Service Guide 49
Multi-purpose tray feed jams
1. Is the paper in good condition and appropriate for a laser printer?
2. Is the printer printing within its environmental specifications?
3. Do not overload the multi-purpose tray; otherwise jams will occur. Check the
position of the media thickness selector at the paper feeder (inside the left door).
4. Clean or replace the multi-purpose feed pick roller.
5. Is the picked media properly interrupting the aligning sensor?
6. Is the multi-purpose feed sensor empty flag properly interrupting the multi-
purpose pick sensor?
7. Check the wiring harness between the multi-purpose sensor circuit board and
the paper feeder board (connector CN607). Ensure that the wiring harness is not
damaged.
8. Check the wiring harness leading from the paper feeder to the engine control
board (connector CN20).
9. Replace the paper feeder circuit board.
10. Replace the engine control board.
Jams in the duplex unit
1. Is the duplex unit correctly installed?
2. Clean the rollers inside the auto-duplex unit.
3. Inspect the duplex unit for foreign objects such as a shard of paper.
4. Does the duplex unit’s clutch operate correctly? Refer to “Phaser 740 service
tests” on page 77 or “Phaser 750 service tests” on page 80.
5. Inspect the duplex unit’s electrical connector for damage.
6. Replace the duplex unit.
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General