Service manual

TRAY 1/2 PAPER FEED UNIT
2-J-7
2 UNIT EXPLANATION
[5] Paper Size Detection Control
The paper size in tray 1/2 is detected using PS32
(paper size 1-1), PS33 (paper size 2-1), PS35 (paper
size 1-2), PS36 (paper size 2-2), paper size detection
VR1, and paper size detection VR2. Based on the
detection signals, the PRCB (printer control board)
judges the paper size.
1. Operation
The length of paper is detected using PS32,
PS33, PS35, and PS36. Variable resistors (VR1
and VR2) are installed at the bottom of the tray to
detect the width of paper.
The relationships between the switches and
paper sizes (lengths) are as follows:
2. Signals
a. Input signals
(1) PS32 (PS32 to PRCB)
Paper size detection switch ON/OFF signal (tray
1).
(2) PS33 (PS33 to PRCB)
Paper size detection switch ON/OFF signal (tray
1).
(3) PS35 (PS35 to PRCB)
Paper size detection switch ON/OFF signal (tray
2).
(4) PS36 (PS36 to PRCB)
Paper size detection switch ON/OFF signal (tray
2).
(5) VR1 (VR1 to PRCB)
Paper width detection signal (tray 1).
(6) VR2 (VR2 to PRCB)
Paper width detection signal (tray 2).
Paper size
Switch
8.5 x 11
or less
A4R to
B5R
F4
8.5 x 14
or larger
PS32 or PS35 OFF OFF ON ON
PS33 or PS36 OFF ON ON OFF
PRCB DCPS1
PS32
PS33
VR1
PS35
PS36
VR2
5VDC
PS32
SGND
PS33
VR1
5VDC
PS35
SGND
PS36
VR2
5VDC
SGND
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