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Old 4th June 2009, 12:07 AM   #31
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Originally posted by AJ Bertelson
So where is a good spot to buy small quantities of these mosfets and the transistors?

Digikey has them but it is in bulk quantities of 100. I saw a pair of msofets that I need on ebay, but its ebay and the parts are from taiwan so I don't know what standard they are built to.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 4th June 2009, 06:16 PM   #32
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any places in the states?
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Old 18th November 2009, 12:10 PM   #33
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I finally go around to getting some replacement FETS and soldered them in.

No go and it didn't fix it. The green light went on but it would go into protect mode after about 5mins, same thing it did before I replaced the FETs.'

It currently will not go into protect mode and the lights no longer light up.
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Old 14th January 2011, 03:00 AM   #34
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Have just been reading your progress, but there is no conclusion. Were you able to repair the unit, and if so, what was the problem?

I currently have a HCA-1200II with similar problems.

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Old 11th February 2013, 12:28 PM   #35
Cobra2 is offline Cobra2  Norway
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I'm also in need of help... -bias-adjustment on one ch is "dead" -no reaction on pot, (have swapped pot too) measure minus 3-4V ! (and not mV).
There was a pcb-error on mine, shorting the mica-cap C111, took a while before I found the error(connected to Q109-collector in both ends). But the 10pF cap is not the problem here...
(Right ch is ok).
OpAmp(servo)swap did not make any change

Arne K
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