TRAY 3 PAPER FEED UNIT (7155/7165)
2-K-6
2 UNIT EXPLANATION
2. Signals
a. PRCB input signals
(1) T3UP_PS (PS14 to PRCB)
Paper upper limit detection signal
[L]: Not detected.
[H]:Detected.
(2) T3RM_PS (PS16 to PRCB)
Remaining paper detection signal
[L]: Not detected.
[H]:Detected.
b. PRCB output signals
(1) T3RISEM_24 (PRCB to M18)
M18 ON/OFF control signal
[5] Paper Size Detection Control
The paper size in tray 3 is detected using PS17
(paper size/1-3), PS18 (paper size/2-3), and
VR3 (paper size/3). Based on the detection sig-
nals, the PRCB (printer control board) judges the
paper size.
1. Operation
The length of paper is detected using PS17/18
(paper size/1-3/2-3). Variable resistor (VR3)
interlocked with the guide position is installed at
the bottom of the tray to detect the width of paper.
The relationships between the sensors and
paper sizes (lengths) are as follows:
Paper size
Sensor
8.5 x 11
or less
A4R to
B5R
F4 or
larger
PS17 OFF ON ON
PS18 OFF OFF ON
PRCB
DCPS
5V2
S.GND
3.3V2
T3SIZE_VR
AGND
5V3
T3SIZE_L_PS
SGND
5V3
T3SIZE_S_PS
SGND
VR3
PS18
PS17
Tray 3
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