… or not the shutter?!?
One of my customers has a 5d MkII. Time to time the camera stopped working with error code 30 after shooting. This is a general error code: “
Description: A malfunction with the shutter has been detected.
Resolution: Turn the power off, then remove and re-install the battery. Then turn the power on again.
Normally in an official service you ill get an offer for a shutter exchange. But after 33000 shutter activations?!
Reading out the internal error memory with the SPT software, I have got the following error list:
Ok, this looks a little bit better, as I had in the past a similar problem with some 7d bodies. After disassembly, I checked the mirror motor, if it is loose or not, as that can cause a blocking of the motor during activating the mirror. But it was not the case.
Before replacing the shutter unit (150 USD), I decided to check it disassembled. The 5d MkII has a complicated shutter, more reliable than the small cameras.
ATTENTION: this cameras have a CMOS (sensor) with screw adjusted position. Seems to be with shims – but be careful: under the shim you have a rubber-bumper, which modifies it’s hight as you tighten the screw….
Disassemble ONLY after measuring the original position of the CMOS regarding to the body flange, or you will not be able to mount the CMOS in it’s original position anymore (better o say, only very difficult, as you don’t have the equipment of an official service.
Let we see the shutter:
In this case the curtain springs are cocked by the motor, and hold by two small mechanical triggers. In case of exposure, this triggers will be released by two small oscillating motors – I mean, some motor-like mechanisms, which can execute only a 45 degree rotation with a single coil.The motor has a mechanical position sensor (phase sensor with brush), the curtains have opto-couplers.
A few soldered parts on the flex cable – so even the soldering could be a problem (cracked cold soldering points).
It is very easy to dismantle, but You will have to desolder at first the two coils from the flex cable.
The phase sensor was clean, no oxide spots, no short between the lanes (check always with 20 kohm or 200 kohm setting on the multimeter!) . We are talking about a short to ground for a signal.
I have seen only one strange thing: some sticky grease on the curtains. I washed them submersing in some brake-cleaning fluid ( a kind of light white spirite)
Be careful by assembling – always make some photos about the order of the blades and springs and washers….
As I could not see any spectacular fault, really nothing unusual, I decided to resolder all parts, the diodes, the capacitors, the optocouplers – and the coils. I observed that the original soldering alloy is not a very soldering-friendly material (probably lead-free) – so I used my own normal, Pb-Sn alloy, and a lot of flux.
I assembled the camera with some doubt about the final results – so I mounted the CMOS without any adjustment, just to check the shutter (but for this, you have to connect all boards, parts, back of the camera.
And NO ERROR anymore. Checked in shot-by-shot,checked in machine gun mode –nothing. Wow.
I disassembled the whole camera again, I adjusted the CMOS, mounted all screws with Loctite 243 (threadlock).
Checked the camera…..
… and ERR 20.
That was the point when I started to think how to give back the camera to the owner unrepaired, and to change my hobby on fishing or solving crossword puzzles… anything excepting repairing Canon cameras.
After 5 minutes of staring to the infinite, I disassembled the bottom of the camera – and I found the missing plug on the bottom PCB – the shutter motor was not connected
Remark: this time there was ERR 20, not ERR30!
I checked the the camera a few times again, I glued the rubber covers, and I went sleep. (2 o’clock in the morning.)
Today I will have to adjust the AF sensor of the same camera, as the central AF point has a bad factory (!) adjustment: on vertical and horizontal lines gives different focal distance, ca. 1 cm on 1 meter. For the owner this means ca. 50% of the photos out of focus, as the owner never knows, which sensor will be finally used.
I hope, the shutter will be still alive.