Canon W2200 Service Manual page 55

W2200
1.4 Detection Functions
1.4.1 Detection by sensors
The following sensors detect the printer's condition.
1) Tank cover sensor
2) Cover sensor
3) Paper-end sensor
4) Carriage encoder
5) LF encoder
6) Head temperature sensor
1.4.2 Detection by others
The following items are detected other than by sensors.
1) Presence of head
2) Presence of ink tank
3) Waste ink amount
4) Ink remaining amount
5) Media size
*1: Pin electrode method
By measuring the voltage that is necessary to pass the constant current to 2 pins
inserted inside the ink tank, the presence of ink can be distinguished.
Open/close of the ink tank cover
Open/close of the upper cover
Presence of paper
Carriage position
Rotation position of LF shaft
Head temperature
It is detected by checking whether the EEPROM information
on the head PCB can be read-out or not.
It is detected by checking whether the EEPROM information
on the ink tank can be read-out or not.
It is detected by storing the dot count value in the main
EEPROM and checking whether the waste ink absorber
capacity has exceeded or not.
It is detected by checking whether the ink capacity has
exceeded or not when counted by both Pin electrode method*1
and dot counter. If the ink amount become less and does not
contact the pins, remaining ink amount will be detected only
by the dot counter.
It is detected by aligning the end guide in the cassette to the
applicable media position. Detectable media sizes are
A4/A3/B4/Letter/Ledger/A3+/A3++.
3-3
Part 3 Technical Reference