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Member Since 24 Dec 2007
Offline Last Active Jun 28 2013 03:07 PM

Posts I've Made

In Topic: MA3600VZ odd distortion on one channel

14 June 2013 - 10:12 PM

I have repaired hundreds of macrotech. Never seen waveforms like those. Possibly the 100hz.
Did you find the fault?

In Topic: a5002 high side bias on channel 1

14 June 2013 - 10:03 PM

   It turned out to be an intermittent high side bias 500 ohm pot that my new apprentice missed.  It would sometimes test good when a little pressure is applied to it from the test leads. D517 and 516 were also defective.
Thanks for your reply.

In Topic: a5002 high side bias on channel 1

11 June 2013 - 04:32 PM

i will try washing the board. What do you normally use? All the components on the bias string tested good. I still replaced the bias transistors. Same problem. Are you suggesting it might be more serious like drivers and outputs?