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Chapter 2

2-37

Multi sensor

The photo-reflection-type multi sensor is composed of four LEDs and four 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 GAP LED is detected by two light-sensitive sensors (GAP-Far, GAP-Near) )to calculate the head height from the

difference between the measurements.

When color calibration is executed, the light reflected from the printed color chart by the the three-colors LED (red, blue, green) is detected by the light-sensitive

sensor (COLOR-SNS), so the color correction is implemented on the basis of the readings.

During media detection, the light reflected by the diffuse reflection LED and regular reflection LED and the three-colors LED (red, blue, green) are detected by the

light-sensitive sensors (EDGE-SNS, COLOR-SNS).

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.

F-2-38

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

- If performing the calibration in parallel with the "Head Posi Adj." of the main menu, perform the "Head Posi Adj." first for the sake of higher color calibration

accuracy.

GAP LED

Media detection

Head height detection

Color and media detection

Platen

Media

Light-sensitive sensor

(COLOR-SNS)

Light-sensitive sensor

(EDGE-SNS)

Light-sensitive sensor