Sangean DRC9 Service Manual
DCR-9/CRD-9
FM RDS/DAB DIGITAL CLOCK RADIO
CONTENTS
Specification ………………………………………………………………………………………………………2-3
Block Diagram …………………………………………………………………………………………..…………..4
All PCB Top View…………………………………………………………………….……….………….…..5
All PCB Bottom View……………..………………………………………………….……….………….…...6
LCD PCB Top View…………………………………………………………………………….……….……………7
LCD PCB Bottom View.………………………………………………………………………….……..………..…..8
Wiring Diagram..….………………………………………….………………….….……………..……….9
Troubleshooting Flow Chart..….………………………………………….……………….….……………..……10
Electrical Parts List………………………………………………………………………………....……………11-12
Mechanical Parts List……………………………………………………………………….………….………….13
Exploded Views.…………………………………………………………………………….…………….……………14
IC Circuit Block Diagram…………………………………………..…………….………………………………15-17
IC and Transistor Voltage Chart….……………………………..…………………………….…………………18-20
Semiconductor Lead Identifications……………………………………………………………………..……..…21
Shematic Diagram……………………………………….……………………………………………………22
SPECIFICATION
FM. ELECTRICAL PERFORMANCE
Model: DCR-9 Brand: Roberts
Temp: 25℃
R.H.: 75% Date: 2004/05/16
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 Frequency S/N=6dB 38.912 ±0.03
Maximum Sensitivity S/N=6dB
Usable Sensitivity S/N=30dB
90MHz
98MHz
106MHz
90MHz
98MHz
106MHz
3
3
3
9
9
9
9
9
9
15
15
15
MHz
DBu
EMF
DBu
EMF
Image Rejection S/N=6dB 106MHz 24 18 dB
I.F. Rejection S/N=6dB 90MHz 50 dB
3db Limiting 80dBu 12 18
Min. Output 1.5 3.0
Auto. Scan. Stop. Sens. 12 18
DBu
EMF
mV
rms
DBu
EMF
S/N (200mV) 75kHz/Dev. 56 46 dB
Stereo Separation 1KHz 26 20
Current Consumption 7.5V
30 50 mA
dB
60dBu R. O.
Current Consumption 6.7V
330 500 mA
98MHz
Am. Suppression (1mV)
32 26 dB
Spurious Rejection S/N=6dB 40 dB
Audio Fidelity
DBB Off 75kHz
(-3dB W/pre emphasis)
50 100 Hz
15K 12K Hz
Output Power
(75KHz Dev.)
10%T.H.D. 800 700 mW
TONE MAX,DBB ON
T. H. D. (75KHz dev.) 1 3 %
Over Load Capacity 10%T. H.D.
100 90 dBu
Supply Voltage：
DC：7.5V/6.7V
R.O.：50mW Load：8 Ohms
AC：230V / 50Hz
Remark:AC IN Accoding Area
( )The head of product
( )Finished Product
( )Semi-finished Product
( )New Model
( )Client Spot Check
( )Routine Spot Check
( )Engineering Modify
( )Business Sample
Approved by
Modulation：400Hz Modulation
22.5KHz Deviation
Released/Tested by
林弘堯
2004/05/16
2
SPECIFICATION
DAB(BAND
Model: DCR-9
Brand: Roberts
Ⅲ)
ELECTRICAL PERFORMANCE
Temp: 25℃
R.H.:75 % Date: 2004/05/16
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 32 35 dB
(Measurement to EN50248)
Fc : -70 dBm (W anted channel)
Fi : ≧ -25 dBm
Far-off Selectivity
FM 75Khz/dev. Fc ±5MHz
10A 45 55 dB
(Unwanted channel)
(Measurement to EN50248)
5A -94 -97 dBm
Sensitivity
Without pop noise
10A -95 -98 dBm
12B -95 -98 dBm
Test no.
Unit
1. 2.
13F -94 -97 dBm
S/N Ratio Without pop noise 10A 54 60 dB
Max. input Signal : Without pop noise 10A -10 0 dBm
5A -98 -102 dBm
Acquisition
Selectivity
(Measurement to EN50248)
10A -99 -102 dBm
12B -99 -102 dBm
13F -98 -102 dBm
Supply Voltage：
DC：7.5V/6.7V
R.O. : 50mW Load: 8 Ohm Modulation :1kHz
AC：230 V/ 50 Hz
Channel Freq.( MHz) Channel Freq.( MHz) Channel Freq.( MHz)
5A 174.928 10A 209.936 12B 225.648
13F 239.200
Remark:AC IN Accoding Area
( )The head of product
( )Finished Product
( )Semi-finished Product
( )New Model
( )Client Spot Check
( )Routine Spot Check
( )Engineering Modify
( )Business Sample
Approved by
林弘堯
2004/05/16
Released/Tested by
3
BLOCK DIAGRAM
SPEAKER
MONO
AUDIO POWER
AMPLIFIER
IC1
BACKLIGHT CONTROL
IC3,Q5-Q8,D1,SW4
LED500,LED501
EARPHONE JACK
AND SPEAKER MUTE
JK1,D1,Q1-Q3
EARPHONE
AMPLIFIER
IC4
TONE CONTROL
AMPLIFIER
IC2
7.5VDC
ACV IN
AC TO DC
RECTIFIER CIRCUIT
T301,D301-D304
C304, C308
6.7VDC
5V REGULATOR
IC301-IC302
RF MODULE
LCD DISPLAY
ROD
ANT.
4
MODEL1
STANDBY ENABLE
Q4,LED1
KEY FUNCTION
CONTROL
SW1-SW3
SW201-SW211
ALL PCB TOP VIEW
5
ALL PCB BOTTOM VIEW
6
LCD PCB TOP VIEW
7
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