Epson LQ-570+ Servicehandleiding - Pagina 25

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1. Hardware Specifications

REV.-A

2.3.4 MOTOR, CR Drive

Figure 2-22 shows the MOTOR, CR driie circuit. An open-loop, constant-current drive control is used

to drive the MOTOR, CR. The motor is driven by 2-2 phase excitation and 1-2 phase excitation. 2-2

phase excitation corresponds to two 1-2 phase excitation steps. Thus, for each single step phase

change of a 2-2 phase excitation motor, the carriage moves 1/120 inch. For each single step phase

change of a 1-2 phase excitation motor, the carriage moves 1/240 inch.

The MOTOR, CR driie circuit of the STK-67128 detects the amount of current flow in the MOTOR, CR

coil and regulates it. The current flowing through the coil varies depending on the speed of the

MOTOR, CR.

The amount of current is set by the CPU via the E05A50 l/O port. Signals are sent to Vrefl or Vref2

on the STK-67128. The STK-67128 sets the coil current to mnespond to the MOTOR, CR speed.

Ports P60 to P63 on the CPU are used exclusively as phase control potts for the stepping motor.

Drive Mode

Extension Type

3 x speed

2-2 phase

2 x speed

2-2 phase

1.5 x speed

2-2 phase

4/3 x speed

1-2 phase

1 x speed

1-2 phase

3/4 x speed

1-2 phase

2/3 x speed

1-2 phase

1/2 x speed

1-2 phase

Circuit

Current

Control

Circuit

Figure 2-22. MOTOR, CR Drive Circuit

Type Drive Frequency

2695

1773 pps

1347 pps

1191 pps

1796

1347 pps

1190 pps

898

2-17

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Standard Print Character

Draft

High Speed LQ