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
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
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