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 27th December 2009, 04:33 AM #31 mike49504   diyAudio Member   Join Date: Sep 2006 im 100% sure i didbnt have the pos and neg reversed all fets test good wondering what will disable the output side to i can see if the amp will power up
 27th December 2009, 04:44 AM #32 Perry Babin   diyAudio Member   Join Date: Nov 2003 Location: Louisiana Pulling the rectifiers will isolate the audio section but that's not likely going to accomplish anything because it's doing it with no remote voltage applied. What's the DC resistance across the B+ and ground terminals (disconnect the 12v power supply from the amp before measuring the resistance)? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links
 27th December 2009, 04:47 AM #33 mike49504   diyAudio Member   Join Date: Sep 2006 how do i measure that red probe on power black on ground meter set to?
 27th December 2009, 04:53 AM #34 Perry Babin   diyAudio Member   Join Date: Nov 2003 Location: Louisiana Yes. Meter set to ohms. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links
 27th December 2009, 05:08 AM #35 mike49504   diyAudio Member   Join Date: Sep 2006 Ok Perry i found the problem there was a solder bridge from the pos to ground ill check the voltages on the 494 and post again in 2 mins
 27th December 2009, 05:15 AM #36 mike49504   diyAudio Member   Join Date: Sep 2006 tl494 pin1=0 pin2=4.15 pin3=4.73 pin4=0.22 pin5=1.40 pin6=3.37 pin7=0 pin8=13.91 pin9=0 pin10=0 pin11=13.90 pin12=13.91 pin13=4.90 pin14=4.90 pin15=4.90 pin16=12.89
 27th December 2009, 05:49 AM #37 Perry Babin   diyAudio Member   Join Date: Nov 2003 Location: Louisiana Pin 16 is causing pin 3 to go high which is shutting down the supply. Is there an op-amp near the 494? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links
 27th December 2009, 06:03 AM #38 mike49504   diyAudio Member   Join Date: Sep 2006 all i see is a lm324n next to the tl494
 27th December 2009, 06:20 AM #39 Perry Babin   diyAudio Member   Join Date: Nov 2003 Location: Louisiana Post the voltages on that IC. LM324 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 * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links
 27th December 2009, 06:33 AM #40 mike49504   diyAudio Member   Join Date: Sep 2006 lm324n pin1=0.67 pin2=0.67 pin3=0.67 pin4=0.70 pin5=.04 pin6=2.54 pin7=.06 pin8=0 pin9=0.64 pin10=1.93 pin11=0 pin12=0.64 pin13=2.54 pin14=1.89 if this thing is bad can i sub something else for it or do i need the the orginal

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