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6th July 2012, 08:53 PM
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#1 |
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diyAudio Member
Join Date: Jun 2012
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Power Acoustic A3000DB
Anyone know the value of R101 it sits directly behind the rca jacks
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6th July 2012, 09:03 PM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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220 ohms.
This problem can be caused by a shorted transformer or by having the positive speaker output wire shorted to ground.
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6th July 2012, 09:08 PM
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#3 |
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diyAudio Member
Join Date: Jun 2012
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Would this also cause the amp not to power up?
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6th July 2012, 09:10 PM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Not by itself but I've seen quite a few amps come in with this resistor burned and the SG3525 blown.
Post the DC voltage on all pins of the 3525 if you can't determine why it's not powering up. Pin 1: Pin 2: Pin 3: Pin 4: Pin 5: Pin 6: Pin 7: Pin 8: Pin 9: Pin 10: Pin 11: Pin 12: Pin 13: Pin 14: Pin 15: Pin 16:
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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 July 2012, 09:19 PM
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#5 |
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diyAudio Member
Join Date: Jun 2012
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Pin 1: 0
Pin 2: 0.50 Pin 3: 0 Pin 4: 0 Pin 5: 0.21 Pin 6: 0 Pin 7: 0.18 Pin 8: 0.73 Pin 9: 0.50 Pin 10: 0 Pin 11: 0 Pin 12: 0 Pin 13: 11.88 Pin 14: 0 Pin 15: 11.88 Pin 16:0.50 |
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6th July 2012, 09:26 PM
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#6 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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The lack of 5v on pin 16 makes it appear to be defective. The problem could be the 3525 or something connected to pin 16 dragging the voltage down.
__________________
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 July 2012, 09:59 PM
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#7 |
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diyAudio Member
Join Date: Jun 2012
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You were correct the 3525 was defective..
Thanks for your help.. |
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