CDX-GT24, CDX-GT28 — Sony Car Audio Service Manual (repair manual)

Model
CDX-GT24 CDX-GT28
Pages
36
Size
4.05 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
cdx-gt24-cdx-gt28.pdf
Date

View Sony CDX-GT24 / CDX-GT28 Service Manual online

SERVICE MANUAL
Sony Corporation
Audio&Video Business Group
Published by Sony Techno Create Corporation
CDX-GT24/GT28
FM/MW/LW COMPACT DISC PLAYER
9-889-306-01
2008J04-1
© 
2008.10
AEP Model
UK Model
Ver. 1.0  2008.10
SPECIFICATIONS
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: 
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 – 1602 kHz
  LW: 153 – 279 kHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: MW: 26 
μV, LW: 45μV
Power amplifi er section
Outputs:
 Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 45 W 
× 4 (at 4 ohms)
General
Outputs:
  Power antenna (aerial) relay control terminal
Inputs:
  Antenna (aerial) input terminal
  AUX input jack (stereo mini jack)
Model Name Using Similar Mechanism
NEW
CD Drive Mechanism Type
MG-101L-188//Q
Optical Pick-up Name
DAX-25A
•  The tuner and CD sections have no adjustments.
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))
Power supply voltage: 11 – 16 V
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:
  Parts for installation and connections (1 set)
Design and specifi cations are subject to change
without notice.
Photo: CDX-GT24
CDX-GT24/GT28
2
NOTES  ON  CHIP  COMPONENT  REPLACEMENT
 •  Never reuse a disconnected chip component.
 •  Notice that the minus side of a tantalum capacitor may be 
damaged by heat.
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.
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.
CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion 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.
optical pick-up
semi-fixed resistor
This compact disc player is classifi ed as a CLASS 1 LASER 
 
 
 
 
 
product. The CLASS 1 LASER PRODUCT label is located on the 
exterior.
This label is located on the bottom of the chassis.
CDX-GT24/GT28
3
Type of disc
Label on the disc
CD-DA
MP3
WMA
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.
 •  CD Play back
You can play CD-DA (also containing CD TEXT) and CD-
R/CD-RW (MP3/WMA fi les).
CDX-GT24/GT28
4
1. 
SERVICING  NOTES
 ..............................................   5
2. GENERAL
 
Location of Controls .......................................................   6
 Connections 
....................................................................  
7
3. DISASSEMBLY
3-1.   Sub Panel Assy  ...............................................................   9
3-2.   CD Mechanism Block .....................................................   9
3-3.   Main Board .....................................................................   10
3-4. Servo 
Board 
....................................................................  10
3-5.  Chassis (T) Sub Assy ......................................................   11
3-6.  Roller Arm Assy ..............................................................   11
3-7. Chassis 
(OP) 
Assy 
...........................................................  12
3-8.  Chucking Arm Sub Assy .................................................   12
3-9. Sled 
Motor 
Assy 
..............................................................  13
3-10.  Optical Pick-up Section ..................................................   14
3-11. Optical Pick-up ...............................................................   14
TABLE  OF  CONTENTS
4. DIAGRAMS
4-1.  Block Diagram –Main Section– .....................................   15
4-2.  Block Diagram –Display Section– .................................   16
4-3.  Printed Wiring Board –Main Section– ............................   17
4-4.  Schematic Diagram –Main Section (1/3)– ......................   18
4-5.  Schematic Diagram –Main Section (2/3)– ......................   19
4-6.  Schematic Diagram –Main Section (3/3)– ......................   20
4-7.  Printed Wiring Boards –Key Section– ............................   21
4-8.  Schematic Diagram –Key Section– ................................   22
5. EXPLODED 
VIEWS
5-1. Main 
Section 
...................................................................  28
5-2.  Front Panel Section .........................................................   29
5-3.  CD Mechanism Section (MG-101L-188//Q) ..................   30
6. 
ELECTRICAL PARTS LIST ..............................   31
Page of 36

Download Sony CDX-GT24 / CDX-GT28 Service Manual (Repair Manual)

Here you can view online or download Sony CDX-GT24 / CDX-GT28 Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony CDX-GT24 / CDX-GT28 Car Audio. Information contained in Sony CDX-GT24 / CDX-GT28 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).