Sony XR-4740RDS User manual

FM/MW/LW CASSETTE CAR STEREO
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MG-25B-136
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XR-4740RDS/C430RDS/C440RDS
AEP Model
UK Model
SERVICE MANUAL
SPECIFICATIONS
Cassette player section
Tape track 4-track 2-channel stereo
Wow and flutter 0.08% (WRMS)
Frequency response 30 – 18,000 Hz
Signal-to-noise ratio
Tuner section
FM
Tuning range 87.5 – 108.0 MHz
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 8 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
70 dB (mono)
Harmonic distortion at 1 kHz
0.5% (stereo),
0.3% (mono)
Separation 35 dB at 1 kHz
Frequency response 30 – 15,000 Hz
Capture ratio 4 dB
MW/LW
Tuning range MW: 531 – 1,602 kHz
LW: 153 – 281 kHz
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity MW: 30 µV
LM: 50 µV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 35 W ×4 (at 4 ohms)
General
Outputs
(XR-C430RDS/C440RDS):
Power amplifier control lead
Rear line out (1)
Tone controls Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
Power requirements 12 V DC car battery (negative ground)
Dimensions Approx. 188 ×58 ×181 mm (w/h/d)
Mounting dimensions Approx. 182 ×53 ×164 mm (w/h/d)
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and connections (1 set)
Front panel case (1)
XR-C440RDS: Rotary commander RM-X2S
Design and specifications are subject to change without notice.
Photo: XR-C430RDS
For RM-X2S (Remote Commander),
please refer to RM-X2S/X3S Service
Manual (9-960-039-∏) previously issued.
(XR-C440RDS ONLY)
9-925-541-12 Sony Corporation
2001F0500-1 e Vehicle Company
C2001.6 ShinagawaTec Service Manual Production Group
Ver 1.1 2001.06

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TABLE OF CONTENTS
1. GENERAL
Location of Controls .......................................................... 3
Setting the Clock ............................................................... 3
Using the rotary remote ..................................................... 3
Adjusting the sound characteristics ................................... 4
Muting the sound ............................................................... 4
Changing the sound and beep tone .................................... 4
Installation ......................................................................... 5
Connections ....................................................................... 6
2. DISASSEMBLY............................................................ 9
3. ASSEMBLY OF MECHANISM DECK ............. 11
4. MECHANICAL ADJUSTMENTS ......................... 14
5. ELECTRICAL ADJUSTMENTS
Tape Deck Section ............................................................. 14
Tuner Section ..................................................................... 15
6. DIAGRAMS
6-1. Printed Wiring Boards – Main Section – ........................... 23
6-2. Schematic Diagram – Main Section – ............................... 25
6-3. Printed Wiring Board – Key Section – .............................. 30
6-4. Schematic Diagram – Key Section – ................................. 32
6-5. IC Pin Description ............................................................. 35
7. EXPLODED VIEWS ................................................... 37
8. ELECTRICAL PARTS LIST .................................... 40
SERVICING NOTES
Flexible Circuit Board Repairing
•Keep the temperature the soldering iron around 270° C during
repairing.
•Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
•Be careful not to apply force on the conductor when soldering or
unsoldering.
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

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SECTION 1
GENERAL This section is extracted
from instruction manual.

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Note: Follow the disassembly procedure in the numerical order given.
FRONT PANEL ASS’Y
SECTION 2
DISASSEMBLY
1 Push the button
(release).
A
2 Remove the front panel ass’y
to the direction of the arrow A .
COVER ASS’Y
2
1
3 cover ass’y
1
2

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SUB PANEL, MECHANISM DECK (MG-25B-136) 5
screw
(PTT2.6 × 6)
6 mechanism deck
(MG-25B-136)
4 flexible flat cable
(CN301)
1 three screws
(PTT2.6 × 8)
1 three screws
(PTT2.6 × 8)
MAIN BOARD, HEAT SINK
2 sub panel
3 connector
(CN302)
2 two ground point
screws
4 seven screws
(PTT2.6 × 8)
1 two screws
(PTT2.6 × 8)
3 main board
5 heat sink
1 screw
(PTT2.6 × 8)