Yamaha R-9 schemo

[TA7205]

Hi;

I just replaced outputs, drivers, .22 ohm resistors etc, in this R-9.

There's still a problem with that channel (DC through spkrs) and
protect relay won't fire until I disconnect the one of the collectors
of either the output transistors. Or drivers.

I have checked all the upper stage transistors, resistors and diodes
in the area that I can find. Something's still a miss.

Does anyone have a schematic of this amp ?

Any help appreciated,

Rick

 

[Jamie]

step back and look for leaky Electro caps on the input.


TA7205 wrote:

Hi;

I just replaced outputs, drivers, .22 ohm resistors etc, in this R-9.

There's still a problem with that channel (DC through spkrs) and
protect relay won't fire until I disconnect the one of the collectors
of either the output transistors. Or drivers.

I have checked all the upper stage transistors, resistors and diodes
in the area that I can find. Something's still a miss.

Does anyone have a schematic of this amp ?

Any help appreciated,

Rick