denom pma250 amp faulty,but no faulty parts found please help - diyAudio
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Old 7th December 2008, 12:25 PM   #1
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Location: suffolk
Smile denom pma250 amp faulty,but no faulty parts found please help

Hi everyone working on a faulty denon pma 250 mk 3

Speaker relay not swiching due to dc rails on output,disconnected emitter outputs on left channel output stage ,speaker relay works,

So far i have changed right channel output for left still same ,

taken out pre divers and tested with dmm (good)

removed drivers and tested(good)

Checked emitter resistors(good)

checked all resistors ,and signal diodes all same as right channel

Checked bias transistor and the pot same as right channel

At a loss anyone any ideas

Thankyou in advance
if you strip it for parts keep them for years as soon as you get rid you will want them .....................
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Old 7th December 2008, 03:58 PM   #2
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dc-coupled pre-stage/end-stage ?
pre-amp giving dc as input to poweramp?
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