DOWNLOAD Sony MEX-BT4700U / MEX-BT4750U Service Manual ↓ Size: 4.91 MB | Pages: 52 in PDF or view online for FREE

2009C05-1

© 

2009.03

Photo: MEX-BT4700U

Signal-to-noise ratio: 120 dB
Frequency response: 10 – 20,000 Hz
Wow and flutter: Below measurable limit

FM
Tuning range: 87.5 – 108.0 MHz
Antenna (aerial) terminal:

External antenna (aerial) connector

Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response: 20 – 15,000 Hz
MW/LW
Tuning range:

MW: 531 – 1,602 kHz
LW: 153 – 279 kHz

External antenna (aerial) connector

Intermediate frequency: 25 kHz
Sensitivity: MW: 26 μV, LW: 45 μV

Interface: USB (Full-speed)
Maximum current: 500mA

Bluetooth Standard version 2.0

Bluetooth Standard Power Class 2 (Max. +4 dBm)

Line of sight approx. 10 m (33 ft)*

1

2.4 GHz band (2.4000 – 2.4835 GHz)

Modulation method: FHSS
Compatible Bluetooth Profiles*

2

A2DP (Advanced Audio Distribution Profile)
AVRCP (Audio Video Remote Control Profile)
HFP (Handsfree Profile) 1.5
HSP (Headset Profile)

*1 The actual range will vary depending on factors

*2 Bluetooth standard profiles indicate the purpose of

Output: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W

s 4 (at 4 ohms)

Audio outputs terminal (front/rear)
Subwoofer output terminal (mono)
Power antenna (aerial) relay control terminal
Power amplifier control terminal

Remote controller input terminal
Antenna (aerial) input terminal
Telephone ATT control terminal
Illumination control terminal
AUX input jack (stereo mini jack)
USB signal input terminal

Low: ±10 dB at 60 Hz (XPLOD)
Mid: ±10 dB at 1 kHz (XPLOD)
High: ±10 dB at 10 kHz (XPLOD)

Power requirements: 12 V DC car battery

(negative ground (earth))

Dimensions: Approx. 178

s 50 s 182 mm

(7

1

/

8

s 2 s 7

1

/

4

in) (w/h/d)

Mounting dimensions: Approx. 182

s 53 s 162 mm

(7

1

/

4

s 2

1

/

8

s 6

1

/

2

in) (w/h/d)

Mass: Approx. 1.3 kg (2 lb 14 oz)
Supplied accessory:

Card remote commander: RM-X304
Parts for installation and connections (1 set)

87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)

FM tuning interval: 50 kHz/200 kHz switchable
Antenna (aerial) terminal:

External antenna (aerial) connector

Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response: 20 – 15,000 Hz
AM
Tuning range:

531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)

AM tuning interval: 9 kHz/10 kHz switchable
Antenna (aerial) terminal:

External antenna (aerial) connector

Intermediate frequency: 25 kHz
Sensitivity: 26 μV

87.5 – 108.0 MHz (at 50 kHz step)

External antenna (aerial) connector

Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response: 20 – 15,000 Hz
AM
Tuning range:

531 – 1,602 kHz (at 9 kHz step)

External antenna (aerial) connector

Intermediate frequency: 25 kHz
Sensitivity: 26 μV

Model Name Using Similar Mechanism

CDX-GT630UI/GT637UI/GT680UI/GT686UI

CD Mechanism Type

MG-101Z-188//Q

Optical Pick-up Name

DAX-25A

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.

FLEXIBLE  CIRCUIT  BOARD  REPAIRING
• 

Keep the temperature of 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.

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion exposure.

This label is located on the bottom of the
chassis.

  .............................................   3

  ..................................................................   6

3-1.  Disassembly  Flow ..........................................................   14
3-2. Cover 

...............................................................................  14

3-3. Sub 

Panel 

Assy 

................................................................  15

3-4. CD 

Mechanism 

Block 

.....................................................  15

3-5. MAIN 

Board 

...................................................................  16

3-6. SERVO 

Board 

.................................................................  16

3-7. Chassis 

(T) 

Sub 

Assy 

......................................................  17

3-8.  Roller Arm Assy ..............................................................   17
3-9. Chassis 

(Op) 

Assy 

...........................................................  18

3-10.  Chucking Arm Sub Assy .................................................   18
3-11. Sled Motor Assy 

..............................................................   19

3-12.  Optical Pick-up Block .....................................................   19
3-13. Optical Pick-up ...............................................................   19

4-1.  Block Diagram - AUDIO Section (1/2) - ........................   20
4-2.  Block Diagram - AUDIO Section (2/2) - ........................   21
4-3. Block 

Diagram 

- PANEL, POWER SUPPLY Section - ...........................   22

4-4.  Printed Wiring Boards - MAIN Section (1/2) - ..............   24
4-5.  Printed Wiring Boards - MAIN Section (2/2) - ..............   25
4-6.  Schematic Diagram - MAIN Section (1/4) - ...................   26
4-7.  Schematic Diagram - MAIN Section (2/4) - ...................   27
4-8.  Schematic Diagram - MAIN Section (3/4) - ...................   28
4-9.  Schematic Diagram - MAIN Section (4/4) - ...................   29
4-10.  Printed Wiring Boards - SUB Section - ..........................   30
4-11.  Schematic Diagram - SUB Section - ..............................   31
4-12.  Printed Wiring Boards - KEY Section - ..........................   32
4-13.  Schematic Diagram - KEY Section - ..............................   33

5-1. Main 

Section 

...................................................................  39

5-2.  Front Panel Section .........................................................   40
5-3.  CD Mechanism Deck Section (MG-101Z-188//Q) ........   41

  ..............................   42

Accessories are given in the last of the electrical parts list.

The Bluetooth word mark and logos are owned 
by the Bluetooth SIG, Inc. and any use of such 
marks by Sony Corporation is under license. 
Other trademarks and trade names are those of 
their respective owners.

ZAPPIN is a trademark of Sony Corporation.

iPod is a trademark of Apple Inc., registered in 
the U.S. and other countries.

iPhone is a trademark of Apple Inc.

Windows Media, and the 
Windows logo are trademarks 
or registered trademarks of 
Microsoft Corporation in the 

United States and/or other countries.

MPEG Layer-3 audio coding technology and 
patents licensed from Fraunhofer IIS and Thomson.

This product is protected by certain intellectual 
property rights of Microsoft Corporation. Use or 
distribution of such technology outside of this 
product is prohibited without a license from 
Microsoft or an authorized Microsoft subsidiary.

Content providers are using the digital rights 
management technology for Windows Media 
contained in this device (“WM-DRM”) to protect 
the integrity of their content (“Secure Content”) so 
that their intellectual property, including copyright, 
in such content is not misappropriated.
This device uses WM-DRM software to play 
Secure Content (“WM-DRM Software”). If the 
security of the WM-DRM Software in this device 
has been compromised, owners of Secure Content 
(“Secure Content Owners”) may request that 
Microsoft revoke the WM-DRM Software’s right 
to acquire new licenses to copy, display and/or 
play Secure Content. Revocation does not alter the 
WM-DRM Software’s ability to play unprotected 
content. A list of revoked WM-DRM Software is 
sent to your device whenever you download a 
license for Secure Content from the Internet or 
from a PC. Microsoft may, in conjunction with 
such license, also download revocation lists onto 
your device on behalf of Secure Content Owners.

The laser diode in the optical pick-up block may suffer electrostat-
ic break-down because of the potential difference generated by the 
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also 
use the procedure in the printed matter which is included in the 
repair parts.
The fl exible board is easily damaged and should be handled with 
care.

NOTES  ON  LASER  DIODE  EMISSION  CHECK
Never look into the laser diode emission from right above when 
checking it for adjustment. It is feared that you will lose your 
sight.

If the optical pick-up block is defective, please replace the whole 
optical pick-up block.
Never turn the semi-fi xed resistor located at the side of optical 
pick-up block.

UNLEADED  SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution:  Some printed circuit boards may not come printed with 

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.
•  Unleaded solder melts at a temperature about 40 °C higher 

than ordinary solder.

 

Ordinary soldering irons can be used but the iron tip has to be 
applied to the solder joint for a slightly longer time.

 

Soldering irons using a temperature regulator should be set to 
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if 

the heated tip is applied for too long, so be careful!

• Strong 

viscosity

 

Unleaded solder is more viscous (sticky, less prone to fl ow) 
than ordinary solder so use caution not to let solder bridges 
occur such as on IC pins, etc.

•  Usable with ordinary solder
 

It is best to use only unleaded solder but unleaded solder may 
also be added to ordinary solder.

TEST  DISCS
Use following TEST DISC when this set confi rms the operation 
and checks it.

Part No.   

Description

3-702-101-01 

YEDS-18 (for CD)

4-225-203-01 

PATD-012 (for CD)

NOTE  FOR  THE  20-PIN  CONNECTOR (CN901)
Do not use alcohol to clean the 20-pin connector (CN901) connect-
ing the front panel with the main body.
Do not touch the connector directly with your bare hand. Poor con-
tact may be caused.

EXTENSION  CABLE  AND  SERVICE  POSITION
When repairing or servicing this set, connect the jig (extension cable) as shown below.

•  Connect the MAIN board (CN350) and the SERVO board (CN401) with the extension cable (Part No. J-2502-076-1).

NOTE  FOR  REPLACEMENT  OF  THE  BT  BOARD
When repairing, the complete BT board (Part No. A-1641-142-A) 
should be replaced since any parts in the BT board cannot be re-
paired.

NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board (Part No. A-1554-
409-A) should be replaced since any parts in the SERVO board 
cannot be repaired.

NOTE  FOR  REPLACEMENT  OF  THE  USB  CONNECTOR 
(CN971)
To replace the USB connector requires alignment.
1.  Insert the USB connector into the front panel.
2.  Place the KEY board on the front panel and align the terminals 

of the USB connector with the holes in the KEY board.

3.  Solder the six terminals of the connector.

Under normal conditions, the battery will last approximately 1 year.
(The service life may be shorter, depending on the conditions of use.)
When the battery becomes weak, the range of the card remote commander
becomes shorter. Replace the battery with a new CR2025 lithium battery.
Use of any other battery may present a risk of fire or explosion.

Notes on the lithium battery
• Keep the lithium battery out of the reach of children.

• Wipe the battery with a dry cloth to assure a good contact.
• Be sure to observe the correct polarity when installing the battery.
• Do not hold the battery with metallic tweezers, otherwise a short-circuit

D

Battery may explode if mistreated.
Do not recharge, disassemble, or dispose of in fire.

4-130-436-0

[]

BT4700U: AEP and UK models

4-130-437-0

[]

BT4700U: Russian model

4-130-438-0

[]

BT4750U: E model

4-130-439-0

[]

BT4750U: Indian model

4-130-440-0

[]

BT4750U: Mexican model

4-130-441-0

[]

BT4750U: Saudi Arabia model