Mamiya C330 distance scale shutter - a horror tale
My flu is still very bad, so I had a chance to see what I can do about the inoperative distance scale shutter on my Mamiya C330f. It’s easy to remove a side cover, so when I took it apart I saw a puzzling combination of levers, all misplaced perhaps by a previous repairman. The aluminium shutter was firmly kept in place by a piece of wooden matchstick. I had to figure out how the whole system works, and that wasn’t too easy – as I have expected, the scene was missing something important. The scale shutter unit seems to be of exceptionally bad mechanical design – I even thought that some guys from Krasnogorsk or Arsenal should have sneaked in Mamiya constructors’ office and changed something in their blueprints :) The shutter is spring-closed, there is an another long lever on the cover, also spring-loaded, that transfers a movement from an another lever that senses a small chromed screw on the rack. This latter lever should theoretically have a small steel pole on it, against which an adjustable screw of lever 2 presses. This adjustment screw is needed to adjust an infinity position, and can be found under a small black plastic cover. The problem with my camera was simple – thanks to ingenious design, the pole was broken off the lever, so it became disconnected. I didn’t find it inside the camera, maybe it was thrown away. I tried to make it from good copper wire, but with no success – the load on it is so high that it was bent off from its place after 10-15 focusing movements back and forth. I think the only way to cure it is to make a steel pole again, but with no warranty that it won’t be broken soon like an original one. I did find some information about numerous problems with distance scale among C330 users. Maybe the main source of troubles is a weak pole that breaks off the lever? Judging from the lever shoulder ratios and springs employed, it SHOULD break sooner or later. I will try to fix it from the pure interest, but I seriously doubt that I would ever use the distance scale. So my advice is: if your C330 does not open a shutter on a scale, weep not – it seems to be a serious headache to fix, and not much gain. Interesting enough, how many other fragile poles have been put in C330 by its constructors, eh? :) Fortunately in left side compartment of C330 is no big gears whose tooth could be damaged by a broken piece of steel.