No Paper Feeder Installed; No Imaging Unit Installed; Jams; Paper Mis-Picks At The Paper Tray - Tektronix Z740/N - Phaser 740 Color Laser Printer Service Manual

2.
Ensure that the wiring harness leading from the paper feeder to the engine
control board is properly installed in connector CN20. Check the wiring
harness for defects.
3.
Replace the engine control board.

No imaging unit installed

1.
Ensure that the imaging unit is properly installed and locked in place.
2. Check the main charge grid boss on the rear of the charger to ensure it is not
broken. When the imaging unit is installed, the boss pushes a flag on the
charger sensor board. Replace the charger or imaging unit if it is broken.
3.
Test the sensor using the service tests described in "Service tests" on
page 57.
4.
Check the high-voltage terminal connectors for the imaging unit to ensure
that they are not damaged.

Jams

Paper mis-picks at the paper tray

1.
Is the paper in good condition and appropriate for a laser printer?
2.
Is the printer printing within its environmental specifications?
3.
Is the pick-up roller dirty? If so, clean it and try printing again. You can
also slide off the "treads" from the pick rollers and reverse them to present a
fresh pick-up roller edge to the paper.
4.
Does the pick roller rotate? Mark the end of the pick roller shaft. Open the
front door and defeat the door open interlock to see the shaft turn.
If the roller does not rotate, does the paper feed motor run? Check the
motor's wiring harness and connection (CN20) to the engine control board.
Check the gear train for broken teeth and proper installation.
Replace the paper feed motor.
Replace the engine driver board.
If the pick roller rotates out of position with each pick, its clutch is worn.
Replace the paper feeder.
Service Guide
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