[R-390] RF deck removal

[Phil]

Craig, I've done more round trips removing and reinstalling an RF deck
than I care to admit to and I've never had to remove the IF deck.  I do have
to remove some connectors from the IF deck.  Why
do you list this?.... Has your memory gone the same way my 69 year old
memory has gone ?

73, Phil  W5BVB


On 10/10/2014 5:47 PM, Craig Heaton wrote:
> Sort of from memory:
>
> Find two short blocks of wood to raise said radio a tad.
> Remove top & bottom covers.
> Remove Oldham spring.
> Reaching in with a very long Philips screwdriver, remove green head screw
> which holds clamp/wire harness just above the local gain pot. Use hole in
> bottom left front of RX.
> Remove IF deck.
> Place wood blocks/etc under said receiver; set receiver frequency to 7 +000
> Drop front panel, if you got the correct clamp in above step there will be
> more than enough slack to drop front panel.
> Next is the crystal deck; remove coax connectors from antenna relay which
> are behind the crystal deck. You will have to rotate one of the gears to get
> to one of three green head screw on the front of the crystal deck. Loosen
> clamp holding said crystal deck shaft. Slide deck back towards antenna relay
> and remove.
>
> At this point, attack the RF deck with vengeance. Remove all green head
> screws, spacer from Oldham coupler will fall free from the PTO. It should
> remain on workbench.
>
> YMMV
>
> Craig,
>
> -----Original Message-----
> From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Alan Victor
> Sent: Friday, October 10, 2014 2:43 PM
> To: r-390 at mailman.qth.net
> Subject: [R-390] RF deck removal
>
> In the Y2K manual and the Army TM the instructions for the removal of the RF
> sub chassis have you remove the Oldham coupler backlash spring first. Then
> remove the front panel following the procedure in a previous paragraph. In
> that previous paragraph the KC knob is to be rotated fully CCW to -963.
> QUESTION: Why not do this first and then remove the backlash spring. Does it
> matter? Not knowing any better,  it would seem I run some risk turning the
> KC knob with the backlash spring removed.
> Is the pressure present on the pressed couplings sufficient that this is
> just not an issue? Or if I rotate to -963, I cannot get to the backlash
> spring readily?
>
> One last item. I notice in the TM a CAUTION that during the removal of the
> RF sub chassis, the Oldham coupler on the VFO shaft will come apart and the
> center disk will fall to the bench. I can see my luck, it will fall on the
> floor never to be found! This item is not in the Y2K manual, perhaps because
> it can be handled in a better way? Or there is typically so much grime and
> grease that it just does not fall off.
>
> Comments?
>
> Thanks again in advance!
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