Sony CDX-GT48UM - User Manual

SERVICE MANUAL
Sony Corporation
Audio&Video Business Group
Published by Sony Techno Create Corporation
CDX-GT48UM/GT480U/
GT480US/GT484US
FM/AM COMPACT DISC PLAYER
9-889-365-01
2008K04-1
©
2008.11
E Model
CDX-GT480U/GT480US
Indian Model
CDX-GT48UM/GT484US
Ver. 1.0 2008.11
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 (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
FM tuning interval: 50 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
AM
Tuning range:
531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)
AM tuning interval: 9 kHz/10 kHz switchable
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 25 kHz
Sensitivity: 26 μV
USB Player section
Interface: USB (Full-speed)
Maximum current: 500 mA
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, sub/rear switchable)
Power antenna (aerial) relay control terminal
Power amplifi er control terminal
Inputs:
Remote controller input terminal
Antenna (aerial) input terminal
AUX input jack (stereo mini jack)
USB signal input terminal
Model Name Using Similar Mechanism NEW
CD Drive Mechanism Type MG-101Y-188//C
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:
Card remote commander: RM-X151
Parts for installation and connections (1 set)
Design and specifi cations are subject to change
without notice.
Photo: CDX-GT480US

Summary

SPECIFICATIONS

PLAYER SECTIONS

Details on CD, USB, and amplifier sections.

TUNER AND RADIO SECTIONS

FM and AM tuner specifications.

GENERAL AND POWER DETAILS

General specs, power, dimensions, and accessories.

SERVICE NOTE

EXTENSION CABLE AND SERVICE POSITION

Instructions on connecting a jig for servicing.

REPLACEMENT PROCEDURES

Guides for replacing USB connector and servo board.

CONNECTOR HANDLING

Precautions for 20-pin connector.

GENERAL

LOCATION OF CONTROLS

Identifies controls on the unit and remote.

CONNECTIONS

Details on wiring and connections.

DISASSEMBLY

DISASSEMBLY SEQUENCE

Overview of the disassembly order.

SUB PANEL & CD MECHANISM DISASSEMBLY

Steps for sub panel and CD mechanism.

BOARD & CHASSIS DISASSEMBLY

Procedures for main, servo boards, and chassis.

ARM, MOTOR, & PICK-UP DISASSEMBLY

Steps for roller arm, sled motor, and pick-up.

DIAGRAMS

BLOCK DIAGRAMS

Diagrams showing system signal flow.

PRINTED WIRING BOARDS

Layouts for main and key boards.

SCHEMATIC DIAGRAMS

Detailed circuit schematics.

IC BLOCK DIAGRAMS

Diagrams for specific integrated circuits.

EXPLODED VIEWS

MAIN SECTION

Exploded view of the main assembly.

FRONT PANEL SECTION

Exploded view of the front panel.

CD MECHANISM SECTION

Exploded view of the CD mechanism.

ELECTRICAL PARTS LIST

COMPONENT LISTINGS

Lists various electronic components by type.

CONNECTORS, DIODES, AND ICs

Lists connectors, diodes, ICs, and related components.

TRANSISTORS AND RESISTORS

Lists transistors and resistors.

SWITCHES, ABSORBERS, AND MISCELLANEOUS

Lists switches, surge absorbers, and other parts.

ACCESSORIES AND INSTALLATION PARTS

Lists accessories and installation parts.

Sony CDX-GT48UM Specifications

General

Tuner Bands	FM/AM
Tuner	Yes
Preset Stations	30
CD Playback	Yes
MP3 Playback	Yes
WMA Playback	Yes
AAC Playback	Yes
USB Port	Yes
Bluetooth	No
AUX Input	Yes
Display Type	LCD
Display Number of Lines	1
Display	Yes
Equalizer	Yes
Pre-out Voltage	2.5V
Removable Front Panel	Yes
Detachable Faceplate	Yes
Product Colour	Black
Power Output	52 W
RMS Power	17 Watts x 4