C610 Main Board - Epson Stylus CX4100 Service Manual

EPSON Stylus CX4100/CX4200/CX4700/CX4800/DX4200/DX4800/DX4850

2.4.2 C610 Main Board

The logic circuit of the C610 Main Board is composed of the follows;
Logic line (CPU-ASIC 2 in 1, SDRAM, P-ROM and so on)
Motor control/drive circuit (CR Motor, PF Motor, Scanner Motor)
Head control/drive circuit
USB Interface control circuit
Sensor circuit
Combination circuit (RTC circuit, Reset circuit, EEPROM circuit)
The printer mechanism is controlled by the above circuits. Following explains the
major characteristics of this Main Board.
Lithium battery is not mounted
Adoption of 3.3V/1.5V drive logic circuit components
The 5V formed by the Combination Motor Driver (IC5) of C610 Main Board is
stepped down to 3.3V by the Regulator (IC6), and it is then used as drive voltage
for many elements. In addition, when SPC shifts to low power mode, the 3.3V that
was stepped down by the Regulator (IC6) is stepped down to 1.5V by the
Combination Motor Driver (IC5) and elements that had been driven by 3.3V are
driven by 1.5V for suppression of power consumption.
Table 2-8. 3.3V/1.5V & 5V Drive Components
5VDC
• RTC (IC4) • Flash ROM (IC1)
• Card ASIC(IC9)
• SDRAM (IC2)
OPERATING PRINCIPLES
3.3 VDC 3.3/1.5VDC
• CPU-ASIC (IC8)
• Motor driver (IC5)
• Common driver (IC7)
Electrical Circuit Operating Principles
2.4.2.1 Main Elements
Table 2-9 (p.80) shows the function of the each main elements on C610 Main Board.
Table 2-9. Main Elements
IC Location
16Mbit
Flash ROM IC1
• Firmware storage
SDRAM IC2 Bus= 16 bit, 128Mbit DRAM
• EEPROM
Default settings, backup for all parameters
RTC IC4
• Reset function
• Timer function
CPU mounted on the MAIN board is driven by clock
CPU-ASIC IC8 frequency 48 MHz, 96MHz and controls the printer and
scanner, SDRAM.
• CR/PF/Scanner motor drive IC
Motor Driver IC5 • Dropping 42V line to 5V
• Dropping 3.3V line to 1.5V
Regulator IC6 Dropping 5V line to 3.3V
Head drive control HIC
Common Driver IC7
• Generates head common voltage.
Analog data from the scanner unit is converted into
AD converter IC11
digital data.
Card ASIC * IC9 Control the Memory Card slot.
Note "*": Only for Stylus CX4700/CX4800/DX4800/DX4850.
Revision A
Function
80