C211 Main Control Board - Epson Stylus Color 1520 Service Manual

EPSON Stylus COLOR 1520
low, the transistors assume there is a short circuit and feed information to the primary circuit to stop the
switching FET operation.

2.3.2 C211 Main Control Board

This printer uses C211 MAIN for the main control circuit board. It consists of the following:
T
16-bit CPU C90A02CB (IC7)
T
2 gate arrays E05B33 (IC6)
E05B34 (IC5)
T
P-ROM, DRAM and MROM
T
Drivers
Table 2-8 and Figure 2-9 show the allocated functions for major components and the main control circuit
block diagram, respectively.
Table 2-8. Locations and Functions of the Major Components
IC
CPU
Gate Array
Gate Array
DRAM
DRAM
MROM
P-ROM
P-ROM
EEPROM
Timer counter IC
Common driver
IC
Common driver
IC
Driver
Driver
2-18
Runs at 19.66 MHz.
Control interfaces, motors and printheads.
Produce common voltage for the motors and printheads.
Location
Y
16-bit CPU
Y
Runs at 19.66 MHz.
Y
IC7 Controls the printer at the gate arrays IC5 and
IC6 according to the program in P-ROM.
Y
Controls the I/F for the control panel.
Y
IC5 Controls the CR motor.
Y
Detects signals from the PE sensor, cover open
sensor, and REL (Release) sensor.
Y
IC6 Controls the parallel I/F.
Y
Controls the serial I/F.
Y
Controls Type-B I/F.
Y
Controls the PF motor.
Y
Controls black and color printheads.
Y
Controls the HP sensor and DE sensor.
Y
IC9 Manages buffers, the work area in the CPU, and
the stack area.
Y
IC10 For the image buffer. Expansion.
Y
IC13 24 Mbit
Y
Manages the C.G. (Character Generator).
Y
IC11 Only in the European version.
Y
IC14 8Mbit
Y
Printer control program
Y
Manages the C.G. (Character Generator).
Y
IC2 Stores the default settings and other values.
Y
IC3 Manages ink system timers.
Y
IC18 Produces common voltage for the black
printhead.
Y
IC19 Produces common voltage for the color
printhead.
Y
IC16 Drives the PF motor.
Y
IC17 Drives the CR motor.
Function