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.
IC
CPU
Gate Array
Rev. A
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Figure 2-16. C202 MAIN Board Block Diagram
Table 2-11. Allocated Functions for the CPU and the Gate Array
Location
IC1
IC2
Function
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.
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.
Counts dot numbers used for printing.
Controls voltages for EEPROM, control panel,
timers, and heads.
Operating Principles
2-15