Epson LQ 1050 Technical Manual - Page 98

REV.-A

Gate Array

(IC3A:

E05A15HA)

This gate array

(IC3A)

directly controls phase switching

rotational direction, under control of the CPU. Data for

expanded in the paper feed motor phase switching circuit,

to switch the rotational direction of the paper feed motor.

CPU

(4B)

PD3

I

PDO

CR

~D

@

for the paper feed motor to switch the

phase switching is sent from the CPU,

and output as the phase switching signal

GA[E05A15HA)

1

( 3A)

4

Paper Feed

Motor

Phase Switching —

Circuit

G

Latch

~D

1

i

Mode

Reg.

-

Figure 2-44. GA (E05A15HA) Function for Paper Feed Motor

Paper Feed Motor Excitation System

The paper feed motor is controlled by the open-loop constant voltage drive circuit. The phases of

the paper feed motor are controlled by

PFA-PFD

of the gate array

(IC3A:

E05A15HA).

2-2 Phase excitation system is used.

The paper feed motor has one driving transistor per winding

(unipolar

drive), two driver’s become

active in the 2-2 phase excitation system.

Figure 2-45 shows the 2-2 phase excitation system.

(

IC2A)

A02

‘

N

OFF

C02

ON

OFF

B02

‘

N

OFF

002

‘

N

OFF

Step

Rotation

Figure 2-45.

I

I

I

I

I

I

I

1

1

2

3

4

C.c.

w

~

C.w

Phase Excitation System

,:.

”-’

2-54

Section	Page
Front Cover	1
Preface	3
Revision Table	4
Precautions	5
Table of Contents	6
1. General Description	7
1.2 Specifications	12
2. Operating Principles	41
3. Optional Equipment	109
4. Disassembly, Assembly & Adjustment	110
5. Troubleshooting	157
6. Maintenance	178
Appendix	185
Overseas Marketing Locations	224

Epson LQ 1050 Technical Manual - Page 98

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