Paper size Paper-feeder cassette media-size switch settings
Top switch Center switch Bottom switch
A5 ON OFF OFF
B5 OFF ON ON
Executive ON OFF ON
Letter OFF ON OFF
A4 OFF OFF ON
Legal ON ON OFF
No cassette OFF OFF OFF
The paper-feeder cassette media size switch (SW1) detects whether the paper-feeder cassette is
installed correctly. The paper-feeder driver determines if a cassette is absent when all three switches
are turned off. The paper-feeder driver determines a cassette presence when one of the switches is
turned on.
Paper-feeder cassette lift operation
The cassette lift operation keeps the stack surface of paper at a specified height to maintain stable media
feeding. The paper-feeder driver controls the paper-feeder lifter motor (M2) and monitors the paper-
feeder media stack surface sensors (SR1, SR2) to adjust the stack height when the printer is turned on,
when the printer recovers from sleep mode, when the paper-feeder cassette is installed or as needed
during a print operation. The paper feeder has two paper-feeder media-stack surface sensors. The
paper-feeder media stack surface sensor 1 detects the stack height during a print operation. The paper-
feeder media-stack surface sensor 2 detects the stack height when the printer is turned on, when the
158 Chapter 5 Theory of operation ENWW
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