The photo-reflection-type multi sensor is composed of four LEDs (red, blue, green and infrared) and two light-sensitive sensors. It detects the leading edge, skewing,

and width of media and is used for adjustment of the registration, head height, and color calibration.

During head adjustment, the light reflected by the infrared LED and green LED is detected by two light-sensitive sensors to calculate the head height from the

difference between the measurements.

When color calibration is executed, a color chart printed is read with three-color LED (red, blue, green), so color correction is implemented on the basis of the

readings.

Ink mist adhering to the sensor could deliver incorrect measurement readings when color calibration is executed. If the ink dot count exceeds a tolerance, the service

error (E194-4034) would occur. If it does, execute service mode: SERVICE MODE > ADJUST > GAP CALIB. after the multisensor has been replaced to clear

the dot count.

- Service mode: After SERVICE MODE > ADJUST > GAP CALIB. has been carried out, pass paper to make sure that it is detected properly.

- In executing Calibration concurrently with the main menu choice Auto Head Adj. or Manual Head Adj., Auto Head Adj. or Manual Head Adj. first for the sake

of higher color calibration accuracy.

2-46

LED(blue)

LED(green)

Infrared sensor

F-2-38

LED(red)

Infrared LED

Media

Platen

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