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[5] Paper Size Detection Control
5VDC
PS38
SGND
PS39
VR3
PRCB
The paper size in tray 3 is detected using PS38 (paper
size 1-3), PS39 (paper size 2-3) and paper size detec-
tion VR3. Based on the detection signals, the PRCB
(printer control board) judges the paper size.
1. Operation
The length of paper is detected using PS38 and
PS39. A variable resistor (VR3) is 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:
Paper size
8.5 x 11
or less
Switch
PS38
OFF
PS39
OFF
2. Signals
a.
Input signals
(1) PS38 (PS38 to PRCB)
Paper size detection switch ON/OFF signal.
(2) PS39 (PS39 to PRCB)
Paper size detection switch ON/OFF signal.
(3) VR3 (VR3 to PRCB)
Paper width detection signal.
PS38
PS39
VR3
5VDC
SGND
DCPS1
A4R to
8.5 x 14
F4
B5R
or larger
OFF
ON
ON
ON
ON
OFF
[6] No Paper Detection Control
PRCB
No paper in the tray is detected by PS28 (no paper 3)
which is controlled by the PRCB (printer control board).
1. Operation
When the tray becomes empty, PS28 is turned
ON, displaying a message on the LCD via the
OB1 (operation board 1).
2. Signal
a.
Input signals
(1) PS28 (PS 28 to PRCB)
No paper detection signal.
[L]: Paper does not exist in tray
[H]: Paper exists in tray
2-K-5
TRAY 3 PAPER FEED UNIT
5VDC
PS28
PS28
SGND
5VDC
SGND
DCPS1
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