Main Elements - Epson Stylus PHOTO 820 Service Manual

EPSON Stylus PHOTO 810/820

2.2.2.1 Main Elements

Table 2-8 shows the function of the each main elements on C418 Main/Maia-B board.
Table 2-8. Main elements
IC Location Function
CPU
CPU mounted on the MAIN board is driven by clock
E01A21CB IC1
frequency 48 MHz, 24MHz and controls the printer.
(E01A21CA)
DRAM IC4 Bus= 16 bit, 4Mbit DRAM
1kbit EEPROM
EEPROM IC3 • Default value setting
• Parameter backup
Reset IC
Reset IC
IC2 • For +5V; reset when +4.2V is detected
BN6150F-E2
• For +42V, reset when +36.3 V is detected
Head drive control HIC
Common Driver
IC19
E09A29LA
• Generates head common voltage.
Motor Driver
IC10/IC11 PF/CR motor drive IC
(LB1946-K)
Parallel I/F IC
IC7 IEEE1284 parallel I/F transceiver IC.
74LVX1612B4
Operating Principles Electrical Circuit Operating Principles
Revision A
46