I have an original IBM model M keyboard (US 101-key layout, P/N 1391401).
This keyboard dropped very hard on the ground. IBM made these keyboards very
robust, but this treatment was too much.
Actually, I don't think the type M is as robust as the older (PC / XT
keyboard and the 84 key AT keyboard). The older ones had a lot more metal
in them and were not assembled by heat stakes. Incidentally, the type M
uses conventional membrane swtich contacts (operated byu the flaps), the
older ones arew capacitive and presumably more reliable.
I ahve had a couple of type M's where the heat stakes have broken away
during normal use. The result is that some of the flaps move out of
position and those keeys then fail to work (or in some cases appear to be
Anyway, whact I did to mine was to cut the black key frame into rows.
Then dril lout all the heat stake posts and tap them M2.5. Then fit
screws through them. Assemble a row of flaps at a time to the baseplate/
memberane layers and fix them with M2.5 nuts.
The black support frame with all the chimney is
(this happend before I removed it from the metal base plate :-)
How bad is it? Is it just split into rows (not a problem, it's easier to
assmble that way) or are some of the key locations broken?
Does anyone know a source for this black support frame P/N 1385796 ?
(besides buying a donor keyboard)
AFAIK it was never avaialble as a spare part from IBM (other than as the
complete keyswitch assembly, less most of the keycaps). If you can find
anotehr broken keyboard soe that you can have all rows intact, then you
can fit parts of the 2 frames to the same baseplate.
Does anyone knowns where IBM purchased them from ?
(I can't believe that IBM made these themselves)
Why not? I think they did. The older capacitve keyboards had one of those
sqaure iBM metal-can ICs in them, so I would think that was an IBM