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EPSON Stylus PHOTO 810/820/830 Revision B
Operating Principles Electrical Circuit Operating Principles 47
2.2.2
C417/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
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 2-18 for the 418 Main board block diagram.
Figure 2-18. Block diagram for the C418 Main/Main-B board
5VDC 3.3VDC
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)
P-ROM
(SOJ) 8M
(IC5)
Address
Data
D-RAM 4M
(IC4)
E01A21CB
ASIC (IC1)
Reset IC
(IC2)
EEPROM
(IC3)
Motor driver
(IC10)
Motor driver
(IC11)
Common
driver (IC19)
Parallel I/F IC
(IC7)
Q2&Q3
CN3
USB
CN4
CN7
CN12
CN9
CN8
CN1 Parallel I/F
Printhead
PF motor
CR motor
HP/PE sensor
CR2