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Old 14th December 2006, 04:05 AM   #1
nu2this is offline nu2this  United States
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Default punch 401s problem

the left channel has no output. there is no sign of damage and i checked the the big resistors beside the mosfets and they are all good. not real good with amp repairs yet. just started tring but it passes the time. i don't know much but if somebody could point me in the right direction i will read as much as it takes.
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Old 14th December 2006, 10:24 AM   #2
Hayden is offline Hayden  Australia
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Did it just die?
Was it working before?
even though components look fine on the outside they can be dead inside, trace the channel back to the output transistors and put your meter on diode and measure them in all combinations if their shorted they will show close to 000 thatís if its badly damaged or have a low impedance resister inline. the reason for the channel being dead could be anything, do an elimination check make sure its in the amp, swap cables and change sources fiddle with settings stuff like that, it could even be dry joints.
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Old 14th December 2006, 11:04 AM   #3
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Default Re: punch 401s problem

Quote:
Originally posted by nu2this
i don't know much but if somebody could point me in the right direction i will read as much as it takes.

In that case:
http://www.bcae1.com

Loads of reading!
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Old 14th December 2006, 12:31 PM   #4
nu2this is offline nu2this  United States
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thanks for the replies and the link. the amp just quit. i think i will do the reading first. i like to understand things instead of jumping in. thanks again.
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Old 14th December 2006, 07:49 PM   #5
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Rockfords rarely fail where one channel just quits (completely dead, no static/distortion, no DC).

Did you try switching the RCA inputs (left/right) to confirm that it's not a signal input problem?

Did you try try swapping the speakers (left/right)?

Is there any DC voltage across the speaker terminals (black lead on negative speaker terminal, red lead on positive speaker terminal)?
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