Olympus-OM
[Top] [All Lists]

[OM] Re: Mirror Locks Up on 4T

Subject: [OM] Re: Mirror Locks Up on 4T
From: Matt Boland <mattb@xxxxxxxxxxx>
Date: Sun, 05 Dec 2004 18:57:04 +1000
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
> 
> 
> 
> 
> ==============================================
> List usage info:     http://www.zuikoholic.com
> List nannies:        olympusadmin@xxxxxxxxxx
> ==============================================
> 


-- 
Matt Boland (BEng)                  Phone  : 61 7 5594 9824
R&D Engineer                        Mobile : 61 4 0835 1421
Odyx Corporation Pty Ltd            email  : mattb@xxxxxxxxxxx


==============================================
List usage info:     http://www.zuikoholic.com
List nannies:        olympusadmin@xxxxxxxxxx
==============================================

<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz