[Test-Equipment] Question regarding HP-8640B

[Tod-MN]

If I wanted to 'thin' thickened lubrication I would apply a drop -- maybe
two drops of xylene [xylol]  to the bearing/shaft/gear and move it a bit.
Then I would let it sit. 

It has been a very long time since I opened up one of my 8640's so I forget
what they look like inside. I do remember that the gears were a plastic. I
suspect they will become increasing brittle with time so one should apply
force very carefully.

Tod, K0TO


-----Original Message-----
From: test-equipment-bounces at mailman.qth.net
[mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of Peter
Wittenberg SR
Sent: Friday, January 28, 2011 9:20 PM
To: n4buq at knology.net; Discussion of Electronic TestEquipment
Subject: Re: [Test-Equipment] Question regarding HP-8640B

Barry, if you ever get an answer to this question, please let me know what
is being suggested.  Many thanks...

-73- Peter K2LRC
www.k2lrc.com
God Bless America !

When they call the roll in the Senate, the Senators do not know whether to
answer "present" or "not guilty."  Theodore Roosevelt


-----Original Message-----
From: test-equipment-bounces at mailman.qth.net
[mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of Barry
Sent: Friday, January 28, 2011 10:19 PM
To: test-equipment at mailman.qth.net
Subject: [Test-Equipment] Question regarding HP-8640B

I recently purchased an HP-8640B and the bandswitch is very difficult to
rotate.  Knowing there are delicate nylon gears inside, I opened the bottom
and applied some extra twist at the Oldham coupler and managed to get the
shaft to turn a bit more freely.  Also, the Peak Deviation switch will only
move between the "5" and "10" positions.  Since these two mechanisms involve
the same gears, I wanted to mention that.

Are there cleaning and/or lubrication points that will help free the
machanisms?  After getting it to turn yesterday, after sitting overnight (in
a rather cool environment), the bandswitch is again difficult to move so I'm
figuring it is thickened lubrication somewhere.

Thanks for any help,

Barry - N4BUQ

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