Automatic Line Position Adjustment - Ricoh G190 Service Manual

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Laser Exposure

6.4.5 AUTOMATIC LINE POSITION ADJUSTMENT

YY, KK, CC, MM: Spaces between two lines of the same color

KY, KC, KM: Spaces between a black line and a color line

During automatic line position adjustment, the line patterns above are made eight times on

the transfer belt. The spaces between the lines (YY, KK, CC, MM, KY, KC, KM) are

measured by the left, center, and right ID sensors. The controller reads the average of the

spaces, and adjusts the following items:

Sub scan line position for YCM

Main scan line position for KYCM

Magnification ratio for KYCM

Skew for YCM (see the note below)

In this procedure, only the skew for YCM is measured. If you want to adjust it, do

the main skew adjustment procedure. (See 'Replacements and Adjustments –

Laser Optics – LD Unit')

The transfer-belt-cleaning unit cleans the transfer belt after the patterns are measured.

Summary of Each Adjustment

Sub scan line position for YCM