BYPASS TRAY
2-L-4
2 UNIT EXPLANATION
2. Signals
a. PRCB input signals
(1) BPUP_PS (PS34 to PRCB)
Paper upper limit position detection signal (by-
pass tray)
[L]: Not detected.
[H]:Detected.
(2) BPDN_PS (PS35 to PRCB)
Paper lower limit position detection signal (by-
pass tray)
[L]: Not detected.
[H]:Detected.
b. PRCB output signal
(1) BPUDM_A, B (PRCB to M20)
M20 drive control signal
[5] Paper Size Detection Control
The size of paper in the by-pass tray is detected
by PS31 (paper size/1-BP), PS32 (paper size/2-
BP), and VR5 (paper size/BP). Based on the
detection signals, PRCB (printer control board)
judges the paper size.
1. Operation
The length of paper is detected by PS31 (paper
size/1-BP) and PS32 (paper size/2-BP). The by-
pass tray is provided with a variable resistor
(VR5) interlocked with the guide position to judge
the paper width according to the change in the
resistance value.
The relationships between the sensors and
paper sizes (lengths) are as follows:
2. Signals
a. PRCB input signals
(1) BPSIZE_S_PS (PS31 to PRCB)
Paper size detection signal
[L]: Paper does not exist.
[H]:Paper exists.
(2) BPSIZE_L_PS (PS32 to PRCB)
Paper size detection signal
[L]: Paper does not exist.
[H]:Paper exists.
(3) BPSIZE_VR (VR5 to PRCB)
Paper width detection signal
Paper size
Sensor
8.5 x 11
or less
A4R to
B5R
F4 or
larger
PS31 OFF ON ON
PS32 OFF OFF ON
VR5
PRCB
DCPS
5V2
S.GND
5VA
BPSIZE_VR
PS32
5V3
BPSIZE_L_PS
SGND
PS31
5V3
BPSIZE_S_PS
SGND
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