Driving Circuit - Xerox WorkCentre XK50cx Service Manual

4-2-2 MOTOR CONTROL PART
GENERAL
This part use 1 dc motor and 2 stepper motors,
i.e. CR(Cartridge Return) motor and LF(Line Feed)
motor, SCAN motor.
CR motor moves left and right all-in-one carriage of
inkjet head. It helps the printer print accurately on
the paper. LF motor is driven to feed and eject paper
for priting and to feed and eject documents to read
for scanning. CR dc motor is controlled dc control
block, while LF motor half step and quarter step at
maximum 6ips.
CR(CARRIAGE RETURN) MOTOR

DRIVING CIRCUIT

CR motor moves the carriage left and right when ink
cartridge prints something on paper.
- Motor Type : PMDC Motor
- Driving Voltage : +30V
- Winding Resistance : 11Ω ± 2Ω
CR driving circuit has a protection circuit which is
enabled at 550mA and cut off the motor current.
As shown in the table below, current in each mode
is adjusted by voltage of driver(U5) PIN12 input. If
the PWM signal controlled by MFP controller(Main
PBA U15) is "high".
It becomes the standard of the driver, resulting in
high current drive mode. If PWM is "low", it results in
no current in the motor.
Motor Driver OFF
DIR L
PWM L
CURRENT X
DIRECTION outB ›out A
OPERATION STOP
DIRECTION
ON OFF ON
L H H
H L H
B › A X outA ›out B
A › B
RIGHT STOP LEFT
DIRECTION
Circuit
4-23