Specifications

AL-1551 EXTERNAL VIEWS AND INTERNAL STRUCTURES 4-4

5. Sensors and switches

No. Name Signal Type Function Output

1 Mirror home position sensor MHPS Transmission sensor Mirror (scanner unit) home position

detection

"H" at home position

2 POD sensor POD Transmission sensor Paper exit detection "H" at paper pass

3 PPD2 sensor PPD2 Transmission sensor Paper transport detection 2 "L" at paper pass

4 Cassette detection switch CED1 Microswitch Cassette installation detection "H" at cassette insertion

5 Manual feed detection switch MFD Transmission sensor Manual feed paper detection

(single only)

"L" at paper detection

6 PPD1 sensor PPD1 Transmission sensor Paper transport detection 1 "L" at paper pass

7 Door switch DSW Micro switch Door open/close detection

(safety switch for 5V)

1 or 0V of 5V at door open

8 Door switch DSW Micro switch Door open/close detection

(safety switch for 24V)

1 or 0V of 24V at door open

9 Drum reset switch DRST Micro switch New drum detection switch Instantaneously "H" at insertion of new

drum

10 SPF sensor SPID/

SD SW

Transmission sensor Paper entry detection

Cover open/close detection

"L" at paper pass

11 SPPD sensor SPPD Transmission sensor Paper transport detection "L" at paper pass

12 SDOD sensor SDOD Transmission sensor SPF open/close detection Book sensor "L" at paper pass

13 2nd cassette DSW Micro switch 2nd cassette door open detection 1 or 0V of 5V at door open

14 PPD3 sensor PPD3 Transmission sensor Paper transport detection 3 "L" at paper pass