- HP Printer User Manual

ENWW Drum unit 57
MFP unit explanation
*2 Transport assistance
The thick paper conveyance ability has
been improved by the use of ratchets
(star wheels).
Separation claw control
Separation claws are driven by SD1
(separation claw). Separation claws are
swung by M2 (drum). SD1 is controlled by
PRCB (printer control board).
1 Operation
a Separation claw ON/OFF control
SD1 (separation claw) is a pull-type
solenoid powered by 24 VDC. It turns
on to press separation claws against the
drum to help image-copied paper
separate.
1 SD1 (separation claw) operation
timing
SD1 turns on after a lapse of
specified time from turning on of
PS43 (leading edge) of the second
paper feed section. It turns off after a
lapse of the time set by PRCB (printer
control board).
b Separation claw swing control
Separation claws are swung by M2
(drum) via the cam mechanism.
2 Signals
a Output signal
1 SPSD_DRV (PRCB to DCDB)
SD1 (separation claw) drive control
signal
[L]: SD1 on
[H]: SD1 off
Paper guide plate control
To prevent toner from adhering to the paper
guide plate, a constant voltage is applied to
the paper guide plate. This voltage is
supplied from HV (high voltage unit) and is
controlled by PRCB (printer control board).
1 Operation
a ON/OFF timing
Turning ON/OFF in sync with M2 (drum)
b Applied voltage
-500 VDC
2 Signal
a Output signal
1 GP. CONT (PRCB to HV)
This signal controls turning ON/OFF
the voltage application to the paper
guide plate.
[L]: Voltage applied
[H]: Voltage not applied
PRCB
DCPS
24V2
P.GND
MS1 MS2
M2
SD1
5V
P.GND
DRUM CONT
DRUM CLK
CW/CCW
DRUM EM
MC24V 2
SPSD DRV
PRCB
DCPS
24V2
P.GND
GP
MS1 MS2
HV
GP.CONT