"Rich Grise" wrote in message
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| But the problem was, it wasn't lighting up at all. A failed power supply
| could do that, couldn't it? 55V is noticeably less than 90V, albeit that
| _could_ be attributable to the meter, of course.
|
| I'm "only" a tech, but one aspect of troubleshooting is determining
| exactly where the failure has taken place, and diagnosis can be
| cheaper than shotgunning, especially if you have to make up a
| custom part.

1) It doesn't matter what frequency is used to test it with (surely?)

2) A Variac provides a variable AC source.

3) If it can't be made to work directly from a Variac at under 140 VAC it's
dead.

4) If it can be run from a Variac at a reasonable voltage it's OK

5) If it's OK, look to the inverter.

N