Schematics needed for a Marantz 1020

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marantz 1060

hi all, i know this is an old thread but maybe someone can help...today i got a marantz 1060...unfortunately theres an issue, when i select the main or remote speaker switch the right channels makes a loud hum...i quickly turned off the amp fearing it sent DC to the speaker...can anyone shed any light why its doing this? is it faulty output transistors? thankyou!!! Andy
 
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