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-   -   Rockford Fosgate T20001BD wont power up (http://www.diyaudio.com/forums/car-audio/228423-rockford-fosgate-t20001bd-wont-power-up.html)

amp it up 22nd January 2013 08:28 PM

Rockford Fosgate T20001BD wont power up
 
HI I have a Rockford Fosgate T20001BD that wont power up at all it doesn't draw any current at all. I don't have a scope but I do have a DMM! Where should I start? THANKS!!

Perry Babin 22nd January 2013 10:06 PM

Start by posting the DC voltage on all of the terminals of the SG3526. Copy and paste the following into your reply.


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:

amp it up 23rd January 2013 12:02 AM

Rockford fosgate T20001BD
 
Heay Perry I knew you would be the first to answer Thanks!!

Pin 1: .42
Pin 2: .137
Pin 3: .045
Pin 4: .006
Pin 5: .700
Pin 6: .000
Pin 7: .000
Pin 8: .006
Pin 9: 3.58
Pin 10: 1.921
Pin 11: .001
Pin 12: .667
Pin 13: .001
Pin 14: 10.36
Pin 15: .000
Pin 16: .001
Pin 17: 13.34
Pin 18: 4.98

Perry Babin 23rd January 2013 12:52 AM

It appears that you don't have remote voltage. If you have 12v on the remote terminal, post the DC voltage on all pins of U1.

amp it up 23rd January 2013 01:09 AM

Pin 1: .005
Pin 2: .005
Pin 3: 13.94
Pin 4: 4.59
Pin 5: .258
Pin 6: .256
Pin 7: 8.67
Pin 8: .196
Pin 9: .138
Pin 10: .000
Pin 11: .056
Pin 12: .000
Pin 13: -.287
Pin 14: .001

Perry Babin 23rd January 2013 01:17 AM

Pins 5 and 6 should be connected to pin 18 of the 3526. See if you can find the break in the circuit.

amp it up 23rd January 2013 01:45 AM

Perry it looks like I have a 1R0 resistor that's broke. I don't have no 1R0's what can I put in its place to test The amp?

Perry Babin 23rd January 2013 01:53 AM

If you don't have a 1 ohm surface mount, you can use a leaded resistor.

Check C8 and C9 before replacing it. One may be shorted.

amp it up 23rd January 2013 03:18 AM

OK I went and got a 1 ohm resistor and installed it and the amp powered up and played fine but r35 and r36 gets real hot You cant touch them and the amp was only on 2 or 3 min. what should I check now? THANKS Perry for all your help!!

Perry Babin 23rd January 2013 09:45 AM

That's normal. Those resistors are connected across the rails. They ensure that the rail caps drain quickly after the amp is switched off (some of the old BD amps would retain a dangerous charge for weeks).


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