26 Sep
2006
26 Sep
'06
2:46 p.m.
At 19:30 -0500 9/17/06, Jochen Kunz wrote:
Fo(u)thed :-) I've cured many problems in all sorts of machines by
removing and replacing connectors, socketed ICs, and the like. Thsoe of
use with HP41s will know the ritual of taking the machine apart and
cleaning the inter-PCB connectors when it malfunctions...
Sometimes it helps this old hardware to be
"kreidlered". I.e.
disassemble the whole machine, reaseat all PCBs and connectors and try
again. (Sometimes connectors get a litle bit of corrosion etc. that is
cleand out by un- and repluging the connector.)
Thirded (1). I have a Mac Plus with Brainstorm accelerator (16 MHz 68000, plus SCSI chip upgrade). It has been
giving me fits
with intermittent operation for years. Tuning the 5V setting on the
analog board *right up* against (but not over) the crowbar seemed to
This reminds me of the hard disk problems I had with my PERQ 3a. The
previous owner had turned the PSU output right up to try to get rid
intermittant disk problems, I was not happy with this _at all_. So I
set the PSU back to the right output voltages, then decided to check the
voltages at the hard disk connector. One of them, I forget which, was
about 1V lower than it should be. It turned out that there's an in-line
fuse in that supply wire, it's in one of those holders you'd use in car
wiring with clamp screws holding the wires in brass collars. Well, one of
those screws was loose, there was a high resistance conenction there.
Tightening it up cured the disk probles -- the right way.
-tony