[R-1051] 1 @ 10 KC synthesizer module

[Steve Hobensack]

I have been working on a problem in my R-1051b for several days. I am 
getting an intermittent condition after about an hour warm-up where the 
incoming signal gets weak, and is masked over by a lot of noise ( like ocean 
waves). I did a lot of module substitution in the 6-pack. I have narrowed 
the problem down to the one/ten KC module at the far rear of the 6-pack. I 
removed the module cover. Tapping and gentle pushing with a small wooden 
dowell rod has further narrowed the problem down to Z3 and/or Fl1 on the top 
board. The underside of the board looks good under careful scrutinizing with 
a magnifying glass. Looks like I will have to unsolder  and open Z3 and Fl1. 
  Z3 is a sealed unit containing one transistor and a few resistors and 
capacitors. FL1 is a sealed unit and appears to be a crystal lattice filter. 
  Has anyone ever attempted this type of repair? Are Z3 and FL1 repairable?

Any tips will be appreciated.

Steve....N8YE