Pf Motor Drive Circuit - Epson LG1-1070 Service Manual

PF Motor Drive Circuit

The stepping that the printer uses to advance the paper can advance it by a
motor
minimum of 1/360 inch. The
drive type. P70 to P73 on the CPU are the phase control ports for the stepping
motor. PF motor phase data is output through these ports. Cl to C4 are turned on
and off within the PU1501 (IC3) based on the phase data sent
When the paper advance motor is running, the supply voltage to the PF motor coil is
supply voltage to the coil is +5 V. Switching between these two supply voltages
occurs at the CP terminal of the PU1501 (IC3) when the switch is turned on or off.
P 7 1
P72
P73
Data
Bus
Epson LQ-570+/1 070+
is a 2-2 phase or l-2 phase, constant-voltage
motor
B2
B3
B4
BP
P3 .
Figure B-8. PF Motor Drive Circuit
CPU.
. .
B-13