Canon iPF6100 Service Manual page 106

Chapter 2
cleaning operation accompanied by suction is performed only at the left cap.)
f) Carriage height adjustment
When the lift motor is driven to rotate the carriage height changing cams installed at both ends of the shaft, the
height of the carriage shaft is varied to change the spacing between the face of the printheads and the paper.
The printhead height is detected by the multisensor installed in the lower left part of the carriage.
g) Multi sensor unit
The multi sensor mounted at the lower left of the carriage is composed of four LEDs (red, blue, green, infrared)
and two light-sensitive elements which are used to detect the leading edge, width, and skewing of paper and
adjust the color calibration and head height.
The multi sensor reference plate is provided with a white plate. By measuring the quantity of the reflected light
from the white plate, the reference value for gap measurement is computed.
(Service mode: SERVICE MODE> ADJUST> GAP CALIB.)
h) Shaft cleaner units
The shaft cleaners mounted at the left and right of the carriage are used to clean the carriage and apply oil to the
shaft.
i) Internal temperature detection
A themistor for measuring the internal temperature is mounted on the carriage PCB on the rear of the head
holder.
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