[pure-silver] Re: Help?! Minolta Autocord

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."
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