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 thread  Author  Topic: Ze quartz stuck at 1/60s  (Read 234 times)
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xx Ze quartz stuck at 1/60s
« Thread started on: Jan 26th, 2017, 02:45am »

Hello, I recently bought the mamiya ze, it seems to be in a very good condition, clean and no sign of physical damage.

However whenever I pressed the shutter halfway, the speed indicator always lights up at 1/60s. Seems that no matter what the light condition is, it'll stick with that speed.

Any idea how to reset this or fix it?

I've tried cleaning the battery contacts also loaded it with brand new batteries too. Thanks a lot, it would be great if I can get a bit of pointer.
« Last Edit: Jan 27th, 2017, 04:32am by Rv35 » User IP Logged

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xx Re: Ze quartz stuck at 1/60s
« Reply #1 on: Aug 29th, 2017, 12:46am »

Hi Rv35,

Just in case you are still lurking about, I'd like to post some thoughts that might help.

I have never owned your particular model, but do have the wiring schematic for the ZM Quartz and that could shed some light on your problem.

The display circuit is separate from the actual metering circuit and the control circuit for the aperture and shutter. In fact, the metering and control are calculated using analog comparators, and the display is calculated from the control voltages of the output also by cascading comparators to translate it into numbers. None of this is numeric in the sense of a digital computer until it hits the display driver.

In short, it is possible, even likely, that the only thing wrong with the camera is the display circuit. You can test this without film by setting the sensitivity to ISO 64 and pointing the camera at a bright lamp in a dark room, releasing the shutter, then turning away to face the dark shadows and releasing the shutter again. There should be an audible difference in the exposure times. To check the aperture control you can similarly open the back while releasing the shutter and rotate the aperture ring from f/2 to f/16. The size of the aperture should seem smaller as the duration of the exposure increases. (Be very careful that nothing ever touches the metal shutter curtain.)

If all that checks out, then it's time to try a roll of film and not worry about what the display reads out.
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