Epson LQ-570+ Panduan Servis - Halaman 26

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REV.-A

PF Drive Circuit

2.3.5 MOTOR,

The printer uses a stepping motor to advance the paper. The paper can be advanced for minimum of

1/380 inch. The nmtor is a 2-2 phase or 1-2 phase, constant-voltage drive type. P70 to P73 on the

CPU are the phase oontml ports forthe stepping motor. MOTOR, PF phase data output through these

ports. Cl to C4 are turned on and off within the PU1501(IC3) acoording to the phase data sent from

the CPU.

When the paper advanoe motor is running, the supply voltage to the mil of the MOTOR,PF is +35 V.

When the paper advance motor is not running and is in hold state, the supply voltage to the coil is +5

V. Switching between these two supply voltages oocursat the CPterminal of the PU1501(IC3) when

the switch is turned on or off.

Data

Bus

E05A50

Figure 2-23. MOTOR, PF Drive Circuit

2-18

c l

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