Paper Size Detection Control - Konica Minolta 7020 Service Manual

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PAPER FEED UNIT
2. Signals
a. Input signals
(1) PS9 (PS9 −> PRDB)
Upper tray detect signal.
[L]: tray is present;
[H]: tray is not present.
Detection of the tray causes M7 to raise the paper in
the upper tray.
(2) PS12 (PS12 −> PRDB)
Lower tray detect signal.
[L]: tray is present;
[H]: tray is not present.
Detection of tray causes M8 to raise the paper in the
lower tray.
(3) PS7 (PS7 −> PRDB)
Upper limit detect signal for upper tray.
Goes [H] when paper in the upper tray has been
raised to the upper limit, causing M7 to go OFF.
(4) PS10 (PS10 −> PRDB)
Upper limit detect signal for lower tray.
Goes [H] when paper in the lower tray has been
raised to the upper limit, causing M8 to go OFF.
b. Output signals
(1) M7 DRIVE (PRDB −> M7)
M7 drive control signal.
[L]: M7 ON
[H]: M7 OFF
(2) M8 DRIVE (PRDB −> M8)
M8 drive control signal.
[L]: M8 ON
[H]: M8 OFF
[5]

Paper Size Detection Control

24VDC
24VDC
PGND
PGND
SGND
5VDC
DCPS
Tray paper size is detected by the PRDB (printer driver
board) based on detection signals issued from the PFDBs
(paper feed detection boards). Detection of paper size in
the by-pass tray is carried out by PS20 (bypass tray
paper size detect PS) and VR1 (bypass tray paper size
VR).
2-J-4
SGND
PS20
PS20
5VDC
5VDC
VR1 ANG
VR1
SGND
U SIZE D
U SIZE C
SW1
U SIZE B
U SIZE A
U SIZE SELECT
PFDB(UPPER)
L SIZE D
L SIZE C
SW2
L SIZE B
L SIZE A
L SIZE SELECT
PRDB PFDB(LOWER)