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Old 5th March 2013, 09:46 PM   #1
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Default MTX 81001

I just rebuilt the areas around both rectifier circuits ..

When i powerd the amp up it blew the 2 caps (C118 and C119) 10uf 100V It also burnt all 4 of the 1R0 resistors and possibly a few other things..

Any idea what might cause this to happen?
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Old 5th March 2013, 11:22 PM   #2
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Did you have the 'regulators' clamped down when you applied power?

Was the preamp board plugged in?
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Old 6th March 2013, 01:12 AM   #3
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Regulators were clamped down..

Preamp board was unplugged when i powerd it it..

It happend as soon as i touched the remote wire to the amp
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Old 6th March 2013, 01:23 AM   #4
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If it blew those two capacitors and they were no installed backwards, the regulators weren't regulating the voltage. When the capacitors shorted (or leaked excessively from over-voltage), that could have caused the resistors to fail.

Don't plug the preamp board in until you know that the regulators are working reliably.
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Old 6th March 2013, 10:50 AM   #5
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DO you happen to know te part number for the regulators??

They are marked H5P
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Old 6th March 2013, 11:58 AM   #6
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It's a 15v Zener diode. The mark is 5H. It could be an MMSZ5245BT1. Confirm the dimensions.
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Old 7th March 2013, 11:01 AM   #7
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Does anyone know the value of R123 it sits in front of the IRF540
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Old 7th March 2013, 11:40 AM   #8
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1k
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Old 9th March 2013, 08:24 PM   #9
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Rebuilt the areas around the regulators ..

Powerd the amp up and it powers up and idles fine..


Next problem i have is i have 7.62 volts on the output terminals measured directly across them..

All outputs test good ..

Any ideas what to check next?
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Old 9th March 2013, 09:46 PM   #10
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Post the DC voltage on both op-amps near the 3120s.
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