[R-390] Zero adjust R-390

[Bruce MacLellan]

Pete and list members,
    I have had good luck removing paint using ordinary automobile brake fluid.   Just be patient and it will soften everything up.  

Bruce   

-----Original Message-----
>From: pete williams <jupete at bigpond.net.au>
>Sent: Mar 20, 2007 5:37 AM
>To: r-390 at mailman.qth.net
>Subject: [R-390] Zero adjust R-390
>
>
>List...
> I don't  suggest I have the  solution, but  consider the way it operates..... gotta 
>have the pictorial from the manual to fully  appreciate. However,when you screw in 
>the  knob , the  screwed shaft with knob, presses on a small bar that passes thru the 
>main shaft which in turn bears on a  washer that the presses on 3  pins of the spring 
>loaded clutch mechanism, . This  allows the PTO to be  temporarily disengaged f rom 
>the Veeder  Root indicator and then turning the  kHz knob sets the frequency to  zero 
>beat or to what ever point you're calibrating.
>It is my opinion that the small bar mentioned  above has broken or .fallen  thru thus 
>preventing  disengagement..
>I've just repaired one here  after fully  dissasembling but needed the manual.-- also 
>strong  fingers to  compress the   concave  springs on reassembly.
> For the R-390,  front panel  screw tensions  are irrelevant. ---my repair and 
>checking   done after the RF module  out of the  chassis and on the bench
>.
>FRONT PANEL PREPARATION.. Being a bit fussy, I like to clean up the  engraved 
>lettering on the panel after old paint removal  and prior to repainting.
>Some original paints  and the  white filler defy chemical  removal and prior to my 
>discovering heat, I laboriously scraped out  every letter  with  a suitable   scriber 
>(some of us are  crazier than others  down here in OZ). The paint is  hard but 
>recently I cut the time  down by soffening the painted  engravings  with a  fine tip 
>soldering iron  and followed  behind  with the  scriber.-- one in each hand. Then a 
>brush over  with  a  brass  bristle brush gets it  all off.
>I'd take  advise from those  who have  got  a  solvent for the recalcitrant finish.
>
>
>Pete D..Williams
>METUNG, 3904
>AUSTRALIA
>jupete at bigpond.net.au 
>
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