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5th March 2013, 09:46 PM
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#1 |
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diyAudio Member
Join Date: Jun 2012
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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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5th March 2013, 11:22 PM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Did you have the 'regulators' clamped down when you applied power?
Was the preamp board plugged in?
__________________
Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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6th March 2013, 01:12 AM
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#3 |
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diyAudio Member
Join Date: Jun 2012
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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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6th March 2013, 01:23 AM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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6th March 2013, 10:50 AM
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#5 |
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diyAudio Member
Join Date: Jun 2012
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DO you happen to know te part number for the regulators??
They are marked H5P |
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6th March 2013, 11:58 AM
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#6 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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7th March 2013, 11:01 AM
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#7 |
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diyAudio Member
Join Date: Jun 2012
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Does anyone know the value of R123 it sits in front of the IRF540
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7th March 2013, 11:40 AM
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#8 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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1k
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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9th March 2013, 08:24 PM
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#9 |
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diyAudio Member
Join Date: Jun 2012
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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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9th March 2013, 09:46 PM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Post the DC voltage on both op-amps near the 3120s.
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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