Service manual

EPSON Stylus &2/25 1520
Rev. A
2-1
8
2.3.2 C211 MAIN Control Board
This printer uses C211 MAIN for the main control circuit board. It consists of the following:
16-bit CPU C90A02CB (IC7) :Running at 19.66 MHz
2 gate arrays E05B33 (IC6) :Controls interfaces, motors and printheads.
E05B34 (IC5)
P-ROM, DRAM and MROM
Drivers :Produces common voltage for the motors and printheads.
Table 2-8 and Figure 2-19 show the allocated functions for major components and the main control circuit
block diagram, respectively.
IC Location Function
CPU IC7
16-bit CPU
Run at 19.66 MHz
Controls the printer at the gate arrays IC5 and IC6
according to the program in P-ROM.
Gate Array IC5
Controls the I/F for the control panel.
Controls the CR motor.
Detects the signals from the PE sensor, cover
open sensor and REL (Release) sensor.
Gate Array IC6 Controls the parallel I/F.
Controls the serial I/F.
Controls Type-B I/F.
Controls the PF motor.
Controls black and color heads.
Controls the HP sensor and DE sensor.
DRAM IC9 Manages buffers, work area in the CPU, and
stuck area.
DRAM IC10 For image buffer. Expansion
MROM IC13 24 Mbit
Manages C.G. (Character Generator).
P-ROM IC11 Equipped only for the European version.
P-ROM IC14 8Mbit
Printer control program
Manages C.G. (Character Generator).
EEPROM IC2 Stores values for the default settings and other
values.
Timer counter IC IC3 Manages timers for the ink system.
Common driver IC IC18 Produces common voltage for the black head.
Common driver IC IC19 Produces common voltage f or the color head.
Driver IC16 Drives the PF motor.
Driver IC17 Drives the CR motor.
Table 2-8. Location and function of the Major Components