Tektronix Phaser 740, Service Manual

Page: 59 / 148

Service Guide
47
6. Try printing using a different paper tray.
7.
Transparency film. Do not use transparency film in the lower tray of the Lower
Tray Assembly.
Paper jams at the second bias transfer roller
1. Clean the intermediate rollers.
2. Is the transfer roller correctly installed?
3. Is the transfer roller moving up for image transfer when it should?
4. Does the paper jam sensor flag properly interrupt the sensor? Check the wiring
harness of the paper jam sensor leading to CN607 of the paper feeder board.
5. Does the drive intermediate roller rotate? If not, check the gear train driving the
gears for proper installation and for broken teeth.
6.
Check the left side door for burrs or foreign obstructions that could block the
movement of a sheet of paper.
7.
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.
8. Clean the aligning rollers.
9. Do the aligning rollers rotate during a paper pick? Determine if the aligning
roller clutch operates correctly.
10.
Check that the paper feeder wiring is properly installed and that the wiring
harnesses are not damaged.
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.