Pf Motor (Pf/ Pump/ Asf Motor) Driver Circuit; Cr Motor Driver Circuit - Epson STYLUS COLOR 480 Service Manual

EPSON Stylus COLOR 480

2.2.2.3 PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit

The motor driver IC (IC9) on the MAIN board drives PF motor. This product uses 4-
phase 48-pole hybrid type stepping motor and performs constant current bi-polar drive.
CPU (IC1) converts PF motor phase control signal to LB1845 micro step drive form
and outputs to motor driver IC (IC9) LB1845 from port 12, 17. Based on this signal,
IC9 determines the phase mode.
The current value on each phase is determined by CPU (IC1) and outputs from port 13,
14, 15, 16, to driver IC (IC9). Motor driver IC generates motor driver waveform based
on these input signals and controls the motor. If the printer dose not receive any data
from PC for 5 minutes, CPU set the motor drive current to 0 via port 13, 14,15,16 and
the motor drive is turned off to save the power consumption.
Figure 2-20. PF Motor Driver Circuit Block Diagram
Operating Principles

2.2.2.4 CR Motor Driver Circuit

The motor driver IC (IC8) on the MAIN board drives PF motor. This product uses 4-
phase 48-pole hybrid type stepping motor and performs constant current bi-polar drive.
CPU (IC1) converts PF motor phase control signal to LB1845 micro step drive form
and outputs to motor driver IC (IC8) LB1845 from port 139, 144. Based on this signal,
IC8 determines the phase mode.
The current value on each phase is determined by CPU (IC1) and outputs from port
140, 141, 142, 143, to driver IC (IC8). Motor driver IC generates motor driver
waveform based on these input signals and controls the motor. If the printer dose not
receive any data from PC for 5 minutes, CPU set the motor drive current to 0 via port
140, 141,142,143 and the motor drive is turned off to save the power consumption.
Electrical Circuit Operating Principles
Figure 2-21. CR Motor Driver Circuit Block Diagram
Revision B
48