JVC VR-5505 DC Offset Fix?

[ADKBob]

I have a JVC VR-5505 receiver with DC offsets of ~120mV left and ~220mV right. The schematic in the service manual does not coincide exactly with the parts on the circuit board. For the left channel, D701 and D703 are in series with a 68 ohms instead of 82 ohms in the schematic. In other designs, the resistor in series with the diodes is adjustable to set DC Offset. How do I adjust the DC Offset down? Is there another schematic I should be looking for? X707, X708, X709 - X712 are HITACHI kit PT-038. Does that mean they should be replaced as a set?

 

[ryuuoh]

I believe you need to replace the input differential transistor pairs with closely matched transistors to bring the offset down.

 

[ADKBob]

I looked at the schematic and I'm not sure which transistors you are referring to.