MARANTZ TUNER/AMPLIFIER SYSTEM SR 6000

[BEHIELS JEAN-PIERRE]

Heatkit members;

Does someone has any experience with the repair of a old MARANTZ amplifier/tuner model SR6000 ?
I have some problem to repair the PCB board PN00 and P700 these boards contents 3 pieces of power amplifiers.
Like  1 piece STK3082 and 2 pieces STK0080 II
I replace all the possible components around those integrated modules,and problem there I the output power 
of the module STK3082 always sounds distorted.
Normaly you can setup the linearity by means of potmeters RN09 and RN10 on the schematic,this helps but don't bring the big solution on it ??
Ones I mount the 3 integrated circuits and I will setup the whole thing by menas of RN09 and RN10 two of the integrated circuits
always blow up (1 power module STK0080 and one STK3082 blows )?
In according the service manual I have to setup RN09 and RN10 till I have on the output connection of the audio boxes at least as small
as possible voltage around (<0.30 mV)
But this seems not happen.
Like you can see there a not a lot of many components around those STK circuits,whats is going on or what I see over the head ?
I try to make any test with only the STK3082 module on it and apply any audio,but I think the whole think as to be work together
in conjunction with one of the two power modules STK0080.
I thought I apply audio on connections 1 en 15 of the STK3082 and I will ear lovely audio out on pins 6 and 10 but I ear only
nice music at very low audio levels,ones I tune up the volume dial on the front panel everything sound distorted ???
What the reason for this could be !!  
I hope someone have any experience on STK integrated circuits.
I buy this lovely RETRO MARANTZ piece for only 5 dollar and I will retune the whole system,it is in good shape en condition.
I have a lot of MARANTZ equipment hier for more than 25 years and I was always lucky with them,give my a lot of statisfaction.
This old piece has been buyed for use as background music system in the radioroom.   

Inclosed the whole system schematics.


Greetings es 73'sJean 

Behiels Jean-Pierre.
Molenstraat 95.
B-2070 ZWIJNDRECHT
BELGIUM(EUROPE)
Tel/Fax : 03/722/15/00
E-mail : on4aef at versateladsl.be
Skype : ON4AEF

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