Xerox phaser 7400DN right side "A" door adjar

have you run the maintenance ie. clean printer head and print a test page this will usually give you an indication as to what could be faulty .

My copier is not able to operate because of Dept ID and password. So, can you suggest ways to remove the Dept ID and Password?

No this is phisically impossible, try a larger sheet of paper and cut it

The printer trays accommodate most sizes and types of paper, transparencies, or other
specialty media. Follow these guidelines when loading paper and media in the trays:
- Envelopes, labels, and glossy paper can be printed from Tray 1 (MPT) only.
- Transparencies and custom size paper can be printed from Tray 1 (MPT) and Tray 2.
- Fan paper, transparencies, and labels prior to loading them in the tray.
- Use only paper envelopes. All envelopes should be printed single-sided only. Some
wrinkling and embossing may occur when printing envelopes.
- Do not overload the paper trays.
- Adjust the paper guides to fit the paper size.
- If excessive jams occur, use paper or other media from a new package.

Hello,
try to clean paper feeding rollers and chek fuser paper sensor, maybe paper comming too late...chek this just to be sure all its OK whit paper path and fuser.
...or replace fuser module!
Good luck!

941 CM Toner Supply Failure. Toner Sensor Failure with Cyan or Magenta Toner

www.support.xerox.com -phaser 7400- support -fault code-941 says cyan or magenta toner failure, but the solution says to
1. remove & reinsert the cyan or magenta imaging units.
2. replace imaging units .
check out the site to see if helpful

Check the Xerox.com website and follow the links for assistance.
Good luck.

This is caused by the flaps that cover the optics when you open the top cover. As you close the cover the 4 flaps are supposed to open,if they do not all open you will get that color or colors as a solid back ground. there is a gear on the left side that is cracks and doesn't open the flaps correctly.

Unfortunatly you have to have the memory stick from Xerox.