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Old 4th July 2012, 10:35 PM   #11
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What about the DC voltage?

If you set the meter to AC volts and touch the probes across the 12v power supply terminals, what does it read?
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Old 5th July 2012, 12:23 AM   #12
Jatruh is offline Jatruh  United States
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There is about 70-80 volts DC on and off, keeps flashing my meter like it needs a higher setting?
I have it on 200 DC setting...
If i put the leads across the power supply it reads 29.6 volts AC.
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Old 5th July 2012, 01:02 AM   #13
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This meter isn't likely to be reliable for critical measurements, especially for AC since the AC circuit didn't read 0v when touched to the DC power supply.

The most common fault in these amps when you have DC that's causing the amp to shut down is a faulty LM361 (U14).

Measure the DC voltage on pins 9 and 11 of U14. Place the black probe on the negative speaker terminal. Post the voltage on those two terminals.
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Old 5th July 2012, 01:21 AM   #14
Jatruh is offline Jatruh  United States
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LM361
Pin 9: -0.05
Pin 11: 0.48
Also it looks as tho the LM361 might have been replaced because the top is all scratched like someone tried to erase the numbers. U12 also has been scratched off.
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Old 5th July 2012, 01:23 AM   #15
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The amp manufacturer defaces the ICs.

Those are inconclusive.

Post the DC voltage on all pins of U14. Copy and paste the following into your reply.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
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Old 5th July 2012, 02:00 AM   #16
Jatruh is offline Jatruh  United States
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Pin 1: 11.75
Pin 2: 0.00
Pin 3: -0.01
Pin 4: -0.03
Pin 5: 0.00
Pin 6: -11.91
Pin 7: 0.00
Pin 8: 2.90
Pin 9: -0.07
Pin 10: -1.85
Pin 11: 0.49
Pin 12: 0.00
Pin 13: 2.90
Pin 14: 2.90
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Old 5th July 2012, 05:13 AM   #17
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I don't see anything significantly wrong there.

With your meter set to ohms, confirm that you read 0 ohms between the point indicated by the arrow and any terminal of the outer output filter inductors. If so, when the amp on, measure the DC voltage on the point indicated by the arrow, black probe on the negative speaker terminal.
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Old 5th July 2012, 10:03 PM   #18
Jatruh is offline Jatruh  United States
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O.K. all terminals zero out and no DC on that point...
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Old 5th July 2012, 10:13 PM   #19
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Drive a strong audio signal into the amplifier and check for AC voltage on that point. The AC voltage should correspond to the level of audio driven into the amp.
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Old 5th July 2012, 10:20 PM   #20
Jatruh is offline Jatruh  United States
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Yes it goes up and down with the volume. Up to about 62 volts AC
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