Tektronix Phaser 740, Service Manual

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Phaser 740 and 750 Color Printers
Jams
Wrong media
1.
Ensure the correct media type is loaded in the correct tray.
2.
Test the media sensors
3.
Replace the paper feeder.
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.
5. If the pick roller does rotate, is the pick roller correctly installed (flat side of the
cam-shaped pick rollers face down prior to picking a sheet of paper)?
■
Does the pick solenoid work properly? It must energize for the pick roller to
be engaged and rotate. If it doesn’t, replace the paper feed circuit board.
■
Replace the paper feeder.
Paper jams midway in the paper feeder
1.
Ensure that the pick-up rollers are clean.
2.
Check the left side door for burrs or foreign obstructions that could block the
movement of a sheet of paper.
3.
Clean the intermediate rollers (pinch roller and drive roller).
4.
Check the pinch intermediate roller mounted on the inside of the left door for
even spring tension at each end of the roller. The spring tension should measure
about 65 grams when the roller end is in the middle of its travel in its slot.
5. Does the pick-up roller clutch work properly?