NEC Super Script 4400 Maintenance Manual page 225

Color laser printer
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3. Jitter - Uneven optical density appears periodically in the horizontal direction of printed image.
Main Causes
1.
Failure of the main motor.
a. Irregular rotation of the drive motor.
b. Failure of the gears.
c. Variation of Photoconductor belt running speed due to above reasons.
d. Too much rotational load on the Photoconductor belt.
Countermeasures
1.
Replace the Photoconductor belt drive motor (BM) with a new motor. (See Chapter 7)
2.
Replace the Photoconductor belt module with a new cartridge. (See Chapter 6)
216
SuperScript 4400 — Maintenance Guide

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