Question about Mamiya Instant Cameras
Camera operates with dark slide in place- interlock does not work. Bad contacts? Bad back? Internal problems in body?
Battery is fresh and tests OK under load.
Problem solved- The camera does not operate correctly unless the battery is in good condition, in place, and all the contacts are clean. In the RZ76 as opposed to the old RB models the components "talk" to each other: via electronic circuits. The back "tells" the camera bod if the dark slide ins in or out and whether the film is loaded or at the end of the roll. If the batter voltage is too low or the contacts are no clean and making full contact the body has no way of knowing the condition of the film backs and the interlocking mechanisms fail to work.
What I did was firstly test the battery under load and discovered that the cell was a bit low. It was a fresh battery but it is a good idea to turn the camera off after shooting in case the is a slight current draw when the camera is idle (?) . I replaced the battery and traced the voltages through the body to see if it was getting to some of the contacts such as the onces on the meter prism which has LEDs to be lighted. I also used an ohm meter to check out continuity- everything seemed to be in order. I then cleaned all the contacts including the battery terminals withl alcohol and made sure everything was dry and clean.
Now- everything works. The camera was turned off overnight and the battery has lost no voltage when tested under load..
This camera is equipped with RB lenses which have no electrical contacts and therefore the camera and lenses can't "communicate" so the meter will not work with theses older lenses.
Posted on Apr 10, 2008
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