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Old 6th July 2012, 01:08 AM   #1
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Default DHD NTX-3105

Amp powers up but no output..

Amp is producing both + _ rail voltages and both + - regulated voltages but still no output..

Any suggestions ?
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Old 6th July 2012, 01:35 AM   #2
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Post a photo of the inside of the amp.
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Old 6th July 2012, 01:51 AM   #3
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Heres a couple of pics let me know if you need more
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File Type: jpg DHD.JPG (708.9 KB, 42 views)
File Type: jpg DHD 1.JPG (766.8 KB, 41 views)
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Old 6th July 2012, 03:10 AM   #4
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Have you operated all switches and potentiometers through their entire range to see if the audio ever played through normally?

If it did not, remove QM1 to see if that allows that channel to produce audio.
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Old 6th July 2012, 03:20 AM   #5
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I cleaned all switches with contact cleaner and amp never produced audio


If i remove QM1 I get clean audio from left channel
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Old 6th July 2012, 04:31 AM   #6
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You'll need to follow the circuit back from pin 3 of that transistor to see what's driving it.
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Old 6th July 2012, 07:55 PM   #7
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Its being driven by QP6 an C2316 transistor.. Is there a good sub for that ?
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Old 6th July 2012, 08:02 PM   #8
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The problem may be farther back in the circuit. Did you check the transistor to determine if it was defective?

If it's not defective, you'll have to follow the circuit back from the base of QP6 to see what drives it.

While you have it out of the circuit, reinstall QM1 to see if both channels will produce clean audio.
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Old 6th July 2012, 09:01 PM   #9
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If i remove QP6 and reinstall QM1 the amp doesnt produce audio..


QP6 tested fine out of circuit..

So I need to follow it back further ?
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Old 6th July 2012, 09:06 PM   #10
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Post the highest resolution photo that you can of the area shown in the photo below.
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