Canon ImageRunner iR8500 Series Service Manual page 369

Toner sensor (TS1; inside the hopper)
Purpose: To keep the toner inside the developing assembly to a
specific level.
Operation: If the absence of toner is detected, the magnet roller is
rotated to supply the developing assembly with toner.
The hopper supplies the developing assembly with toner as follows:
Toner cartridge
Purpose: To keep the toner inside the
hopper to a specific level.
Operation: If the absence of toner is
detected, the toner feeding screw inside
the toner cartridge is rotated to supply the
hopper with toner.
Toner sensor
(TS3; inside the developing assembly)
J504B
When the absence of toner is detected, '0'.
1
5V
7
TS1
8
0V
9
5V
10
TS2
11
0V
12
5V
15
TS3
16
0V
17
19
Toner feeding screw
Toner lower limit sensor
(TS2; inside the hopper)
Purpose: To detect the absence of toner
inside the hopper.
Operation: If the absence of toner is
Magnet roller
detected, the ongoing operation is
stopped, and the Add Toner message will
be indicated.
F-8-38
F-8-39
Chapter 8
TS1
8-29