Sharp AR-F15 Service Manual page 112

CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
2. A3/LD Paper Path (3 sheets)
No.1 paper sensor
PI18S
No.1 paper deflecting
solenoid
No.2 paper sensor
PI19S
No.2 paper deflecting
solenoid
No.3 paper sensor
PI20S
Entry of First sheet
3-18
Passage of paper
OFF
SL1S
Non-passage of paper
OFF
SL2S
Non-passage of paper
PI18S
PI19S
PI20S
Entry of Second sheet
Figure 3-303
Top edge
PI18S
PI19S
PI20S
Entry of Third sheet