Originally posted by richandfleur The notes on my service state:
REPLACED DIAPHRAGM MECHANISM- ADJUSTED & CALIBRATED- CLEANED- CHECK & TEST
Pretty much what it says. There are several mechanical pieces that work together to operate and coordinate mirror movement and diaphragm actuation. They constitute a single sub-assembly. For some repairs, the controller circuit board is replaced as well.
Originally posted by richandfleur Can this Diaphragm Mechanism be purchased separately from somewhere.
I don't know about N. Zealand, but in N. America and Europe, Ricoh Imaging does not offer repair parts to other than authorized service facilities. FWIW, it is the opinion of some forum users that Pentax has been using the same or a very similar mechanical assembly in its dSLR bodies for nearly a decade. The exceptions are the K-3/K-3II which have separate units for mirror and aperture. whether the unit from say, a K-5, will work in a K-30 as a drop-in replacement is not known.
Originally posted by richandfleur Does anyone have access to the Pentax repair instructions etc?
You can buy a copy of the K-30/K-50 manual:
PENTAX K-30, K-50 Series Service Manual
As you are aware, there are some folk in Russia who claim they have a fix. There is a long discussion thread:
https://www.pentaxforums.com/forums/151-pentax-k-30-k-50/321871-k-30-k-50-ape...available.html
The thread has a lot of conjecture and sort of wild talk, but may help you on your way.
Steve