[GreenKeys] Fwd: M28 ASR jammed keyboard

[W2HX]

So jealous of you guys with navy gray tty (and Klein) equipment!

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of Duncan Brown
Sent: Tuesday, December 13, 2022 9:50 PM
To: Green Keys <greenkeys at mailman.qth.net>
Subject: [GreenKeys] Fwd: M28 ASR jammed keyboard

(forgot to add picture)


-------- Forwarded Message --------
Subject:
M28 ASR jammed keyboard
Date:
Tue, 13 Dec 2022 21:48:51 -0500
From:
Duncan Brown <duncanancy at earthlink.net><mailto:duncanancy at earthlink.net>
To:
Green Keys <greenkeys at mailman.qth.net><mailto:greenkeys at mailman.qth.net>


Just pulled a M28 ASR out of storage that had been working, but now it has a  jammed keyboard.  Both the [N] and [LTRS] keys are stuck down. (I think the [M] was stuck originally, but it seems OK now) There is no [KYBD LOCK]  button on this keyboard. Printer & tape reader run fine. (Jingle Bells tape sounds much better on this M28 than on M15!)

What is a typical cause of these keys sticking ? (I thought all those ball bearings were supposed to prevent that)

How do I fix it? Not obvious how to get into the keyboard and I image if you take the top plate off the keyboard, you will have a heck of a time getting all the keys back in!

Looked at Bul 249 & 1169, but they were not much help. Parts manual (B1169) does not show how keys sit in keyboard cover.
#573-117-702 gives some disassembly instructions, but no diagrams of what they are talking about. (They do reference tho parts manual, but not too helpful if you don't know what you are looking for.)

I have pulled a chassis from a M28 KSR before. There was a metal cabinet piece across the top of the keyboard that could be removed from inside the cabinet to free the keyboard.
This ASR cabinet seems to only have a release/break of the metal strip above the keyboard on the right side of the keyboard.  The metal piece above the keyboard seems to run to the left, around the perf and be solidly connected to the cabinet. Yet this piece must be removed to remove the LAK keyboard & base?

Can anyone give me some direction?

Thanks,

Duncan
K2OEQ
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20221214/25fb6c6e/attachment.html>