Sony UP-D2600S Service Manual page 119

The sensor names and purpose are as follows.
No Name
1 Head position sensor
2 Paper jamming sensor
3 Platen position sensor
4 Platen cover sensor
5 Paper edge sensor
6 Paper eject timing sensor Transparency Photointerrupter
7 Paper supply FG sensor Transparency Photointerrupter
8 Tray position sensor
9 Tray size sensor
10 Paper existence sensor
11 Ribbon FG sensor
12 Bar code sensor
13 Ribbon code sensor
14 Ribbon cartridge sensor
UP-D2600/V1(E)
Type
Transparency x2 Photointerrupter
Reflection Photointerrupter
Transparency Photointerrupter
Microswitch
Transparency Photointerrupter with arm
Transparency x2 Photointerrupter
Transparency Photointerrupter with arm
Transparency Arm and photointerrupter
Reflection Photointerrupter
Reflection Photointerrupter
Transparency x2 LED and phototransistor
Microswitch Push catch integrated type
Table 5-1.
Fig. 5-3.
Purpose
Detection of head position
Detection of paper jamming
Detection of platen home position
Judgment of cover opening and closing
Detection of paper edge
Detection of paper eject miss
Detection of paper sending quantity
Detection of tray motor cam position
Detection of tray size
Judgement of paper existence
Judgment of ribbon rewinding
Judgment of ribbon cartridge type
Detection of cueing of each ribbon color
Judgement of ribbon cartridge existence
5-3