Service manual

PROCESS CONTROL

G130/G131 6-14 SM

6.2.4 VREF COMPENSATION DURING A PRINT JOB

Highlight Pattern

The M/A target (mass-per-area target) is the target toner amount in a given area.

To adjust the toner amount, a highlight pattern [B] is created on the transfer. The

interval of creating the highlight pattern depends on the setting specified with SP3-

923 and 3-924.

For color jobs, the order of pattern generation is K → Y → M → C → K → Y → M

→ C. The highlight pattern is made about 2 cm after the trailing edge of the paper

[A].

Adjustment Process

The machine generates a highlight pattern (one grade) of a specified density. The

center ID sensor checks the density. Then the machine adjusts V

REF

by comparing

the reading with the target of each color (SP3-905-1 to 4). The machine adjusts

CNT

when this adjustment is not sufficient.

Left

Transfer belt

G130D511.WMF

[A]

[B]