Canon EOS – no communication with SOME lenses (70d)

It was a Canon 70d – but as we have seen at the end, in fact could be any camera.

The owner told me, that the camera can work with different EF (full frame) lenses, some Sigma lenses – but cannot see the EF-S 17-85 or the EF-S 18-55.

??????????????????

The owner has observed, that one pin from the bayonet is shorter, than the others. The EF-S lenses are probably a little bit different from the EF and the Sigma, so they didn’t get the supply voltage.

I disassembled the camera, and I have found this:

WP_20160213_17_24_12_Pro WP_20160213_17_24_23_Pro

WP_20160213_17_24_33_Pro WP_20160213_17_24_46_Pro

WP_20160213_17_25_30_Pro WP_20160213_17_25_19_Pro

I disassembled the contact housing:

WP_20160213_17_29_57_Pro WP_20160213_17_30_05_Pro 

And here is the faulty spring.

WP_20160213_17_30_18_Pro

Now I have to find a similar spring from any other camera.

…………………………………………………………………………………………………………….

And here there are: the 7d Mk2 has the same pins!

WP_20160214_21_41_01_Pro  WP_20160214_21_41_24_Pro

The left is from the 70d, the right one from the 7d2.

 

I am very curious, which will be the next patient – as I have a few springs on the shelf…

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About canonrepair

Ruzsa János. Amatőr fotós, Canon DSLR váz. Amateur photographer. Canon DSLR user.
This entry was posted in 70d, Canon camera, EF lens, EF-S lens. Bookmark the permalink.

2 Responses to Canon EOS – no communication with SOME lenses (70d)

  1. The Gray Man says:

    Reallly interesting to see my camera stripped down. No way I’d have the guts to do that though.

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