15 Dec
2009
15 Dec
'09
2:25 p.m.
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