Epson DFX-8500 Service Manual page 73

Table 2-5 describes the functions of the main components on the C204 MAIN and C204 DRV board.
Board IC Name
C204 MAIN TMP95C061
(CPU)
E05B36
(Gate Array)
PROM
RAM
EEPROM
ADM232
PST591D
C204 DRV STK681-050
STK67138MK4
uPC393C
Rev. B
Table 2-5. Main IC Functions
Location Functions
IC2 Receives data from the host computer via the gate array, loads
the data to the input buffer in the RAM, and converts the image
data to print data.
IC1 The main features are:
/CS (Chip Select) signal creation
Address decoding
Address latching
Clock pulse creation
Printhead driver control
CR motor driver control
CR and PG motor pulse encoder I/O (input/output)
Encoder pulse I/O
Phase signal creation for the motors
I/O port control
Interface control
Abnormal CR and PF motor detection
/RESET signal creation
IC5 Contains the program that runs the CPU.
IC14 Holds the CPU working area and buffers (input,, line,, and
image buffers).
IC11 Memorizes the printer unique parameter during the power is off.
IC9 EIA to Logic level voltage level converter
IC13 System reset IC
IC1 Drives the CR motor.
IC2 Drives the PF motor.
IC3 Detects the current in the CR motor driver and feeds it back to
the gate array on the C204 MAIN board.
OPERATING PRINCIPLES
2-19