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Re: [TenTec] Sticking meter on Argosy 525

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Sticking meter on Argosy 525
From: Stuart Rohre <rohre@arlut.utexas.edu>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 28 Mar 2012 17:48:04 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
WELCOME to ham radio!

Sticking meters usually have picked up a metal chip or dirt in between 
the moving pivoted coil and needle and the magnet core that surrounds 
the moving parts.

It could also be dirt in the needle bearing pivot points.

Use a strong light, like a bright LED flashlight, or Halogen light to 
inspect the area between the moving coil/pointer and the core.

You may be able to blow out obvious dust and cobwebs with a camera 
squeeze brush/ rubber bulb device, with gently puffs.

Or you may be able to take a sheet of printer paper, very smooth type 
and cut a ribbon of that to pass into the space between the coil and 
magnet core.  But, first try to figure out what is binding the pointer.

You can puff gently with your breath to drive the pointer up scale off 
rest point, and see if it only hangs up as it passes one spot.

If you have a piece of metal or chip in the core of the magnet, you have 
to use the corner of a strip of printer paper to nudge it out.
Only use tweezers when you can get at it on the outer magnet area, NOT 
close to the fragile coil.

To do all this, you need to have the meter out of the rig, where you can 
rotate it around in your hands.  Use photo cloth thin gloves to keep 
sweat and skin cells off the interior of the meter.  Some meter cases 
are glued if plastic, others have screws and the plastic can be removed 
to gain access.

The ideal meters to work on are the old round ones in metal cans where 
you can get the whole meter guts out with removal of three screws around 
the can.

Hopefully, you can get into the meter and puff or blow out the foreign 
debris.  Don't try an air hose nozzle!  It will destroy the meter.

If it is a very well glued plastic cased meter, you may have to find a 
similar meter to replace it, or one from a junked rig of the same model.

Stuart Rohre
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