Very common for curtain speeds to be slightly erratic. Do I have to say
that I still do this work and am quite busy?
On Thu, Jan 20, 2022 at 5:49 PM John Hermanson <jhermanson21@xxxxxxxxx>
wrote:
> 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
>
--
John Hermanson
Camtech Photo Services, Inc.
21 South Lane
Huntington, NY 11743-4714
www.zuiko.com : | : jhermanson21@xxxxxxxxx
--
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