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Re: [OM] OM-4t servicing

Subject: Re: [OM] OM-4t servicing
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Thu, 20 Jan 2022 16:04:15 -0700
I did not know. That is super great. Thanks John. For some reason I assumed you 
had
retired from this work. It has been a while since my hands touched an OM-4T.

WayneS


At 1/20/2022 03:52 PM, you wrote:
>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
>
>-- 
>John Hermanson
>Camtech Photo Services, Inc.
>21 South Lane
>Huntington, NY  11743-4714
>www.zuiko.com   : | :  jhermanson21@xxxxxxxxx
>-- 
-- 
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