Canon LBP 2460 - B/W Laser Printer, Service Manual

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E. Pick-up/Feed System
1. Outline
Presence of paper in the paper deck is detected by the tray paper-out sensor (PS33), and the
remaining amount of paper is detected by outputs from the paper-level sensing switch 1 (SW601)
and paper-level sensing switch 2 (SW602). The combination of the two paper-level sensing
switches is shown in table 2-10-1.
The size of the paper is detected by a combination of 4 paper-size sensing switches (SW701 -
704), which are shown table 2-10-2.
After receiving a pick-up command from the option controller the paper deck driver rotates
the pick-up motor (SMT31), and simultaneously turns the pick-up solenoid (SL31) ON. The
pick-up roller, feed roller1 and the separation roller then rotate sending a sheet of paper.
The paper sent into the feed unit passes through the registration paper sensor (PS31) and stops
momentarily at the registration roller. The registration clutch (CL32) is then turned ON, and the
paper is sent through into the printer.
The two photointerrupters (PS31,PS32) in the feed path detect the paper as it reaches and
passes through them. If the paper does not reach or pass through the various sensors in the
designated time, the paper deck driver assesses a paper jam and notifies the option controller
while stopping the operation.
Table 2-10-1
Table 2-10-2
CHAPTER 2
2 - 85
SW601
ON
OFF
OFF
ON
SW602
ON
ON
OFF
OFF
Almost full
High
Low
100
75
50
25
Remaining
paper %
Paper-size sensing switch
Remaining
paper level
Almost empty
SW701
OFF
ON
OFF
OFF
OFF
ON
SW702
ON
ON
OFF
ON
ON
ON
SW703
OFF
OFF
ON
ON
OFF
OFF
SW704
OFF
OFF
OFF
OFF
ON
ON
Paper size
Ledger
A3
B4
Legal
Letter
A4
Cassette-size sensing switch