Canon PC-921 copy machine error message "P"

1- might be the scanning rail -- if you can open and lube LIGHTLY slide scanner back and forth ( w power off)
2- caould be Drum, some make a whistling/ hollow sound

Meaning of error code E1
The motor sensor or sensors, the DC controller on the main board DC controller.

I can not give solution to your problem, because possibility of damage main board.
I suggest you contact Canon Customer Support (e-mail, telephone, or repair contacts).

the copier need to be clean remove the document glass and clean the mirrors, the lens, very well with a soft cloth or tissue.

921 Fuser Error indicates that the fuser unit failed to reach the standby temperature. Leave the printer off for at least 10-15 seconds before turning it back on. This gives the printer's engine board a chance to reset. Make sure printer is plugged in straight to the wall, bypass any surge device or power strips as this can cause a low amperage problem in your printer which can trigger a false fuser error. If this does not help, you'll probably need service on the machine since it deals with the LVPS, the fuser and the system board.

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.

See if canon sell a Roller PM kit and replace the rollers.  you could try cleaning them with a lint free cloth and some fresh water.

Here's some info:

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.

It has a fuser error, needs new fuser, will not just reset when error is present.

The fuser is the hot bit that the paer goes threw to bond the image on the paper, yours has a blown heat lamp or a faulty temp sensor (thermister)

This area is not for playing in cause it is a electrical and fire hazard, just have new fuser fitted and error will be gone.

if the image on one side is not clear it means that : 1) the toner cartridge neds to be replaced or 2) The copier needs servicing by a qualified Tech