48 Phaser 740 and 750 Color Printers
Fuser jams
1. Is the paper in good condition and appropriate for a laser printer?
2. Is the printer printing within its environmental specifications?
3. Is this a duplex print with heavy printing (lots of toner coverage) on the first-
printed side? Print the light-printing side first.
4. Is the heat shield plate at the entrance of the fuser loose and obstructing the
paper path?
5. Inspect the fuser’s gear train leading to the paper feed motor. Does it rotate
properly? Do any of the gears show broken teeth?
6. Does the fuser exit sensor flag properly actuate its sensor?
7. Inspect the wiring harnesses leading from the cartridge sensor/eject unit to
CN21 of the engine control board.
8. Inspect the fuser roll. If it is empty, replace the fuser roll.
9. Observe if the exit rollers rotate during the print process. If they do not, reinstall
the fuser to ensure its gear train (which also drives the exit roller) properly
connects to the paper feed motor.
10. Replace the fuser.
11. Replace the engine control board.
Eject jams
1. Is the paper in good condition and appropriate for a laser printer? Is the paper
curling?
2. Is the printer printing within its environmental specifications?
3. Is the jam caused by a heavy, stiff paper being printed in face-down mode? In
such cases, face-up mode or a lighter grade of paper should be used.
4. Is the paper excessively curved after passing through the fuser that the reverser
(eject unit) can’t flip the paper? Try flipping the paper over in the tray.
5. Clean all the eject rollers.
6. Inspect the interior of the printer reverser of the toner cartridge selector/paper
eject unit. Ensure that the metal fingers inside the reverser are not bent or
interfere with paper movement.
7. Does the paper exit sensor flag properly actuate its sensor?
8. Inspect the wiring harness leading from the cartridge sensor/eject unit to
CN308 of the engine driver board.
9. Replace the cartridge selector/eject unit.
10. Replace the engine control board.
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General