Paper Size Detection Control - Minolta Di850 Service Manual

[5] Paper Size Detection Control

5VDC
PS32
SGND
PS33
5VDC
PS35
SGND
PS36
PRCB
The paper size in tray 1/2 is detected using PS32
(paper size 1-1), PS33 (paper size 2-1), PS35 (paper
size 1-2), PS36 (paper size 2-2), paper size detection
VR1, and paper size detection VR2. Based on the
detection signals, the PRCB (printer control board)
judges the paper size.
1. Operation
The length of paper is detected using PS32,
PS33, PS35, and PS36. Variable resistors (VR1
and VR2) are 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
PS32 or PS35 OFF
PS33 or PS36 OFF
PS32
PS33
VR1
VR1
PS35
PS36
VR2
VR2
5VDC
SGND
DCPS1
A4R to 8.5 x 14
F4
B5R or larger
OFF ON ON
ON ON OFF
2. Signals
a. Input signals
(1) PS32 (PS32 to PRCB)
Paper size detection switch ON/OFF signal (tray
1).
(2) PS33 (PS33 to PRCB)
Paper size detection switch ON/OFF signal (tray
1).
(3) PS35 (PS35 to PRCB)
Paper size detection switch ON/OFF signal (tray
2).
(4) PS36 (PS36 to PRCB)
Paper size detection switch ON/OFF signal (tray
2).
(5) VR1 (VR1 to PRCB)
Paper width detection signal (tray 1).
(6) VR2 (VR2 to PRCB)
Paper width detection signal (tray 2).
2-J-7
TRAY 1/2 PAPER FEED UNIT