Marantz 74SR73 AV amplifier help and Service manual

[moltorayz]

Hi all forrumer

i need help here about my av amplifier model 74sr73
the problem is the amp play after certain time it no sound
the power is still there all the display is on but no sound
if somebody here have the service manual for this amp i want to check the protection relay circuit
i already replace some caps and i check seem 1 of the transistor is break and loose cz cold soldering. i already fix it but still no sound
one more problem seen is the base of stanby transformer have burn mark but it still function as it can turn the amp on maybe?
or if you guys here got any advice

thanks..

[moltorayz]

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