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.

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

Add Comment

Peel off rubber grips
  • Peel off rubber grips

Add Comment

  • take off front piece

Add Comment

  • take off rear

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

Add Comment

  • Take off top cover

Add Comment

  • take off bottom plate

  • disconnect and remove bottom board

Add Comment

  • remove CMOS assembly

Add Comment

  • remove metal back

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

Add Comment


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

Add Comment

View Statistics:

Past 24 Hours: 4

Past 7 Days: 12

Past 30 Days: 67

All Time: 4,074