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Old 4th February 2013, 11:36 PM   #1
chipper is offline chipper  United States
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Default Rockford fosgate punch 55.2 won't turn on

I have this punch 55.2 amp I'm working on I replaced the power supply fets and driver transistors. Amp still won't come on. Also removed all shorted outputs. No lights nothing, can anyone help me with this? Thanks

Board number is pc-1882-a
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Old 5th February 2013, 02:11 AM   #2
chipper is offline chipper  United States
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Anyone ? I just freshly replaced gate resistors, power supply mosfets (irf3205) and driver transistors. It's not coming on I'm not sure what to check next, any ideas??
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Old 5th February 2013, 02:45 AM   #3
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Post the DC voltage on the LM339.

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:
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Old 5th February 2013, 04:52 AM   #4
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Is the remote voltage making it through the amp?
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Old 5th February 2013, 08:45 PM   #5
chipper is offline chipper  United States
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Quote:
Originally Posted by seankane View Post
Is the remote voltage making it through the amp?
I suppose, TL494 & LM339 get like warm. I don't get what's going on with this amp never experienced this problem usually I replace short semis and a few resistors and smd transistors and its working again but this one is something else...
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Old 5th February 2013, 08:49 PM   #6
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
Post the DC voltage on the LM339.

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:
Any possible way to check this w/o a meter? I left mine at my buddy's I have to go pick up it but for the mean time, I have a meter that measures continuity... TL494 & LM339 both get luke warm when I have power applied to the amp. No fets get warm or hot all stay cold.
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Old 5th February 2013, 10:48 PM   #7
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I'll need the voltages on that IC to help.
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