Pick-Up/Feed System; Outline - Canon PD-82 Service Manual

CHAPTER 2
II. PICK-UP/FEED SYSTEM
A. Outline
The paper in the paper deck is detected by the tray paper-out sensor (PS3). The paper level in
the tray is detected by a combination of outputs from paper-level detection switch 1 (SW601)
and paper-level detection switch 2 (SW602). The paper size is detected by a combination of
outputs from paper size detection switches (SW701 to SW704). The combinations of paper-
level detection switches and paper size detection switches are listed in Table 2-2-1.
When the option controller sends a pick-up command to the paper deck, the paper deck
driver runs the pick-up motor (SPM3) which rotates the pick-up roller, feed roller 1 and
separation roller.
At the same time, the paper deck driver turns ON the pick-up solenoid (SL1). This lowers
the pick-up roller to the print paper surface. As the pick-up roller turns, the paper is fed to the
paper feed unit.
The paper passes through the registration paper sensor (PS1) and stops when it touches the
registration roller. When the registration clutch (CL1) turns ON, the paper is fed to the printer.
There are two photointerrupters (PS1 and PS2) in the paper path to detect paper. If the
paper does not reach or pass through each sensor within the prescribed period of time, the
paper deck driver assumes that a paper jam has occurred, stops the operation, and reports the
jam to the option controller.
Paper-level detection switch
SW601 SW602
OFF OFF
ON OFF
ON ON
OFF ON
2 - 4
Table 2-2-1
Remaining
paper %
Paper size
100
Ledger
75
50 A3
25
B4
Legal
Letter (horizontal)
A4 (horizontal)
Tray open
Paper-size detection switch
SW701 SW702 SW703
OFF ON OFF
ON ON OFF
OFF OFF ON
OFF ON ON
OFF ON OFF
ON
ON OFF
OFF
OFF OFF
SW704
OFF
OFF
OFF
OFF
ON
ON
OFF