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05-07-2014, 02:10 AM   #1
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Pentax MX mirror stuck up

Hi

The mirror on my Pentax MX is stuck in open position. It is not the foam making it stuck because when I push it down it goes back up. The shutter works. I can see it open and close but the mirror just doesnt wanna go diwn. It thinks it is in live view mode.

Any ideas how to fix it?

05-07-2014, 03:40 AM   #2
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Has it ever been cleaned? I would suspect some oil has dried off and made a sticky surface somewhere in the mechanism.
05-07-2014, 04:16 AM   #3
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The mirror gets stuck during the longer shutter cycles, right?
Like 1/2 sec or 1/4 second. But does not get stuck in the up position when you use a faster shutter speed, like 1/500 or 1/250?
Have you tried rotating the shutter speed dial from slow to faster speeds? That often works to 'un-stuck' the mirror and return it to its normal position.

Likely a case of the mirror timer in the bottom of the camera is gummed up with goo, and needs to be cleaned.
Time for a CLA.
05-07-2014, 02:34 PM   #4
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Feels like it affects all shuttespeed. Sometimes it will drop down when I push it and fire.
Just got it from an auction so its never been cleaned I think.

Anyone know which part of the mechanism needs to be fixed? Im quite handy so its no problem but I dont know where the fault is located.

05-07-2014, 04:42 PM   #5
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QuoteOriginally posted by striker_ Quote
Anyone know which part of the mechanism needs to be fixed? Im quite handy so its no problem but I dont know where the fault is located.
It will need a CLA, which includes removing the old foam/seals and replacing them.

There are DIY kits on the internet, otherwise Eric or a closer Pentax tech is recommended.

Phil.
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