oh, i've spent close to $200 rebuilding a mac SE which would spazz out
whenever I tried to install the OS on it. swapped the mobo, still problems.
swapped the floppy drive, still problems. swapped the power supply, internal
SCSI cable, floppy cable, in the process broke the neck of the CRT tube, got
pissed, spent 3 total days trying to throw everything I had at this machine,
then while messing with it late one night, thought to swap the ram out. it
booted, ran the installer, installed to HD, and worked just fine. the ram is
worth, what? $10 max? basically, never rule out anything simple.
On Tue, Dec 15, 2009 at 1:25 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Sigh. And my second (and final) followup, this time with very red face.
Err, why? You fixed it, didn't you? Alas not every fault requires a
service manual and 'scope..
No electronic repair was needed. Yes, it was a
gummed up power knob.
Spritz
with contact cleaner, push in and out a few
times, and it's good as new.
Carry
on about your business while I hide under a rock.
Perhaps I shouldn't mention the time I spent figuring out why an SMPSU
just wouldn't start up. Fuse on the PCB was fine. Switch was fine. What I
took to be t he startup resistor (no schematics) tested fine. Chopper
transsitor was fine. And so on.
Tuens out somebody had removed the fuse from the mains plug (UK BS1363
mains plugs contain a cartridge fuse). There was no other fault...
-tony