[Test-Equipment] Question regarding HP-8640B

[Peter Wittenberg SR]

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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