New batteries installed, when taking a photo, the mirror locks in the up position as though it is a very low light situation. Mirror can not be corrected until the batteries are removed and put back in.
I just fixed my 7n with the same problem. I think it has to do with getting the "brain" to reset. Here is what I did--With new batteries and film removed, set the lens on MF and turn the focus to a really bad setting. Now press the shutter button FIRMLY and rapidly several times. At first the mirror will change position with each press. After several times it will "magically" begin to operate correctly (including the shutter). Problem solved without ever having to dismantle anything. Also, wife is VERY impressed since the local shop guy tried and said we would have to send it off for repair!
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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.
With the scan tool, observe the mirror horizontal and vertical position parameters in the Memory Mirror Module (MMM) data list.
Operate both the left and right mirrors through the full range of movements.
Does the scan tool indicate that the left and right mirror horizontal and vertical position parameters are within the specified range?
Memory Seat System Components
The memory seat system consists of the following components:
• Power seat switch assembly
• Memory recall switch assembly
• Horizontal adjuster motor
• Front vertical adjuster motor
• Rear vertical adjuster motor
• Recline adjuster motor
• Memory seat module
• Memory mirror module
• SEAT 25A circuit breaker
• MIR/LOCK 3A fuse
Your best bet , take it to a qualified repair shop !
This is a common problem that these cameras came with, its a "glitch" in the motherboard that "turns on" a chip inside of it that pauses or freezes the normal function of the camera and it is triggered by any function/s that use that specific chip. Best thing you can do is to either get another board and install it yourself (if the camera is out of warranty) if not, don't mess with it and send it to Canon for a replacement (not a repair) of the motherboard.
You can't take photos when mirror is in lock up mode. That is used to clean the sensor(dangerous to do if not properly equipped!). Turn off power to camera to snap mirror back up and then you can switch to manual mode to shoot long exposures. Hope this helps!!
Older cameras like this are notorious for locking up after not being used for quite some time. Though, it is an easy fix, it does require some steady hands and a good memory of where everything was after you're taken it out or apart. The best solution for this is, once you've taken it apart and have access to the mirror, is to have a q-tip with a little vasoline on the tip, apply a thin (very thin) layer along all springs and joints surround the mirror and around the edges of the mirror opening, while avoiding getting any vasoline on the mirror itself. I've worked with cameras all my life and have worked at camera shops, and what I've explained here is exactly what a camera repair place would do. But, if you don't feel comfortable with small parts and tiny screws, a camera shop will gladly fix it for you, and not at a bad price. So, Good luck! Hope this helps. I hope you're out taking photos soon! Olivia~*
I have the SAME problem. I wrote to Canon and they told me to shut off the camera, take the battery out and wait 20 MINUTES! I can't WAIT that long, especially when I'm WORKING! I rely on this camera to work! Its annoying! Then they said if that doesn't work, to SEND IT IN and if its under warranty, they'll fix it for free.. if its NOT, then I have to pay for it. BUt the "technical team" will make the decision.
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.