[R-390] Variable-Frequency Oscillator End-Point Adjustment
Craig C. Heaton
wd8kdg at worldnet.att.net
Wed Apr 27 12:59:47 EDT 2005
Good Morning to All,
The other day while performing an end-point adjustment I realized there is
a better way. For those who would like to add a new tool to their
collection; add a Snap-On SSM5A. It is nothing more than a screw starter.
Used one years ago (about 30 years) for those hard to reach places on
motorcycles.
No need to remove the VFO subchassis just to remove the
end-point-adjustment cover nut, reinstall VFO; then, repeat the same process
all over again when you are done with the end-point adjustment!
You still have to remove the front panel. Rotate the riveted locking plate
by hand until the holes line up through the front of the receiver and allow
access to the cover nut. I then used a screw driver long enough to just
loosen the VFO cover nut. Leave the cover nut partially threaded into the
VFO. The SSM5A is about 5 1/4 inches long. Long enough to reach the cover
nut. If you have a screw starter or purchase one the next sentence will make
sense. Cock the screw starter and place it through the riveted locking plate
hole and lower it until it reaches the cover nut. Line the screw starter up
with the notch in the cover nut and push. Rotate the cover nut until loose.
Righty tightie, lefty loosie. The screw starter can now be raised with the
cover nut attached. The cover nut will NOT pass through the hole in the
riveted locking plate! You will have to grab on to the cover nut with your
fingers.
Access to the adjusting screw is now possible. Reverse the process when the
end-point adjustment is complete. This should give R-390A owners more time
to play Radio.
And of course you have my standard tail light guaranty this will work on
your R-390A, it has been tested on a 56 Motorola.
later............craig,
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