Punch 40DSM no output on either channel - Page 3 - diyAudio
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Old 25th June 2010, 06:11 PM   #21
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What's the voltage at the other end of the bias adjustment?

Does the emitter of Q112 follow the voltage on the base of Q112 (-0.6v)?
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Old 25th June 2010, 06:51 PM   #22
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With the pot full CW it reads ~10.24Vdc and yes the emitter follows the base.
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Old 25th June 2010, 07:00 PM   #23
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When you installed C101, could you possibly have installed it backwards?

Confirm that the wiper of the bias pot goes from 0v to approximately -8v.
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Old 25th June 2010, 07:22 PM   #24
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C101 is installed correctly. The wiper goes from -185mV to -9V.
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Old 25th June 2010, 08:06 PM   #25
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It appears that the problem is in this CCS but it's strange that both channels have the same problem, or do they?

You stated that the voltage across R112 and R113 was pulsing. Is is possible the same thing is happening across R106?
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Old 25th June 2010, 09:13 PM   #26
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The other channel has the different style card. They act the same as no output and no DC on it. R106 is solid 75mV across it. Not sure if I should just changing transistors until I find it or not.
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Old 25th June 2010, 09:41 PM   #27
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Does R206 in the other channel have less than a volt across it?
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Old 25th June 2010, 11:55 PM   #28
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R206 shows 40mV across it only after I remove Q201.
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Old 26th June 2010, 09:19 AM   #29
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I'm going to have to borrow an amp so I can measure the voltage on a few points. I'll get back to you when I get it.
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Old 26th June 2010, 11:23 AM   #30
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Brandes, you stated that the cards were different, on the card that is different from the one Perry posted pictures of, is there a surface mount resistor on the top left corner that may have bad solder joints?
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