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From: "Adrian Nicol fenland787@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
To: "hp agilent equipment" <hp_agilent_equipment@...>
Sent: Wednesday, February 24, 2016 9:52:43 AM
Subject: Re: [hp_agilent_equipment] Spring loaded Old Style Front Panel Buttons

Hi Barry, short answer is yes, that is the reason and the fix is dead easy
and really effective, if my experience is anything to go by.
There is a parallel thread running where I and others have posted their
solutions - I just did a 3456A and 3455A as well as an 8566A and other gear
- but this is what I did:

Remove the switch PCB from the panel, flood spray the switches with IPA
(Isoprop alcohol) and operate each a few times, within just three or four
operations they free up like magic going from clunky
'feels-like-something-is-about-to-bust' to almost silky smooth! Then blow it
off with an air-gun and give it another dose for luck.
Works for me anyway!


On Wednesday, February 24, 2016 3:09 PM, "Chuck Harris cfharris@...
[hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:


? Hi Martin,

The easiest thing is to find the spring that fell out. It
is sticky with grease, so it will often stick to something.
If it is in the instrument, you must find and remove it, as
it can cause short circuits.

If you can't find the spring, you will have to get one from
other instrument's keyboard. There are plenty of scrap hp
front panels with keyboards on ebay.

You can make a new spring, but it is very critical in its size,
finish, and temper. I have heard that some have had success
making springs out of steel "feeler gages" Tin snips will
cut them, but make sure that you snips don't have a serrated
blade. I seem to recall that they are 0.0015" thick. The
size is somewhere in the archives. Shim stock will not work!
It is too soft.

On occasion, while I was waiting to find the correct spring, I have
made a coil spring and placed it so that it pressed on the keytop,
and the key mechanism. It doesn't click, but otherwise suffices.

-Chuck Harris

Martin.Hepperle@... [hp_agilent_equipment] wrote:

I got a 9915 computer which uses the same leaf-spring loaded front panel
buttons
as many older HP instruments (/e.g. the 3456A DVMs).


Three of the springs have fallen out and I need to fix that.


Are there any sources for these parts or ways to obtain similar springs or
even
complete switches?


Any well known repair procedures that I should know?


I could possibly obtain some flat sheet spring steel and grind a spring to
shape
using Dremel tools etc. but that sounds like a difficult and very time
consuming
task. Also the length of these springs must probably quite accurate.


Otherwise I would have to try something with external helical springs, glue
and
other ugly constructions...


Thanks, Martin

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