Theory of Operation Ver. 8.0 Jun. 2008
17. Bypass section
11
7
Composition/Operation
17.3 Operation
17.3.1
Bypass paper take-up control
• Bypass paper feed starts after the bypass tray up down motor lifts up paper to the take-
up position.
• Paper is fed with the bypass paper feed motor.
• When paper reaches the tray1 vertical transport sensor, if the interval between the paper
and the preceding paper is short, the tray1 vertical transport motor reduces its speed (in
the case of transport speed 216 mm/s or more) or stops (in the case of transport speed
132 mm/s or more) to adjust the paper interval to the proper one.
17.3.2
Paper empty detection
• Paper empty is detected by the bypass paper empty sensor.
• Paper empty is detected both at the standby and the paper feed positions.
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Bypass tray up
down motor (M28)
Normal rotation
Inverse rotation
Bypass paper limit sensor (PS35)
Bypass paper feed motor (M27)
Tray1 vertical transport motor (M5)
Tray1 vertical transport sensor (PS4)
Start key ON
Paper feed
position
Paper feed finish
Timing motor
ON
Plain paper: OHP detection sensor ON
Thick paper: Timing roller sensor ON
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When there is no paper
When there is paper
Bypass paper empty sensor (PS34)
Y107522-3 Theory of Operation
