RF Power 1001bd Dead... but how?? - diyAudio
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Old 2nd May 2014, 10:36 PM   #1
jlind54 is offline jlind54  United States
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Join Date: Nov 2012
Location: Kansas
Default RF Power 1001bd Dead... but how??

I've had this amp for a while, hasn't been used in a while because I pulled it out of a car I traded in. Its been sitting on a shelf collecting dust. The amp worked perfectly when it was removed from the car. However looking to get back into installing some gear in my current car and was testing out amps and this one seems to magically be dead now. Was hoping to get some ideas on where to start troubleshooting.

upon hooking up to 12v source the amp has a short spike of current draw (i'm guessing this is internal caps charging up)
once the remote wire is connected to 12v the amp has a current draw of .02 amps...

Its like the amp forgot how to turn on or something

any input would be great
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Old 2nd May 2014, 10:53 PM   #2
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It's relatively common for amps to fail while in storage. If the protect LED is remaining on, U21 may be defective. You'd need to post the DC voltage on all legs of the IC. If you need more information to do that, let us know.
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Old 2nd May 2014, 11:06 PM   #3
jlind54 is offline jlind54  United States
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How do I know which pin is pin one on the U21 chip? Also, protect light does not come on and the power light on the top does not come on.
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Old 2nd May 2014, 11:13 PM   #4
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I've attached the layout but if the protect LED never comes on, it's probably not U21. Is the remote terminal loos where it goes into the amp?
Attached Images
File Type: gif pinconfig8pinopamp.gif (6.5 KB, 53 views)
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Old 3rd May 2014, 12:06 AM   #5
jlind54 is offline jlind54  United States
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Join Date: Nov 2012
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that was the first thing I checked, when I first got this amp it had a bad connection there so I resoldered it.

Pin1 :0v
Pin2 :0v
Pin3 :0v
Pin4 :0v
Pin5 :5.04v
Pin6 :9.80v
Pin7 :0v
Pin8 :0v

following the trace from the remote on it appears to end up at pin6. with the remote not connected there is 0v on all pins
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Old 3rd May 2014, 12:11 AM   #6
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Pick any of the power supply FETs (the ones near the remote terminal). What is the DC voltage on all 3 legs. Don't let your probes slip while doing this. I'd suggest inserting a 10 amp fuse In the B+ line before measuring.
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Old 3rd May 2014, 12:37 AM   #7
jlind54 is offline jlind54  United States
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0, 12.6 (same as battery voltage), 0
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Old 3rd May 2014, 12:39 AM   #8
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DC voltage on LM339 and SG3526?

lm339
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:


3526
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:
Pin 17:
Pin 18:
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Old 3rd May 2014, 12:44 AM   #9
jlind54 is offline jlind54  United States
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Join Date: Nov 2012
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Hey just wanted to tell you thanks for you knowledge and time before we go much further!
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Old 3rd May 2014, 12:50 AM   #10
jlind54 is offline jlind54  United States
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Join Date: Nov 2012
Location: Kansas
does the lm339 refer to the chip in U13 and the 3526 U14?
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