- HP Printer User Manual

ENWW Tray 4 paper feed unit 87
MFP unit explanation
2 Signals
a PRCB input signals
1 TIUP_PS (PS14 to PRCB)
Paper upper limit detection signal
[L]: Not detected
[H]: Detected
2 TIRM_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
Paper size detection control
The paper size in Tray 4 is detected using
PS17 (paper size/1-3), PS18 (paper
size/2-3), and VR3 (paper size/3). Based on
the detection signals, 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:
2 Signals
a PRCB input signals
1 T3SIZE_S_PS (PS17 to PRCB)
Paper size detection signal
[L]: Paper does not exist.
[H]: Paper exists.
2 T3SIZE_L_PS (PS18 to PRCB)
Paper size detection signal
[L]: Paper does not exist.
[H]: Paper exists.
3 T3SIZE_VR (VR3 to PRCB)
Paper width detection signal
No paper detection control
No paper in the tray is detected by PS15 (no
paper/3), and which is controlled by the
PRCB (printer control board).
1 Operation
When the tray becomes empty, PS15 (no
paper/3) is turned off, displaying a
message on the LCD via OB1 (operation
board/1).
Paper size
Sensor
8.5 by 11 or
less
A4R to B5R F4 or larger
PS17 OFF ON ON
PS18 OFF OFF ON
PRCB
DCPS
5V2
S.GND
PS15
5V3
T3_0PS
SGND