Epson AcuLaser C1900 Service Manual page 104

EPSON AcuLaser C1900/AcuLaser C900
DETECTION OF TONER CARTRIDGE
The presence/absence of a toner cartridge is detected with the toner cartridge detection
sensor (PC8) and reflector.
Table 2-9. Detection Method
Toner cartridge absent
Toner cartridge present
Reflector
Figure 2-15. Detection of Toner Cartridge
Operating Principles
Reflected Light
Absent
Present
Reflector
VCC
CPU
GND
PC8
Description of Mechanisms
DETECTION OF NEW TONER CARTRIDGE
1. Set a new toner cartridge.
2. Close the front door. Turn on the main switch.
3. Rotate the Toner Cartridge Rack and stop it where the black toner cartridge is located
at the stop position for development.
4. The toner cartridge detection sensor detects the "Set" / "Unset" of a toner cartridge.
5. Since the new toner cartridge has the reflector hidden, the reflected light is absent and
the toner cartridge detection sensor detects "Unset".
6. The toner cartridge detected as "Unset" is stopped at the development position and the
development roller is rotated.
7. As a result of rotation of the development roller, the reflector is pushed out and the
toner cartridge detection sensor (PC8) detects "Set".
8. Each of the other toner cartridges is stopped at the stop position for development and if
it is a new one, the steps 4 to 7 above are followed. ((For each color cartridge))
By operation above, the toner cartridge is detected to be a new one, if so.
Toner cartridge "Unset"
Figure 2-16. Detection of New Toner Cartridge
Revision B
Reflector
Toner cartridge "Set"
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