An Error 99 is an non specific error which means that camera doesn't know or have a code for the problem. In my case the shutter assembly needed replacing. This was a fairly involved process for a beginner such as myself.

This is not a comprehensive guide but should be used in conjunction with the Canon Service Manual and youtube videos. I hope that some of the pictures I took along the way might help you identify or remember how each step works.


No parts required.

  1. Get the Canon 40D Service Repair Manual
    • Get the Canon 40D Service Repair Manual

    • Have a clean and organized workspace. I labelled plastic trays by step number and put all items for each step in a separate tray.

    • Watch a couple Youtube videos on this process

  2. Peel off rubber grips
    • Peel off rubber grips

    • take off front piece

    • take off rear

    • connectors disconnect by flipping black/brown tab up and sliding plastic tab out.

    • Take off top cover

    • take off bottom plate

    • disconnect and remove bottom board

    • remove CMOS assembly

    • remove metal back

    • remove and replace shutter assembly, transfering components that aren't on the new one


To reassemble your device, follow these instructions in reverse order.

5 other people completed this guide.

One Comment

how do you replace the bridge (male portion on camera) other than putting the card in a card reader

wareibevictoriap - Reply

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