Vref Compensation During A Print Job - Gestetner B147 Service Manual

PROCESS CONTROL

6.2.4 VREF COMPENSATION DURING A PRINT JOB

Left
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 belt at
the following times during each print job.
Job
Black-and-white printing
Color printing
For color jobs, the order of pattern generation is K → Y → M → C → K → Y → M
→ C.... The highlight pattern is created about 2 cm after the trailing edge of the
paper [A].
Adjustment Process
The machine generates a highlight pattern (just one grade) of a specified density.
The center ID sensor checks the density and the machine adjusts V
comparing the reading with the target of each color (SP3-905-1 to 4). When this
adjustment is not sufficient, the machine adjusts V
B147/B149/B190
Interval
After every four pages
After every one page
6-14
Transfer belt
B146D506.WMF
Color of highlight pattern
Black
One of four colors
too.
CNT
[A]
[B]
by
REF
SM