where can i find documentation of what the trimmers do?

i know an average amount about electronics but not that detailed and i am fine with soldering.

to measure the 22v from tr10, which two points should i put my multimeter?

thanks for your help, ethan.

The servicemanual will tell you all the alignment points and which instruments (signal generator, scope, voltmeter etc.) you need.
The rest are basics from the years of your electronics tech education.

But you cannot make those trimmers work. They will need replacing, as will the electrolytics.

Martin

The other thing to look for in the FM section are the 2 hidden trimmers (10K 50K) behind the Tuning indicator light, soldered through 2 layers of flex PCB. Although these are much more accessible than the same trimmer in the BM4400....

If that trimmer is shot (very likely), no FM works.

Extreme care is required to not split the flex PCB, and not damage it from heat either.

Recommended replacements are Piher PTC10 sealed cermet units.

Also, if you're planning on doing a full RF alignmenet, IIRC there are a couple of coils which were factory set, and the Service Manual specifically cautions to NOT adjust those coils at all.

Menahem

Guys, does anyone know what type is the TR10 transistor? I'm confused, cause in my manual I find three (3) types corresponding to the part number 8320161: BC261B, BC212B-L and BC251B.