Sangean U3 Service Manual

U3
AM/FM 2 BANDS
DIGITAL TUNING RADIO RECEIVER
CONTENTS
Specification ………………………………………………………………………………………………………2-4
Block Diagram ………………………………………………………………………………………………………5
Alignment Instructions………………………………………………………………………………………………6-10
Test Points Diagram…………………………………………………………………………….……….……………11
Main PCB Top View…………………………………………………………………………….……….……………12
Main PCB Bottom View.………………………………………………………………………….……..………..…..13
Control PCB Top View……………………………………………………………………………….………….……14
Control PCB Bottom View……………………………………………………………………………………………15
Power PCB View…………….………………………………………………………………………………………16
Wiring Diagram..….………………………………………….………………….….……………..……….17
Troubleshooting Flow Chart..….………………………………………….……………….….……………..……18-19
Electrical Parts List………………………………………………………………………………....……………20-23
Mechanical Parts List…………………………………………………………………….………….…………….24-25
Exploded Views.…………………………………………………………………………….…………….……………26
IC Circuit Block Diagram…………………………………………..…………….………………………………27-32
IC and Transistor Voltage Chart….……………………………..…………………………….…………………33-37
Semiconductor Lead Identifications……………………………………………………………………..……..…38
Schematic Diagram………………………………………….……………………………………………………39

Sangean U3 Specifications

General

I/O ports	Earphone jack DC jack Aux-in jack + mic. jack
Audio system	stereo
Dimensions (WxDxH)	260 x 370 x 250 mm
Power requirements	6 x 1, 5 V
Radio type	Portable
Supported radio bands	AM, FM
Display type	LCD
Product color	Black, Blue
RMS rated power	5 W

Weight and Dimensions

Weight	4300 g