Service manual

PROCESS CONTROL

G130/G131 6-10 SM

6.2.3 PROCESS CONTROL SELF CHECK PROCEDURE

Step 1: VSG Adjustment

This machine uses three ID sensors (direct reflection type). They are located at the

front, center, and rear of the transfer unit. Only the center ID sensor is used for

process control. The ID sensor checks the bare transfer belt’s reflectivity. Then the

machine calibrates the ID sensor until its output (known as VSG) is as follows.

• VSG = 4.0 ± 0.5 Volts

This calibration compensates for the transfer belt’s condition and the ID sensor

condition, for example, dirt on the surface of the belt or ID sensor.

Sensor pattern density detection

adjustment

ID sensor solid pattern generation

Sensor pattern density detection

Toner amount calculation

, V

selection and V

REF

adjustment

ID sensor highlight pattern generation

Step 1

(LD power) selection

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Step 8

Default: off

Start

End

G130D506.WMF