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Old 4th April 2011, 04:11 AM   #1
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Default Rockford Punch 800a2

Hello Perry while I am replacing the output fets on the bd15001 I thought I would pic your brain on the punch 800a2. It powers up fine does not draw excess current but has no output. Not so much as a sound or anything. Any thoughts on where to start?? The board number is PC-2038-C I dont think the output fets are faulty maybe check some op-amp voltages??
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Old 4th April 2011, 06:05 AM   #2
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Post the DC voltage on all of the pins of 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 4th April 2011, 06:20 AM   #3
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[QUOTE=Perry Babin;2526910]Post the DC voltage on all of the pins of the LM339.

IC#
Pin 1: 20.46 vdc
Pin 2: 5.07 vdc
Pin 3: 19.78 vdc
Pin 4: .164 vdc
Pin 5: 2.412 vdc
Pin 6: 4.92 vdc
Pin 7: 5.46 vdc
Pin 8: 4.35 vdc
Pin 9: 4.92 vdc
Pin 10: 4.92 vdc
Pin 11: 8.24 vdc
Pin 12: .001 vdc
Pin 13: 5.07 vdc
Pin 14: 5.07 vdc
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Old 4th April 2011, 06:37 AM   #4
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What's the voltage across R206 and R306?

Have you checked for audio on the output pins of the op-amps?
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Old 4th April 2011, 06:55 AM   #5
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Quote:
Originally Posted by Perry Babin View Post
What's the voltage across R206 and R306?

Have you checked for audio on the output pins of the op-amps?
I cannot locate R206 and R306?

I have not checked the op-amp pins for audio would that be pin 8 on all of them?
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Old 4th April 2011, 07:06 AM   #6
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See attached.

Look for signal on pins 1 and 7. Also confirm that they all have the 15 on the power supply pins.
Attached Images
File Type: jpg P9170008x.jpg (777.2 KB, 50 views)
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Old 4th April 2011, 07:06 AM   #7
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The amp draws like 1/2 amp at idle like its not fully turning on. An amp that size should draw a little current huh? Every once in awhile something clicks on the board then when I disconnect power it clicks again but very queitly and does not do it everytime. Strange.............
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Old 4th April 2011, 07:10 AM   #8
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R206 and R306 read 0.00 VDC
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Old 4th April 2011, 07:20 AM   #9
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Is the amp producing rail voltage?
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Old 4th April 2011, 07:25 AM   #10
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Quote:
Originally Posted by Perry Babin View Post
Is the amp producing rail voltage?

Yes -56 vdc on the gate and source of all IRF640 and +56 vdc on the gate and source of all the IRF9640
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