Canon iPF800 Series Service Manual page 127

thereby varying the separation between the face of the printhead and the paper.
The printhead height is detected from the lift cam sensor within the carriage and the distance of rotation of the lift motor.
g) Multi sensor
The multi sensor attached to the lower left part of the carriage consists of four LEDs (red, blue, green, infrared) and two light-receiving sensors to detect the leading
edges and width of paper and skews in it, and to adjust its registration and head height.
The multi sensor reference has a white plate attached to it, so that a reference value can be calculated during carriage height measurement by measuring the intensity
of light reflected upon the white plate.
(Service mode: SERVICE MODE>ADJUST>GAP CALIB.)
h) Rail cleaner
The shaft cleaner located in the right side of the carriage helps keep the main rail clean.
i) Internal unit temperature sensor
One thermistor is installed on the head relay PCB on the back of the head holder to detect the internal unit temperature.
[10]
[2]
[3]
[4]
[5]
[9]
[11]
[1] Carriage relay PCB
[2] Head relay PCB
[3] Slant adjustment lever
[4] Printhead fixer lever sensor
[5] Multi sensor
[6] Shaft cleaner
[7] Lift cam
[8] Linear encoder
[1]
[8]
[12]
F-2-13
T-2-7
[9] Multi sensor reference plate
[10] BP maintenance jet tray
[11] HP maintenance jet tray
[12] Head management sensor
[13] Carriage HP sensor
[14] Lift cam sensor
[15] Lift motor
Chapter 2
[7]
[6]
[13] [14]
[14]
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