Sorry, that should have read "cw slows curtains down".
On Thu, Jan 20, 2022 at 5:48 PM John Hermanson <jhermanson21@xxxxxxxxx>
wrote:
> There are 2 small screws under the MD switch. Turning them
> counterclockwise speeds curtains up, ccw slows curtains down. 2nd curtain
> should be .1ms slower than the first (that's 1/10,000 of a second).
> People often start twisting away, ending up with a shutter that doesn't
> open above 1/250, or doesn't have enough "ooomph" to release the mirror, OR
> if you do it just right, the curtain springs will unwind completely.
>
> On Thu, Jan 20, 2022 at 4:47 PM Wayne Shumaker <om3ti@xxxxxxxx> wrote:
>
>> At one point I had tested the shutter curtain with photo detector and
>> scope. Often one curtain would move faster or slower than the other. I
>> recall there were some adjustment to that, but I never knew the best way to
>> tune them. So I let the expert do it, John H.
>>
>> There is a service manual online for the OM-4T that goes into calibrating
>> the electronics, but nothing on tuning any of the mechanics.
>>
>> Does anyone still do this kind of CLA work? And if not are there any
>> clear descriptive resources for a DIY?
>>
>> WayneS
>>
>> --
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>>
>>
>
> --
> John Hermanson
> Camtech Photo Services, Inc.
> 21 South Lane
> Huntington, NY 11743-4714
> www.zuiko.com : | : jhermanson21@xxxxxxxxx
>
--
John Hermanson
Camtech Photo Services, Inc.
21 South Lane
Huntington, NY 11743-4714
www.zuiko.com : | : jhermanson21@xxxxxxxxx
--
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