Pcl/Tsl Control; Separation Claws Control - Konica Minolta 7020 Service Manual

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DRUM UNIT
[3]

PCL/TSL Control

3
24VDC
24VDC
PGND
PGND
SGND
5VDC
DCPS
The PCL (pre-charging lamp) and TSL (transfer synchro-
nization lamp) are LED type lamps, and are controlled by
the PRDB.
1. Operation
PCL lights when the START button is pressed, and
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goes OFF after the specified period from when PS3
(paper exit PS) (or PS2 (fixing exit PS) for machines
other than the 7020/25/30/35) goes OFF (when the
final sheet of copy paper is exited). TSL comes ON at
a predetermined time interval after MC1 (registration
clutch) comes ON, and goes OFF at a predetermined
time interval after PS1 (registration PS) goes OFF.
2. Signals
a. Input signal
(1) PS1 (PS1 −> PRDB)
Detection of paper at paper feed temporary stop
position.
[H] when paper is detected.
b. Output signals
(1) PCL DRIVE (PRDB −> PCL)
PCL ON/OFF control signal.
[L]: PCL ON
[H]: PCL OFF
(2) TSL DRIVE (PRDB −> TSL)
TSL ON/OFF control signal.
[L]: TSL ON
[H]: TSL OFF
24VDC
PCL
PCL CONT
24VDC
TSL
TSL DRIVE
5VDC
MC1
MC1 DRIVE
SGND
PS1 PS1
5VDC
SVDzzc
PS2
PS2
SGND
SGND
PS3 PS3
5VDC
PRDB
7020/25/30/35
2-E-2
[4]

Separation Claws Control

24VDC
24VDC
PGND
PGND
SGND
5VDC
DCPS
The separation claws are driven by SD7 (separation claw
SD), which is controlled by the PRDB (printer drive board).
1. Operation
SD7 comes ON at a predetermined interval after MC1
(registration clutch) comes ON, causing the separa-
tion claws to make contact with the drum so as to as-
sist in separating the paper from the drum.
2. Signals
a. Output signal
(1) SD7 DRIVE (PRDB −> SD7)
SD7 drive control signal.
[L]: SD7 ON
[H]: SD7 OFF
24VDC
SD7
SD7 DRIVE
5VDC
MC1
MC1 DRIVE
PRDB