Toshiba B-EV4 manual DC/DC Converter U22 Type TS34063

Page 17

2. ELECTRONICS SPECIFICATIONS

EO18-33025

2.3 Description of the Main PC Board

DC/DC Converter (U22, 23):	Type: TS34063
	It generates the voltages (+5V, +3.3V) from the power supply voltage
	(AC adapter).
	+5V and +3.3V are used as the operating voltage for each circuit.

Eternet Transceiver (U8):	Type: DM9161
	This IC is used for controlling the Ethernet (10BASET/10BASETX).

Regulator (U24, U33):	Type: TS68N28CX5, TS9007DCX
	It generates the voltages (+1.8) from the DC/DC converter voltage
	(+3.3V).

Stepping Motor Driver (U18, U19): Type: PBL3717

This IC is used for controlling the Stepping Motor.

Serial Interface Controller (U12): Type: SP3232ECY

This IC is used for controlling the Serial Interface (RS-232C).

Reset detect circuit (U25):	Type: TS358
	This IC is single supply dual operation amplifiers.
	It detects the voltage depression from +24V and +3.3V and outputs the
	Power Down signal to the CPU.

2-4

Image 17

Contents EV4 Series Table of Contents Front View Feature of the B-EV4D/EV4TInterior Rear ViewEV4T V 4 D G S 14 QM R Indication of the Model NameEV4D EV4T Basic SpecificationsTUV External Media Holder B-EV904-PH-QM-R Color Status Key and LEDMedia Type Supply SpecificationsDetection Area of the Reflective Sensor Detection Area of the Transmissive SensorFigure below shows the effective print area on the media RibbonBlock Diagram Electronic SpecificationsU6 Sdram Main PC Board LayoutSdram Description of the Main PC BoardDC/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 Lubrication Replacing the Important PartsEV4T model Replacing the Top CoverEV4D 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 Remove the two screws which secure the print head ass’y Replacing 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 Remove the black mark sensor Replacing the Black Mark SensorReplacing the Important Parts Replacing the Feed Gap Sensor Lower Replacing the Important Parts Remove the feed gap sensor upper Replacing the Feed Gap Sensor UpperReplacing the Important Parts LED Status TroubleshootingRibbon run out Loading the ribbon Print QualityMaintenance Maintenance System Mode Abort of Label Format Auto Call Sensor Adjustment

DC/DC Converter (U22, 23):

Type: TS34063