NEC Super Script 4400 Maintenance Manual page 233

Color laser printer
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11. Vertical Staggering Image - Printed image staggers in the vertical direction.
Main Causes
1.
The printer was bumped or was vibrating during the print process.
2.
Failure of the optical unit: Vibration from the rotation of scanner motor.
Countermeasures
1.
Avoid shock or vibration of the printer.
2.
Installation location should be appropriate: No concern about shock or vibration.
3.
3. Replace the optical unit with a new unit. (See Chapter 7)
224
SuperScript 4400 — Maintenance Guide
Interlock
Optical Unit
Holes
Cover C
Front Cover Unit

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