Mamiya C330f focusing rack jammed - repair manual

[emmef2]

Yesterday the focusing rack of my C330f jammed without any apparent reason.
At first I noticed increased resistance of the focusing knob when moving the rack out from the camera for about an inch.
Then I made several complete movemements of the rack from the rest position to maximum extension and back, the rack looked perfectly aligned and the camera has suffered no hit, but there was a noticeably resistance for the first inch of travel.

Today I tried operating the focusing knob as usual but I noticed a very strong resistance and didnt want to force the movement.
I am wondering if this has ever happened to someone, I do not know of any Mamiya repairman in my area and I am looking for the C330 repair manual if someone has one to share

thanks

[Pete B]

Are you certain it's not the little lever at the front (focus brake)?
Pete

[emmef2]

Thanks Pete, unfortunately it is not, and the knobs makes a greater resistance than when the focus brake is engaged.
Anyway I also considered if the camera could have engaged the focus brake without the lever

[Pirate]

If it's not the focus lock, then here's another possibility.

Check your strap lugs.

My C2 has a lug that came loose. When there is no tension on my strap, the lug flops around a little and will jam the focus rack and it will not move.

Just a thought.

[Pirate]

Just curious if there was any progress on this one???

[emmef2]

I unscrewed the six screws that are on the bottom of the camera and removed the bottom plate that allows seeing the focusing rack.
The focusing rack seems not locked by anything, advancing is a little stiff as it was prior to get stuck, but has dust on it. Maybe it just needs cleaning and a little lube. Havent worked on it in the past days because I do not have the cleaning agent and the oil.
I will post updates
thanks

[kerne]

The only repair manual I know of freely available is for the C220. I know there are significant differences between the two, but maybe this will help get ya started.

http://www.butkus.org/chinon/mamiya/...220_repair.htm

[Atto]

thanks for the repair manual for my C220.

[emmef2]

I already have the repair manual for C220, thanks anyway

[emmef2]

As I posted earlier the problem was just with dirt on the focusing rack.
I cleaned everything and added a very small lube and now the focusing rack moves so smoothly!

[pb908]

in case you have similar issue, check my finding at
http://www.rangefinderforum.com/foru...d.php?t=122592

[emmef2]

I did, thank you, it is great to share our findings!