Motor Driver Circuit - Epson PH890 Service Manual

EPSON Stylus Photo 890/1290

2.2.2.3 Motor Driver Circuit

Stylus Photo 890/1290 is equipped with 3 kinds of motors, the CR motor and PF motor
that are a DC motor and an ASF/Pump motor, and a stepping motor. The DC motor on
the C393MAIN board is used for DC motor control.
CR motor driver circuit
IC9 (A39374SLB) on the C393MAIN/C393MAIN-B board controls the CR and PFDC
motor while IC9(A3958SLB) on the C393MAIN-C board controls the CR motor.
ASIC sends signals of IC9 through IC8 and determines current of the CR motor. By
setting RST_DCMCU of ASIC "LOW " level, the motor turns into a
"SLEEP"condition for energy saving.
The block diagram of the CR motor driver IC (IC9) is as shown below.
Figure 2-18. CR Motor Driver Circuit Block Diagram (C393MAIN)
OPERATING PRINCIPLES
Figure 2-19. CR Motor Driver Block Diagram (C393MAIN-B)
Electrical Circuit Operating Principles
Revision B
op13b
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