Tandberg 9000X only recording one side.

[TonyDuell]

This is going to go a little off-topic, but I hope nobody will object too strongly.

I was taught the old-fashioned method of faultfinding, which basically goes as follows :

The unit doesn't work.

So : what should it be doing, and what is it actually doing?

You can use the circuit diagrams, etc for the first part. The idea is to deduce what signals/voltages you expect at various points

You use measurements to determine the second part. You measure just what voltages, signals, etc you get at those points

You then work out what can cause the values you measure.

Then, and only then, do you start changing components.

The difficult bit is really working out what is worth measuring, and what it will tell you. As here. The voltage on the other input of the op-amp could tell you quite a lot.

[NorfolkDaveUK]

Yeah that`s basically my approach . I generally re-cap a machine after fault finding , but I was waiting on a part for this one from San Francisco , so while I was waiting I got that done . Sounds great with some nice Panasonic caps in there now . I still need to calibrate it , still dont have a test tape though . I really must invest in one . Trouble is every time I can afford one , I buy another machine to repair instead ...haha