Konica Minolta 7020 Service Manual page 85

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1. Operation
a. Paper size detection for upper and lower
trays
Paper size for the upper tray is set by SW1 on PFDB
(UPPER), and paper size for the lower tray is set by
SW2 on PFDB (LOWER). The PRDB detects the
switch signals output in accordance with position of
each of these switches. The following table shows
the relation between switch signals and paper size.
For U.S.A.
Paper size
Tray1
8.5 x 14 11 x 17
B5R A5R
B4 A4
A5R A4R
A4 A3
A4R F4
F4 5.5 x 8.5
5.5 x 8.5 8.5 x 11
8.5 x 11 8.5 x 11R
8.5 x 11R 8.5 x 14
For Europe
Paper size
Tray1
8.5 x 14
B5
B4
A5R
A4
A4R
F4
5.5 x 8.5
8.5 x 11
8.5 x 11R
Switching
Tray2
SIZE A SIZE B SIZE C
Switching
Tray2
SIZE A SIZE B SIZE C
11 x 17
B5
B4
A5R
A4
A4R
A3
F4
8.5 x 11
8.5 x 11R
b. Paper size detection for bypass tray
Paper length in the by-pass tray is detected by PS20
ON/OFF. Paper width in the bypass tray is detected
by VR1, whose resistance value changes in
accordance with the tray's guide position.
2. Signals
a. Input signals
(1) PS20 (PS20 −> PRDB)
Paper length detection signal for bypass tray.
[L]: B4 size or more
SIZE D
[H]: A4R size or less
(2) VR1 ANG (VR1 −> PRDB)
Paper width detection signal for bypass tray.
(3) U SIZE A, B, C, D (PFDB (UPPER) −> PRDB)
Paper size ON/OFF detect signals for upper tray.
(4) L SIZE A, B, C, D (PFDB (LOWER) −> PRDB)
Paper size ON/OFF detect signals for lower tray.
SIZE D
2-J-5
PAPER FEED UNIT