EPSON Stylus COLOR 680/777/77i Revision B
Operating Principles Electrical Circuit Operating Principles 46
2.2.2.3 PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit
The motor driver IC (IC13) on the MAIN board drives PF motor. This product uses 4-
phase 200-pole hybrid type stepping motor and performs constant current bi-polar
drive.
CPU (IC9) converts PF motor phase control signal to LB11847 micro step drive form
and outputs to motor driver IC (IC13) LB11847 from port 101, 112. Based on this
signal, IC13 determines the phase mode.
The current value on each phase is determined by CPU (IC9) and outputs from port
104, 105, 107, 108, 109, 110 to driver IC (IC13). 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 104, 105, 107, 108, 109, 110 and the motor drive is turned off to save the power
consumption.
Figure 2-19. PF Motor Driver Circuit Block Diagram
2.2.2.4 CR Motor Driver Circuit
The motor driver IC (IC12) on the MAIN board drives PF motor. This product uses 4-
phase 200-pole hybrid type stepping motor and performs constant current bi-polar
drive.
CPU (IC9) converts PF motor phase control signal to LB11847 micro step drive form
and outputs to motor driver IC (IC12) LB11847 from port 81, 94. Based on this signal,
IC12 determines the phase mode.
The current value on each phase is determined by CPU (IC9) and outputs from port 83,
84, 85, 86, 87, 88, 90, 91 to driver IC (IC12). 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
83, 84, 85, 86, 87, 88, 90, 91 and the motor drive is turned off to save the power
consumption.
Figure 2-20. CR Motor Driver Circuit Block Diagram
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