Konica Minolta bizhub 40p, Service Manual

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9. Media feed section (Tray 1 / Tray 2) Theory of operation V er. 1.0 Dec. 2007
24
bizhub 40P
Composition/Operation
B. Size Switch
• A switch for setting the size of paper supplied from each Paper Cassette is mounted. A
signal indicating the set size is transmitted as a voltage to the PRCB.
C. Actuator for empty sensor
• If paper runs out in the Paper Cassette, the actuator for empty sensor drops and the flag
of the actuator for empty sensor that shielded the detection portion of the empty sensor
moves off the detection portion. Thus, the light is transmitted.
D. Media empty sensor
• The presence or absence of paper in the Paper Cassette is detected by the position of
the actuator for empty sensor. This is converted into an electrical signal. If the detection
portion is shielded (i.e., there is paper), TRAY1 MEDIA S
N R O N or PS3 O N signal is
turned OFF.
E. Registration sensor
• The paper transported from the Paper Cassette pushes up the actuator b. The flag of the
actuator a optically unshields the detection portion of the registration sensor. Thus, the
passage of paper is detected.
F. Registration roller clutch
• This electromagnetic clutch turns O N and OFF the driving force to the Registration roller
and Registration roller (driven), to place the paper in position.
G. Actuator for near empty sensor
• When paper is low in the Paper Cassette installed in the Tray2, the arm of the actuator for
near empty sensor is pushed up by the media pressure plate. The flag of the actuator for
near empty sensor that shielded the detection portion of the near empty sensor moves
off the detection portion. Thus, the light is transmitted.
H. Near empty sensor
• When paper is low in the Tray2 Paper Cassette, this is detected by the position of the
actuator for near empty sensor and converted into an electrical signal. When the detec-
tion portion is shielded (i.e. paper is high), PS4 O
N signal is turned OFF.
9.3.3 Control of Paper Size
• The following table gives the states (O N (1) or OFF (0)) of the switches in the Size Switch,
corresponding to the paper sizes of the Paper Cassette.
Paper size
Size Switch
SW1 SW2 SW3 SW4
N o cassette 0 0 0 0
Executive S 0 0 0 1
B5(JIS) S 0 0 1 1
A5 S 0 1 0 1
Legal14"S 0 1 1 1
Letter S 1 0 0 1
A4 S 1 1 0 1
Legal13"S 1 1 1 1