Paper Size Detection Control - Minolta Di551 Service Manual

TRAY 1/2 PAPER FEED UNIT
2. Signals
a. PRCB input signals
(1) TIUP_PS (PS2 to PRCB)
Paper upper limit detection signal (tray 1)
[L]: Not detected.
[H]: Detected.
(2) TIRM_PS (PS4 to PRCB)
Remaining paper detection signal (tray 1)
[L]: Not detected.
[H]: Detected.
(3) TIUP_PS (PS8 to PRCB)
Paper upper limit detection signal (tray 2)
[L]: Not detected.
[H]: Detected.
(4) TIRM_PS (PS10 to PRCB)
Remaining paper detection signal (tray 2)
[L]: Not detected.
[H]: Detected.
b. PRCB output signals
(1) T1RISEM_24V (PRCB to M16)
M16 ON/OFF control signal (tray 1)
(2) T2RISEM_24 (PRCB to M17)
M17 ON/OFF control signal (tray 2)

[5] Paper Size Detection Control

PRCB
The paper size in tray 1/2 is detected using PS5/
6/11/12 (paper size/1-1/2-1/1-2/2-2), and VR1/2
(paper size/1/2). Based on the detection signals,
the PRCB (printer control board) judges the
paper size.
1. Operation
The length of paper is detected using PS5/6/11/
12 (paper size/1-1/2-1/1-2/2-2) . Variable resis-
tors (VR1/2) interlocked with the guide position
are 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
PS5/11
PS6/12
2-J-6
Tray 1
5V3
T1SIZE_S_PS PS5
SGND
5V3
T1SIZE_L_PS PS6
SGND
3.3V2
T1SIZE_VR VR1
AGND
Tray 2
5V3
T2SIZE_S_PS PS11
SGND
5V3
T2SIZE_L_PS PS12
SGND
3.3V2
T2SIZE_VR VR2
AGND
5V2
S.GND
DCPS
8.5 x 11 A4R to F4 or
or less B5R larger
OFF ON ON
OFF OFF ON