Service manual

PROCESS CONTROL

SM 6-13 G130/G131

Detailed

Descriptions

Step 6: ID Sensor Highlight Pattern Generation

The machine makes a 10-grade pattern on the transfer belt for each toner color.

The pattern has 10 squares. Each of the squares is 12 mm x 15 mm, and is a dot-

pattern squares (not solid-color squares like in the process of step 2). They are

made using constant bias and charge roller voltages selected from one of the types

mentioned above. The various grades are made by changing the LD power.

Step 7: Sensor Pattern Density Detection

The ID sensor detects the densities of the 10 grade-pattern squares for each color.

This data goes to memory.

Step 8: VL (LD Power) Selection

The machine determines the relationship

between the amount of toner on the transfer

belt and the laser power for each of the 10

grades. Then the machine selects the laser

power to get the target M/A.

Left

Transfer belt

12 mm

15 mm

G130D509.WMF

Target

M/A

L LD Power

G130D510.WMF