C367Main-B Board; Main Elements - Epson STYLUS COLOR 480 Service Manual

EPSON Stylus COLOR 480

2.2.2 C367MAIN-B Board

The printer mechanism is controlled by C367MAIN-B. On this MAIN board, 3.3V
regulator IC is not mounted and all IC is driven with 5.0 V.
See Figure for the C367MAIN-B board block diagram.
Figure 2-18. Block Diagram for the C367MAIN-B Board
Following shows you the major characteristic of this main board.
o
Timer IC & Lithium battery are not mounted
Unlike the previous products, the Timer IC and the Lithium battery are not
mounted on the Main board. So, this product perform the Power-on cleaning or
Timer cleaning based on the time command which is sent from the printer driver.
As for the detail, refer to the 2.1.7 Ink Sequence.
o
D-RAM
1Mbit D-RAM is mounted on the Main board.
o
One CPU controls the all function on the main board.
Operating Principles

2.2.2.1 Main elements

Table 2-8 shows the function of the each main elements on C367MAIN-B.
IC
CPU
E01A14NA
PROM
RAM
AT93C46
LA5623M
E09A17RA
LB1845
LB1845
74LS07
Electrical Circuit Operating Principles
Table 2-8. Main Elements
Location Function
16bit CPU mounted on the MAIN board is driven by
IC1
clock frequency 24MHz and controls the printer.
• Capacity 4MB, Bus= 16 bit
IC3
• Program for CPU
IC4 Bus= 16 bit, 1Mbit DRAM
1kbit EEPROM
IC5 • Default value setting
• Parameter backup
Reset IC
IC6 • For +5V; reset when +4.2V is detected
• For +42V, reset when +33.2 is detected
Head drive control HIC
IC7
• Generates head common voltage.
IC8 CR motor drive IC
IC9 PF motor drive IC
IC10 IEEE1284 parallel I/F transceiver IC.
Revision B
46