29 Apr
2013
29 Apr
'13
5:52 p.m.
On 04/29/2013 04:42 PM, Mike van Bokhoven wrote:
Vague memories from 25 or 30 years ago, and maybe from
the wrong
model of II... the keyswitches have a couple of little tabs on each side
on the keycap side (top) of the KB. They need to be squeezed in to
release the keyswitch.
That did the trick - there was so much crud under the keytops that I didn't
realize earlier that they were tabs holding the switch in place (I thought
they were just something holding the switch body itself together). Thanks!
After removing the switch, I dismantled the switch body and found that one
of the metal pieces inside had been bent out of shape (the solder joints
for this switch had failed on the PCB due to the impact, and evidently when
the PCB rebounded after, the metal pins on the underside of the switch had
been pushed back into the switch body, buckling one of the plates inside).
Anyway, I did some very careful straightening and all seems to be well again.
Next task is to bridge the broken keyboard PCB tracks, and then fingers
crossed I'll have a working system. Without the keyboard plugged in it
displays garbage color blocks on the screen and occasionally utters a
string of beeps; thinking that the keyboard was entirely passive, I just
spent some time checking PSU voltages, reseating ICs etc. before finding an
old VCF forum post hinting that this might be the correct behavior in
absence of a keyboard. D'oh! :-)
cheers
Jules