Pcl/Tsl Control - Minolta Di850 Service Manual

CORONA UNIT SECTION
c. Cleaning operation
The home position of the transfer and separation
wire cleaning pads is on the front side of
machine. The transfer and separation wire
cleaning pads operate as follows:
Transfer/Separation wire
cleaning pad HP
PS11
Cleaning (forward)
Cleaning (return)
Home search (forward)
Home search (return)
2. Signals
a. PRCB input signals
(1) PS11 (PS11 to PRCB)
Transfer and separation wire cleaning pads
home position detection signal.
This signal detects the reference position of the
transfer and separation wire cleaning pads home
position (front side).
[L]: HP detected
[H]: HP not detected
(2) PS12 (PS12 to PRCB)
Transfer and separation wire cleaning pads drive
limit detection signal.
This signal detects the rear limit position of the
transfer and separation wire cleaning pads.
[L]: Limit position detected
[H]: Limit position not detected
b. ADUSDB output signals
(1) M18 DRIVE1, 2 (ADUSDB to M18)
M18 drive control signal.
The drive direction of M18 is controlled by switch-
ing the drive current directions of two signals.
Status M18 DRIVE1 M18 DRIVE2
Forward stroke of
cleaning
Return stroke of
cleaning
Stop
Transfer/Separation wire
cleaning pad limit
PS12
H L
L H
L L
2-F-6

[7] PCL/TSL Control

24VDC
PGND
DCPS2
24VDC
PCL CONT
PRCB
LEDs are used for PCL (pre-charging exposure lamp)
and TSL (transfer synchronization lamp).
driven by PRCB (printer control board). TSL is driven
by ADUSDB (ADU stand drive board), and the control
is conducted by PRCB.
1. Operation
PCL is turned ON/OFF in sync with M2 (drum).
TSL turns ON after a lapse of specified time from
turning ON of PS45 (leading edge detection) of
the second paper feed section. It turns OFF after
a lapse of specified time from detection of the
trailing edge of copy paper.
2. Signals
a. Output signals
(1) PCL CONT (PRCB to PCL)
PCL ON/OFF control signal.
[L]: PCL ON
[H]: PCL OFF
(2) TSL CONT (ADUSDB to TLS)
TSL ON/OFF control signal.
[L]: TSL ON
[H]: TSL OFF
24VDC
TSL
TSL CONT
ADUSDB
PCL
PCL is