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Old 13th February 2013, 07:00 PM   #11
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I dont believe pins 2 and 6 should have the voltage on them. I think this op-amp is defective.

It could be getting the voltage from U4 or U3. (TL072C)

Post the voltage on all the pins of U4 and U3, you could have a bad op-amp sending the voltage to U17.

Does the 0/180 switch make any difference?
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Last edited by seankane; 13th February 2013 at 07:04 PM.
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Old 13th February 2013, 07:24 PM   #12
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u3 u4
1, .651 1, 000
2, .651 2, .094
3, .642 3, .093
4, -12.48 4, -9.56
5, .642 5, 000
6, .649 6, .649
7, .648 7, .649
8, 13.91 8, 9.81

it makes no difference switching the 0/180 also output's are getting warm.
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Old 13th February 2013, 07:42 PM   #13
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Quote:
Originally Posted by amp it up View Post
u3 u4
1, .651 1, 000
2, .651 2, .094
3, .642 3, .093
4, -12.48 4, -9.56
5, .642 5, 000
6, .649 6, .649
7, .648 7, .649
8, 13.91 8, 9.81

it makes no difference switching the 0/180 also output's are getting warm.
Which outputs are getting warm, all of them or just one group of 6?

The .650 vdc on the pins of U3 doesnt seem right, but does not justify why the U17 has over 8vdc on its output pins.

I would say that the LM6171 (U17) is probably defective.

Is the amp screwed tightly into the heat sink?
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Old 13th February 2013, 07:47 PM   #14
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no the amp is not in the heat sink. it seemed to be all the outputs getting warm. looks like I need to order some parts! THANKS!!
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Old 13th February 2013, 07:52 PM   #15
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If the amp is not in the sink, the outputs will likely get warm after the amp has been powered up for awhile.

I would order some stock of the TL072C and the LM6171 to have on hand for this amp, maybe 3 or 4 each.

This may not be the only problem with the amp, but you must start with known faults.

You might see what others on the forum think, but having over 8vdc on the output pins of the op-amp is not OK.
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Old 13th February 2013, 07:55 PM   #16
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Ok Thank You Sean!!
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Old 13th February 2013, 08:03 PM   #17
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Will the TL072Cn work or the TL072Cd?
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Old 13th February 2013, 08:20 PM   #18
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Either will work just make sure you get it in the SO-8 package.
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Old 13th February 2013, 08:41 PM   #19
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Ok THANKS!
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Old 13th February 2013, 11:21 PM   #20
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U4 appears that it could be defective but with R31 out of the circuit, there shouldn't be any DC on the speaker terminals (if U4 was the only problem). It appears that you have full positive rail voltage on the speaker terminals. Is that correct?
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