 5th January 2013, 02:43 AM   #40
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No
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