Epson LQ-570e Service Manual page 55

EPSON LQ-580
o PF Motor Circuit
Control
Signal
Reference
Current
Figure 2-7. PF Motor Drive Circuit
The PF motor circuit specifications are shown in the table below.
Items
Drive voltage +35V± 6%
Driving method Regular current uni-polar drive
Driving IC SANYO LB1847
Excitation method 2-2 phase / 1-2 phase (orthogon)
Operating Principles
Table 2-8.
Specification
The PF motor drive circuit is shown below (Refer to Appendix - Cuicirt Diagram in detail).
Items
Phase switching
Current value setting
Current detection
resistance
Reset output
Circuit Operation
Specification
Generate driving IC control signal by G/A based on trigger signal
(CPU output) and output.
Vref setting by dividing resistance Setting: 2
0.82Ω ± 2% 1W
ENA/ ENB signal (G/A output) both: High (Output current OFF)
Revision C
55