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3rd January 2013, 09:36 PM
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#31 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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You cannot rely on voltage within the feedback loop when the loop is open (which it is with no outputs in the circuit).
Reinstall the outputs.
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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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3rd January 2013, 09:52 PM
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#32 |
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diyAudio Member
Join Date: Jun 2012
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With all the outputs and drivers installed in the right channel heres what i get..
TIP31C Base:-53.3 Collector:52.9 Emitter:-52.6 TIP32C Base:-53.0 Collector:-53.1 Emitter:-52.6 |
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3rd January 2013, 10:02 PM
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#33 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Have you removed and checked all of the transistors in the channel for leakage and open junctions as well as shorts?
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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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3rd January 2013, 10:04 PM
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#34 |
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diyAudio Member
Join Date: Jun 2012
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Yes
all test good |
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3rd January 2013, 10:09 PM
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#35 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Post a good quality photo of the defective channel where all of the circuit board designations are legible.
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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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5th January 2013, 02:06 AM
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#36 |
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diyAudio Member
Join Date: Jun 2012
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heres a pic of the board..
If i remove transistor Q114 (red arrow pointin to it) The voltages will go back to normal on the drivers in the right channel and it will play clean audio but the audio is muted.. I replaced it with a new one and the voltage comes back.. Last edited by S Merlington; 5th January 2013 at 02:11 AM. |
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5th January 2013, 02:32 AM
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#37 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Is there any significant DC on J35?
Do you have clean audio there.
__________________
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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5th January 2013, 02:37 AM
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#38 |
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diyAudio Member
Join Date: Jun 2012
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On J35 i have -3.83 volts
I dont have clean audio on J35 |
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5th January 2013, 02:41 AM
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#39 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Remove the transistor just below the circuit board designation R224 in the photo. Does that eliminate the DC on that jumper?
__________________
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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5th January 2013, 02:43 AM
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#40 |
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diyAudio Member
Join Date: Jun 2012
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No
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