RZ67II: Rough Focus From a Broken Fine Focus Gear
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
Servicing a Mamiya RZ67II. This body came into the shop with rough focus. In the case of an RZ67II, this is almost always a broken fine focus gear. My guess is that the material in the gear deteriorates after many years and then it does not take much (light impact on the focus knob) for it to shatter. Often, as in this case, the pieces of the broken gear residue get stuck in the focus gear and fall inside the side cover cavity. After cleaning out the side cover and installing a new gear, focus is now smooth.
The third photo shows a new gear installed and the final photo shows the damaged gear after being removed from the body.
