Download Sangean U-2 service Manual

U2
AM/FM-STEREO
2 BANDS RADIO RECEIVER
CONTENTS
Specification ………………………………………………………………………………………………………2-3
Block Diagram ………………………………………………………………….………………………..……………..4
Alignment Instructions…………………………………………………………………….……….………….…...2-10
Test Points diagram………….……………………………………………………………….……….………….…...11
Main PCB Top View…………………………………………………………………………….……….……………12
Main PCB Bottom View.………………………………………………………………………….……..………..…..13
Wiring Diagram..….………………………………………….………………….….……………..……………14
Troubleshooting Flow Chart..….………………………………………….……………….….……………..……15-16
Electrical Parts List………………………………………………………………………………....……………17-19
Mechanical Parts List……………………………………………………………………….………….………….20-21
Exploded Views.…………………………………………………………………………….…………….……………22
IC Circuit Block Diagram…………………………………………..…………….………………………………23-25
IC and Transistor Voltage Chart….……………………………..…………………………….…………………26-27
Semiconductor Lead Identifications……………………………………………………………………..……..…28
Schematic Diagram………………………………………….………………………………………………………..29
1
SPECIFICATION
FM.
Model: U2
ELECTRICAL
Brand: SANGEAN/ROBERTS
Temp:
Condition
Input
Output
Test Item
PERFORMANCE
25
Tuning Range
R. H. : 75 %
freq
Min
Max
Intermediate freq.
Max. Sensitivity
S/N=6dB
Usable Sensitivity
S/N=30dB
Image Rejection
127.4MHz
R.O.
I.F. Rejection
10.7MHz
S/N=6dB
3db Limiting(1mV)
Min. output
Tuning Ind. Sens.
Current consumption
AFC action range
Stereo separation (1KHz)
headphone
Stereo sensitivity
headphone
60dB
60dB
60dB
Rated
output
Spurious rejection103.35MHz 60dB
S/N Ratio
Am. suppression
60dB
Mod 75kHz
**Output Power 1kHz
Speaker 4
DIN Audio
60dB
Mod 22.5kHz
**Output Power 1kHz
T.H.D. (75KHz dev.)
Load 32
RL:4
10% THD
VOL
MAX.
Calibration
Audio Fidelity –3dB
(W/Pre-emphasis)
De-emphasis
50uSec
Bass booster action 1KHz
VOLUME AT CENTER
POSITION
80Hz
30Hz
Supply Voltage: DC 6V
emark:
( )
( )
( )
( )
( )
R. O. :50 mW
Test No.
1
2
3
Unit
MHz
MHz
dB
dB
dB
90MHz
60
50
98MHz
18
24
98MHz
98MHz
98MHz
98MHz
98MHz
3
18
150
500
28
5
24
180
200
22
28
98MHz
60
50
dB
98MHz
98MHz
98MHz
46
36
2.0
8+8
40
30
1.8
5+5
dB
98MHz
10% THD
*Lowest Batt. volt. LED OFFĺ ON 60dB
Value
Nom.
Lim.
87
+-0.2
108.5
+-0.3
10.7
+-0.1
12
18
12
18
12
18
18
24
18
24
18
24
32
26
dB
dB
mv
dB
mA
kHz
22
dB
dB
dB
W
mW
98MHz
1mV
Over load capacity
90
98
106
90
98
106
106
Date: 2003/9/9
98MHz
90M
98M
106M
R.O
LOW
HIGH
Load: 4 Ohm
mW
1
2
>106
2
dB
+-1000
KHz
4.0
4.2
35
75
15k
12k
3
+14
3
-6
Modulation: Dev.22.5kHz
V
Approved
( )
( )
( )
%
by
Hz
dB
@1kHz
Released/Tested by
MW
Model: U2(ATR-1)
ELECTRICAL
PERFORMANCE
Temp: 25
Brand: COMMON
R. H. : 75
Condition
Test Item
Input
Output
Value
Test No.
Lim.
Min.
515
+-7
Max.
1730
+-20
455
+-3
600 kHz
48
52
S/N=6dB 1000 kHz
46
50
1400kHz
46
50
600 kHz
52
58
1000 kHz
50
56
1400kHz
50
56
1000kHz
36
30
dB
S/N=20dB
1
2
3
Unit
Nom.
Intermediate freq.
Usable Sensitivity
Date: 2003/9/9
Freq.
Tuning Range
Max. Sensitivity
%
kHz
kHz
dB
dB
Image Rejection
S/N=6dB
I. F. Rejection (450KHz)
Selectivity( 10KHz)
S/N=6dB
60
50
dB
S/N=6dB
32
26
dB
7
+-3
KHz
R.O
2
4
%
R.O
4
4.2
V
Bandwidth(-6dB)
T. H. D.
( 5mV )
*Lowest Batt. Volt. LED OFFĺ
Tuning Ind. Sens.
56
S/N Ratio
(RF 5mV)
Current Consumption
74dB
/m
74dB
/m
Audio fidelity
(-6dB)
1000kHz
R.O
**Output power Mod 80% 74dB /m 10%THD
Over Load Capacity
80% Mod 10%THD
A. G. C. F. O. M.
100 dB
dB
170
mA
<100
Hz
>2.5
KHz
2
1.8
W
100
>90
140
600
+-50
1000
+-80
1400
+-60
Load: 4 Ohm
)
(
)
(
)
(
)
(
)
(
)
(
)
(
)
KHz
3
%
Modulation: Dev.30% @1kHz
Approved
by
/m
dB
<15
Remark:
(
dB
>50
Whistle Modulation(5mV/M)
R. O. : 50 mW
/m
32
/m
Calibration
Supply Voltage: DC 6 V
dB
Released/Tested by
BLOCK DIAGRAM
4
ALIGNMENT INSTRUCTIONS
(1) ALIGNMENT FOR AM IF
a. Required Instruments
AM IF Sweep Generator with Scope
b. Alignment Procedure
Mode
Adjustment
AM
T4
Procedure
(1) Turn on the radio.
(2) Connect the input of the AM IF sweep generation in series with a resister of 1.2K
Ohm to the test point TP2 and TP7.
(3) Connect the RF output of the AM IF sweep generation in series with a resister of
2.2K ohm to another test point TP3.
(4) Adjust T4 to have a max. output and best center marker frequency to 455kHz.
c. Instrument Connection
T4
Test Point 455KHz Marker Test Point
TP3
TP2
103pF
IN
RF
OUT
1.2Kȍ
2.2Kȍ
AM IF Sweep Generator
5
(2) ALIGNMENT FOR FM IF
a. Required Instruments
FM IF Sweep Generator with Scope
b. Alignment Procedure
Mode
Adjustment
FM
T1
T3
Procedure
(1) Turn on the radio.
(2) Connect the input of the FM IF sweep generation in series with a resister of 1.2k
Ohm to the test point TP4 and TP7.
(3) Connect the RF output of the FM IF sweep generation in series with a resister of
2.2k ohm to another test point TP5.
(4) Adjust T3 make curve with respect to the Center marker frequency of 10.7MHz.
(5) Adjust T1 have a max.
c. Instrument Connection
T1
T3
Test Point 10.7MHz Marker Test Point
TP5
TP4
103pF
103pF
RF
OUT
IN
1.2Kȍ
2.2Kȍ
FM IF Sweep Generator
6
(3) ALIGNMENT FOR FM SENSITIVITY
a. Required Instruments
FM Signal Generator
SSVM
b. Alignment Procedure
Mode
Adjustment
L2
TC2
Procedure
(1) Set the power switch to ON.
(2) Connect a SSVM to the test point TP8 and TP9.
(3) Connect the output of the FM signal generator to the test point TP5 and TP7.
(4) Set FM 90 MHz.
(5) Adjust L2 to have a max. Audio output.
(6) Set FM 106 MHz.
(7) Adjust TC2 to have a max. Audio output.
(8) Repeat steps 4-7 until best sensitivity on these two frequencies is formed.
c. Instrument Connection
L2
TC2
AM Signal Generator
SSVM
Test Point TP5
Test Point TP8
103pF
Test Point TP9
TP7
7
(4) ALIGNMENT FOR FM RANGE
a. Required Instruments
FM Signal Generator
SSVM
b. Alignment Procedure
Mode
Adjustment
L3
TC3
Procedure
(1) Set the power switch to ON.
(2) Connect a SSVM to the test point TP8 and TP9.
(3) Connect the output of the FM signal generator to the test point TP5 and TP7.
(4) Set FM 87 MHz.
(5) Adjust L3 to have a max. Audio output.
(6) Set FM 108.5 MHz.
(7) Adjust TC3 to have a max. Audio output.
(8) Repeat steps 4-7 until best sensitivity on these two frequencies is formed.
c. Instrument Connection
TC3
L3
AM Signal Generator
SSVM
Test Point TP5
Test Point TP8
103pF
Test Point TP9
TP7
8
(5) ALIGNMENT FOR AM SENSITIVITY
a. Required Instruments
AM Signal Generator
SSVM
b. Alignment Procedure
Mode
Adjustment
T2
TC4
Procedure
(1) Set the power switch to ON.
(2) Connect a SSVM to the test point TP8 and TP9.
(3) Connect the output of the FM signal generator to a standard loop antenna.
(4) Set AM 600 kHz.
(5) Adjust T2 to have a max. Audio output.
(6) Set AM 1400 kHz.
(7) Adjust TC4 to have a max. Audio output.
(8) Repeat steps 4-7 until best sensitivity on these two frequencies is formed.
c. Instrument Connection
T2
TC4
AM Signal Generator
SSVM
60 cm
Test Point TP8
The radio is located
Loop Antenna perpendicularly to
the Loop Antenna
Test Point TP9
9
(6) ALIGNMENT FOR AM RANGE
a. Required Instruments
AM Signal Generator
SSVM
b. Alignment Procedure
Mode
Adjustment
T5
TC1
Procedure
(1) Set the power switch to ON.
(2) Connect a SSVM to the test point TP8 and TP9.
(3) Connect the output of the FM signal generator to a standard loop antenna.
(4) Set AM 515 kHz.
(5) Adjust T5 to have a max. Audio output.
(6) Set AM 1750 kHz.
(7) Adjust TC1 to have a max. Audio output.
(8) Repeat steps 4-7 until best sensitivity on these two frequencies is formed.
c. Instrument Connection
T5
TC1
AM Signal Generator
SSVM
60 cm
Test Point TP8
The radio is located
Loop Antenna perpendicularly to
the Loop Antenna
Test Point TP9
10
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29
48
57
48
57
57
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45
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56
37
27
56
30
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34
EXPLODED VIEW
38
3
60
60
62
13
15
47
15
62
19
39
6
59
20
59
56
7
55
55
26
55
25
32
55
36
32
35
16
23
11
32
32
30
50
58
27
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16
16
56
27
59
56
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59
IC CIRCUIT BLOCK DIAGRAM
1. IC1 – LA1805
2. IC2 – TDA2822
23
3. IC3 – LA1186N
4. IC4 – NJM2100L
24
5. IC5 – TEA2025B
6. IC6 – LA5003
25
IC AND TRANSISTOR VOLTAGE CHART
IC1 – LA1805
IC2 – TDA2822
IC5 – TEA2025B
PIN
FM
AM
PIN
FM
AM
PIN
FM
AM
1
1.5
1.5
1
0
0
1
0
0
2
1.5
1.5
2
0
0
2
2.8
2.8
3
3
3
3
0
0
3
0
0
4
0.3
0.6
4
0
0
4
0
0
5
1.5
1.5
5
0
0
5
0
0
6
0
0
6
0
0
6
0.6
0.6
7
0.5
0.3
7
0
0
7
0
0
8
1
0.3
8
0
0
8
5.6
5.6
9
1.5
1.5
9
0
0
10
1.5
1.5
10
0
0
11
2.4
3
11
0.6
0.6
12
0.5
0.5
PIN
FM
AM
12
0
0
13
0
0
1
0.9
0
13
0
0
14
1.4
1.4
2
1.6
0
14
5.5
5.5
15
0.5
0.9
3
2.9
0
15
2.8
2.8
16
1.5
1.4
4
0
0
16
5.6
5.6
17
1.5
1.5
5
0
0
18
1.5
1.5
6
2.7
0
19
0.3
0.3
7
1.5
1.6
20
3
3
8
2.0
0
PIN
FM
AM
21
3
3
9
2.7
0
1
3
3
22
1.5
1.5
2
0
0
23
1.5
1.5
3
5
5
24
1.5
1.5
IC3 – LA1186N
IC4 – NJM2100L
PIN
FM
AM
1
1.5
1.5
2
1.5
1.5
3
1.6
1.6
4
0
0
5
1.6
1.6
6
1.6
1.6
7
1.5
1.5
8
3
3
26
IC6 – LA5003
Transistor
Q2
Q3
Q4
Q5
FM
AM
FM
AM
FM
AM
C
3
3
C
0
0
C
0
0
B
0.3
0.3
B
0.6
0.6
B
0
0
E
0
0
E
0
0
E
0
0
G
0
0
C
1.6
1.6
C
5.7
5.7
D
0
0
B
2.2
2.2
B
5
5
S
0
0
E
1.6
1.6
E
5.7
5.7
C
0
0.9
C
3
3
C
0
0.3
B
0.6
0
B
1.5
1.5
B
0.6
0
E
0
0
E
1.6
1.6
E
0
0
C
3
3
C
0
0
B
1.4
1.4
B
3
3
E
0.8
0.8
E
3
3
Q6
Q7
Q8
Q9
27
Q10
Q11
Q12
Semiconductor Lead Identification
Transistors
C
B
C
B
E
E
2SC4081
2SD1048
2SA1576
HM772
(E:Emitter C:Collector B:Base S:Source G:Gate D:Drain)
Diodes
Cathode Mark
A
C
A
C
A
C
A
C
1N4148
RLS4148
(A:Anode C:Cathode)
28