WX-7700MDX — Sony Car Audio Service Manual (repair manual)

Model
WX-7700MDX
Pages
105
Size
8.5 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
wx-7700mdx.pdf
Date

View Sony WX-7700MDX Service Manual online

SERVICE MANUAL
MULTI CONTROL AUDIO MASTER
SPECIFICATIONS
WX-7700MDX
E Model
Ver 1.2  2003.10
9-874-054-03
Sony Corporation
2003J05-1
e Vehicle Company
C
 2003.10
Published by Sony Engineering Corporation
CD
Model Name Using Similar Mechanism
NEW
Section
CD Mechanism Type
MG-398D-121
Optical Pick-up Name
KSS-720A
MD
Model Name Using Similar Mechanism
NEW
Section
MD Mechanism Type
MG-164MF-138
Optical Pick-up Name
KMS-241C
US and foreign patents licensed from Dolby 
Laboratories.
CD/MD Player section
Signal-to-noise ratio
95 dB
Frequency response
10 – 20,000 Hz
Wow and flutter
Below measurable limit
Tuner section
FM
Tuning range
FM tuning interval:
50 kHz/200 kHz switchable
87.5 – 108.0 MHz
(at 50 kHz step)
87.5 – 107.9 MHz
(at 200 kHz step)
Aerial terminal
External aerial connector
Intermediate frequency
10.7 MHz/450 kHz
Usable sensitivity
8 dBf
Selectivity
75 dB at 400 kHz
Signal-to-noise ratio
66 dB (stereo), 
74 dB (mono)
Harmonic distortion at 1 kHz
0.4 % (stereo),
0.3 % (mono)
Separation
35 dB at 1 kHz/WIDE
Frequency response
30 – 15,000 Hz
AM
Tuning range
AM tuning interval:
9 kHz/10 kHz switchable
531 – 1,602 kHz
(at 9 kHz step)
530 – 1,710 kHz
(at 10 kHz step)
Aerial terminal
External aerial connector
Intermediate frequency
10.7 MHz/450 kHz
Sensitivity
30 
µV
Power amplifier section
Outputs
Speaker outputs 
(sure seal connectors)
Speaker impedance
4 – 8 ohms
Maximum power output
52 W 
× 4 (at 4 ohms)
General
Outputs
Audio outputs (front/rear)
Subwoofer output (mono)
Power aerial relay control 
terminal
Power amplifier control 
terminal
Inputs
Telephone ATT control 
terminal 
Illumination control 
terminal
BUS control input terminal
BUS audio input terminal
AUX IN terminal
Aerial input terminal
Power requirements
12 V DC car battery 
(negative earth)
Dimensions
Approx. 178 
× 100 × 194 
mm (w/h/d)
Mounting dimensions
Approx. 178 
× 100 × 165 
mm (w/h/d)
Mass
Approx. 3.0 kg
Supplied accessories
Parts for installation and 
connections (1 set)
Card remote commander
RM-X110
Note
This unit cannot be connected to a digital preamplifier 
or an equalizer.
Design and specifications are subject to change 
without notice.
2
WX-7700MDX
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  PUB-
LISHED  BY  SONY.
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 the soldering iron around 270 ˚C dur-
ing 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.
The laser diode in the optical pick-up block may suffer electro-
static breakdown because of the potential difference generated by
the charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
FOR  CD
NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
FOR  MD
NOTES ON LASER DIODE EMISSION CHECK
 Never look into the laser diode emission from right avove when
checking it for adustment. It is feared that you will lose your sight.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
(KMS-241C)
 The laser diode in the optical pick-up block may suffer electro-
static break-down easily. When handling it, perform soldering
bridge to the laser-tap on the flexible board. Also perform
m easur es against electrostatic break-down sufficiently before the
operation. The flexible board is easily damaged and should be
handled with care.
laser-tap
OPTICAL PICK-UP FLEXIBLE BOARD
NOTES  ON  HANDLING  THE  OPTICAL  PICK-
UP  BLOCK  OR  BASE  UNIT
Notes on CD-R/CD-RW discs
• You  can  play CD-Rs (recordable CDs)/CD-
RWs (rewritable CDs) designed for audio use 
on this unit.
Look for these marks to distinguish CD-Rs/
CD-RWs for audio use.
These marks denote that a disc is not for audio 
use.
• Some  CD-Rs/CD-RWs (depending on the 
equipment used for its recording or the 
condition of the disc) may not play on this unit.
• You  cannot play a CD-R/a CD-RW that is not 
finalized*.
*
A process necessary for a recorded CD-R/CD-RW 
disc to be played on the audio CD player.
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 flow) 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.
3
WX-7700MDX
1.
SERVICING NOTES
................................................
4
2.
GENERAL
Location of Controls .......................................................
5
3.
DISASSEMBLY
3-1. Disassembly Flow ........................................................... 10
3-2. Front Panel Section ......................................................... 11
3-3. DISPLAY Board ............................................................. 11
3-4. Chassis (T) Section ......................................................... 12
3-5. MD Mechanism Deck (MG-164MF-138) ...................... 12
3-6. POWER Board, Chassis (T) Assy .................................. 13
3-7. Heat Sink ......................................................................... 13
3-8. SERVO (MD) Board ....................................................... 14
3-9. MD Cover Assy ............................................................... 14
3-10. Float Block ...................................................................... 15
3-11. LO Motor Assy ................................................................ 15
3-12. Lever Assy (LE) .............................................................. 16
3-13. Holder Assy ..................................................................... 16
3-14. Chucking ARM Assy ...................................................... 17
3-15. Optical Pick-up (KMS-241C) ......................................... 17
3-16. SL Motor Assy (SLED) (M902)/
SP Motor Assy (SPINDLE) (M901) ............................... 18
3-17. CD Mechanism Deck (MG-398D-121) .......................... 18
3-18. Motor Assy (Front Panel Open/Close) (M640) .............. 19
3-19. MAIN Board, Chassis (B) Assy ..................................... 19
3-20. Bracket (MAIN) .............................................................. 20
3-21. Chassis (T388) Assy ....................................................... 20
3-22. Sensor (CD) Board .......................................................... 21
3-23. Servo Board, LO Motor SUB Assy (Loading)
(M103) ............................................................................. 21
3-24. ARM Roller Assy, LOAD Board .................................... 22
3-25. Floating Block Assy ........................................................ 22
3-26. Optical Pick-up (KSS-720A), Sled Motor Assy
(M101) ............................................................................. 23
4.
ASSEMBLY
4-1. Assembly of ARM (L/R) Assy ....................................... 23
5.
DIAGRAMS
5-1. Block Diagram  – CD SERVO Section – ....................... 24
5-2. Block Diagram  – MD SERVO Section – ...................... 25
5-3. Block Diagram  – MAIN Section – ................................ 26
5-4. Block Diagram
– DISPLAY/BUS CONTROL Section – ........................ 27
5-5. Block Diagram  – POWER SUPPLY Section – ............. 28
5-6. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 29
5-7. Printed Wiring Boards  – CD Section (1/2) – ................ 30
5-8. Printed Wiring Board  – CD Section (2/2) – .................. 31
5-9. Schematic Diagram  – CD Section – .............................. 32
5-10. Printed Wiring Boards  – MD Section – ......................... 33
5-11. Schematic Diagram  – MD Section (1/2) – .................... 34
5-12. Schematic Diagram  – MD Section (2/2) – .................... 35
5-13. Printed Wiring Boards
– MAIN Board (Component Side) – .............................. 36
5-14. Printed Wiring Board
– MAIN Board (Conductor Side) – ................................ 37
5-15. Schematic Diagram – MAIN Board (1/4) – ................... 38
5-16. Schematic Diagram – MAIN Board (2/4) – ................... 39
5-17. Schematic Diagram – MAIN Board (3/4) – ................... 40
5-18. Schematic Diagram – MAIN Board (4/4) – ................... 41
5-19. Printed Wiring Board
– DISPLAY Board (Component Side) – ........................ 42
5-20. Printed Wiring Boards
– DISPLAY Board (Conductor Side) – .......................... 43
5-21. Schematic Diagram – DISPLAY Board (1/2) – ............. 44
5-22. Schematic Diagram – DISPLAY Board (2/2) – ............. 45
5-23. Printed Wiring Board
– KEY Board (Component Side) – ................................. 46
5-24. Printed Wiring Board
– KEY Board (Conductor Side) – ................................... 47
5-25. Schematic Diagram  – KEY Board – ............................. 48
5-26. Schematic Diagram  – SUB/POWER Boards – ............. 49
5-27. Printed Wiring Board
– POWER Board (Component Side) – ........................... 50
5-28. Printed Wiring Boards  – POWER Board
(Conductor Side)/SUB Board – ...................................... 51
5-29. IC Pin Function Description ........................................... 63
6.
EXPLODED  VIEWS
6-1. MAIN Section ................................................................. 78
6-2. SUB Panel SUB Assy Section ........................................ 79
6-3. Front Panel Section ......................................................... 80
6-4. Front Panel SUB Section ................................................ 81
6-5. DISPLAY Board Section ................................................ 82
6-6. Chassis (T) Assy Section ................................................ 83
6-7. Chassis (B) Assy Section-1 ............................................. 84
6-8. Chassis (B) Assy Section-2 ............................................. 85
6-9. MD Mechanism Deck Section-1 (MG-164MF-138) ..... 86
6-10. MD Mechanism Deck Section-2 (MG-164MF-138) ..... 87
6-11. MD Mechanism Deck Section-3 (MG-164MF-138) ..... 88
6-12. CD Mechanism Deck Section-1 (MG-398D-121) ......... 89
6-13. CD Mechanism Deck Section-2 (MG-398D-121) ......... 90
6-14. CD Mechanism Deck Section-3 (MG-398D-121) ......... 91
7.
ELECTRICAL  PARTS  LIST
............................... 92
TABLE  OF  CONTENTS
4
WX-7700MDX
SECTION  1
SERVICING  NOTES
TEST DISC
This set can playback a CD-R, CD-RW for audio use.
When test this set, use the following test disc.
Test disc for CD-R: TCD-R082LMT (Part No.: J-2502-063-1)
Test disc for CD-RW: TCD-W082L (Part No.: J-2502-063-2)
OPENING  AND  CLOSING  OF  FRONT  PANEL  SECTION  IN  AN  ELECTRIC  INTERRUPTION  STATE
Don't apply impossible power, but open and close slowly with both hands.
front panel section
extension cable (main board-power board)
(J-2502-067-1)
CN403
CNP370
extension cable (main board-servo (CD) board)
(J-2502-062-1)
CN331
CN1
JIG  ON  REPAIRING
When repairing this set, etc., connect the extension cable as the figure shown below.
Page of 105
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Here you can view online or download Sony WX-7700MDX Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony WX-7700MDX Car Audio. Information contained in Sony WX-7700MDX service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).