Hi bryanmonger.
Please note that Canon does not provide service manuals or instructions on disassembling the machine. If you are hearing a grinding noise in the machine, there could be a few causes, such as, the type of toner cartridges you are using, a loose or broken part in the machine, or an issue with one of the assemblies.
We recommend that you contact us at 1-800-OK-CANON (1-800-652-2666) for further assistance. While I understand that the forum may be the preferred method of communication, the real time feedback of a live technical support call would be very beneficial in this case.
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