Clint Wrote:
>>First, discharge the main and trigger cap (300v is gonna bite you
>>otherwise!). Then check from the x-pin to the white wire going to the middle
>>of the top circuit board. It's not likely the problem, but...
<<
Whatever you do when you discharge the capacitor don't short it out directly,
as you may sputter copper vapour in your eyes from the immense spark ,if it is
still fully charged! You should do it with a resistor but not too low a value
as it could also shatter. I did this once with a high wattage resistor (20W,20
ohm) and it shot a piece of epoxy acrross the room. Idealy you need to use
something like a 1Watt 5k Ohm resistor and you need to leave it on a while, say
30sec to be sure it is fully discharged. Better yet, make sure the cap has ~0V
on it, at the end by using a voltmeter. A general good idea when working on
flashes, is to put a cliplead across the capacitor after you have discharged
it, so you can't inadvertently charge it up.
If you don't have a suitable resistor hook up a voltmeter across the capacitor
and wait until it has self discharged to less than say 15V. It may take a
while but it will drop eventually. The T20 self discharges reasonably quickly
compared to some other flashes.
Tim Hughes
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