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41388601TH Rev.2 39 /
CMYK
CMYK
Transfer
belt
ID
Transfer Belt
Color alignment sensor R
Color alignment sensor L
Cleaning blade
LED head
Belt running direction
Belt running direction
(Bottom View)
Cleaning blade
Color alignment sensors L and R
2.13 Color Misalignment Detection
Reflection-type optical sensors (Z71-PCB) are mounted at the right and left ends of the belt,
respectively, in front of the toner scraping (cleaning) blade which is at the back of the belt unit. The
color misalignment detection pattern is printed on the belt at the right and left ends each and, by
reading the patterns by the reflection-type optical sensors, the misalignment amounts are
measured with respect to Black to determine correction values. Then, the misalignment in main-
scanning, sub-scanning and slanting directions is corrected.
These operations are performed at power-on, at cover-close and every 400 pages.