I have just repaired a Denon PMA-450 amplifier and would like to adjust the bias. Unfortunately, I am unable to locate either the service manual or even the circuit diagram.
There are the usual two variable resistors: one for each channel. However, for each channel there are two monitor points. The output transistors are 2SB1560 and 2SD2390 with four 0.1ohm 3W resistors which I think are in series?
Any help would be gratefully appreciated.
There are the usual two variable resistors: one for each channel. However, for each channel there are two monitor points. The output transistors are 2SB1560 and 2SD2390 with four 0.1ohm 3W resistors which I think are in series?
Any help would be gratefully appreciated.
Download Denon PMA-350SE service manual from hifiengine and see if the circuit matches PMA-450. Denon PMA-350 - Manual - Stereo Integrated Amplifier - HiFi Engine
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