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

[David Wise]

Where does the manual refer to Y201?
I didn't see it on my skim-through.

I have some spare slug racks for the R-390A
(courtesy of a list member who I've forgotten),
but I doubt they'll fit in an R-390.  If you
absolutely can't find a spare, you can have one
of mine and cut the lifter off it.  I'm thinking
Dremel and JB Weld.

An R-390A with your mechanical failure would be
inoperative but unharmed, because the slugs were
suspended from springy wires.  If I remember correctly,
however, they were rigid in the R-390.  You're right,
if it's been cranked from one end to the other, it
might have broken a couple of slugs or coil forms.
It's not hard to check.  I hope they're okay.

Or am I screwed up and this is the spot where the
coils themselves are lifted, not just the slugs?
I don't know if even a bearing from the R-390A will fit,
in that case.

HTH,
Dave Wise

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of Jim Green
> Sent: Monday, September 24, 2007 3:58 PM
> To: r-390 at mailman.qth.net
> Subject: [R-390] I may have located one BIG problem with my R-390 (not
> A)
> 
> 
> 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  
> 
> 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