Epson DFX-8500 service manual Control Circuit Block Diagram

DFX-8500

Serial I/F

Level Converter (IC9)

EEPROM (IC11)

24.57MHz

(CRU1)

MAIN Board	Mechanism
CPU
TMP95C061	Cover Open
(IC2)
	Sensor`
HTMP	Printhead
	Temperature
PWIDTH	Paper Width
HFTMP	Head Fan
	Temperature

TXD/RXD	DRV Board
CRINS		CR Motor
		Insulation
RF	RF Motor	RF Motor
POFF	Drive Circuit

RAM

(IC14)

P-ROM

(IC5)

Optional

Type-B I/F

Card

PSB/PSE

Board

Option

Cutter

Panel Unit

IEEE1284 I/F

AB	PF	PF Motor	PF Motor
		Drive Circuit (IC2)
DB	HPSENS,
Control	HNSENS	DRV-B Board
		Printhead	Printhead 1/2
		Drive Circuit 1/2
	PFA	Printhead	Printhead 2/2
		Drive Circuit 2/2
	HD
DTR/CTS

				Current Monitoring	CR Motor		Interlock SW.
			CRCLM		Control & Drive
			CR		Circuit (IC1, IC3)		CR Motor
		G/A	ENCA,				CR Encoder
			ENCB
		E05B36			PG Motor			PG Motor
		(IC1)	PG
					Drive Circuit
								PG Home
			PGENCA,
								PG Encoder
		AB	PGENCB
								PE Signals
		DB				(Front, Rear, Top)
		Control						Paper Jam
Control &		CL,						Ribbon Jam
								Pull Tractor
Monitoring		PD,
		DRERR						Tractor Select
+37 VDC,
+5 VDC			PLG		Plunger Drive			Plunger
					Circuit
			FAN		Fan Drive
	19.55MHz							Fan
					Circuit
	(CRU2)
		LED,
		SW
Reset IC		RESET,			Head Fan			Head Fan
					Drive Circuit
(IC13)		RSTOUT,
		ERRCRPFX
		PDATA1-8,
		/STB,	SWCNT					SUB Board
		/ACK, BUSY SWITCH
								(DIP SWs)

Figure 2-15. Control Circuit Block Diagram

2-18 Rev. B