Re: 7854 sticky keyboard buttons repair


Daniel Koller
 

I'm not getting the "minutes later" part.   Maybe hours later, but I can't wait that long.  Exceedingly slow for me.   I get blank frames in all the photo albums.  Could it be some mystery setting in my browser? 
...ok, FINALLY.   As I was writing up this message, I went back to double check, and I can view the photos.   Something is deathly wrong with Yahoo's servers.  Maybe they are trying to emulate the dial-up days?  wow, how I don't miss those days.
  Dan

On Monday, November 13, 2017, 10:37:23 AM EST, bobh bobh@joba.com [TekScopes] <TekScopes@yahoogroups.com> wrote:

 
I logged in to Yahoo, went to the TekScopes group area and to photos/albums – the frames and filenames were there but no pictures. I looked at some files and then came back to the photos and they (finally) appeared minutes later. Very slow.
Bob.

Sent from Mail for Windows 10

From: Daniel Koller kaboomdk@yahoo.com [TekScopes]
Sent: Monday, November 13, 2017 6:48 AM
To: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] 7854 sticky keyboard buttons repair

 
Is anyone else having trouble viewing these photos?
  Dan

On Sunday, November 12, 2017, 4:37:54 PM EST, Chuck Harris cfharris@erols.com [TekScopes] <TekScopes@yahoogroups.com> wrote:

 
When I discussed sticky keyboard buttons on the 7854, I was
referring to the separate calculator keyboard unit that plugs
into the back of the scope, not the main instrument panel
keyboard.

Indeed, you are right, there is plenty of room around the
scope's front panel keyboard buttons. If they are sticking,
something else is wrong...Were that only true of the auxiliary
calculator keyboard.

-Chuck Harris

Nenad Filipovic ilmuerte@gmail.com [TekScopes] wrote:
Hi Everyone,

This topic has already been discussed here in the group, but what I
encountered while fixing my 7854 seems to be a bit different from what
other people reported. Since I'm quite pleased how my fixed buttons now
operate, I'd like to share what I did to repair them.

To get to the keyboard, the front panel needs to be removed, and how to do
that is not really obvious in the service manual. So:
- first remove all knobs off the front potentiometers
- lower right corner of the panel is held by the nut of the Intensity
potentiometer, unscrew it
- upper right corner is held by the nut at the back side (inside the
scope), a narrow box spanner or similar socketed wrench is necessary to get
to it, there's very little space in there
- remove the metal CRT bezel along with filter(s) and implosion protection
window
- on my device the panel was additionally secured using a double sided
sticky tape, a piece of it was under the top left corner, and another near
the center of the panel
- gently pry off the panel to release it from the sticky tape, do it slowly
with little force as it may easily be deformed if you're not careful

The photos I posted to the group in the "7854 sticky keyboard buttons
repair" album should help during the switch repair:
https://groups.yahoo.com/neo/groups/TekScopes/photos/albums/1967664831

As one can see from the images 02 and 03, there's plenty of room around the
buttons where they go through the front panel, so that was not the problem
on my device. I found the switches themselves to be problematic, even when
removed from the board. A removed switch can be seen on image 04, I'd say
the safest way is to pull it out using only your fingers and no tools. Just
gently rock it from side to side with a little helping pressure from the
back. The switch itself is composed of the gray colored outer case in which
the clear colored inner moving part is inserted. To take it apart,
carefully lift one (only one) of the retaining plastic pins on the outer
case (located at the side), be careful not to lose the small parts that
will fall out. On image 05 one can see that the outer case is slightly
warped, probably due to age. The friction occurs between the inner surface
of the outer case and the two cylindrical "protrusions" of the inner moving
part (seen on image 06). To fix it, small grooves can be filed in the outer
case on both sides adjacent to the central circular hole, image 07. The
round file used for the job was approx. 2.5mm thick. And that's it, good as
new.

Best regards,
Nenad FIlipovic
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