Epson TM-FX2180 manual Control Circuit Operation

EPSON FX-2180 Service Manual

The figure below shows the power supply circuit block diagram.

primary circuit secondary circuit

Chapter 2 Operating Principles

AC input

filter circuit	full-wave	smoothing	switching
	rectification
		circuit	circuit
	circuit

C244 PSH only

photo-

voltagecoupler doubler

rectification automatic switching circuit

photo- coupler

+5 V switching	+5 VDC
regulator

+5 V constant voltage control circuit

+5 V over-current protection circuit

smoothing	+35 VDC
circuit
+35 V line	CPU
overload	port 20
detector circuit
+35 V line
constant voltage
control circuit
+35 V line
over-voltage
protection circuit
+5 V line
over-voltage
protection circuit
+35 V line
over-current
protection circuit	Operate
	(power) button

Q2-Q19	print head
print head	temperature
driver	sensor

type B I/F	IC5	EPROM	IC3 PS-RAM
			or SRAM

				+35 V voltage
				sensor
parallel I/F				rear PE
				sensor
control panel	IC1
buttons & LEDs	gate array		IC2	front PE
Operate button	E05B50**		CPU	sensor
		IC8
		serial	TMP96C141BF	TOP
		EEPROM
				sensor
		IC15		home
		reset IC		position
				sensor
PSC
PWDN				paper
				release
	5 V			lever sensor
	GL			platen gap
	35 V
	GP			lever
				sensor

Figure 2-2. Power Supply Circuit Block Diagram

2.1.3 Control Circuit

The printer’s control circuit consists of the C244 MAIN control board and the control panel board.

2.1.3.1Control Circuit Operation

The control circuit includes a TMP96C141BF CPU that runs at 17.20 MHz, an E05B50** gate array, a 2 Mbit PROM (or 2 Mbit / 4 Mbit flash ROM), a 1 Mbit / 4 Mbit PS-RAM (or SRAM), a serial (or parallel) EEPROM, and other circuits. The control circuit controls all the printer’s components. Figure 2-3 shows the control circuit block diagram.

power supply	IC12	IC9
	PF driver	CR driver	CSF driver	CSF
board	UDN2917EB	SLA7024M		sensor
				: data bus
				: address bus

Figure 2-3. Control Circuit Block Diagram

2-3