Motor Driver - Samsung SF-4500 Service Manual

6-1-6 Motor Driver

6-1-6-1. GENERAL
This product use 3 stepper motors, i.e. CR(Cartridge
Return) motor and LF(Line Feed) motor, TX
(Transmission) motor.
CR motor moves left and right all-in-one carriage of
inkjet head and shuttle scanner. It helps the printer
print accurately on the paper. LF motor is driven to
feed and eject paper for printing and to feed and eject
documents to read for scanning. Bi-polar CR motor is
controlled half step with maximum 24ips(inch/sec),
while LF motor half step and
quarter step at maximum 6ips.
CRIA1
CR_REF
(CRIB1)
H L
L L
L L
X H
As shown in the above table, current in each mode is
adjusted by voltage of driver(U25, U28) CRVREF
input. If the output of CR_REF signal controlled by
MFP controller(U16) is "low", TR(Q12) will be turned
off and the voltage put in to CRVREF of
driver (U25, U28) with +5V divided will go up
(+4.5V).
6-22
CRIA0
CURRENT(mA)
(CRIB0)
L 490
L 670
L 670
H
6-1-6-2. CR (CARRIAGE RETURN) MOTOR
DRIVING CIRCUIT
CR motor moves the carriage left and right when ink
cartridge prints something on paper.
- Motor Type : Stepper motor, bi-polar
- Driving Voltage : +30V
- Winding Resistance : 6Ω ± 10%
- Driving IC : TEA3718DP × 2
OPERATION
Mono LQ is being driven
Color draft is being driven
Mono draft is being driven
0
It becomes the standard of the driver, resulting in
high current. If CR_REF output is "high", TR(Q12)
will be turned on and the voltage put in to CRVREF
will go down (+3.0V), resulting in low current in the
motor.
No current
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