[R-390] Zero Adjust - not quite

[k1jos at att.net]

My R-390 electronically now seems to be workings quite well.  The dial
however is off 1.5kc and I cannot screw down the Zero adjust quite enough to
make the VFO adjustment.  Attached is a picture.  I can see the brass gear
move and the steel plate behind it move a fraction of an inch and the dial
mechanism is very tight to finger movement but not enough and the VFO
changes frequency despite the Zero adjust fully screwed CW.  Also, the
spring that I assume should provide some resistance when not screwed down
seems to have lost its tension completely.  

 

I compared to the Zero adjust from a R-390A, also shown in picture.  Can I
swap the R-390A into the R-390?

 

Jerry  

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