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16th June 2011, 12:45 AM
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#1 |
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diyAudio Member
Join Date: Sep 2006
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Directed 1500D
All of the outputs are removed right now since some were defective..
Amp is still stuck in protection mode.. Heres what i get on the 494 Pin1:0 Pin2:4.96 Pin3:.05 Pin4:4.84 Pin5:1.46 Pin6:3.64 Pin7:0 Pin8:13.04 Pin9:0 Pin10:0 Pin11:13.04 Pin12:13.04 Pin13:4.96 Pin14:4.96 Pin15:4.96 Pin16:4.96 |
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16th June 2011, 05:32 AM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Post a photo of the inside of the amp.
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Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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16th June 2011, 05:57 PM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Re-check the voltage on pin 16. 13, 14 and 15 may be shorted together which would account for having precisely the same voltage on those but pin 16 wouldn't be shorted to those and is unlikely to have precisely the same voltage.
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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16th June 2011, 07:58 PM
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#7 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Do you see a pulse of DC on the large output filter inductors as the amp tries to power up?
Is pin 4 of the 494 connected to the collector of a PNP transistor (possibly through a low value resistor)?
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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16th June 2011, 07:59 PM
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#8 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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It's likely that pin 16 is connected to ground. The protection drive is coming in on pin 4.
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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16th June 2011, 08:13 PM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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DC offset must be what's shutting it down.
Post the DC voltage on all of the pins of the B52 IC. 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:
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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