On Tue, 31 Jul 2001, P�l Jensen wrote:
> Chris wrote:
>
> > Where, roughly, is the cut-off date or serial number?
>
> Don't know. I was told tha only early samples was affected. If I had
> to guess then I'll say about 1985 or so.
Mine's from the early 80's, I believe, so that would make sense.
> > Also, what changes
> > could they have made to prevent sticky mirror? Pentax still has the
> > same rubber bumpers for the mirror rest that they always used to, AFAIK,
> > so how can they be less likely to gum up over time? Or did Pentax change
> > the rubber in some way?
>
> Aparently they did.
My local repair shop seems to think that the mirror bumpers they can order
from Japan are the same ones that Pentax made years ago, and they said
that some of the "new" ones are just as gummy as the ones that have been
in cameras. I don't necessarily believe what they say, though. :)
> > While the frequency of sticky mirror may be blown out of
> > proportion, it can still be a very expensive repair.
>
> Expensive? I don't think so. For $120 I got the broken switch
> repaired, new mirror bumpers, new gold resistors, new sealings all
> over, bunped out bottom plate, new left side (seen from the front) top
> panel due to a corroded shutter release lock. It doesn't cost more
> than a regular CLA wich every camera old enough to develop sticky
> mirror should have anyway.
And for about $120 CAN I had the mirror rest replaced, the ISO resistor
changed, and a general CLA done. That's until the shop discovered that
the sticky mirror was not being caused by the rubber mirror rest as usual,
but by some piece hidden up in the mirror box. To fix that would have
cost upwards of $300 CAN, very likely. I gather from this that there's at
least two different bumpers that can become gummy... one right out in the
open and inexpensive, and one in a more inaccessible place. FWIW, I
decided not to have it repaired (just changed the lower mirror rest), and
it seems to be working fine now, probably because I use it all the time.
chris
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