[Drake] TR-7 Problem/ Contact Cleaning

Sat, 29 Dec 2001 15:50:13 -0800

"Erasers"?  ... for contact cleaning ... OK, but .......
That is .... a soft, rubber, non-abrasive eraser.
    Avoid those "ink erasers", which will take the
    plating off of contacts.
    Soft cloths and non-abrasive paper are fine.
    But, here again, some paper, like Kleenex,
    have abrasives, that could be much for a
    thin plating.  I would presume that those
    eye-glasses wipes, impregnated with a
    cleaning solution, would be good?  And there,
    is good old, expensive, De-Oxit, which I
    understand causes minimal damage at large.

(Somehow when I think of cleaning contacts,
I think of what I consider the horror of horrors,
namely those pushbutton switches on the
Zenith TransOceanics.  Never met one that
didn't seriously need cleaning, nor one that
was fully clean.   Always scratchy.)

There must be a lot of otherwise good equipment
that we stopped using, only from our impatience
with poor contacts in the switches and controls.
At least with the older, particularly tube type,
larger gear, we can get at most of the contacts.
With this tiny stuff made now, can't get at the
contacts: and if you try dousing with some
solvent, who knows what will dissolve.

THERE! is a great subject for a posting ... "How
to Clean the Contacts on your 2" by 2" handheld
3 band transceiver with full receiver coverage,
and not have it disappear completely".

Gee,  my TR-7 seems big ... NOW.

Gene (the bigger, the better) Rippen,  WB6SZS

> (1) When cleaning contacts ... clean them with pencil eraser.
> (2) Another move: Exercise the counter switch on the back panel.
> ----- Original Message -----
> From: Fredric J. Einstein <[email protected]>
> To: <[email protected]>
> Sent: Saturday, December 29, 2001 09:57
> Subject: RE: [Drake] TR-7 Problem
>
>
> > Before doing anything drastic, I'd open it up, take off the shield, and
> > reseat all of the boards including the digital board.  See if it's
> > simply a contact problem.
> >
> > -----Original Message-----
> > From: [email protected] [mailto:[email protected]]
> > On Behalf Of David M. Nance
> > Sent: Saturday, December 29, 2001 9:43 AM
> > To: [email protected]
> > Subject: [Drake] TR-7 Problem
> >
> > I've been enjoying my "new" TR-7 for the last three months.  However,
> > this morning while having a QSO on 75 the digital display went blank and
> > now it won't transmit or receive.  My suspicion is the power supply
> > board in the transceiver, since the FA-7 fan still works and the meter
> > and analog dial lights are still working.
> >
> > If this helps, the TR-7 did the same thing a few days ago, but only for
> > a split second.  I suspected then I was going to have problems.
> >
> > Since I have had little experience with the TR-7, I thought some of you
> > on the list might have some ideas as to where I should start looking.
> > All of my service experience has previously been on tube rigs.
> >
> > Thanks,
> >
> > David Nance - W4SSE
> > [email protected]
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