CDX-GT420U, CDX-GT424U, CDX-GT427UE, CDX-GT470U, CDX-GT470US - Sony Car Audio Service Manual (repair manual)

cdx-gt420u, cdx-gt424u, cdx-gt427ue, cdx-gt470u, cdx-gt470us service manual
Model
CDX-GT420U CDX-GT424U CDX-GT427UE CDX-GT470U CDX-GT470US
Pages
48
Size
5.32 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
cdx-gt420u-cdx-gt424u-cdx-gt427ue-cdx-gt470u-cdx-g.pdf
Date

Read Sony CDX-GT420U / CDX-GT424U / CDX-GT427UE / CDX-GT470U / CDX-GT470US Service Manual online

SERVICE MANUAL
Published by Sony Techno Create Corporation
Sony Corporation
Audio Business Group
SPECIFICATIONS
FM/MW/SW COMPACT DISC PLAYER
CDX-GT470U/GT470US
9-887-917-02
2008A04-1
© 
2008.01
US Model
CDX-GT420U
AEP Model
UK Model
CDX-GT420U/GT424U
E Model
CDX-GT470U/GT470US
Russian Model
CDX-GT420U/GT427UE
Ver. 1.1  2008.01
Model Name Using Similar Mechanism
NEW
CD Drive Mechanism Type
MG-101I-188//Q
Optical Pick-up Name
DAX-25A
•  The tuner and CD sections have no adjustments.
CDX-GT420U/GT424U/GT427UE
GT470U/GT470US
(Photo: CDX-GT424U)
FM/MW/LW COMPACT DISC PLAYER
CDX-GT420U: AEP, UK, Russian model/GT424U/GT427UE
FM/AM COMPACT DISC PLAYER
CDX-GT420U: US model
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-GT420U: US model:
  87.5 – 107.9 MHz
  CDX-GT420U: AEP, UK, Russian model/
 GT424U:
  87.5 – 108.0 MHz
  CDX-GT470U: E, indian model/GT470US:
  87.5 – 108.0 MHz (at 50 kHz step)
  87.5 – 107.9 MHz (at 200 kHz step)
  CDX-GT470U: Saudi Arabian model:
  87.5 – 108.0 MHz (at 50 kHz step)
 CDX-GT427UE:
  FM1/FM2: 87.5 – 108.0 MHz (at 50 kHz 
step)
  FM3: 65 – 74 MHz (at 30 kHz step)
FM tuning interval:
  CDX-GT470U: E, indian model/GT470US:
  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
CDX-GT420U: US model:
Tuning range: 530 – 1,710 kHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 
μV
MW/LW
CDX-GT420U: AEP, UK, Russian model/
GT424U/GT427UE:
Tuning range:
  MW: 531 – 1,602 kHz
  LW: 153 – 279 kHz
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency:
  10.7 MHz/450 kHz
Sensitivity:
 MW: 
30 
μV, LW: 40 μV
– Continued on next page –
AUDIO POWER SPECIFICATIONS 
(CDX-GT420U: US model)
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-GT420U/GT424U/GT427UE/GT470U/GT470US
2
MW
CDX-GT470U/GT470US:
Tuning range:
  CDX-GT470U: E, indian model/GT470US:
  531 – 1,602 kHz (at 9 kHz step)
  530 – 1,710 kHz (at 10 kHz step)
  CDX-GT470U: Saudi Arabian model:
  531 – 1,602 kHz (at 9 kHz step)
MW tuning interval:
  CDX-GT470U: E, indian model/GT470US:
  9 kHz/10 kHz switchable
Antenna (aerial) terminal:
  External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 
μV
SW
CDX-GT470U/GT470US:
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: 10.7 MHz/450 kHz
Sensitivity: 30 
μV
USB Player section
Interface: USB (Full-speed)
Maximum current: 500mA
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
Output:
  Audio outputs terminal (sub/rear switchable)
  Power antenna (aerial) relay control terminal
 Power 
amplifi er control terminal
Inputs:
  Telephone ATT control terminal 
  (CDX-GT420U: AEP, UK, Russian model/
 GT424U/GT427UE)
  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-X151
  Parts for installation and connections (1 set)
Design and specifi cations are subject to change
without notice.
Ver. 1.1
CDX-GT420U/GT424U/GT427UE/GT470U/GT470US
3
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.
optical pick-up
semi-fixed resistor
CDX-GT420U/GT424U/GT427UE/GT470U/GT470US
4
1. 
SERVICE  NOTE
  .....................................................   5
2. GENERAL
 
Location of Controls .......................................................   6
 Connections 
....................................................................  
8
3. DISASSEMBLY
3-1.   Sub Panel Assy  ...............................................................   13
3-2.   CD Mechanism Block .....................................................   13
3-3.   Main Board .....................................................................   14
3-4. Servo 
Board 
....................................................................  14
3-5. Chassis 
(T) 
Sub 
Assy 
......................................................  15
3-6.  Roller Arm Assy ..............................................................   15
3-7. Chassis 
(OP) 
Assy 
...........................................................  16
3-8.  Chucking Arm Sub Assy .................................................   16
3-9. Sled 
Motor 
Assy 
..............................................................  17
3-10.  Optical Pick-up Section ..................................................   18
3-11. Optical Pick-up ...............................................................   18
4. DIAGNOSIS 
 
FUNCTION 
 .....................................   19
5. DIAGRAMS
5-1.  Block Diagram –Main Section– .....................................   23
5-2.  Block Diagram –Display Section– .................................   24
5-3.  Printed Wiring Board –Main Section– ............................   26
5-4.  Schematic Diagram –Main Section (1/3)– ......................   27
5-5.  Schematic Diagram –Main Section (2/3)– ......................   28
5-6.  Schematic Diagram –Main Section (3/3)– ......................   29
5-7.  Printed Wiring Boards –Key Section– ............................   30
5-8.  Schematic Diagram –Key Section– ................................   31
6. 
EXPLODED  VIEWS
6-1. Main 
Section 
...................................................................  36
6-2.  Front Panel Section .........................................................   37
6-3.  CD Mechanism Section (MG-101I-188//Q) ...................   38
7. 
ELECTRICAL  PARTS  LIST
  ..............................   39
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.
Except GT420U: US model
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
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Here you can read online and download Sony CDX-GT420U / CDX-GT424U / CDX-GT427UE / CDX-GT470U / CDX-GT470US Service Manual in PDF. CDX-GT420U / CDX-GT424U / CDX-GT427UE / CDX-GT470U / CDX-GT470US service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony CDX-GT420U / CDX-GT424U / CDX-GT427UE / CDX-GT470U / CDX-GT470US 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.