CDX-GT720, CDX-GT72W, CDX-GT770 - Sony Car Audio Service Manual (repair manual)

cdx-gt720, cdx-gt72w, cdx-gt770 service manual
Model
CDX-GT720 CDX-GT72W CDX-GT770
Pages
54
Size
7.68 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
cdx-gt720-cdx-gt72w-cdx-gt770.pdf
Date

Read Sony CDX-GT720 / CDX-GT72W / CDX-GT770 Service Manual online

SERVICE MANUAL
Published by Sony Techno Create Corporation
Sony Corporation
Audio Business Group
SPECIFICATIONS
FM/AM COMPACT DISC PLAYER
9-887-940-01
2007L04-1
© 
2007.12
US Model
CDX-GT72W/GT720
E Model
CDX-GT770
Ver. 1.0  2007.12
Model Name Using Similar Mechanism
NEW
CD Drive Mechanism Type
MG-101FC-188//Q
Optical Pick-up Name
DAX-25A
•  The tuner and CD sections have no adjustments.
(Photo: CDX-GT720)
CD Player section
Signal-to-noise ratio: 120 dB
Frequency response: 10 – 20,000 Hz
Wow and fl utter: Below measurable limit
Tuner section
FM
Tuning range:
 CDX-GT72W/GT720:
  87.5 – 107.9 MHz
 CDX-GT770:
  87.5 – 108.0 MHz (at 50 kHz step)
  87.5 – 107.9 MHz (at 200 kHz step)
FM tuning interval:
 CDX-GT770:
  50 kHz/200 kHz switchable
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Usable sensitivity: 9 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 
  67 dB (stereo), 69 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
AM
Tuning range:
 
 CDX-GT72W/GT720:
  530 – 1,710 kHz
 CDX-GT770:
  531 – 1,602 kHz (at 9 kHz step)
  530 – 1,710 kHz (at 10 kHz step)
AM tuning interval:
 CDX-GT770:
  9 kHz/10 kHz switchable
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 
μV
Power amplifi er 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 terminal (front/rear)
  Subwoofer output terminal (mono)
  Power antenna (aerial) relay control terminal
 Power 
amplifi er control terminal
Inputs:
  Telephone ATT control terminal
  Illumination control terminal
  BUS control input terminal
  BUS audio input 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 × 190 mm
 (7
 1/8
 × 2 × 7
 1/2
 in.) (w/h/d)
Mounting dimensions: 
  Approx. 182 × 53 × 163 mm
 (7
 1/4
 × 2
 1/8
 × 6
 1/2
 in.) (w/h/d)
Mass: Approx. 1.6 kg (3 lb 9 oz)
Supplied accessories:
  Card remote commander: 
 RM-X152 
(CDX-GT72W/GT720)
 RM-X156 
(CDX-GT770)
  Parts for installation and connections (1 set)
Design and specifi cations are subject to change
without notice.
AUDIO POWER SPECIFICATIONS 
(CDX-GT72W/GT720)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23.2 watts per channel minimum continuous average power into 
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more 
than 5% total harmonic distortion.
CDX-GT72W/GT720/GT770
CDX-GT72W/GT720/GT770
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.
NOTES ON HANDLING THE OPTICAL PICK-UP 
BLOCK   OR  BASE  UNIT
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
The laser beam on this model is concentrated so as to be focused 
on the disc refl ective surface by the objective lens in the optical 
pickup block. Therefore, when checking the laser diode emission, 
observe from more than 30 cm away from the objective lens.
SERVICE  NOTES
CAUTION
Use of controls or adjustments or performance of procedures other than 
those specifi ed herein may result in hazardous radiation exposure.
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.
TEST  DISCS
Please use the following test discs for the check on the CD section.
 
YDES-18 (Part No. 3-702-101-01)
 
PATD-012 (Part No. 4-225-203-01)
SAFETY-RELATED COMPONET 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  COM-  POSANTS  QUE  
PAR  DES  PIÈCES  SONY  DONT  LES  NUMÉROS  SONT  DON-
NÉS  DANS  CE  MANUEL  OU  DANS  LES  SUPPLÉMENTS  
PUBLIÉS  PAR  SONY.
optical pick-up
semi-fixed resistor
CDX-GT72W/GT720/GT770
3
1. 
SERVICE  NOTE
  .....................................................   4
2. GENERAL
 
Location of Controls .......................................................   5
 Connections 
....................................................................  
6
3. DISASSEMBLY
3-1. Base 
Panel 
Assy 
..............................................................  13
3-2.   Sub Panel Assy  ...............................................................   13
3-3.   CD Mechanism Block .....................................................   14
3-4.  Driving Section (DB-F07) ..............................................   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 Section ..................................................   19
3-13. Optical Pick-up ...............................................................   19
4. 
DIAGNOSIS  FUNCTION 
 .....................................   20
5. DIAGRAMS
5-1.  Block Diagram –Main Section– .....................................   23
5-2.  Block Diagram –Display Section– .................................   24
5-3.  Printed Wiring Boards –Main Section (1/2)– .................   26
5-4.  Printed Wiring Board –Main Section (2/2)– ...................   27
5-5.  Schematic Diagram –Main Section (1/4)– ......................   28
5-6.  Schematic Diagram –Main Section (2/4)– ......................   29
5-7.  Schematic Diagram –Main Section (3/4)– ......................   30
5-8.  Schematic Diagram –Main Section (4/4)– ......................   31
5-9.  Printed Wiring Board –Base Panel Section- ...................   32
5-10.  Schematic Diagram –Base Panel Section- ......................   33
5-11.  Printed Wiring Boards –Display Section– ......................   34
5-12.  Schematic Diagram –Display Section– ..........................   35
6. 
EXPLODED  VIEWS
6-1. Main 
Section 
...................................................................  43
6-2.  Main Board Section  .......................................................   44
6-3. Front 
Section 
...................................................................  45
6-4.  CD Mechanism Section (MG-101FC-188//Q) ...............   46
7. 
ELECTRICAL  PARTS  LIST
  ..............................   47
TABLE  OF  CONTENTS
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.
This compact disc player is classifi ed as a CLASS 1 LASER      
product. The CLASS 1 LASER PRODUCT label is located on the 
exterior.
CDX-GT770:
This label is located on the bottom of the chassis.
• CD playback
You can play CD-DA (also containing CD TEXT), CD-R/CD-
RW (MP3/WMA/AAC fi les).
Type of discs
Label on the disc
CD-DA
MP3
WMA
AAC
CDX-GT72W/GT720/GT770
4
SECTION  1
SERVICE  NOTE
EXTENSION  CABLE  AND  SERVICE  POSITION
When repairing or servicing this set, connect the jig (extension 
cable) as shown below.
•  Connect the MAIN board (CNP301) and the SERVO board 
(CN2) with the extension cable (Part No. J-2502-076-1).
NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board (A-1177-362-A) 
should be replaced since any parts in the SERVO board cannot be 
repaired.
NOTE  FOR  THE  OPENING  OF  THE  FRONT  PANEL
In this set, the front panel is lowered to below the bottom face 
when it is opened.
When servicing the set, place it on a stand having a height of about 
2 cm.
SERVO BOARD
CN2
MAIN BOARD
CNP301
J-2502-076-1
stand
Page of 54
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Here you can read online and download Sony CDX-GT720 / CDX-GT72W / CDX-GT770 Service Manual in PDF. CDX-GT720 / CDX-GT72W / CDX-GT770 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony CDX-GT720 / CDX-GT72W / CDX-GT770 Car Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.