Toshiba e-STUDIO4500c Service Manual page 804

PROCESS CONTROL
2. Page interval process control (Vsp detection between pages)
This function operates only when SP3042 001 (Vtref correction) is set to "ON"
(default). The Vsp ID sensor pattern is created between the page images on the
ITB (Default: Every 10 pages). This interval can be adjusted with SP3171.
Image Area
Belt Rotation
[A]: ID Sensor – K
[B]: ID Sensor – Y, C, M
See Section 6.12.9 for the actual locations of the ID sensors.
The toner M/A (Mass per Area) is calculated from this sensor pattern after every
10th page:
Target M/A K Toner
Y, M, C Toner
Toner supply is based on Vt - Vtref
If the pattern is too dark (too much toner):
Vtref is increased
If the pattern is too light (not enough toner):
Vtref is reduced
Also, the TD sensor detection is done for every page:
If Vt < Vtref, the toner supply amount is lowered.
If Vt > Vtref, the toner supply amount is raised.
Image Area
Uses the setting of SP3161 001.
Uses the settings of SP3531 002 to 004
Toner supply amount decreases
Toner supply amount increases
6-88
August 2006
Rear
Image Area
Front
B132D919.WMF
[A]
[B]