Pick-Up/Feed System - Canon LBP 2460 - B/W Laser Printer Service Manual

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.
Paper size
Table 2-10-1
Paper-size sensing switch
SW601 SW602
ON ON
OFF ON
OFF OFF
ON OFF
Cassette-size sensing switch
SW701
Ledger OFF
ON
A3
OFF
B4
OFF
Legal
OFF
Letter
ON
A4
Table 2-10-2
Remaining Remaining
paper level paper %
Almost full
100
High
75
Low
50
Almost empty
25
SW702
SW703 SW704
ON
OFF OFF
ON OFF OFF
OFF ON OFF
ON ON OFF
ON OFF ON
ON OFF ON
CHAPTER 2
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