A Couple New Cameras for the Repair Bench: Olympus OM-1 and Yashica Atron (Minox type)

[ic-racer]

I just removed the rubber residue with alcohol. Nothing else. Near perfect result.

 

[ic-racer]

Non-MD. Low serial number 249072.

 

[ic-racer]

Just a followup on the OM-1.

First, with my camera and my workflow, I use zinc cells in all my cameras that need 1.35 volts. I have been doing that for 20 years. My OM-1 only needed to have the meter/ASA scale adjusted. There is a tiny screw for that. Even though the screw is tiny, the adjustment is large.

After the adjustment my meter readings were 0EV in the middle, -1/3EV at the low end and +1/3 at the high end. All within limits.
Essentially adjusting the calibration of the ASA dial lowered the blue curve from post #20 to the correct level.

 

[ic-racer]

While the OM-1 was open again, I had another look at its wiring. One issue with correcting the voltage with a voltage regulator is the camera body is positive ground. So the voltage correcting device would need to be between the battery and the battery cap.

However, there is another place the voltage regulator could be placed.

 

[ic-racer]

The galvanometer receives the positive charge from the battery through a jumper to the chassis (+). The voltage regulator can be placed between the galvanometer and the chassis by removing the jumper.

The ground connection for the voltage regulator can go to the on-off switch where the red wired connect.


Brown wire: from voltage regulator ground to on-off switch, (-) from battery.
Light Blue wire: from the voltage regulator output to the galvanometer.
Red wire: from the voltage regulator input to the chassis (+).

There is just enough room under the hot shoe connector, right over the viewfinder, for the voltage regulator device.