Canon LBP-2000, Руководство по обслуживанию

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CHAPTER 2
2 - 50
C . Using the Cassette
1 . O u t l i n e
When the video controller sends the /PRNT signal to the Printer, the CPU rotates the main motor
(M101); in about 0.15 sec, it turns on the pickup clutch (CL101) to transmit the rotation of the
main motor to rotate the cassette pickup roller.
A single sheet of paper is then fed inside by the rotation of the cassette pickup roller. The paper
moves past the registration paper sensor (PI101) to reach the registration roller. At this time, the
registration roller is not rotating so that the paper stops, and arches along its leading edge for
correction of any skew. The pickup clutch (CL101) is turned off as soon as the paper arches to stop
the rotation of the cassette pickup roller. At the same time, the registration clutch (CL102) is
turned on to move the paper once again for the transfer, separation, and fixing blocks.
• Paper Path for Cassette Pickup
Figure 2-5-3
• Basic Sequence of Operation for Cassette Pickup
Main motor
(M101)
Registration clutch
(CL102)
Pickup clutch
(CL101)
Registration paper
sensor (PI101)
STBY
INTR
PRINT
0.15
(unit: sec)
/PRNT signal IN
0.11 (approx.)
Figure 2-5-4
2 . Retry control
When the cassette is used as the source of paper, the cassette pickup roller is kept in contact with
the stack of paper at all times. As such, the Printer does not perform pickup retry control, but
prevents the occurrence of pickup delay jams by delaying the timing at which the pickup clutch
(CL101) is turned on.