However, they seem to be a lot less use when
it's a one-off unit which
you need to repair no matter what (like a classic computer). You're going
to have to do real fault diagnosis sometimes anyway, it doesn't make it
much more difficult to do it properly every time.
I'm sure that by now, if a stock fault was going to appear it would have
done so by now. In my experience they tend to be design problems more
than anything else - like, oh for example, VT100 under-rated capacitors...
Conversely, the fault has probably appeared on that unit, been repaired
with better-rated components that don't fail again, so the current fault
is due to something totally different :-)
In that
case, for example, if you got a Ferguson ICC9-chassis TV on the
bench with no EW correction and excessive width, you'd go straight for a
particular electrolytic somewhere around the scan drive circuit.
Annoyingly enough I can't remember which one and my telly has just
started doing that...
Alternatively you could get out he schematic, _understnad it_ and work
out what components could cause this problem.
If the schematic was available. In any case it's a pretty bog standard
Are you seriously telling me the ICC9 service manual is not available
anywhere? Because I find that very hard to believe (our TV, based on the
ICC5 chassis, came with a sheet entitled 'customer service information'
One side was a schematic, the other side was the layout and alignment
instructions).
-tony