29 Aug
2022
29 Aug
'22
6:38 a.m.
I have just worked out how to dismantle the keycaps, although still
wondering if cleaning them will actually help?
-----Original Message-----
From: Rob Jarratt via cctalk <cctalk(a)classiccmp.org>
Sent: 29 August 2022 11:26
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk(a)classiccmp.org>
Cc: Rob Jarratt <robert.jarratt(a)ntlworld.com>
Subject: [cctalk] Advice on Repairing a HP1630G Logic Analyser
I have a nice HP1630G logic analyser. It still works OK but has a number
of
issues that I would like to fix.
First, I managed to break the power switch. It became stiff and wouldn't
readily toggle the power. I think the shaft became bent. In pressing too
hard,
I broke off the button on the end of the shaft.
Looking at it, I think the
button may have been glued onto the end of the shaft, possibly in a
previous
repair. There are some sites that list the button as
available so I am
trying to
source an original, but I think it could be just the
button and not the
shaft
that goes with it. However, if that proves impractical
or too expensive, I
am
wondering if it is possible to source a new switch,
with a long shaft to
reach
the switch on the board, that would at least allow me
to toggle power from
the front panel? I am not sure what to search for though, any suggestions?
I
have several possible workarounds: 1) just leave the
switch on permanently
and "toggle" the power just by plugging into the mains
2) try to glue the button back on, possibly with a metal pin for strength,
but I
think there is a bend in the shaft that caused the
action not to work well
and
so this may not work well 3) Raid a spare from a
HP1630D that I also have.
4)
try to make a new shaft and switch, possibly 3D
printed, or just use a
piece of
wooden dowelling. Any comments on these approaches?
The other problem I have is that I get terrible switch bounce from the
front
panel keyboard. I have removed the keyboard to see if
I can get at the
switches and see if cleaning them would help. However, the keys (made by
Cherry) look like sealed units to me. Again, does anyone have any advice
on
how to improve the performance of these switches? I
could again raid my
HP1630D for a spare (which has a keyboard that isn't as bad), but would
rather not have to do so.
Finally, I get a bit of screen wobble on the display. I am going to check
all the
capacitors on the display board, but any other
suggestions?
Pictures of the broken switch and the keyboard are here:
https://1drv.ms/u/s!AgETuZFainX8gZNMqek10fyE3n1rlw?e=xd7RWU
Regards
Rob