[R-390] I may have located one BIG problem with my R-390 (not A)

[Jim Green]

Thanks to all who help me locate the non existent Y201 crystal in my  
R-390 (not A). For those of you not up to date on this there is no  
Y201 crystal in the R-390 (not A) receiver. There is however an error  
in my TM 11-5820-357-20 document. This is clearly intended to be for  
the R-390 (not A), but it still refers to a part that is not in the  
R-390 (not A) but is in the R-390A. Namely the Y201 crystal. Be  
forewarned. One would think a document written in 1961 would be fully  
vetted by now. Perhaps there are later revs. of this document.

Now on to the BIG problem. I guess I am going to get some practice  
working on the Geneva drive. The first IF can rack has a lifter arm  
on each end. One end of this arm has a roller that rides on a cam.  
When the mc setting is between 0mc and 8 mc. and as the kc knob is  
turned, this cam turns and gently lifts and lowers the first IF can  
rack. The problem is the roller on the end of the front lifter arm is  
missing. One end of the first IF can rack gently lifts as the kc knob  
is turned. However the front end of the first IF can rack is sagging  
much too low and doesn't move. I'm concerned this may have damaged  
either the slugs or the coil windings.

Wish me luck!

Jim