Right, finally got around to it. I couldn't see any problems, but I
cleaned the screws and threads, etc. If that doesn't work, it's off to
Nizora in January...
Matt Boland wrote:
> Thanks Moose, I'm going to whip out the multimeter and give it a go. I
> thought it might have been been components on the circuit board getting
> aged, but what you suggested is a sensible place to start. I'll let you
> know how it goes...
>
> Moose wrote:
>
>
>>Matt Boland wrote:
>>
>>
>>
>>>Hi Guys,
>>>
>>> even after trying Sony SR44W and the heralded Energizer 357s (all
>>>fresh) my OM4T continues to sometimes get stuck with the mirror locked
>>>up whilst the shutter is closed.
>>>
>>>Obviously it needs servicing. Has anybody seen this before, and do you
>>>think it will be a CLA or a circuit board mod or a new circuit board?
>>>Any other ideas?
>>>
>>
>>To repeat my post about Walt's similar problem:
>>
>>Walt Wayman wrote:
>>
>>
>>
>>>Louie is 20 years old and has never been to the doctor, so unless somebody
>>>has an easy cure, that is, one not requiring major disassembly, he's going
>>>off to see John. A complete checkup and CLA should do him good anyway.
>>>
>>
>>
>>Well, I'd have his bottom off (Oh Lord, here come the comedians, duck!)
>>to check out the wire to the battery compartment spring and its
>>connection to same. I'd also clean out the threads on the cap and socket
>>throughly. While I had the bottom off, I'd also make sure the screws
>>that hold it on are clean. You can check the resistance from the threads
>>the cap fits into to the body to make sure that end of the connection is
>>good. The current has to go through the battery => cap => bottom plate
>>=> screws => camera frame. Lots of places for dirt, corrosion, etc. to
>>raise the resistance - and it could be cumulative. All the other
>>functions of the camera require very low currents where the voltage drop
>>from a low, but not low enough, resistance is minor. It is only when the
>>mirror goes up and the magnets start to operate that higher current is
>>needed. And that is when the low voltage protection circuit kicks in if
>>the voltage under that load is too low.
>>
>>Moose
>>
>>
>>
>>
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>
>
>
--
Matt Boland (BEng) Phone : 61 7 5594 9824
R&D Engineer Mobile : 61 4 0835 1421
Odyx Corporation Pty Ltd email : mattb@xxxxxxxxxxx
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