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Canon PC 921 copier does not offer automatic duplexing. It is possible to copy first side, then take the copy and feed it into the bypass (manual) feeder on the right side of copier with printed side facing down or placing in paper cassette printed side facing upward. Don't forget to change your original for second side.
Remove the paper tray and clean the feed rollers on the right side at top. I would use a cotton ball with rubbing alcohol on it. Make sure the rollers are dry before trying to copy again. Let me know your progress.
what you probably brushed over was the transfer roller(black and spongy?). first try running 20 or 30 blank copies through the machine. If that doesnt work take a dry paper towel and gently wipe and rotate that black roller. that should take care of the problem. If the roller needs replaced you should have a technician do it. You could break the machine beyond repair.
921 Fuser Error and 922 Fuser Error messages indicate that the fuser unit failed to reach the standby temperature.
If this is the first time you have seen the error, turn the printer off and on. Leave the printer off for at least 10 seconds before turning it back on. This gives the printer's engine board a chance to reset.
If this is an intermittent error, you may want to check how the printer is plugged in, even if it has worked on this surge device for months. Make sure the printer is plugged straight to the wall and not through a surge device or power strip. Power strips and uninterrupted power supplies can cause a low amperage problem in your printer which can trigger a false fuser error.
If this does not help or if this error appears every time the printer is powered on, you will probably need service on the machine.