Main Elements - Epson Stylus Color C70 Service Manual

EPSON Stylus COLOR C70/C80

2.2.2.1 Main elements

Table 2-6, Table 2-7 shows the function of the each main elements on C424 MAIN-B.
Table 2-6. Main Elements of the C424 MAIN-B (Stylus COLOR C70)
IC Location
CPU-ASIC 2 in 1 8KB CPU mounted on the MAIN board is driven by
IC7
E01A27CA clock frequency 24MHz and controls the printer.
• Capacity 8Mbit(Version : THDXX), Bus = 16bit
PROM IC2
• Program and CG for CPU (G: 2 characters)
DRAM IC5 Bus = 16bit, 4Mbit DRAM
2kbit EEPROM
• Default value setting
EEPROM IC18
• Parameter backup
• For displaying raster data
Reset IC
• For +3.3V; reset when +2.5V is detected
Reset IC IC1
• For +5V ; reset when +4.2V is detected
• For +42V ; reset when +36.7V is detected
Head drive control HIC
Common
IC13
Pre-Driver
• Generates head common voltage.
Motor Driver IC8 CR/PF motor drive IC
Parallel I/F IC IC4 IEEE1284 parallel I/F transceiver IC.
Operating Principles
Function
Electrical Circuit Operating Principles
Table 2-7. Main Elements of the C424 MAIN-B (Stylus COLOR C80)
IC Location
CPU-ASIC 2 in 1 8KB CPU mounted on the MAIN board is driven by
IC7
E01A27CA clock frequency 24MHz and controls the printer.
• Capacity 8Mbit(Version : THEXX), Bus = 16bit
PROM IC2
• Program and CG for CPU (CG: 38 charactors)
DRAM IC3 Bus = 16bit, 16Mbit DRAM
[RTC]
Electric double layer condenser
[Reset]
• For +3.3V; reset when +2.5V is detected
• For +5V ; reset when +4.2V is detected
HIC IC6
• For Power; reset when +36.0V is detected
[EEPROM]
2kbit EEPROM
• Default value setting
• Parameter backup
Head drive control HIC
Common
IC13
Pre-Driver
• Generates head common voltage.
Motor Driver IC8 CR/PF motor drive IC
Parallel I/F IC IC4 IEEE1284 parallel I/F transceiver IC
Revision A
Function
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