Toshiba B-EV4 manual Description of the Main PC Board, Sdram

Page 16

2. ELECTRONICS SPECIFICATIONS

EO18-33025

2.3 Description of the Main PC Board

2.3 Description of the MAIN PC Board

This PC board, the brain of the printer, is comprised of the following components.

32bit RISC CPU (U2):	Type: AT91SAM9260
	The 32bit RISC CPU operates the following processing:
	Controlling the interfaces
	• Serial Interface (RS-232C)
	• Parallel Interface (Centronics)
	• Eternet (10BASET/100BASETX)
	Controlling the Status LED
	Detect the [Feed] key
	Controlling the read/write operation on the memory
	• Flash ROM
	• SDRAM
	• SD Card
	Controlling the options
	• Cutter Module
	• Strip Module
	Control and detect sensor statuses
	• Ribbon Sensor
	• Cover Open Sensor
	• Feed Gap Sensor
	• Black Mark Sensor
	• Motor Temperature Thermistor
	Controlling the Print Head
Flash ROM (U5):	Type: MX29LV320CBTC-70G
	Capacity: 32M bit
	The programmed data of the boot program, main program, C/G, writable
	character are written into the flash ROM.

SDRAM (U6):	Type: IS42S16400B-6TL
	Capacity: 64M bit
	It is used for drawing the print data and used as a work area.

2-3

Image 16

Contents EV4 Series Table of Contents Feature of the B-EV4D/EV4T Front ViewRear View InteriorEV4T Indication of the Model Name V 4 D G S 14 QM RBasic Specifications EV4D EV4TTUV External Media Holder B-EV904-PH-QM-R Key and LED Color StatusSupply Specifications Media TypeDetection Area of the Transmissive Sensor Detection Area of the Reflective SensorRibbon Figure below shows the effective print area on the mediaElectronic Specifications Block DiagramMain PC Board Layout U6 SdramDescription of the Main PC Board SdramDC/DC Converter U22 Type TS34063 JP2 SD Card Slot JP7 Serial Interface JP9 USB Type Type B Connector JP20 Ribbon End Sensor Print Head JP30 Replacing the Important Parts LubricationReplacing the Top Cover EV4T modelEV4D model Hook Media View Window Disconnect the connector from the feed button PC board Replacing the Lower Cover Replacing the Main PC Board Replacing the Important Parts Replacing the Platen Ass’y Replacing the Print Head Ass’y Remove the two screws which secure the print head ass’yConnector Print Head Ass’y Bracket Print Head Block Latch Top Inner Cover Remove the two pins which secure the print head ass’y Plate Replacing the Stepping Motor Lubrication Replacing the Gear Cover Replacing the Important Parts Replacing the Feed Button PC Board Replacing the Cover Open Sensor Replacing the Ribbon Sensor B-SV4T model only Replacing the Black Mark Sensor Remove the black mark sensorReplacing the Important Parts Replacing the Feed Gap Sensor Lower Replacing the Important Parts Replacing the Feed Gap Sensor Upper Remove the feed gap sensor upperReplacing the Important Parts Troubleshooting LED StatusPrint Quality Ribbon run out Loading the ribbonMaintenance Maintenance System Mode Abort of Label Format Auto Call Sensor Adjustment