Sangean WFR-20 User manual

WFR-20
Wi-Fi Internet Radio
CONTENTS
Specification ………………………………………………………………………………………………………2
Block Diagram ………………………………………………………………………………………………………3
Main PCB Top View…………………………………………………………………………….……….……………4
Main PCB Bottom View.………………………………………………………………………….……..………..…..5
Control PCB Top View…………………………………………………………………………….……….……………6
Control PCB Bottom View.………………………………………………………………………….……..………..…7
Wiring Diagram..….………………………………………….………………….….……………..………….8
Troubleshooting Flow Chart..….………………………………………….……………….….……………..…….9-12
Electrical Parts List………………………………………………………………………………....……………13-15
Mechanical Parts List……………………………………………………………………….………….…………….16
Exploded Views.…………………………………………………………………………….…………….……………17
IC Circuit Block Diagram…………………………………………..…………….………………………………18-21
IC and Transistor Voltage Chart….……………………………..…………………………….…………………22-25
Semiconductor Lead Identifications……………………………………………………………………..……..…26
Main Schematic Diagram………………………………………….………………………………………………27
Control Schematic Diagram……………………………………….…………………………………………………28

Specification
AUX-IN & LINE OUT ELECTRICAL PERFORMANCE
Model: WM201 Brand: ROBERTS Temp: 25 ℃R. H. : 75 % Date:2007/6/14
Condition Value Test No.
Test Item Input Output Freq. Nom. Lim. 1. 2. Unit
4.5 3.5 W
Output Power SP/HP AUX IN= 1V/100Hz
THD=10% 2.8 2
mW
AUX IN
Dynamic Range
Output=R.0 (ATT=0)
THD=3%
AUX IN=1K 1 0.5 V
I/S (Input Sensitivity) AUX IN=100Hz，ATT=0
THD=10%
Volume=MAX 200 ±50 mV
0.1 0.4
DISTORTION SP/HP AUX IN =I/S 1KHz
OUT=50mW/1mW 0.1 0.4 %
0.2 1
MIN OUTPUT SP/HP AUX IN = GND
Volume= 1step 0.1 0.5 mV
S/N RATIO AUX IN =I/S 1KHz&GND
OUT=R.O with 20kHz LPF 65 55 dB
100 8 5
Frequency Response AUX IN=I/S/1KHz
OUT=50mW=0dB 10K 8 5
dB
LINE OUT LEVEL
(REC OUT IMPD=10K) MP3 1KHz 128kbps 1000 ±80 mV
LINE OUT S/N
(REC OUT IMPD=10K) MP3 1KHz 128kbps with 20kHz LPF 65 55 dB
LINE OUT THD MP3 1KHz 128kbps 0.1 0.4 %
MP3 1KHz 128kbps 65 55 dB
Channel Separation
with 20kHz LPF AUX IN=I/S/1KHz 65 55 dB
127Hz 0 ±2
LINE OUT Frequency Response 10007Hz 0 ±2 dB
Supply Voltage: AC230V/50Hz SP/HP R.O.: 50mW/1mW Load: 8/32 Ohm Modulation:
1KHz/30% Mod
Remark:
( )首件產品 ( )客戶抽測:
( )成品 ( )例行抽測 ( )業務樣品:
( )半成品 ( )新機種 ( )工程變更:
Approved by Released/Tested by
2

BLOCK DIAGRAM
3

MAIN PCB TOP VIEW
4

MAIN PCB BOTTOM VIEW
5

CONTROL PCB TOP VIEW
6

CONTROL PCB BOTTOM VIEW
7

WIRING DIAGRAM
8

TROUBLESHOOTING FLOW CHART
( 1 ) Power can not be turned on
Yes
Check EN301.
Check whether the pin 36 of IC4
is 3.3V DC.
No
Yes
Check whether the pin 2 of CN1 is
3.3V DC.
Check whether the pin 2 of J302 is
3.3V DC.
No Yes
Check whether the pin 3 of IC2 is
3.3V DC.
Check IC304.
No
Check T1.
( 2 ) Wireless does not work
Yes
Check whether the wireless adaptor
can normally work.
Check whether the wired is selected
or inserted.
No
Yes
Check whether the pin1 of W301 is
about 5V DC
Check whether module1 can work
normally.
No
Yes
Check whether the pin4 of W305 is
5V DC.
Check Q303, Q306.
No
No
Check T1.
Check whether the pin3 of IC1 is
5V DC.
9

( 3 ) Wired does not work
Yes
Check whether JK5 (RJ45 jack) can
normally work.
Check whether IC5 can normally
work.
No
Yes
change JK5(RJ45 jack).
Check whether the pin37&39 of IC4
transmit correct data.
No
Yes
Check whether the W302 circuit can
normally work.
Check Q303, Q306 circuit.
No
Check whether J302 can normally
work, especially pin 24, 26.
No
No
Check whether IIS circuit can
normally work.
Check whether wireless is selected
for software.
Yes
Check whether wireless is selected.
10