Toshiba MR-3018 service manual Original Size Detection, Original tray width sensor

3.2Original Size Detection

The original tray width sensor, original length detection sensor, and original width detection sensors-1 and -2 work in combination to detect the size of originals.

Original width detection sensor-2 Original tray width sensor

Original width detection sensor-1

Original length detection sensor

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Fig.3-5

3.2.1Outline

When an original is placed on the original tray, the width of the original is detected by the positions of the original width guides. Then the original width sensors -1 and -2 and the original length detection sensor detect the size of the original being transported. Based on the detection result of these sensors, the size of the original is finally determined.

3.2.2Original tray width sensor

The original tray width sensor detects the width of the original placed on the original tray.

This sensor consists of a leaf spring and 4 contacting points (= 4 harnesses). When the original width guides are moved, a protruded part located under the guides pushes the leaf spring, and the leaf spring thus contacts the harnesses. The gap between these guides is detected by this contact.

A terminal connected with the black harness is for grounding (= common). When the leaf spring con- tacts with each harness of gray, yellow and orange, each terminal connected with these harnesses gen- erates a signal at a low level.

The combination of these contact (= low level) and release (= high level) can determine the width of the original.

Sizes detectable in combination of these contact and release are as follows:

TWIDTH2	TWIDTH1	TWIDTH0	Original width size
(Orange)	(Yellow)	(Gray)
H	H	H	LD / LT
H	H	L	-
H	L	H	ST-R
L	H	H	LD / LT
L	H	L	-
L	L	H	8.5x8.5 / LT-R / KLG / 13”LG
L	L	L	COMPUTER
	H (= high level): Release L (= low level): Contact
June 2005 © TOSHIBA TEC			MR-3018 DESCRIPTION OF OPERATIONS

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