[R-390] R-390 - Very Basic Question Re: Front Panel removal

[Jim Whartenby]

Might try a hair dryer to heat up the cable to make it a bit more flexible.  It might take a while but it should work.Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Tuesday, November 19, 2024 at 12:41:04 PM CST, Barry <n4buq at knology.net> wrote:   

 Oh, okay.  That does make a difference.  That cable is quite stiff and I can see how that would be a big problem.  Good luck with it!

Barry - N4BUQ

> With the radio resting bottom up, after removing the subset of knobs you
> mentioned, ideally if I could flip back the front panel and connected harnesses
> then access would to the zero clutch would be fairly easy.  But on my radio
> many of the wires in the harness are very brittle, cracked insulation.  I've
> had to place heat shrink tubing over some where bare wire was visible, so I'm
> afraid that any flex on the two main harnesses would likely cause further wire
> fraying.  I will see how laying on its  side and tilting the front panel will
> work.
> 
> -----Original Message-----
> From: Barry <n4buq at knology.net>
> Sent: Tuesday, November 19, 2024 12:12 PM
> To: k1jos <k1jos at att.net>
> Cc: R-390 Mailing List <r-390 at mailman.qth.net>
> Subject: Re: [R-390] R-390 - Very Basic Question Re: Front Panel removal
> 
> As long as you don't lean the radio towards the top or bottom, the center shelf
> should be sufficient to support the sides.  I'd think it would be much, much
> easier to work on the clutch with the front panel removed.  There's just a
> subset of knobs that have to be removed to do that (MEGACYCLE CHANGE, KC
> CHANGE, BANDWIDTH, BFO PITCH, and ANT TRIM).  BANDWIDTH and BFO PITCH may be
> best to remove using the clamps on the shafts coming out of the IF deck.
> 
> Good luck with it,
> Barry - N4BUQ
> 
>> I need to repair the zero adjust clutch plates, they are stuck
>> together.  I have tried Kroil and WD-40 and physical torsion by hand
>> but no joy.  I need to work with the radio upside down and front panel
>> off to remove the clutch gear and tension plates.  I know I can do
>> this by removing all of the front panel knobs, meters, etc but I could
>> also manage by unbolting the front panel and having the radio resting
>> on it side.  As I start doing this I realized without the front panel,
>> the side panels have little physical support and may bend under the
>> weight of the radio.  Does anyone have any advice how to best manage
>> this repair?  At my age (76) I can just manage moving the radio around
>> on the workbench, but I am very concerned not to get into a position that causes
>> damage to the panels and RF tracking systems.
>> 
>> 
>> 
>> Thanks in advance.
>> 
>> 
>> 
>> Jerry NY2KW
>> 
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