Fuser Jams - Tektronix Z740/N - Phaser 740 Color Laser Printer Service Manual

11.
Check the spring pressure at each end of the aligning rollers. Lifting each
end of the roller with a tension gauge should reveal a measurement of about
1 kg (2.2 lbs).
12.
Check the left side door for burrs or foreign obstructions that could block
the movement of a sheet of paper. Check for a paper scrap in the paper
guide.
13. Try printing using a different paper tray.

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.
Service Guide
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