- HP Printer User Manual

60 MFP unit explanation ENWW
2 EM (S).SIG (HV to PRCB)
This signal indicates the leak or short
state of the separation corona unit.
[L]: Normal
[H]: Abnormal
b PRCB output signals
1 T.CONT (PRCB to HV)
This signal turns on/off the voltage
applied to the transfer wire.
[L]: Transfer voltage on
[H]: Transfer voltage off
2 S.CONT (PRCB to HV)
This signal turns on/off the voltage
applied to the separation wire.
[L]: Separation voltage on
[H]: Separation voltage off
M14 (charger cleaning) control
M14 (charger cleaning) is a DC motor
powered by 24 VDC and is controlled by
PRCB (printer control board).
1 Operation
a Purpose of driving
M14 (charger cleaning) is used to drive
the charging wire cleaning unit.
b Operation timing
The charging wires are cleaned when
SW2 (sub power) is turned on and when
the fuser temperature is lower than
50° C. They are also cleaned after the
specified copy count is reached.
*Changeable with the 25-mode DIP SW
c Cleaning operation
Normally, the charging wire cleaning
unit is on the front side of the machine.
It moves back and forth to clean the
charging wires. The movement direction
is changed by changing the rotational
direction of M14 (charge cleaning).
The rotational direction of M14 and the
position of the cleaner are detected by
monitoring the current value of M14 with
PRCB (printer control board).
2 Signals
a Output signal
1 CHGM_A, B (PRCB to M14)
M14 (charger cleaning) drive control
signal.
The drive direction of M14 is
controlled by switching between the
drive current directions of two signals.
M14
PRCB
CHGM A
CHGM B
DCPS
24V/1
5V/2
S.GND
P.GND
Status CHGM_A CHGM_B
Forward stroke of
cleaning
HL
Backward stroke of
cleaning
LH
Stop L L