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Old 14th December 2012, 03:43 PM   #1
dhamia is offline dhamia  United Kingdom
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Default Rockford Punch 40 dsm repair

Hi guys I picked up an early punch 40 dsm
landmine style amp today, one channel plays
low with considerably less output than the other?

When adjusting the gain pot for the low channel there is only a slight gain when turned to fill power.

Another thing to note is the volume on the low channel adjusts when the gain pot on the working channel is adjusted?
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Old 14th December 2012, 03:46 PM   #2
dhamia is offline dhamia  United Kingdom
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I have checked the input RCA solder points and swapped out the gain pot with a spare I had and it still sounds the same?
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Old 14th December 2012, 03:51 PM   #3
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Do you see corrosion around the capacitors or op-amps on the preamp board behind the RCA jacks?
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Old 14th December 2012, 04:11 PM   #4
dhamia is offline dhamia  United Kingdom
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Click the image to open in full size.
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Old 14th December 2012, 04:17 PM   #5
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Old 14th December 2012, 07:48 PM   #6
dhamia is offline dhamia  United Kingdom
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Old 15th December 2012, 03:02 AM   #7
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Look on the audio driver board right behind the RCA jacks and see if any of the aluminum 10uf 16v caps are leaking. If you see corrosion or dark fluid on the board that is your problem.

Remove the board and remove all the caps, clean the board thouroughly and check for damage to any traces from the fluid in the caps.

If there is no trace damage, replace the caps and re-install the board. Test it for audio. LMK the result.
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Old 15th December 2012, 04:34 PM   #8
dhamia is offline dhamia  United Kingdom
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Thanks for the replies gents.

Here are more images, can you point out the caps please?Click the image to open in full size.
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Old 15th December 2012, 04:35 PM   #9
dhamia is offline dhamia  United Kingdom
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Also I noticed R233 looks a bit discoloured, could it be affecting the channel?Click the image to open in full size.
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Old 15th December 2012, 04:37 PM   #10
dhamia is offline dhamia  United Kingdom
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And finally, this section of the board looks like it may have leaky cap fluid as there is reidue on the board ?Click the image to open in full size.
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