Question about Nikon N70 35mm SLR Camera

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Mirror Locked in Up Position

When i tried to use my N70, which had sat idle for a couple of months, the mirror locked in the up position. The batteries are almost new. The battery indicator indicates full charge. I returned all settings to those that were set in the factory and put in a new roll of film. The mirror is still locked. Do you have any suggestion on how to release the mirror and what might be wrong? Thanks

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  • klawoffice
    klawoffice Aug 17, 2012

    I have the same problem, and nothing you've said to do worked. What now? Thanks.



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When you say you put in a new roll of film, did the camera advance the film with the mirror locked up? Have you tried triggering the shutter few times to release the mirror? If that doesn't work, open the back of the camera. Turn the film take up spool in one direction...that should release the mirror down. Turn it also in the opposite direction. If that doesn't work, reach inside the lens mount opening and pull the mirror (very very gently) down. Don't force it down if it doesn't want to go. Sometimes that releases the mechanism that freezes from sitting idle for too long. It is always a good idea to take the camera out and triger few frames every couple of months to keep things lubricated. Let me know if that fixes it. AJ.

Posted on Sep 21, 2007

  • John Mickevich Nov 21, 2011

    Hello, I realize that this was posted over 4 years ago, but I am curious if you were able to resolve your mirror stuck up problem with your N80? I just had one given to me, took one picture, then received the ERR message. The mirror is now in the up position and the ERR will not go away. Thanks! John.



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BCM has nothing to do with this function , MMM - memory mirror module !
Memory Mirror System Operation
The MMM is capable of storing mirror position for 2 different drivers. Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The MMM supplies a reference voltage and a low reference to these sensors and determines mirror position through the horizontal and vertical position signal circuits.
The MMM receives power through the battery supply voltage circuit and the MIR/LOCK fuse and a constant ground source. Any time that battery voltage is disconnected and then connected from the MMM, the MMM will enter the mirror relearn mode. The mirror relearn mode can also be commanded using a scan tool. Refer to Memory Mirror Module Learn for further information.The memory switch receives power through the battery supply voltage circuit and the MIR/LOCK fuse. The MMM upon receipt of a memory switch signal input, a class 2 message from the SIC or a class 2 message from the PCM indicating that the transmission is in park, will then supply battery voltage and ground to the appropriate power mirror motors through the mirror motor control circuits to move the mirrors to the predetermined positions.

DTC B1586, B1596, B1616, or B1626
The mirror horizontal and vertical position sensors are potentiometers. The Memory Mirror Module (MMM) provides these sensors with a 5 volt reference circuit and a low reference circuit. The MMM monitors the horizontal and vertical position sensor signal circuits which change values based on mirror position. These voltage values are used to determine mirror position and can be set into memory. When the MMM receives a memory recall request, the MMM will control the power mirror to the memory position based on the horizontal and vertical position sensor signal values.

Install a scan tool.
Turn ON the ignition, with the engine OFF.
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Does the scan tool indicate that the left and right mirror horizontal and vertical position parameters are within the specified range?

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Possibly the shaft has jammed. Follow this link for a source of good information:

From their files:
The locking knob has a gear on the inside end of its shaft. It engages teeth on the outside edge of a large metal disk connected to the mechanism that locks the position of the mirror on the central baffle tube. Rotating the locking knob one direction rotates the large disk to tighten the collet on the central baffle. Reversing direction loosens it.
The teeth do not extend all the way around the large disk. So sometimes the locking knob gear jams to a stop before the lock is fully engaged. Soon after the GPS scopes first started shipping Buck Harley discovered that in such cases you can remove the locking knob with its shaft and gear, then reach in and rotate the large disk with your finger. Replacing the locking knob will now allow sufficient rotation to fully engage the lock. If you happen to move the large disk in the wrong direction, then just repeat the process and move the disk in the other direction.
You don't need to tighten the lock down hard. Just a little snug is enough. You should not attempt to use the coarse focus knob while the mirror is locked. Damage to the focusing mechanism could result.
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