Mechanisms; Paper Exit/Adu Conveyance Switching Control - Konica Minolta 7020 Service Manual

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ADU/PAPER EXIT SECTION
[2]

Mechanisms

Mechanism
Paper path
switching (*1)
Paper conveyance
*1:Switching of the paper path
The switching guide directs the paper that exits
from the fixing unit to either to the exit area or to
the ADU unit.
• Switching operation
For double sided copies, the switching guide
directs the paper to the rear side of the ADU door.
The trailing edge of the sheet reaches the point
just in front of the ADU rollers, at which point the
switching mylar returns the sheet to the feed path,
the ADU rollers reverse direction, and the sheet is
conveyed back to the drum unit.
Method
Switching guide,
Switching PET
Roller conveyance
Switching
guide
Switching
PET
ADU roller
[3] Paper Exit /ADU Conveyance
Switching Control
3
24VDC
24VDC
PGND
PGND
SGND
5VDC
DCPS
The paper exit unit's SD5 (ADU gate SD) switches the
3
conveyance path toward either the exit or the ADU unit.
The paper is conveyed by M1 (main motor) and M9 (paper
feed motor), and M1 and SD5 are controlled by PRDB
(printer drive board). M1 and SD5 are controlled by the
PRDB (printer drive board). Related signals are MC1
(registration clutch), PS19 (exit limit detect PS), PS2
(fixing exit PS) and PS3 (paper exit PS).
Caution :
In the case of a machine other than the 7020/
25/30/35, the function normally performed by
PS3 is performed by PS2. PS19 is installed
only on old type 7020/25/30/35 machines.
1. Operation
a. Control of paper exit /ADU conveyance
switching
In single sided copy mode, SD5 remains OFF and
paper exits straight to the exit unit. In double sided
copy mode, SD5 comes ON during copying of the
front side, so that the paper is conveyed into the ADU
unit. The ADU unit inverts the paper so that the back
side of the paper is copied. When PS2 goes OFF by
the last paper, SD5 goes OFF, so that paper is
directed to the exit.
2-L-2
24VDC
24VDC
PGND
PGND
M1
LOCK SIG
M1 CLK
M1 CONT
5VDC
SGND
MC1 DRIVE
MC1
24VDC
24VDC
SD5
SD5 DRIVE
SGND
PS1 SIG
PS1
5VDC
SGND
EXIT PS PS3
5VDC
7020/25/30/35
SGND
FULL PS PS19
PRDB
5VDC
Old type 7020/25/30/35