Epson DFX-8500 service manual Main IC Functions

OPERATING PRINCIPLES

Table 2-5 describes the functions of the main components on the C204 MAIN and C204 DRV board.

Table 2-5. Main IC Functions

Board	IC Name	Location	Functions
C204 MAIN	TMP95C061	IC2	Receives data from the host computer via the gate array, loads
	(CPU)		the data to the input buffer in the RAM, and converts the image
			data to print data.
	E05B36	IC1	The main features are:
	(Gate Array)		∙ /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
	PROM	IC5	Contains the program that runs the CPU.
	RAM	IC14	Holds the CPU working area and buffers (input,, line,, and
			image buffers).
	EEPROM	IC11	Memorizes the printer unique parameter during the power is off.
	ADM232	IC9	EIA to Logic level voltage level converter
	PST591D	IC13	System reset IC
C204 DRV	STK681-050	IC1	Drives the CR motor.
	STK67138MK4	IC2	Drives the PF motor.
	uPC393C	IC3	Detects the current in the CR motor driver and feeds it back to
			the gate array on the C204 MAIN board.

Rev. B 2-19