Sony CDX-GT240 Car Stereo Manual

The Sony CDX-GT240 is a single-DIN car stereo with CD/MP3/WMA playback, AM/FM tuner, front auxiliary input, detachable faceplate security, 52W x 4 high power output, and customizable illumination. It features a 1-line LCD display, rotary volume knob, and compatibility with steering wheel remote controls (via adapter). Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Playing Media 8. Security Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Main unit, Detachable faceplate, Wiring harness, Mounting sleeve, User manual.

Feature	Description
CD/MP3/WMA Playback	Plays audio CDs, MP3, and WMA files from CD-R/RW
AM/FM Tuner	18 FM/6 AM presets, automatic station search
Front AUX Input	3.5mm jack for portable audio devices
Detachable Faceplate	Security feature to prevent theft
Power Output	52W x 4 (max), 17W x 4 (RMS)
Illumination	Adjustable button/display colors (Red/Green/Amber)
LCD Display	1-line with track/station information
Rotary Volume Knob	Easy volume adjustment
Fader/Balance Control	Adjusts front/rear and left/right sound
Clock	Digital clock display

Installation

Unpack and inspect contents. Ensure vehicle is off and battery disconnected.

Remove existing stereo: Use removal tools for factory unit.
Connect wiring harness: Match colors (Red: ignition, Yellow: constant 12V, Black: ground, etc.).
Connect antenna plug: Push firmly into antenna socket.
Slide unit into dash: Use mounting sleeve for secure fit.
Reconnect battery and test functions.

WARNING! Disconnect negative battery terminal first. Ensure all connections are secure and insulated.

First-Time Setup

Power on unit; follow initial settings.

Set clock: Press and hold CLOCK, adjust with TUNE/SEEK.
Program radio presets: Tune to station, press and hold preset button (1-6).
Adjust illumination: Press SOURCE to turn off, then hold AUDIO to select color.
Set audio preferences: Use AUDIO menu for bass/treble/fader/balance.

CAUTION! Do not operate while driving. Park vehicle for setup.

Specifications

Power Supply: 12V DC, negative ground.
Output Power: 52W x 4 max (17W x 4 RMS).
Disc Formats: CD, CD-R/RW, MP3, WMA.
Tuner: FM 87.5-108 MHz, AM 530-1710 kHz.
Audio Input: Front 3.5mm AUX.
Display: 1-line LCD with backlight.
Illumination: Red, Green, Amber selectable.
Dimensions: Single-DIN (178mm x 50mm x 159mm).
Operating Temp: -10°C to +60°C.

Controls and Settings

Front Panel: POWER/VOLUME knob, SOURCE, AUDIO, MENU, TUNE/SEEK, BAND, numeric buttons 1-6.

Detachable Faceplate: Remove by pressing RELEASE buttons on sides.

Audio Settings: BASS, TREBLE, FADER, BALANCE via AUDIO button. Display: Clock setting, illumination color. Tuner: Preset memory, local/distance reception. CD/MP3: Repeat, random, scan modes.

Connecting Devices

AUX Input: Front 3.5mm jack for phones/MP3 players. Antenna: Standard car antenna plug.

Turn off unit before connecting devices.
Plug 3.5mm cable into front AUX input.
Select AUX source by pressing SOURCE.
Control playback from connected device.

Tip: Use high-quality cables for best audio. Ensure device volume is set appropriately.

Playing Media

Supports audio CDs, MP3/WMA CDs.

Insert disc: Label side up, into slot.
Play: Automatically starts; use TUNE/SEEK for track skip.
MP3/WMA navigation: Press FOLDER to navigate directories.
Repeat/Random: Press RPT or RDM during playback.
Scan: Press SCN to sample tracks.
Eject: Press EJECT button.

WARNING! Do not insert damaged discs. Avoid extreme temperatures. Do not use while driving if distracting.

Security Features

Detachable Faceplate: Remove when parked to deter theft. Security Code: Optional code can be set (see manual).

Care & Cleaning

Use soft, dry cloth for cleaning. For stubborn stains, dampen cloth slightly with water.

CAUTION! Do not use solvents or abrasive cleaners. Never spray liquids directly on unit.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. ICES-003: Complies with Canadian standards. Copyright © Sony Corporation. For support, visit www.sony.com/electronics/support or contact 1-800-222-7669.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Blown fuse/wiring	Check car fuse (10-15A); verify wiring connections (Red/Yellow/Black).
No sound	Mute/speakers	Check mute; ensure speakers connected properly; adjust volume.
Disc not playing	Disc format/damage	Ensure disc is compatible (CD, MP3, WMA); clean disc; check for scratches.
Poor radio reception	Antenna connection	Ensure antenna plug fully inserted; check antenna for damage.
Faceplate not attaching	Dirt/misalignment	Clean connectors on unit and faceplate; align properly and push until click.

Reset: Disconnect battery for 1 minute to reset unit (note: may lose presets).

Service: 1-800-222-7669; www.sony.com/electronics/support