3 Apr
2011
3 Apr
'11
2:26 p.m.
On Sun, 3 Apr 2011, Tony Duell wrote:
I have some olde-fashioned WD40 that doesn't gum up at all. Just lubed
and cleaned the mechanism. The drive now loads slick as anything and
spins for a second or two afterwards. I think that's autonomic behavior
I've had great success using a nromal handheld
solder sucker to remove
parts from PCBs without damaging either the part or the PCB. it's not
uncommon for me to desolder a ROM from a working machine in order to dump
it out, and then solder it back in place (actually, I'd problaby put a
socket in, but anyray).
I wouild recommend a temperature controlelr soldering iron a little
hotter than normal (I use a #8 tip in my Weller TCP). A fine tip too. I
also find that dismantling the solder sucker and putting a smear of
vaseline (petroleum jelly) on the washer helps a lot. As I mentioend in
an earlier posting, a new, find nozzle on the sodler sucker helps a lot.
That's the same iron I use. Will try the trick with the jelly on the
piston ring - good idea.
I would recomend taking the keyboard apart anyway and
inspecting these
disks. You can then see if any are likely to be 'active'.
Incredibly enough, the foam disks are just fine. None of them have
decayed at all. Even with the circuit board lifted clear of the plungers,
it's still complaining about no keyboard attached. Continuity between the
keyboard and the stereo phone plug is fine. I believe the edge connector
between the chassis and the motherboard is shot. Fortunately, all the
interconnects between the CRT housing and the motherboard connector are
ribbon cables, so it's at least feasible to cut the connector off and
crimp a new one on.
> with
grease. The metal eject mechanism comes off easily (four screws=20
> from underneath, one jesus clip on the eject motor), so you can easily=20
> WD40 it to dissolve the old grease.
I wouldn't put 'Wanton Destruction 40' anywhere near the floppy drive (or
any other aprt of a classic computer). The stuff we get in the UK
contains some quite long-chain waxy hydrocarbons whcih will gum things up
after a short while. from the drive PCB itself. The system doesn't seem
to recognize that a
drive is attached, providing more ammunition for my theory that
the
motherboard connector is shot.
Steve
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