DOWNLOAD Sony MEX-BT2900 / MEX-BT2950 Service Manual ↓ Size: 2.8 MB | Pages: 42 in PDF or view online for FREE

Model
MEX-BT2900 MEX-BT2950
Pages
42
Size
2.8 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
mex-bt2900-mex-bt2950.pdf
Date

Sony MEX-BT2900 / MEX-BT2950 Service Manual ▷ View online

SERVICE MANUAL
Sony Corporation
Published by Sony Techno Create Corporation
MEX-BT2900/BT2950
SPECIFICATIONS
 AUDIO SYSTEM
9-893-038-02
2011D05-1
© 
2011.04
US Model
Canadian Model
AEP Model
UK Model
MEX-BT2900
E Model
MEX-BT2950
Ver. 1.1  2011.04
Model Name Using Similar Mechanism
CDX-GT250MP/GT300MP
Mechanism Type
MG-101X-188//Q
Optical Pick-up Name
DAX-25A
Photo: MEX-BT2900
Tuner section (BT2900: US and Canadian models)
FM
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
AM
Tuning range: 530 – 1,710 kHz
Antenna (aerial) terminal: 
External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26 μV
CD Player section
Signal-to-noise ratio: 120 dB
Frequency response: 10 – 20,000 Hz
Wow and flutter: Below measurable limit
Wireless Communication
Communication System: 
Bluetooth Standard version 2.1 + 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) 1.2
AVRCP (Audio Video Remote Control Profile) 1.3
HFP (Handsfree Profile) 1.5
PBAP (Phone Book Access Profile)
OPP (Object Push Profile)
FOR UNITED STATES CUSTOMERS. NOT 
APPLICABLE IN CANADA, INCLUDING 
IN THE PROVINCE OF QUEBEC.
POUR LES CONSOMMATEURS AUX 
ÉTATS-UNIS. NON APPLICABLE AU 
CANADA, Y COMPRIS LA PROVINCE DE 
QUÉBEC.
CEA2006 Standard
Power Output: 17 Watts RMS 
4 Ohms < 1% THD+N 
SN Ratio: 80 dBA 
(reference: 1 Watt into 4 Ohms)
AUDIO POWER SPECIFICATIONS
(BT2900: US and Canadian models only)
4 at 
*1 The actual range will vary depending on factors 
such as obstacles between devices, magnetic 
fields around a microwave oven, static electricity, 
reception sensitivity, antenna’s performance, 
operating system, software application, etc.
*2 Bluetooth standard profiles indicate the purpose of 
Bluetooth communication between devices.
Power amplifier section
Output: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W 
× 4 (at 4 ohms)
General
Outputs: 
Audio outputs terminal (front, rear/sub switchable)
(BT2900: US and Canadian models/BT2950)
Audio outputs terminal (rear/sub switchable)
(BT2900: AEP and UK models)
Power antenna (aerial) relay control terminal
Power amplifier control terminal
Inputs: 
BUS control input terminal
BUS audio input terminal
(BT2900: US and Canadian models)
(BT2900: US and Canadian models)
Telephone ATT control terminal
Remote controller input terminal
Antenna (aerial) input terminal
AUX input jack (stereo mini jack)
Tone controls: 
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 
× 50 × 179 mm 
(7
1
/
8
 
× 2 × 7
1
/
8
 in) (w/h/d)
Mounting dimensions: Approx. 182 
× 53 × 162 mm 
(7
1
/
4
 
× 2
1
/
8
 
× 6
1
/
2
 in) (w/h/d)
Mass: Approx. 1.2 kg (2 lb 11 oz)
Supplied accessories: 
Card remote commander: RM-X304 
(BT2900: US and Canadian models/BT2950)
Parts for installation and connections (1 set)
Design and specifications are subject to change 
without notice.
Tuner section (BT2900: AEP and UK models)
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
Antenna (aerial) terminal: 
External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: MW: 26 μV, LW: 45 μV
Tuner section (BT2950)
FM
Tuning range:
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 108.0 MHz (at 100 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
FM tuning step: 50 kHz/100 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
MW
Tuning range: 
531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)
MW tuning step: 9 kHz/10 kHz switchable
Antenna (aerial) terminal:
 
External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26 μV
SW
Tuning range: 
SW1: 2,940 – 7,735 kHz
SW2: 9,500 – 18,135 kHz
(except for 10,140 – 11,575 kHz)
Antenna (aerial) terminal: 
External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 30 μV
MEX-BT2900/BT2950
2
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.
SAFETY-RELATED  COMPONENT  WARNING!
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 
 
WHOSE  PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS  
MANUAL  OR  IN  SUPPLEMENTS  PUBLISHED  BY  SONY.
ATTENTION  AU  COMPOSANT  AYANT  RAPPORT  
À  LA  SÉCURITÉ!
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.
CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion exposure.
• US and Canadian models:
CAUTION
The use of optical instruments with this 
product will increase eye hazard.
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.
HD Radio
TM
 is a proprietary trademark 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 XM 
Radio Inc. and XM Satellite Radio Inc.
Windows Media is either a registered trademark 
or trademark of Microsoft Corporation in the 
United States and/or other countries.
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.
MPEG Layer-3 audio coding technology and 
patents licensed from Fraunhofer IIS and Thomson.
x Except US and Canadian models:
This label is located on the bottom of the
chassis.
MEX-BT2900/BT2950
3
1. 
SERVICING  NOTES
  .............................................   3
2. GENERAL
   ..................................................................  
7
3. DISASSEMBLY
3-1.  Disassembly  Flow ...........................................................   13
3-2.   Cover ...............................................................................   13
3-3.  CD Mechanism Deck (MG-101X-188//Q) .....................   14
3-4. 
ANTENNA  Board ...........................................................   14
3-5.  MAIN Board (with BT 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 Section ..................................................   19
3-13.  Optical Pick-up ...............................................................   19
4. 
TEST  MODE 
 ............................................................   20
5. DIAGRAMS
5-1.  Printed Wiring Boards - MAIN Section - .......................   22
5-2.  Schematic Diagram - MAIN Section (1/3) - ...................   23
5-3.  Schematic Diagram - MAIN Section (2/3) - ...................   24
5-4.  Schematic Diagram - MAIN Section (3/3) - ...................   25
5-5.  Printed Wiring Board - KEY Board -..............................   26
5-6.  Schematic Diagram - KEY Board - ................................   27
6. 
EXPLODED  VIEWS
6-1.  Main  Section ...................................................................   32
6-2.  Front Panel Section .........................................................   33
6-3.  CD Mechanism Section (MG-101X-188//Q) .................   34
7. 
ELECTRICAL  PARTS  LIST
   ..............................   35
Accessories are given in the last of the electrical parts list.
TABLE  OF  CONTENTS
SECTION  1
SERVICING  NOTES
NOTES  ON  HANDLING  THE OPTICAL  PICK-UP  
BLOCK  OR  BASE  UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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.
optical pick-up
semi-fixed resistor
MEX-BT2900/BT2950
4
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)
 : LEAD  FREE  MARK
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  15-PIN  CONNECTOR (CN901)
Do not use alcohol to clean the 15-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 (CN701) and the SERVO board 
(CN401) with the extension cable (Part No. J-2502-076-1).
SERVO boadd
(CN401)
MAIN board
(CN701)
extension cable
(Part No. J-2502-076-1)
NOTE  FOR  REPLACEMENT  OF  THE  BT  BOARD
When repairing, the complete BT board should be replaced since 
any parts in the BT board cannot be repaired.
NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board should be replaced 
since any parts in the SERVO board cannot be repaired.
NOTE  FOR  REPLACEMENT  OF  THE  SWITCH  BOARD
When SWITCH board is defective, exchange the MECHANICAL 
BLOCK ASSY (X).
Page of 42
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Sony MEX-BT2900 / MEX-BT2950 Service Manual ▷ Download

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  • Here you can View online or download the Service Manual for the Sony MEX-BT2900 / MEX-BT2950 in PDF for free, which will help you to disassemble, recover, fix and repair Sony MEX-BT2900 / MEX-BT2950 Car Audio. Information contained in Sony MEX-BT2900 / MEX-BT2950 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.