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24 June 1994
6.2 ID SENSOR FUNCTION
6.2.1 Detect Supply Mode
ID Sensor
B
C
A
K
E
C
ID Sensor Output
R
A
ID Sensor LED
Vsg 4V
Vsp
The image density sensor checks the density of the sensor pattern image
once every 10 copy cycles. The CPU receives two voltage values directly
from the sensor: the value for the bare drum (Vsg) and the value for the
sensor pattern (Vsp). These two values are then compared to determine
whether more toner should be added.
Vsp
x 100 <10.3 ..... No toner is added. (High density)
1.
Vsg
Vsp
x 100 ≥10.3 ..... Toner is added. (Low density)
2.
Vsg
When the image density is too low, the CPU activates the toner supply clutch
to add toner over the next 10 copy cycles. The amount of toner added
depends on the value of Vsp, the selected toner supply ratio (SP31), and ID
sensor data. (See page 2-37 for more information.)
When SP35 is set to "1" (factory setting = "0"), the CPU changes the interval
of the toner density detection from every 10 copies to every 5 copies.
TONER DENSITY DETECTION AND TONER SUPPLY
Main Board
+5V (V
CN112-2
TP 110
(PSE)
CN112-1
VR102
CN112-3
2-33
+24V (V
)
A
)
B
CN110-2
CPU
CN110-1
Low Density
High Density
(0.103 Vsg ≈ 0.41 V)
High Density
Toner
Supply
Clutch
MSC1
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