DENON DRA455 Tuner Amplifier

[Brasto]

This Denon DRA-455 fails to turn-on when powered on.
The Red SBY-light and PanelDisplay donot illuminate.
Most likely it's SBY voltage generating circuit has developped some
problems as the kick-back diode across the MainPower Relay was found
fully shorted. Replacing the diode did not help.
The SBY voltage probably is generated and routed through the
frontpanel, but as usual I have no schematic to do any detailed
diagnosis.
Is there anybody around having more knowledge of this problem?
TY
Brasto

 

[Mark D. Zacharias]

This Denon DRA-455 fails to turn-on when powered on.
The Red SBY-light and PanelDisplay donot illuminate.
Most likely it's SBY voltage generating circuit has developped some
problems as the kick-back diode across the MainPower Relay was found
fully shorted. Replacing the diode did not help.
The SBY voltage probably is generated and routed through the
frontpanel, but as usual I have no schematic to do any detailed
diagnosis.
Is there anybody around having more knowledge of this problem?
TY
Brasto

No PDF from the server - how old is this model?

Mark Z.

 

[Brasto]

No PDF from the server - how old is this model?

Mark Z.

Hello Mark,
I managed to get a copy of my DRA-455 unfortunately the front page
says:
This service manual is composed of only pages whose contents are
different from those for the model DRA-385. For servicing refer to the
previously issued service manual of DRA-385RD (for UK and European
models) at the same time.

Well this probably saves the DENON company some paper but now I'll
have to try to find the DRA-385 as well......