EPSON Stylus PHOTO 810/820/830

Revision B

2.2.2.3 PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit

The motor driver IC (IC10) on the Main board drives PF motor. This product uses 4- phase 96-poles hybrid type stepping motor and performs constant current bi-polar drive.

CPU (IC1) transmits LB1946 micro step drive form and the current value data on each phase to motor driver IC (IC10) from port 139. Based on this signal, motor driver IC determines the phase mode.

Motor driver IC generates motor driver waveform based on these input signals and controls the motor. And also, motor driver IC monitors to prevent the fluctuations in the actual current value to motor driver IC. If motor driver IC detects the fluctuations in the actual current value, it amends the current value internally.

In case that the printer dose not receive any data for 5 minutes, CPU set the motor drive current to 0 [A] and the motor drive is turned off to save the power consumption.

CPU

 

 

LB1946

CN7

(IC1)

 

23

(IC10)

138

 

PF-SCLK

CLK

OUTA 7

1

PF-DATA

139

22

DATA OUTA- 6

3

PF-LAT

140

21

SET

OUTB 9

2

C-P47

3

27

VREF1 OUTB- 8

4

 

 

16

VREF2

 

 

C-P25

144

20

ST

 

+42v

 

 

 

 

VBB 1

 

 

 

24

MD

VCC 28

+5V

+5V

 

25

CR1

 

 

 

 

18

CR2

 

 

 

 

3

E1

 

 

 

 

12

E2

 

 

2.2.2.4 CR Motor Driver Circuit

The motor driver IC (IC11) on the Main board drives CR motor. This product uses 4- phase 200-poles hybrid type stepping motor and performs constant current bi-polar drive.

CPU (IC1) transmits LB1946 micro step drive form and the current value date on each phase to motor driver IC (IC11) from port 142. Based on this signal, motor driver IC determines the phase mode.

Motor driver IC generates motor driver waveform based on these input signals and controls the motor. And also, motor driver IC monitors to prevent the fluctuations in the actual current value to motor driver IC. If motor driver IC detects the fluctuations in the actual current value, it amends the current value internally.

In case that the printer dose not receive any data for 5 minutes, CPU set the motor drive current to 0 [A] and the motor drive is turned off to save the power consumption.

CPU

 

 

LB1946

 

CN12

(IC1)

 

 

(IC11)

 

141

23

 

1

CR-SCLK

CLK

OUTA 7

CR-DATA

142

22

DATA OUTA- 6

3

CR-LAT

143

21

SET

OUTB

9

2

C-P46

4

27

VREF1 OUTB-

8

4

 

 

16

VREF2

 

 

 

C-P25

144

20

ST

 

 

+42v

 

 

 

 

VBB 1

 

 

 

24

MD

VCC 28

+5V

 

 

 

+5V

 

25

CR1

 

 

 

 

 

18

CR2

 

 

 

 

 

3

E1

 

 

 

 

 

12

E2

 

 

 

Figure 2-21. CR motor driver circuit block diagram

Figure 2-20. PF motor driver circuit block diagram

 

Operating Principles

Electrical Circuit Operating Principles

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