DOWNLOAD Sony MEX-BT5700U / MEX-BT5750U Service Manual ↓ Size: 7.42 MB | Pages: 58 in PDF or view online for FREE

2009D05-1

© 

2009.04

Photo: MEX-BT5750U

Model Name Using Similar Mechanism

MEX-BT3700U/BT3750U

CD Mechanism Type

MG-101Z-188//Q

Optical Pick-up Name

DAX-25A

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

Tuning range: 87.5 – 107.9 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

Tuning range: 530 – 1,710 kHz
Antenna (aerial) terminal: External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26 μV

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

Bluetooth Standard version 2.0 + EDR

Output: Bluetooth Standard Power Class 2 (Max. +4 dBm)
Maximum communication range:

Line of sight approx. 10 m (33 ft)*

1

Frequency band: 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) 1.3
HFP (Handsfree Profile) 1.5
PBAP (Phone Book Access Profile)
OPP (Object Push Profile)

*1 The actual range will vary depending on factors such as

*2 Bluetooth standard profiles indicate the purpose of Bluetooth

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
BUS control input terminal
BUS audio input terminal
AUX input jack (stereo mini jack)
USB signal input terminal
MIC 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 accessories:

Card remote commander:

Parts for installation and connections (1 set)
Microphone: XA-MC10

CEA2006 Standard
Power Output: 17 Watts RMS 

s 4 at 

4 Ohms < 1% THD+N
SN Ratio: 82 dBA (reference: 1 Watt into 4 Ohms)

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

Tuning range: MW: 531 – 1,602 kHz

LW: 153 – 279 kHz

Antenna (aerial) terminal: External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: MW: 26 μV, LW: 45 μV

Tuning range: 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

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

 Electret condenser microphone (for specified unit only)

 Unidirectional

 25 g (0.88 oz) (microphone only)

 10.5 × 24 mm (

7

/

16

 × 

31

/

32

 in) (microphone only)

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

Tuning range: 531 – 1,602 kHz
Antenna (aerial) terminal: External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26 μV

RM-X305 (BT5700U: AEP and UK models)
RM-X306 (BT5700U: US and Canadian models)
RM-X307 (BT5750U)

•  MEX-BT5700U/BT5750U bundles XA-MC10 (microphone unit).

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.

• 

US and Canadian models:

 CAUTION
 

The use of optical instruments with this product will increase 
eye hazard.

• 

Except US and Canadian models:

 

This compact disc player is classifi ed as a CLASS 1 LASER 
product. The CLASS 1 LASER PRODUCT label is located on 
the exterior.

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

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

  ..................................................................   7

3-1.  Disassembly  Flow ..........................................................   13
3-2. Cover 

...............................................................................  13

3-3. Sub 

Panel 

Block 

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

3-4. CD 

Mechanism 

Block 

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

3-5. MAIN 

Board 

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

3-6. SERVO 

Board 

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

3-7. Chassis 

(T) 

Sub 

Assy 

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

3-8.  Roller Arm Assy ..............................................................   16
3-9. Chassis 

(OP) 

Assy 

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

3-10.  Chucking Arm Sub Assy .................................................   17
3-11. Sled Motor Assy 

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

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

TEST  MODE 

 ............................................................   20

5-1.  Block Diagram - AUDIO Section (1/2) - ........................   21
5-2.  Block Diagram - AUDIO Section (2/2) - ........................   22
5-3. Block 

Diagram 

 

- PANEL, POWER SUPPLY Section - ...........................   23

5-4.  Schematic Diagram - MAIN Section (1/5) - ...................   25
5-5.  Schematic Diagram - MAIN Section (2/5) - ...................   26
5-6.  Schematic Diagram - MAIN Section (3/5) - ...................   27
5-7.  Schematic Diagram - MAIN Section (4/5) - ...................   28
5-8.  Schematic Diagram - MAIN Section (5/5) - ...................   29
5-9.  Printed Wiring Boards - MAIN Section (1/2) - ..............   30
5-10.  Printed Wiring Boards - MAIN Section (2/2) - ..............   31
5-11.  Printed Wiring Boards - SUB Section - ..........................   32
5-12.  Schematic Diagram - SUB Section - ..............................   33
5-13.  Printed Wiring Boards - KEY Section - ..........................   34
5-14.  Schematic Diagram - KEY Section - ..............................   35

6-1. Main 

Section 

...................................................................  45

6-2.  Front Panel Section .........................................................   46
6-3.  CD Mechanism Deck Section (MG-101Z-188//Q) ........   47

  ..............................   48

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 “HD Radio Ready” logo indicates that this product will control a Sony HD Radio

TM

tuner (sold separately).
For HD Radio

TM

 tuner operation, please refer to the HD Radio

Instructions.

HD Radio

TM

 and the HD Radio Ready logo are proprietary trademarks of iBiquity Digital 

Corp.

The “SAT Radio Ready” logo indicates that this product will control a
satellite radio tuner module (sold separately). Please see your nearest
authorized Sony dealer for details on the satellite radio tuner module.

“SAT Radio,” “SAT Radio Ready,” the SAT Radio and SAT Radio Ready logos and all
related marks are trademarks of Sirius Satellite Radio Inc. and XM Satellite Radio Inc.

TM

tuner Operating 

COMPONENTS  IDENTIFIED  BY  MARK  0  OR  DOTTED  LINE  
WITH  MARK  0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.
REPLACE  THESE  COMPONENTS  WITH  SONY  PARTS 

LES  COMPOSANTS  IDENTIFIÉS  PAR  UNE  MARQUE  0  SUR  
LES  DIAGRAMMES  SCHÉMATIQUES  ET  LA  LISTE  DES  
PIÈCES  SONT  CRITIQUES  POUR  LA  SÉCURITÉ  DE  FONC-
TIONNEMENT.  NE  REMPLACER  CES  COMPOSANTS  QUE  
PAR  DES  PIÈCES  SONY  DONT  LES  NUMÉROS  SONT  DON-
NÉS  DANS  CE  MANUEL  OU  DANS  LES  SUPPLÉMENTS  
PUBLIÉS  PAR  SONY.

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.

IMPORTANT  NOTE  OF  “INITIALIZING”
When the BT board or MAIN board (including BT board) are re-
placed, it is necessary to initialize this set.
Refer to the following, initialize this set.
It is also possible to release the password lock by executing ini-
tialization.

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.

You can initialize the all Bluetooth-related settings from this unit.

#5 .

The Bluetooth settings menu appears.

Rotate the control dial to select “Initialize,” then press
the select button
The confirmation appears.

Select “Yes.”
“Initializing...” appears while initializing the Bluetooth settings.

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.

D

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

• 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 

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

Locks the personal information by setting a 4-digit password.
If you set the security, “Security Code” appears when the above
menus are operated.
To unlock the security, input the password. You can operate this unit
without input password until it is turned off.

ABOUT  THE  BT  BOARD  REPLACEMENT
When repairing, the complete BT board (Part No. A-1709-252-A) 
should be replaced since any parts in the BT board cannot be re-
paired.

ABOUT  THE  SERVO  BOARD  REPLACEMENT
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: Depending on the connecting device, Signal-strength/Battery-re-

maining indications might not be displayed.

 

  Or, depending on the connecting device, the levels of indications are 

shown incorrectly.

 

  Even if you see no indications or wrong indications, they are not 

failures of MEX-BT5700U/BT5750U.

1.  Search for the Bluetooth device (cellular phone) from this set, 

and confi rm whether the Bluetooth device is displayed.

 

Or, it searches for this set from the Bluetooth cellular phone, 
and whether this set (“XPLOD” or the name set by “Device 
Name”) is displayed is confi rmed.

2.  Search for the distance of this set and the Bluetooth device 

(cellular phone) about 5 m apart.

 Confi rm whether the Bluetooth device (or this set) is displayed 

after it searches.

3.  Do the pairing of the cellular phone and this set (input of pass 

code).

4.  Connect the cellular phone with this set, and confi rm the “HF” 

icon lights.

5. Confi rm the connection continues even if the distance of the 

cellular phone and this set is separated by about 5 m.

6.  Set this set besides the “Bluetooth Phone” source, and call the 

cellular phone connected with this set.

 Confi rm the automatic change of this set into “Bluetooth 

Phone” source, and the change into the screen for incoming 
calls.

 Confi rm the ring tone is heard from the speaker.
7.  Take a phone call (press the encoder switch), and start a con-

versation.

 Confi rm the other person voice is heard from the speaker.
 

Speak toward the microphone of this set, and confi rm whether 
the other party hears its voice (At the external microphone 
noncontact).

 

Compare the sound quality with a normal set. Confi rm  that 
there is no big difference.

8.  Speak toward an external microphone at the following condi-

tion, and confi rm the other party hears its voice.

•  An external microphone is connected.
•  The “Mic Select” of the Bluetooth menu is set to “External”.
9.  Turn on ACC from off, and confi rm whether this set connects 

Bluetooth with the cellular phone again.

Note: Depending on the celluar phone, it might not reconnect automati-

cally when ACC is turned on.

Note: Depending on the connecting BT Audio device, track information 

(e.g. track name, playback time) can be on display.

 

If the device doesn’t support AVRCP1.3, or, if AVRCP1.3 feature of 
the device has not been validated with MEX-BT5700U/BT5750U;   

 

the track information won't be shown.

 

Even if there is no track information on display during playback 
of an AVRCP1.3 device, it is not a failure of MEX-BT5700U/
BT5750U.

1.  Connect the Bluetooth audio device (or cellular phone with 

Bluetooth audio function) with this set, and confi rm the “Au-
dio Streaming” icon lights.

2.  Playback Bluetooth audio. Confi rm the sound is emitted from 

this set when this set is switched to “Bluetooth Audio” source.

3. Confi rm whether Bluetooth audio can be controlled by operat-

ing this set (the [SEEK +], [SEEK 

−], [PAUSE] keys opera-

tion).

Note: Varies depending on the connected Bluetooth audio device.

BLUETOOTH  FUNCTION  CHECKING  METHOD  USING  
A  CELLULAR  PHONE
1. Required Equipment
•  Set to be tested (MEX-BT5700U/BT5750U), external micro-

phone of attachment (XA-MC10) if necessary

•  Cellular phone (Recommended SEMC W880 or W910i, or se-

lect from connectable cellular phones list)

•  Bluetooth audio devices (SONY NWZ-A826, or select from 

connectable cellular phones/audio devices list)

•  Speaker connection (at least Front L/R ch)
•  DC power supply (12 V)

2. Preparation
• Confi rm the setting of the MEX-BT5700U/BT5750U, and no-

tate it.

•  Execute the following setting from the Bluetooth menu of the 

MEX-BT5700U/BT5750U.

 Signal : 

on

 Visibility 

: 

Show

•  Turn on the Bluetooth function of the cellular phone.

3. Test Environment
•  No other Bluetooth device is making a communication in the 

periphery (within 20 m).

•  No other MEX-BT5700U/BT5750U are supplied with electric 

power.

•  There are no two or more wireless LAN access points in the 

periphery (with 50 m) (one is OK).

•  The set should be tested in a place such as a meeting room, free 

from ambient noise.

•  The speaker at the far end should be in a place such as another 

meeting room separated acoustically.

4. Setting
Install the MEX-BT5700U/BT5750U on the desktop.

5. Precautions
Beware of the following points when conducting the 
talking test:
•  There is no fault if a talking can be made by adjusting appro-

priately the volume of the telephone of the other party and the 
cellular phone connected through the Bluetooth, besides the 
setup of MEX-BT5700U/BT5750U.

•  The speaker’s voice will become loud naturally if the periph-

ery is noisy, or become low if quiet (even though the speaker 
intents to talk on the same volume level).

•  The speaker’s voice will become loud naturally if the other 

party’s voice is loud.