Sangean U-3 User 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

SPECIFICATION .
FM. ELECTRICAL PERFORMANCE
Model: U3 (EUR) Brand: SANGEAN Temp: 25 ℃R. H. : 75 % Date:2006/2/20
Condition Value Test No.
Test Item Input Output freq Nom. Lim. 1. 2. Unit
S/N=6dB Min 87.5 ±0.1
Tuning Range S/N=6dB Max 108 ±0.1
MHz
Intermediate freq. S/N=6dB 10.7
±0.1
MHz
90 6 12
98 6 12
Max. Sensitivity S/N=6dB 106 6 12
dBμ
90 12 22
98 12 22
Usable Sensitivity S/N=30dB 106 12 22 dBμ
Image Rejection 127.4MHz R.O. 106 32 26
dB
I.F. Rejection 10.7MHz S/N=6dB 90MHz 60 50 dB
3db Limiting(1mV) 98MHz 10 16 dBμ
Min. output 60dBμ98MHz 1 3
mv
Auto Tuning Stop Sens. 98MHz 22 28 dBμ
Current consumption 60dBμ98MHz 190 210 mA
TONE ATT 10K
Rated
output
98MHz 10 8
dB
S/N Ratio 60dBμDIN Audio 98MHz 46 40 dB
Am. suppression 60dBμ98MHz 46 30
dB
Speaker8Ω
AC/DC 98MHz 7/4.5 6/3.5 W
Mod75kHz
**Output Power 100Hz Load 32Ω10% THD 5+5 2+2 mW
T.H.D. (45KHz dev.) R.O. 98MHz 1 3 %
Over load capacity 10% THD 98MHz >106
dBμ
LOW BATT. 98MHz 5.4 6.0 V
100 LOW 10 7
Audio Fidelity(1K=0dB)
(W/Pre-emphasis)50uS
10K HIGH 4 1
dB
Supply Voltage: AC 230V/50Hz
DC9V R.O：50mW Load: 8 Ohm Modulation: Dev.22.5kHz 1KHz
Remark: output with 1kHz Filter
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SPECIFICATION .
MW ELECTRICAL PERFORMANCE
Model: U3(EUR) Brand: SANGEAN Temp: 25 ℃R. H. : 75 % Date:2006/2/20
Condition Value Test No.
Test Item Input Output Freq. Nom. Lim. 1. 2. Unit
S/N=6dB Min. 522 ±1
Tuning Range S/N=6dB Max. 1629 ±1
kHz
Intermediate freq. S/N=6dB 455
±1
kHz
603 kHz 46 56
999 kHz 44 54
Max. Sensitivity S/N=6dB 1404kHz 44 54
dBμ/m
603 kHz 56 62
999 kHz 54 60
Usable Sensitivity S/N=20dB 1404kHz 54 60
dBμ/m
Image Rejection S/N=6dB 1404kHz 36 30
dB
I. F. Rejection (450KHz) S/N=6dB 603 kHz 60 50
dB
Selectivity(±10KHz) S/N=6dB 1404kHz 50 40
dB
Bandwidth(-6dB) S/N=6dB 7 +-3
KHz
T. H. D. ( 5mV ) R.O 2 4 %
Auto Tuning Stop Sens. 54 60 dBμ/m
S/N Ratio (RF 5mV) 38 32
dB
Current Consumption R.O 190 210 mA
40 100 Hz
Audiofidelity
(-6dB) 1K=0dB 3.5 2
KHz
**Output power Mod 80%
at100Hz AC
94dBμ/m 10%THD 7 6
W
Over Load Capacity 80% 10%THD 100 >90
dBμ/m
LOW BATT. 5.4 6.0 V
A. G. C. F. O. M. 100dBμ/m
999kHz
50 40
dB
Whistle Modulation(5mV/M) 74dBμ/m 2IF/3IF <15
%
Supply Voltage: AC 230 V/50Hz
DC9V
R.O：50mW Load: 8 Ohm Modulation: Dev.30% 1KHz
Remark: output with 1kHz Filter
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SPECIFICATION .
AUX-IN ELECTRICAL PERFORMANCE
Model: U3 (EUR) Brand: ALL Temp: 25 ℃R. H. : 75 % Date:2005/12/23
Condition Value Test No.
Test Item Input Output Freq. Nom. Lim. 1. 2. Unit
Output Power AUX IN=0.5V/100Hz AC
THD=10% 7 6
W
AUX IN
Dynamic Range
Output=R.0 (ATT=0)
THD=3%
AUX IN=100Hz 1 0.5
Vrms
I/S (Input Sensitivity) AUX IX=100Hz，ATT=0
OUT=0.5W
Volume=MAX 100 ±30 mV
DISTORTION AUX IN =I/S 1KHz
OUT=R.O 0.1 0.4 %
MIN OUTPUT AUX IN =I/S 1KHz
Volume=MIN 1 3
mV
S/N RATIO AUX IN =I/S 1KHz&GND
OUT=R.O 60 50
dB
100 10 6
Frequency Response AUX IN=0.5V/1KHz
OUT=50mW=0dB 10K 8 4
dB
Remark: output with 1kHz Filter
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LCD
U-COM TC9318AF AG
KEY BACK LIGH
T
KEY TONE&HWS BUZZER RESET HOLD
5V JACK
REG 3V
DC/DC IND
DC/DC SW
DC/DC 5V
REG 9V
AC ADAP. BATT.
MAIN AMP TDA7266L
EQ IC5
VR
SWITCH
AUX IN
AUX JACK
REG 6V
REG 9V
DC/DC15V
6V DET
FM OSC AMP LPF
BATT DET
TUNNER TA2099N/F
AM OSC AM
ANT
FM OSC
IF
OSC BUFFER
IF FILTER
IF AMP
FM ANT
FM FRON END
POWER SW
TUNER SW
MUTE
BLOCK DIAGRAM
5

ALIGNMENT INSTRUCTIONS
1. ALIGNMENT FOR AM
a. Required Instruments:
AM IF Sweep Generator with scope
b. Alignment Procedure
Mode Adjustment Procedure
(1) Press the power button to turn on the radio.
(2) Connect the input terminal of AM IF sweep generator in series with a resistor of 1.2KΩ
to the C28 positive and TP14.
(3) Connect the RF output terminal of AM IF sweep generator to another test point TP3.
(4) Connect a 100μF electrolytic capacitor to test point TP14 and theC28 positive .
(5) Adjust T3 to have a max. output with a marker frequency of 450 kHz on the sweep
AM T3
scope.
c. Instrument Connection
T3
C28+ TP14
100uF
IN
TP1 RF TP3
TP14
OUT
450KHz Marker
1.2KΩ2.2KΩ
AM IF Sweep Generator
6

2. ALIGNMENT FOR AM TUNING VOLTAGE RANGE
a. Required Instruments:
DVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Turn on the radio.
(2) Connect the probe of DVM to the test point TP19 and TP14.
(3) Tune the AM frequency to 520 kHz.
(4) Adjust L3 to have a reading of 1.2 ±0.2V.
(5) Tune the AM frequency to 1710kHz.
AM
L3
TC3
(6) Adjust TC3 to have a reading of 8.2 ±0.2V.
c. Instrument Connection
L3
TC3
TP14
TP19
DVM
7

3. ALIGNMENT FOR FM TUNING VOLTAGE
a. Required Instruments
DVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Turn on the radio.
(2) Connect the probe of DVM to the TP19 and TP14
(3) Tune the FM frequency to 108MHz.
FM L2
(4) Adjust L2 to have a reading of 8.2V ±0.2V.
(5) Tune the FM frequency to 87.5MHz.,check and have a reading of 1.9V ±0.2V
c. Instrument Connection
L2
TP14
TP19
DVM
8

4. ALIGNMENT FOR AM SENSITIVITY
a. Required Instruments
AM Signal Generator
SSVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Turn on the radio.
(2) Connect a SSVM to the speaker TP8 and TP9 terminals.
(3) Connect an AM signal generator together with standard loop dummy antenna and
feed 30% modulated signal to the AM ferrite
(4) Tune the generator frequency to 1404 kHz.
(5) Tune the AM frequency to 1404 kHz and adjust TC2 to have a max reading on
SSVM.
(6) Return the generator frequency to 603 kHz.
(7) Tune the AM frequency to 603 kHz and adjust bar antenna to have a max reading on
SSVM.
AM TC2
Bar Antenna
(8) Repeat (4) to (7) as necessary to minimize tracking error.
c. Instrument Connection
L8 L7
TC2
60 cm
The radio is located
perpendicularly to
the Loop Antenna
Loop Antenna
AM Signal Generator
TP9
TP8
DVM
9

5. ALIGNMENT FOR FM TUNING SENSITIVITY
a. Required Instruments
FM Signal Generator (frequency range up to 220 MHz)
SSVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Turn on radio.
(2) Connect a SSVM to speaker TP8 and TP9.
(3) Connect a FM signal generator to TP2 and TP1.
(4) Set the signal generator to 22.5 kHz deviation with 1 kHz modulation.
(5) Always tune the generator frequency to exactly same as the radio band frequency
before adjustment.
(6) Tune the FM frequency to 106MHz and adjust TC1to have a max audio output.
(7) Tune the FM frequency to 90MHz and adjust L1 to have a max audio output.
FM
TC1
L1
(8) Repeat (6) to (7) as necessary to minimize tracking error.
c. Instrument Connection
TC1L1
TP1
TP2
SSG
TP9
TP8
DVM
10