[R-390] Fix for ZERO ADJ.

[Tom M.]

 One more thing Ken.  The zero adjust knob has a little tab on the backside of it that works as a stop against a like tab on the shaft.  If your knob is seated down too far on the shaft or was not tightened on the shaft at the right starting point, then the stop on the knob/shaft will prevent the clutch from being pressed in sufficiently to cause the plates to separate.  Take the knob off and examine if it is hitting the knob stop prematurely.  If it hits the stop prematurely, back it off counterclockwise a bit and reset the set screw and try again.
Tom

    On Friday, March 1, 2019, 1:12:11 PM CST, K PERALES <kenperales at comcast.net> wrote:  
 
 Has there been anything written about repair of the ZERO ADJ., when it does not seem to release the clutch to zero the kHZ dial setting.  I am off from 1 to 3 kHZ over the full range of 0 to 32 MHz which is probably more than just the zero adjust but I cannot do even the basic adjustment on any calibration point from top to bottom.  Looking down inside the front panel, I can see shaft turning and as it gets close to the stop point turning clockwise, I can see what I assume is the clutch plate just barely moving.  I have looked through many of the instruction manuals I have but seen nothing about repairing the ZERO ADJ.  I am guessing that someone out there has repaired this at some point.


Ken Perales

______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html