Sony CDX-GT340 Car Stereo Manual

The Sony CDX-GT340 is a single-DIN car stereo featuring a CD/MP3/WMA player, AM/FM tuner with 18 FM/12 AM presets, front auxiliary input, detachable faceplate security, 52W x 4 high power output, and a customizable display. It supports CD-R/RW playback, features a bass boost system, and includes a wired remote control input. 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 with CD slot, Detachable Faceplate, Wired Remote Control Input, Front AUX Input, Rear pre-out connectors, and wiring harness.

Feature	Description
CD/MP3/WMA Playback	Plays standard audio CDs and CD-R/RW with MP3/WMA files
AM/FM Tuner	18 FM and 12 AM station presets
Front AUX Input	3.5mm jack for connecting portable audio devices
Detachable Faceplate	Security feature to prevent theft
Power Output	52W x 4 channels (max)
Bass Boost System	Enhances low-frequency response
Wired Remote Input	For optional Sony wired remote control
Display	Customizable illumination (Green/Red/Amber)
Audio Controls	Bass, Treble, Balance, Fader
Power & Volume Knob	Combined power on/off and volume control

Installation

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

Remove existing stereo: Use DIN tools to release and remove old unit.
Connect wiring harness: Match colors (Red: 12V Ignition, Yellow: 12V Battery, Black: Ground, etc.).
Connect speakers: Ensure correct polarity (positive/negative wires).
Connect antenna plug to rear antenna input.
Secure unit in dash: Insert mounting sleeve, then slide stereo into place.
Reconnect vehicle battery and test functions.

WARNING! Disconnect vehicle battery before installation to prevent short circuits. Ensure all connections are secure and insulated.

First-Time Setup

Reconnect battery, turn on ignition, and power on the stereo.

Set the clock: Press and hold the DISP button until clock blinks, use TUNE/SEEK to adjust.
Program radio presets: Tune to desired station, press and hold a preset button (1-6) for 2 seconds.
Adjust audio settings: Use SOUND button to cycle through Bass, Treble, Balance, Fader.
Set display color: Press and hold DISP to enter setting mode, use TUNE/SEEK to select color (Green/Red/Amber).
Attach faceplate: Align and press until it clicks into place.

CAUTION! Do not force the faceplate. Ensure ignition is on for setup procedures.

Specifications

Chassis Size: Single DIN (50 x 178 mm).
Power Output: 52W x 4 (Max), 17W x 4 (RMS).
Tuner: FM/AM with 18 FM & 12 AM presets.
Playback Formats: Audio CD, CD-R/RW, MP3, WMA.
Frequency Response: 20 Hz - 20 kHz.
Signal-to-Noise Ratio: >90 dB (CD).
Inputs:Front 3.5mm AUX, Rear RCA pre-out (optional), Wired remote input.
Power Requirement: 12V DC, negative ground.
Display: Multi-color (Green/Red/Amber) LCD.
Security: Detachable faceplate.

Controls and Settings

Front Panel: POWER/VOL knob, SRC (Source) button, SOUND (Audio menu), TUNE/SEEK, Number buttons 1-6, EJECT, AUX input.

Remote (Optional): Basic playback and volume controls.

Audio Settings: Bass (-10 to +10), Treble (-10 to +10), Balance (L/R), Fader (F/R). Radio: Manual tuning, Seek, Preset memory. Display: Clock setting, Color selection (Green/Red/Amber). Playback: Repeat (Track/All), Random play, Intro Scan. Setup: Reset function (returns to factory defaults).

Connecting Devices

AUX Input: Front 3.5mm jack for portable players. Pre-Out: Rear RCA connectors for external amplifier.

Turn off stereo and vehicle ignition before connecting.
AUX: Plug 3.5mm cable from device into front AUX IN jack. Press SRC to select AUX mode.
Amplifier: Connect RCA cables from rear pre-out to amplifier inputs.
Wired Remote: Plug optional remote into designated port on rear.

Tip: Use a high-quality 3.5mm cable for best AUX audio performance.

Playing Media

Supports Audio CDs, CD-R/RW with MP3/WMA files.

Insert disc: Press EJECT, load CD label-side up.
Play: Press SRC to select CD mode; playback starts automatically.
Skip Tracks: Press TUNE/SEEK up or down briefly.
Fast Search: Press and hold TUNE/SEEK during playback.
Repeat/Random: Press SOUND repeatedly to access play modes (REP ALL, RANDOM).
Intro Scan: Press and hold TUNE/SEEK for 10 seconds to play first 10 seconds of each track.
MP3/WMA Navigation: Use TUNE/SEEK to skip folders/files.
Eject: Press EJECT to remove disc.

WARNING! Do not insert damaged or irregular-shaped discs. Do not use in extreme temperatures.

Security Features

Detachable Faceplate: Remove by pressing release button and pulling faceplate off. Store in protective case. Anti-Theft LED: Flashes when faceplate is removed to deter theft.

Care & Cleaning

Disconnect battery or remove faceplate before cleaning. Use soft, dry cloth for faceplate and display. For stubborn dirt, dampen cloth slightly with water. Do not use solvents.

CAUTION! Never spray liquids directly onto the unit. Keep faceplate away from excessive heat or moisture.

Regulatory Information

FCC Part 15: Class B digital device; complies with limits for vehicular use. This device complies with part 15 of the FCC Rules. Copyright © Sony Corporation. For support, visit www.sony.com/electronics/support or contact Sony customer service at 1-800-222-7669.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Blown fuse / wiring	Check vehicle fuse (usually 10A-15A); verify wiring connections (Red/Yellow/Black).
No sound from speakers	Speaker wires / settings	Check speaker connections and polarity; ensure Balance/Fader not set to extreme.
Radio poor reception	Antenna connection	Ensure antenna cable is fully plugged into rear; check antenna condition.
CD won't play	Disc format / dirty lens	Ensure disc is compatible (CD-DA, MP3, WMA); try a commercial audio CD; use lens cleaning disc if skipping.
Faceplate won't attach	Misalignment / debris	Clean connectors on unit and faceplate; align carefully and press firmly until click.
AUX input not working	Source mode / cable	Press SRC to select AUX mode; ensure cable is fully inserted at both ends.

Reset: Turn unit off. Press and hold the 1 and 6 preset buttons while turning the unit on. Release buttons after display resets.

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