6 Apr
2001
6 Apr
'01
9:32 p.m.
From: Chuck McManis <cmcmanis(a)mcmanis.com>
Hello all, I've got a VT340 that is very fuzzy.
(blurry) I'd like to try
and refocus it but I don't have the maintenance manual for this
terminal.
Does anyone have any suggestions on where to start
(well I'm going to
start
by seeing if the yoke has slipped backward on the tube
neck, but other
than
that)
The focus pot is part of the flyback as is the HV adjust. I believe the
Yoke
is bonded on that tube so movement is unlikely.
Allison
7 Apr
7 Apr
1:01 a.m.
At 09:32 PM 4/6/01 -0400, Allison wrote:
The focus pot is part of the flyback as is the HV
adjust. I believe the
Yoke
is bonded on that tube so movement is unlikely.
Thanks Allison! I got the cover off and found the adjustment side of the
terminal (left side looking at it from the front) and the focus is a screw
that goes into what looks like an HV transformer. I've adjusted it to be
razor sharp, now what do I use to "lock it down" ? What is that stuff that
looks like nail polish called?
--Chuck
1:24 a.m.
Glyptal, if you can find it anymore.... but unless it is *really* loose,
I'd be tempted to just leave it be. The less messing with such stuff, the
better.
And of course, now you know where the tweak is, it's trivial to adjust
it again and then seal it. The problem with sealing is... if some thing
in the focus or HV chain is drifiting badly, and you gunk up the focus
pot, then, after repairs are effected, you have to un-gunk the control and
adjust it yet again. In my experience, sometimes these things don't take
too kindly to being messed with a lot.
Cheerz
John
1:57 p.m.
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4:13 p.m.
On Sat, 7 Apr 2001, John Lawson wrote:
Glyptal, if you can find it anymore.... but unless it is *really* loose,
I'd be tempted to just leave it be. The less messing with such stuff, the
better.
And of course, now you know where the tweak is, it's trivial to adjust
it again and then seal it. The problem with sealing is... if some thing
in the focus or HV chain is drifiting badly, and you gunk up the focus
pot, then, after repairs are effected, you have to un-gunk the control and
adjust it yet again. In my experience, sometimes these things don't take
too kindly to being messed with a lot.
Well, maybe. In a case like this, the better approach is to apply just
a dot of glyptal (or nail polish, for that matter) to one side of the
adjustment rather than 'paving it over'. That way any required future
adjustments need only to crack the dot rather than remove it altogether.
- don
Cheerz
John
8685
days inactive
8686
days old
5 comments
6 participants
participants (6)
-
ajp166＠bellatlantic.net -
ard＠p850ug1.demon.co.uk -
cmcmanis＠mcmanis.com -
donm＠cts.com -
jpl15＠panix.com -
mikeford＠socal.rr.com