EPSON Stylus PHOTO 810/820/830

Revision B

2.2.2C417/C418 Main/Main-B Board

The logic circuit of the C418 Main/Main-B board is composed of the follows;

„Logic line (ASIC, DRAM, P-ROM, EEPROM and so no)

„Motor control/drive circuit (CR motor/PF motor)

„Head control/drive circuit

„Interface control circuit (Parallel I/F, USB I/F)

„Sensor circuit

„Reset circuit

„EEPROM circuit

„Switch circuit

„LED circuit

The printer mechanism is controlled by the above circuits. Following explains the major characteristics of this Main board.

†Timer IC & Lithium battery are not mounted

Unlike the previous printer (Stylus COLOR 680), the Timer IC and the Lithium battery are not mounted on the Main board. So, this printer performs the Power-on cleaning or Timer cleaning based on the time command which is sent from the PC through the printer driver. As for the details, refer to 2.1.6

†Use of the 3.3V chips in the logic circuit

The 3.3V regulator (IC8) on the C418 Main/Main-B board generates 3.3VDC by pressuring down the 5VDC to drive several chips for the logic circuit.

Table 2-7. 3.3VDC drive chips & 5VDC drive chips

5VDC

3.3VDC

 

 

†Unlike the previous printer (Stylus COLOR 680), the panel board is eliminated and the switches/LED lights are mounted on the Main board.

†The transceiver with USB I/F is built in the CPU.

†D-RAM

4Mbit D-RAM is mounted on the Main board.

†One ASIC controls the all functions on the Main board. refer to Figure 2-18for the 418 Main board block diagram.

D-RAM 4M

Address

P-ROM

Reset IC

 

 

 

Data

(SOJ) 8M

(IC2)

 

 

 

(IC4)

 

 

 

 

(IC5)

 

 

 

 

 

 

 

 

 

 

 

 

 

EEPROM

 

 

 

 

 

 

(IC3)

 

 

 

 

E01A21CB

 

 

 

CN4

HP/PE sensor

 

ASIC (IC1)

 

Motor driver

 

 

 

 

 

 

 

CN7

PF motor

 

 

 

(IC10)

 

 

 

 

Motor driver

 

CN12

CR motor

CR2

 

 

(IC11)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Common

Q2&Q3

CN9

Printhead

 

 

 

driver (IC19)

 

 

 

 

 

 

 

 

CN8

 

CN3

 

 

Parallel I/F IC

 

CN1 Parallel I/F

 

USB

 

 

 

 

 

 

(IC7)

 

 

 

 

 

 

 

 

 

Figure 2-18. Block diagram for the C418 Main/Main-B board

Motor driver (IC10/11) Reset IC (IC2) EEPROM (IC3) Parallel controller (IC7)

ASIC (IC1) D-RAM (IC4) P-ROM (IC5)

Parallel controller (IC7) Common driver (IC19)

Operating Principles

Electrical Circuit Operating Principles

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