C202 Main Control Board - Epson Stylus COLOR 800 Service Manual

2.3.2 C202 MAIN Control Board

C202 MAIN control board consists of the following:
„Logic circuits for PROM, DRAM, CPU, ASIC and EEPROM
„Motor control and driver circuits for CR motor, PF motor, and pump motor
„Head control/ driver circuit for the black and color heads
„Other circuits for the I/F (Parallel I/F, Mac serial. Type B I/F), sensors, RTC timers, and reset
Figure 2-16 shows the circuit block diagram for the main control board.
Table 2-11 shows the allocated functions for the CPU and the gate array.
Table 2-11. Allocated Functions for the CPU and the Gate Array
IC
CPU
Gate Array
Rev. A
Figure 2-16. C202 MAIN Board Block Diagram
Location
‰Sets the current value for each motor.
‰Outputs the driving trigger pulse for each motor.
‰Outputs the driving trigger pulse for each head
‰Outputs the system clock.
‰Inputs the resistance value for the thermistor.
IC1
‰Inputs the On/Off signal of installation status for
each cartridge.
‰Transfers received data from I/F to DRAM
‰Controls interruption signals
‰Controls the motor drivers.
‰Controls printing data for each head.
‰Controls data from I/F and transfers it to the CPU.
‰Outputs head driver control pulses.
IC2
‰Counts dot numbers used for printing.
‰Controls voltages for EEPROM, control panel,
timers, and heads.
Operating Principles
Function
2-15