Mamiya 7 65mm Lens: Flex Cable, Cold Shutter Delay, Focus Issues
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
This Mamiya 7 65mm lens came into the shop with a few issues:
Broken flex cable (very common)
Delayed shutter release
Focus issues
The broken flex cable is straightforward, it needs to be replaced. Photo two shows the flex cable getting ready to be removed from the contact assembly and you can see the cut in the flex at the first contact.
The delayed shutter release I could not replicate. However, since this lens came from a client in New Zealand and it is a bit colder there right now compared to my desert location (Southern Nevada), I cooled the lens down to freezer temperature and sure enough it would delay releasing. After warming up, it worked OK. So this tells me that the shutter release magnet is probably contaminated at some level.
After removing the shutter from the lens and carefully looking at the release magnet, I could see some residue on the surface. Photo four shows a close up of the magnet and if you look closely there is material on the contact face. I don’t know what this residue is made from, can’t say that I have seen it before on the magnet. After cleaning the magnet all is fine.
The focus issue was caused by the rangefinder cam being out of spec. Since the lens needed disassembly just to remove the flex cable and shutter, the rangefinder cam and focus get checked and adjusted as part of the service. mamiya mamiya7 mamiya7II camera repair
