Le vendredi 17 Novembre 2006 14:56, John Hermanson a écrit :
> The main shutter gears (which are right there, just to the left of the
> circuit board) ride on 44 - 1mm ball bearings. They're supposed to be
> lightly lubricated. Naptha will wash the lube out.
Yes, that was exactly the point ; as my usage will anyway be pretty light, I'd
rather have it run "dry" instead of not running at all. And if it proves
trustworthy for a couple of month, I will re-lube ball bearings and such. But
at the moment, I just want to get rid of caked cruft. Which I seem to have
succeded in, doing so.
> As I said there were many causes of shutter lock. One cause can be the
> metal plate at the front of the mirror box floor. The underside of the
> plate (left hand side only) should have a small piece of electrical tape
> on it. Plate comes very close to the gold trigger switch posts on the
> main board. If plate does not have the insulator and touches the post,
> shutter may lock up. Also, the circular circuit board which runs around
> the meter housing should have a clear insulator on top of it.
Everything seems in order, electricity insulation wise. What buggers me was
the strong relationship betwween the speed selected and the fault occurence.
The higher the speed, the more likely the lock up. So my bet was something
wasn't setting up "fast enough" to allow firing. Hence my belief some lube
has become dry and was acting as a brake somewhere. That was all the purpose
of wiping greases clean with naphta. Today, I fired the body in every
possible configuration, bottom up and all, and it didn't lock up once. Next,
I'll put 1 or 2 film rolls through, and if it behaves allright, then, I'll
re-lube carefully.
--
Manuel Viet
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