Sangean DPR25 Service Manual
DPR-25
DAB+FM RDS+MW DIGTAL RECEVIER
CONTENTS
Specification ………………………………………………………………………………………………………2-5
Block Diagram ………………………………………………………………………………………………………6
Alignment Instructions…………………………………………………………………………….………………7-11
Test Points Disgram…………………………………………………………………………….……….……………12
Main PCB Top View…………………………………………………………………………….……….……………13
Main PCB Bottom View.………………………………………………………………………….……..………..…..14
LCD PCB Top View……………………………………………………………………………….………….……15
LCD PCB Bottom View……………………………………………………………………………………………16
PCB Top View…………………………………………………………………………….……….……………17
PCB Bottom View…………………………………………………………………………….……….……………18
Wiring Diagram..….………………………………………….………………….….……………..……….19
Troubleshooting Flow Chart..….………………………………………….……………….….……………..……20-21
Electrical Parts List………………………………………………………………………………....……………22-25
Mechanical Parts List……………………………………………………………………….……….…………….26-27
Exploded Views.…………………………………………………………………………….…………….……………28
IC Circuit Block Diagram…………………………………………..…………….………………………………29-38
IC and Transistor Voltage Chart….……………………………..…………………………….…………………39-43
Semiconductor Lead Identifications……………………………………………………………………..……..…44
MAIN Schematic Diagram……………………………………………………………………………………………45
LCD Schematic Diagram………………………………………………………………..……………………..… …46
SPECIFICATION
FM. ELECTRICAL PERFORMANCE
Model: DPR-25 Brand:SANGEN
Temp: °C
R.H.: % Date: 2005/9/2
Condition Value Test no.
Test Item
Unit
Input Output freq Nom. Lim 1. 2.
Tuning Range S/N=6dB
Min 87.5
MHz
Max 108
Intermediate freq. S/N=6dB 10.7
Max. Sensitivity S/N=6dB
Usable Sensitivity S/N=30dB
90MHz
98MHz
106MHz
90MHz
98MHz
106MHz
12
12
12
18
18
18
±0.05
18
18
18
24
24
24
MHz
dBu
dBu
Image Rejection S/N=6dB 106MHz 24 18 dB
Stereo Ind Sens. S/N=6dB 106MHz 22 26 dB
I.F. Rejection S/N=6dB 90MHz 60 dB
3db Limiting 80dBu 18 24 dBu
Min. output 1.5 3 mV
Auto Scan 22 28 dBu
S/N (1mV) 46 40 dB
Current Consumption R. O. 160 180 mA
Am. Suppression (1mV) 32 26 dB
Stereo Separation(lkHz) 26 20 dB
Audio fidelity
75kHz/or 50kHz
(-3dB W/pre emphasis)
60dBu
98MHz
100 200 Hz
10K 8K Hz
Output Power(75KHz dev.) 10%T.H.D. 1000 700 mW
T. H. D. (75KHz dev.) 1 3 %
Over load capacity 10%T. H.D.
100 90 dBu
90MHz
Calibration S/N=6dBu
98MHz
KHz
106MHz
Lowest Batt. Volt. 60dBu 98MHz 6.3 6.7 V
Supply Voltage: DC 9V
Remark:
R.O.: 50mW
Load: 8 Ohm
Modulation: 1KHz Mod./22.5KHz Dev.
Approved by Released/Tested by
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2
SPECIFICATION.
Model: DPR-25
MW. ELECTRICAL PERFORMANCE
Brand: SANGEAN
Temp: °C
R.H.: % Date: 2005/9/2
Condition Value Test no.
Test Item
Unit
Input Output freq Nom. Lim 1. 2.
Tuning Range
Min 522
KHz
Max 1710
Intermediate freq. S/N=6dB Min 450
Max. Sensitivity S/N=6dB
Usable Sensitivity S/N=20dB
603KHz
999KHz
1404KHz
603KHz
999KHz
1404KHz
46
42
42
56
54
54
±2
56
54
54
62
60
60
KHz
dBu/m
dBu/m
Image Rejection S/N=6dB 1404KHz 36 30 dB
I.F. Rejection S/N=6dB 603KHz 50 40 dB
Selectivity(±10KHz)
S/N=6dB 32 26 dB
Bandwidth(-6dB) S/N=6dB 6-11 KHz
T. H. D. 74dBu/m 2 4 %
Lowest Batt. Volt. 74dBu/m 6.3 6.7 V
Hum Modulation
Auto. Scan. Stop. Sens. 56 62
100dBu/m
dB
dBu/m
Current Consumption 74dBu/m 160 180 mA
999KHz
Tone Action (3KHz) 74dBu/m dB
Freq. Response
(-6dB)
74dBu/m
100 200 Hz
2500 1800 Hz
Output Power 80% Mod. 10%T.H.D. 1000 700 mW
Over load capacity 80%mod. 10%T. H.D. 100 90
A. G. C. F. O. M.
100dBu/m
46 40 dB
dBu/m
S/N Ration 74dBu/m 40 34 dB
Whistle Modulation 74dBu/m 2IF/3IF 15 %
Supply Voltage: DC 9 V R.O.: 50mW Load: 8 Ohm
Remark:
Modulation: 1KHz/30% Mod
Approved by Released/Tested by
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3
SPECIFICATION.
DAB(BAND
Model: DPR-25 Brand: SANGEAN
Ⅲ)
ELECTRICAL PERFORMANCE
Temp: °C
R.H.: % Date: 2005/9/2
Test Item Condition CH Limit Typical
Min 5A CH
RF Freq. Range
Max 13F CH
Fc : -70 dBm (W anted channel)
Adjacent Channel
Selectivity
Fi : ≧ -38 dBm
(Unwanted channel)
10A 30 33 dB
(Measurement to EN50248)
Fc : -70 dBm (W anted channel)
Fi : ≧ -25 dBm
Far-off Selectivity
FM 75Khz/dev. Fc ±5MHz
10A 43 53 dB
(Unwanted channel)
(Measurement to EN50248)
5A -87 -90 dBm
Sensitivity
Without pop noise
10A -88 -91 dBm
12B -88 -91 dBm
13F -87 -90 dBm
Test no.
Unit
1. 2.
S/N Ratio Without pop noise 10A 50 56 dB
Max. input Signal : Without pop noise 10A -10 0 dBm
5A -90 -92 dBm
Acquisition
Selectivity
(Measurement to EN50248)
10A -92 -94 dBm
12B -92 -94 dBm
13F -90 -92 dBm
Output Power
1kHz
10%T.H.D. 1000 700 mW
T. H. D. 1 3 %
Low battery
Indication on
FREQ
RESPONSE
10A 6.7 6.7 V
AT CHANNEL 10A CHANGE
SERVICE AF
125H
Z
8KHZ +4 +7 dB
+4 +7 dB
Supply Voltage：
DC：9V
Channel
Freq.( MHz)
R.O. : 50mW Load: 8 Ohm Modulation :1kHz
Channel Freq.( MHz) Channel Freq.( MHz)
5A 174.928 10A 209.936 12B 225.648
13F 239.200
( )The head of product
( )Finished Product
( )Semi-finished Product
( )New Model
( )Client Spot Check
( )Routine Spot Check
( )Engineering Modify
( )Business Sample
Approved by Released/Tested by
4
Model: DPR-25
SPECIFICTION.
AUX-IN ELECTRICAL PERFORMANCE
Brand: ALL
Temp: 25 ℃
R. H. : 75 % Date: 2005/9/2
Test Item
Output Power
AUX IN
Dynamic Range
I/S (Input Sensitivity)
DISTORTION
MIN OUTPUT
S/N RATIO
Frequency Response
Condition
Value Test No.
Input Output Freq. Nom. Lim. 1. 2.
AUX IN=0.5V/1KHz
THD=10%
1 0.7
Output=R.0 (ATT=0)
THD=3%
1 05
AUX IN=100Hz
AUX IX=100Hz，ATT=0
OUT= 0.5W
130 ±30
Volume=MAX
AUX IN =I/S 1KHz
OUT=R.O
AUX IN =I/S 1KHz
Volume=MIN
AUX IN =I/S 1KHz&GND
OUT=R.O
AUX
IN=0.5V/1KHz
OUT=50mW=0dB
100
10K 8 4
0.1 0.4
0.7 2
65 55
10 6
Unit
W
V
mV
%
mV
dB
dB
AUX IN =I/S 1KHz 130 ±30
LINE OUT LEVEL
(REC OUT IMPD=47K)
FM DEV=22.5K@1KHz 150/ ±30
Supply Voltage: DC 9 V R.O.: 50mW Load: 8 Ohm
Remark:
Approved by Released/Tested by
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( )半成品( )新機種 ( )工程變更:
mV
Modulation:
1KHz/30% Mod
5
Q15
Q17
AUX
BLOCK DIAGRAM
SW
TC4066
LINE
OUT
3D
PT2386
DC / DC
15V
DAB
Pre-AMP
Tuner
Q4
Q23
PLL & LPF
TA2149
TC9257
RDS
BU1924
Q5
Q6
3DSW
Main-AMP
AN7142
DC / DC
3.3V
DC / DC
5V
6V
REG
FLIP-FLIP
TC4013
POWKEY
u-COM
TMP87EP26F
KEY
Q10
Q27
5V
REG.
9V
REG.
Q22
Q19
DC JACK
9-14V
6
ALIGNMENT INSTRUCTIONS
1. ALIGNMENT FOR AM/LW IF
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 TP1 and TP2.
AM T1
c. Instrument Connection
(3) Connect the RF output terminal of AM IF sweep generator to another test point TP5.
(4) Connect a 100μF electrolytic capacitor to test point TP2 and TP4.
(5) Adjust T1 to have a max. output with a marker frequency of 450 kHz on the sweep
scope.
T1
TP4 TP2
100uF
450KHz Marker
TP1
IN
TP2
1.2KΩ
RF
OUT
2.2KΩ
AM IF Sweep Generator
TP5
7
2. ALIGNMENT FOR AM/LW TUNING VOLTAGE RANGE
a. Required Instruments:
DVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Turn on the radio.
L3
AM
c. Instrument Connection
TC1
(2) Connect the probe of DVM to the test point TP1 and TP2.
(3) Tune the AM frequency to 522 kHz.
(4) Adjust L3 to have a reading of 1.2 ±0.04V.
(5) Tune the AM frequency to 1629 kHz.
(6) Adjust TC1 to have a reading of 7.6 ±0.3V.
TC1
L3
DVM
TP1
TP2
8
3. ALIGNMENT FOR FM TUNING VOLTAGE
a. Required Instruments
DVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Turn on the radio.
FM L4
c. Instrument Connection
(2) Connect the probe of DVM to the TP1 and TP2
(3) Tune the FM frequency to 108MHz.
(4) Adjust L4 to have a reading of 8.2V ±0.3V.
L4
TP1
TP2
DVM
9
4. ALIGNMENT FOR AM/LW 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 TP7 and TP8 terminals.
(3) Connect an AM signal generator together with standard loop dummy antenna and
feed 30% modulated signal to the AM ferrite bar antenna L12.
TC3
AM
L12
c. Instrument Connection
(4) Tune the generator frequency to 1404 kHz.
(5) Tune the AM frequency to 1404 kHz and adjust TC3 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 L12 to have a max reading on
SSVM.
(8) Repeat (4) to (7) as necessary to minimize tracking error.
AM Signal Generator
Loop Antenna
60 cm
The radio is located
perpendicularly to
the Loop Antenna
TC3
L12
DVM
TP7
TP8
10
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 TP7 and TP8.
(3) Connect a FM signal generator to TP10 and TP11.
TC2
FM
c. Instrument Connection
L8
(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 TC2 to have a max audio output.
(7) Tune the FM frequency to 90MHz and adjust L8 to have a max audio output.
(8) Repeat (6) to (7) as necessary to minimize tracking error.
TC2
L8
DVM
TP11
SSG
TP10
11
TP7
TP8
TEST POINTS DIAGRAM
12
MAIN PCB TOP VIEW
13
MAIN PCB BOTTOM VIEW
14
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