On 29/9/04 3:03 am, "Ryuji Suzuki" <rs@xxxxxxxxxxxxxxx> wrote: Ryuji suggested degreasing- Your local watch repairer may be prepared to put the assembly through his degreasing line, which will include the solvents mentioned. David Ogden > From: Leigh Solland <solland@xxxxxxxxxxxxxxx> > Subject: [pure-silver] Help?! Minolta Autocord > Date: Tue, 28 Sep 2004 19:39:37 -0600 > >> I opened it up to look at the lens from behind, and did some "dry" >> shooting, and while the shutter always sounds like it releases, it >> only opens sporadically. I was not able to find a way to make it >> fire every time, or not fire every time. The missing (or present) >> pictures on the developed films appear to be completely random. > > My best guess is grease contamination of the shutter blades. > > A few questions for additional clue: > > - can you charge the shutter immediately after the false firing? > - does the true firing probability change in cold/warm place? > - can you control the shutter speed over the entire range > whenever the blades open? > >> As I see it, we could go into counselling, or I could start ripping > it open. Before I do the latter, I want to ask the assembled brain > trust here for any suggestions or ideas. > > Shutters in TLR and rangefinder cameras like Minolta Hi-Matic 7S, > Konica Auto S2, Canonet QL series, etc. are among the easiest to work > on, but I wouldn't expect to do anything without damage on your first > camera to repair. > > If the problem is indeed grease contamination, the only sure fire > method is to take the shutter off, take the blades off, immerse the > blades in cleaning solution (most common is lighter fluid. I used to > use a mixture of xylene and acetone, and dry methanol in alternating > way, cleaning at least once in each solution), wipe off the grease, > and dry. Of course you'll have to put them back on, which also takes > skill. > > But then if you do it, I'd recommend to clean the aperture blades and > shutter unit at the same time as well. > > -- > Ryuji Suzuki > "Keep a good head and always carry a light camera." > ============================================================================== > =============================== > To unsubscribe from this list, go to www.freelists.org and logon to your > account (the same e-mail address and password you set-up when you subscribed,) > and unsubscribe from there. ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.