Service manual

EPSON Stylus COLOR 480 Revision B
Operating Principles Electrical Circuit Operating Principles 46
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.
2.2.2.1 Main elements
Table 2-8 shows the function of the each main elements on C367MAIN-B.
Address
Data
CR2
R e s e t IC
(IC 6 )
EEPROM
(IC 5 )
C N 6 P a r a lle l I/F
Q 1 & Q 2
CN4
PF M otor
CR Motor
C N 3
P-RO M 4M
(IC 3 )
Head
E01A 14N A
CPU (IC 1)
M o to r D riv e r
(IC 8 )
M o to r D riv e r
(IC 9 )
CN 2
Com m on Driver
( IC 7 )
D-RAM 1M
(IC 4 )
P a r a lle l I/F IC
(IC 1 0 )
CN 1
H P /P E /IC S e n
Table 2-8. Main Elements
IC Location Function
CPU
E01A14NA
IC1
16bit CPU mounted on the MAIN board is driven by
clock frequency 24MHz and controls the printer.
PROM IC3
• Capacity 4MB, Bus= 16 bit
• Program for CPU
RAM IC4 Bus= 16 bit, 1Mbit DRAM
AT93C46 IC5
1kbit EEPROM
• Default value setting
• Parameter backup
LA5623M IC6
Reset IC
• For +5V; reset when +4.2V is detected
• For +42V, reset when +33.2 is detected
E09A17RA IC7
Head drive control HIC
• Generates head common voltage.
LB1845 IC8 CR motor drive IC
LB1845 IC9 PF motor drive IC
74LS07 IC10 IEEE1284 parallel I/F transceiver IC.