18-3.Color Shift Correction; Outline Of Color Shift Detection - Minolta CF1501 Service Manual

18-3. Color Shift Correction
• In a tandem engine provided with a separate image reproduction process for each of the
four different colors of toner, incorrect color registration, or color shift, is more likely to
occur due to positional deviations among different LED Units. Any misalignment among
different colors is automatically detected and corrected both in the main scanning and
sub-scanning directions.
Transfer Belt
PC Drum Y
LED Y
(1)

Outline of Color Shift Detection

• Patterns are produced in the main scanning and sub-scanning directions on the Transfer
Belt.
• The Registration Sensors read the patterns to allow color shift corrections to be made as
necessary.
Patterns for Main Scanning Direction
Tandem Engine
Y M
LED M LED C
Transfer Belt
Transfer Belt
M-69
2nd Image Transfer Roller
Paper
C Bk
LED Bk
Patterns for Sub-Scanning Direction
4004M012AA
Registration Sensor 1 and 2
(UN20, UN21)
4004M575AA
4004M013AA