19 Dec
2007
19 Dec
'07
3 p.m.
I'll be cracking the case as soon as I return from
my holiday travels.
Between this and the Radio Shack Tech Reference, I think I'll be much better
prepared to fix without breaking.
The official TechRef is pretty good on the disk drives, althoguh since
the drives are standard units, it's always possible your machine has some
other drive in there. Compare the PCB against the layouts in the manual
to be sore. And IIRC my TechRef has an extra section on the later version
drive that has the spindle motor speed control cirucit on the main PCB.
But don't beleive the PSU section in the manual _at all_. Ok, the PSus in
my M3 and M4 (all the same PSUs, BTW), are the 230V model, so you'd
expect some differences, but there's very little in common between the
PSU and the one i nthe manual. Worse, the diagram in the manual couldn't
possibly work IIRC. The PSUs were not made by Radio Shack, they're Astec
units, and I susepct Astec would not supply scheamtics so soembody at
Radio Shack reverse-engineered it and didn't do a very good job!
-tony