Canon 40d motor revival in the body of a 7d

This is a story about my own 7d, which has been flooded with water, before I have purchased it “as it is”, practically not working. I repaired it in a few hours -worked well after.
After a certain time stopped working, message was Exposure not possible, ERR20. Mirror moved up, but the curtain not. Other lots of hours of repair, disassembly-assembly. Normally I should change the shutter, but is really expensive. So i have rather bought the SPT software for the 7d.
I have read out the fault memory. And it was a problem regarding – the mirror motor position.!!!
Disassembled again – no sign of anything unusual.
Assembly – works. Second day in the morning – NOT working.
I resoldered MANY times a damaged cable socket, which was not so easy, as the former corrosion has damaged the contact surfaces.
Then I realized, that touching the motor, the camera works. Pushing it in another direction, the fault appeared immediately. Wow.

The motor here, in the 7d is fixed to it’s frame only through 2 flexible points – 2 screws and two rubber collars. I disassembled a 99% similar motor from an old 40d – this has no flex joint, just two screws. No problem – I had no other solution anyway. So, i made both operations (out and in). And even after 3 days the camera is working perfect.
So, never give up!


7d h  7d-2h

About canonrepair

Ruzsa János. Amatőr fotós, Canon DSLR váz. Amateur photographer. Canon DSLR user.
This entry was posted in 7d, Canon camera. Bookmark the permalink.

4 Responses to Canon 40d motor revival in the body of a 7d

  1. Javier says:

    Hey Janos which is your email. I sent you an email via gmail, but dont know if you got it:
    Let me know and thanks.

  2. Javier says:

    Janos hello. I dropped my 40D and it gives me error 99. I disassembled whole camera and tested shutter (after inspection, no evident physical damage) and seems to work when applying voltage to motor. i then went to disassemble mirror mechanism, and 2 spring popped that i have no idea where they go. Do you happen to know where they go? Or do you have any diagram showing this?
    Thanks for your very helpful repair blogs.

    • canonrepair says:

      hi, the 2 small springs come over the blades, I think they just reduce the backlash.
      at the moment I dont have a photo how they are assembled, will try to send you later. case forgotten, drop me a mail.
      your problem could be the broken winding wire, or the rubber bumpers at the end of the curtains travel. 2 pcs of rubber, like a half circle.

      • Javier says:

        Ok, but my problem now blem now is the mirror mechanism. Qill sen you pics later. 2 springs popped out and 1 i dont know where it goes.

Opinion, question?

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s