You are right. It is necessary to get the lube to the shaft of the control.
If that is internal to the scope, you will need to open the scope up to where
you can get to the control. I have found that the cause is the grease on the
control shaft has dried up making it hard to turn.
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Good luck,
Tom
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----- Original Message -----
Sent: Monday, February 18, 2013 10:35
PM
Subject: Re: [TekScopes] T935A seized
pots help
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I have a T912 which had tight controls on the brightness and something else
(focus?). I managed to free them up a bit but they need more TLC. These pots
are located back inside the scope with plastic shafts running from the knobs
to the pots. I'm not sure if it's the pots are tight or the shafts in the
front panel bushings. These bushes release with a snap action by pulling the
shaft forward; it's detailed in the manual which warns considerable force may
be required. I'm worried about aging plastic breaking if I try to remove them.
I intend to try some lubricant as a first step. I hadn't considered deoxit,
have you found that effective on plastic? I was going to try isopropyl alcohol
first, then perhaps some oil. I've had success with silicon lubricant on
plastic if you can get it into the bearing. Are the pots you're dealing with
mounted on the front panel or remotely like mine. Please keep posting on your
progress. I have also considered the plastic might have swollen slightly, any
thoughts?
The T912 is a storage scope and a in a brief trial I couldn't
seem to get it to store, but I may not have been holding my mouth right. Have
to read the instructions again. Nice little scope.
Don Black.
On
19-Feb-13 8:11 AM, Tom Miller wrote:
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I would try to put a little thin oil down the shaft. Take the knobs off
and just apply a drop or two to the shaft and allow it to soak in for a
while. It may take a few applications to break it free.
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Tom
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----- Original Message -----
Sent: Monday, February 18, 2013 3:44
PM
Subject: [TekScopes] T935A seized
pots help
?
Hi,
First posting on this group, hope someone can help....
I have a T935A scope which has developed a problem and I'd like to
try and fix it as its a very useful portable scope.
Basically two of the front panel variable pots, the Y2 axis variable
and the X axis variable have seized solid. Y1 seems okay.
So before I strip the scope down, which looks to be quite a job to
get the relevant pcbs out, has anybody come across this before?
Is there much hope that I can fix the existing pots or do they need
to be replaced (any suggestions for good suppliers that will ship to the
UK?).
Many thanks,
Andrew
