Gestetner B147, Service Manual

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PROCESS CONTROL
B147/B149/B190 6-10 SM
6.2.3 PROCESS CONTROL SELF CHECK PROCEDURE
Step 1: V
SG
Adjustment
This machine uses three ID sensors (direct reflection type). They are located at the
front, center, and rear of the transfer unit. Only the center ID sensor is used for
process control. The ID sensor checks the bare transfer belt's reflectivity and the
machine calibrates the ID sensor until its output (known as V
SG
) is as follows.
•
V
SG
= 4.0
±
0.5 Volts
This calibration compensates for the transfer belt's condition and the ID sensor
condition, such as dirt on the surface of the belt or ID sensor.
Sensor pattern density detection
V
SG
adjustment
ID sensor solid pattern generation
Sensor pattern density detection
Toner amount calculation
V
D
, V
B
, V
L
selection and V
REF
adjustment
ID sensor highlight pattern generation
Step 1
V
L
(LD power) selection
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7
Step 8
Default: off
Start
End
B146D501.WMF