[R-390] Dead 6MHz and 10MHz

[Roy Morgan]

Quoting Fraser Bonnett <FraserBonnett at adelphia.net>:

> >Upon further investigation I have no Calibration signals on 6, 10, 23
> 
> OK, so these bands share the same crystal in the Crystal OSC module.  Is it
> possible to get the cover off the crystal oven, without going through the
> steps outlined in the Tech manual involving removing the from panel, playing
> w/ the gears etc?

Fraser,

Yes. The cover has three screws: one at the front visible from the top, and two
at the rear, not so easy to see. These two at the rear are accessible from the
back of the radio if you have a LONG phillips screw driver. They are able to
fall down into the radio and be hard to retreive but with care you can capture
them as they are loosened.

Note: the cover of the crystal oven has a heater element in it (along with some
fiberglass insulation). The heater is fed power by two pins that engage
correstponding contacts in the base of the unit. SO...Pull straight up once the
cover is loose. Get all three screws out before you remove the cover.  All this
is easy to see and manage once you've done it once.

It's ok to run the radio with the crytal oven cover off. You MAY find that just
removing and replacing the crystal will solve the problem. You should do this
for all the crystals to make sure they all have nice connections.  More likely,
the crystal is bad, but let's hope it's just a bad connection.

Good luck.

Roy
 

Roy Morgan, K1LKY
7130 Panorama Drive
Derwood MD 20855