brit01 wrote:......Left output: 0.35 mV
Right output: 0 mV
There is definitely something up with the left channel. I was advised to first check out the input differential transistors. There should be a pair and this is normally the where the first problems are spotted when bias is out or can't be adjusted.
Richard: Do you know what this is about and where I can see these on the schematics and in the amp ?
Here's a snippet of the schematic after the input buffer. THe gain stage of the push-pull CAN be out-balanced by a failed component there, but I'd expect the offset to be MUCH greater then; VOLTS; enough to trip the offset protection. Wouldn't hurt to check them though.
On the left channel (top) the positive swing is Q103, the negative Q109
brit01 wrote:......Also: The only white rectangular resistors on the right are: R254/R258 and R252/R256
Would it be one of these pairs to measure the right bias?
Those resistor number pairs are actually just above and below the test point, they should be 2 watt devices, the ones you're looking for should be the largest. In other amps I've worked on these are big, rectangular, encased in a block of ceramic. They're usaually 5 watt though, a 3 watter COULD be just a fat looking cylindrical resistor I guess.
Anyway, the resistors you're looking for are the fattest ones (R248 and R250). One leg of both of these is a short to R 236 and R238. Once you find those, the test point is across the OTHER legs.