Canon Finisher-AB1 Service Manual page 275

Chapter 3
[1]Saddle pressing home position sensor signal
[2]Saddle pressing front sensor signal
[3]Saddle vertical path sensor signal
[4]Saddle stitcher detection signal
PS103: saddle small sensor
PS105: saddle vertical path sensor
PS110: saddle paper butting plate home position sensor
PS111: saddle pressing front sensor
PS113: saddle pressing home position sensor
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[5]Saddle inlet sensor signal
[6]Saddle small sensor signal
[7]Saddle paper butting plate home position sensor signal
[8] Saddle pressing positioning signal
PS121: saddle pressing positioning sensor
SU: saddle stitcher sensor (in saddle stitcher unit)