Overview; Id Sensor Calibration; Toner Mass Amount Control - Ricoh G108 Service Manual

TONER DENSITY (MASS AMOUNT) CONTROL
6.2 TONER DENSITY (MASS AMOUNT) CONTROL

6.2.1 OVERVIEW

This machine automatically controls the toner density (mass quantity) on the
transfer belt. This process is referred to as TMA Control (Toner Mass Amount
Control). The control procedure has four phases:

1. ID sensor calibration

2. Test pattern processing
3. Reference equation processing
4. Development bias adjustment
NOTE: The machine does not check the toner density on the paper.
6.2.2 ID SENSOR CALIBRATION
[A]
1. The cyan development unit is used to
expose (develop) a rectangular "pattern"
image [B].
2. This cyan pattern on the transfer belt [A]
reflects the light from the ID sensor [C].
3. The BCU examines the signal level from
this sensor, and properly calibrates the
ID sensor.
G108
[C]
6-8
[B]
G108D942.WMF
G108D929.WMF
SM