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macrotech 2401


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#1 tecnolinha

tecnolinha
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Posted 05 May 2006 - 08:39 AM

Im having problems with 3 2401 amps. They all have the same problem. Without any signal on input, Signal leds are light. With a speaker connected on output,(without signal in!) turning up volume at channel 2 will move the speaker at very low freq. With signal on input hapens the same, but signal is passing. Anybody any idea where to look? Thanks in advanced.
Richard.

#2 KWhitehead

KWhitehead

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Posted 08 May 2006 - 10:19 AM

QUOTE(tecnolinha @ May 5 2006, 01:39 PM)
Im having problems with 3 2401 amps. They all have the same problem. Without any signal on input, Signal leds are light. With a speaker connected on output,(without signal in!) turning up volume at channel 2 will move the speaker at very low freq. With signal on input hapens the same, but signal is passing. Anybody any idea where to look? Thanks in advanced.
Richard.
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Richard,

Check the VCC caps and make sure one's not open causing excessive ripple. Also it may be the input CMR pot needing cleaned and adjusted. If the CMR pot is out of adjustment you should be able to tell by injecting a 1KHz square wave and with a scope connected to the output you should see a clean square wave. If the rise of the square wave is curved that pot may need cleaning and re-adjusted.

Thanks,

Kip Whitehead
Crown Technical Support