EPSON Stylus PHOTO 810/820/830

Revision B

2.2.3 C483/C484 MAIN-B Board

The logic circuit of the C483/C484 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/Regulator 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 these Main boards. So, these printers perform 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/C429 Main board generates 3.3VDC by pressuring down the 5VDC to drive several chips for the logic circuit.

Table 2-9. 3.3VDC drive chips & 5VDC drive chips

5VDC3.3VDC

†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

„ 4M/16Mbit D-RAM is mounted on the Main board.

†One ASIC controls the all functions on the Main board.

See figure 2-27 for the C483/484 Main-B board block diagram.

D-RAM 4M

Address

P-ROM

Reset IC

 

 

 

 

(SOJ) 4M

 

 

 

Data

(IC3)

 

 

 

(IC1/IC2)

(IC7)

 

 

 

 

 

 

EEPROM

 

 

 

 

 

 

(IC5)

 

 

 

 

 

 

 

 

CN4

HP/PE Sensor

 

E01A21CB

 

 

 

 

 

 

 

 

 

 

 

CPU (IC1)

 

 

 

CN7

PF Motor

 

 

 

Motor Driver

 

 

 

 

 

 

 

 

 

 

(IC6)

 

 

 

CR1

 

 

 

 

CN12

CR Motor

 

 

 

 

 

 

 

 

 

Common

Q1&Q2

CN9

Head

 

 

 

Driver (IC10)

 

 

 

 

 

 

 

 

 

 

 

CN8

 

CN3

 

 

Parallel I/F IC

 

CN1 Parallel I/F

 

USB

 

 

(IC4)

 

 

 

Figure 2-25. Block diagram for the C483/C484 Main-B board

Motor driver (IC6) Reset IC (IC3)

Parallel controller (IC4)

ASIC (IC8) D-RAM (IC1/IC2) P-ROM (IC7)

Parallel controller (IC4) Common driver (IC10) EEPROM (IC5)

Operating Principles

Electrical Circuit Operating Principles

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