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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.
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Get the Canon 40D Service Repair Manual
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Have a clean and organized workspace. I labelled plastic trays by step number and put all items for each step in a separate tray.
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Watch a couple Youtube videos on this process
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take off rear
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connectors disconnect by flipping black/brown tab up and sliding plastic tab out.
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take off bottom plate
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disconnect and remove bottom board
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remove metal back
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remove and replace shutter assembly, transfering components that aren't on the new one
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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