Canon FAX-L1000 - Manual (Page 448)

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FAX-L1000 Chapter 5: Appendix
Figure 5-36 Adjustment of Envelope Multiple Feed Sensor
Screw
Envelope multiple feed sensor
Connecting to the multiple feed sensor connecter.
Printer driver tester (RY9-0124)
Sensor Test LED
Connecting to the printer's connector for the envelope feeder.
Thickness gauge (RY9-0122)