EPSON Stylus PHOTO 810/820/830

Revision B

2.2.3.4 Reset Regulator Circuit

Reset IC (IC3) on the main board monitors the two voltage: +5V for the logic line and +42V for the drive line. Reset IC outputs the reset signal to CPU (IC8) in the following case.

1.When the printer power is turned on and reset IC detects 4.2V on +5V line/35.8V on +42V line, reset signal is output to perform the initialize operation correctly.

2.When the printer power is turned off and reset IC detects 4.2V on +5V line/35.8V on +42V line, reset signal is output to stop the printer operation safely.

3.When reset IC detects 4.2V on +5V line/35.8V on +42V line with fail during the printer operation, reset signal is output to stop the printer operation safely.

Unlike the previous products, the timer IC is not built in the reset IC and the Lithium battery is not mounted on this MAIN board either.

 

 

 

.

 

 

+42V

+5V

IC3

+3.3V

 

 

 

 

 

 

 

M62510FP

+1.5V

 

 

4

VCC

VOUT1

 

 

 

3

 

 

 

Vin1

 

 

IC8

 

12

VOUT2

 

 

Vin2

 

 

5

 

 

 

E01A37CB

 

IN

 

 

 

 

 

VD2

 

 

 

 

 

 

 

 

1

GND

 

37 MRES

 

7

GND

Vres

 

8

GND

VOUT2

30

NMILVL

 

14

GND

VOUT1

29

RESET

Figure 2-28. Reset Regulator circuit block diagram

Main line for reset regulator IC has the following function.

„VOUT1: Reset line

„VOUT2: Interrupt signal

„

IN:

+42V line monitoring line

„

VCC:

+5V line monitoring line

*Unlike Stylus C50/C60, Stylus C61/C62 does not have exclusive regulator IC which generates +3.3VDC from +5VDC. Instead of the regulator IC, this IC generates +3.3VDC from +5VDC.

2.2.3.5 EEPROM Control Circuit

When the printer power is turned off, the following information is stored in EEPROM (IC5) which is nonvolatile memory. And, when the printer power is on, CPU (IC8) reads the information from EEPROM.

Information stored in EEPROM is listed below.

„Various ink counter (I/C consumption counter, waste pad counter, etc.)

„Mechanical setting value (Head ID, Bi-D adjustment, USB ID, etc.)

Refer to 7.1.2 that provides the detailed information stored in EEPROM.

 

 

 

 

 

 

 

 

 

E01A37CB

 

+.3.3V

 

EEPROM-93C

 

 

 

 

(IC5)

 

 

 

(IC8)

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

 

 

 

VCC

CS

1

136

C-P20

 

 

 

 

 

 

 

 

 

 

 

7

 

NC

SK

2

135

C-P21

 

 

 

6

 

ORG

DI

3

134

C-P22

 

 

 

5

 

GND

DO

4

133

C-P23

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 2-29. EEPROM circuit diagram

EEPROM is connected to CPU with 4 lines and each line has the following function.

„

CS:

Chip selection signal

„

CK:

Data synchronism clock pulse

„

DI:

Data writing line (serial data) at power off.

„

DO:

Data reading line (serial data) at power on.

Operating Principles

Electrical Circuit Operating Principles

57