Sony CDX-GT680UI Car Stereo Manual

The Sony CDX-GT680UI is an in-dash CD receiver with USB direct control for iPod/iPhone, built-in MOSFET 50W x 4 amplifier, detachable faceplate security, CD-R/RW/MP3/WMA playback, 18 FM/6 AM presets, Quick-BrowZer navigation, and customizable illumination. Key sections include safety, features, installation, 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 & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Main unit, Detachable Faceplate, Remote Control, Wiring Harness, Installation Sleeve, User Manual.

Feature	Description
USB Direct Control	For iPod/iPhone playback and charging via USB cable
MOSFET 50W x 4 Amp	High-power built-in amplifier
Detachable Faceplate	Security feature to prevent theft
CD/MP3/WMA Playback	Plays CDs, CD-R/RW, MP3, and WMA files
18 FM/6 AM Presets	Stores favorite radio stations
Quick-BrowZer	Easy navigation of music files
Customizable Illumination	Adjust display color to match vehicle interior
Auxiliary Input	3.5mm jack for external audio devices
Steering Wheel Control Ready	Compatible with optional interface
EQ7 Sound Settings	Seven-band equalizer with preset sound fields

Installation

Unpack and verify all components. Ensure vehicle is parked with ignition off.

Disconnect negative battery terminal for safety.
Remove existing stereo (if any) using proper removal tools.
Connect wiring harness: Match colors (red to ignition, yellow to constant 12V, black to ground).
Connect antenna cable and USB extension (if routing to glove box).
Slide unit into dash sleeve and secure with brackets.
Reconnect battery and test functions before final assembly.

WARNING! Incorrect wiring can damage unit or vehicle electrical system. Consult professional if unsure.

First-Time Setup

After installation, power on the unit and configure initial settings.

Set clock: Press SOURCE to enter standby, then hold AUDIO to access clock setting.
Program radio presets: Tune to desired station, press and hold preset button (1-6/1-18).
Adjust illumination: Press AUDIO, select ILLUMINATION, choose color.
Set audio preferences: Use AUDIO menu to adjust EQ7, fader, balance.
For iPod/iPhone: Connect via USB for direct control and charging.

CAUTION! Do not operate while driving. Park vehicle to adjust settings.

Specifications

Power Output: 50W x 4 (MOSFET).
Supported Media: CD, CD-R/RW, MP3, WMA.
USB: 5V/1.5A output for iPod/iPhone.
Radio Tuner: FM/AM with 18 FM and 6 AM presets.
Audio Input: 3.5mm auxiliary jack.
Preamp Outputs: Front/Rear/Subwoofer (optional).
Security: Detachable faceplate with carrying case.
Display: Multi-color LCD with adjustable dimmer.
Power Requirement: 12V DC, negative ground.
Operating Temp: -4°F to 158°F (-20°C to 70°C).

Controls and Settings

Front Panel: POWER/VOLUME knob, SOURCE, AUDIO, BAND, numbered buttons, OPEN/CLOSE.

Remote: POWER, VOLUME, MUTE, SOURCE, numbered buttons, UP/DOWN, ENTER.

Audio Settings: EQ7 (ROCK, POP, JAZZ, etc.), Bass/Treble, Fader/Balance, Loudness. Radio: Manual/auto tuning, preset memory. Clock: 12/24 hour format. Illumination: Select from multiple colors. Playback: Repeat, shuffle, scan modes. Setup: Beep on/off, demo mode, reset.

Connecting Devices

USB: Connect iPod/iPhone for control/charging. Aux: 3.5mm cable to external player. Antenna: Standard car antenna plug.

Ensure unit is off before connecting devices.
For USB: Use genuine Sony cable for best compatibility.
Route cables safely away from moving parts or heat sources.
Select source: Press SOURCE to cycle through CD, USB, AUX, TUNER.

Tip: Use glove box or center console for neat USB/AUX cable storage.

Playing Media

Supports CD, USB (iPod/iPhone), AUX input.

Insert CD: Press OPEN/CLOSE, load disc label-side up.
USB playback: Connect device, press SOURCE to select USB.
Navigation: Use UP/DOWN or Quick-BrowZer to browse folders/tracks.
Play modes: Press PLAY MODE for repeat (1/ALL) or shuffle.
Scan: Press and hold UP/DOWN to scan through tracks.
Skip: Press UP/DOWN briefly for next/previous track.
Pause: Press PAUSE during playback.
Eject: Press OPEN/CLOSE to remove CD.

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

Security Features

Detachable Faceplate: Remove when parked to deter theft. Security Code: Optional code can be set (default 0000).

Care & Maintenance

Use soft, dry cloth for cleaning. Do not use solvents or abrasive cleaners.

CAUTION! Store faceplate in protective case. Avoid moisture and direct sunlight.

Regulatory Information

FCC Part 15: Class B digital device compliant. This device complies with part 15 of the FCC Rules. Copyright © Sony Corporation. iPod and iPhone are trademarks of Apple Inc. For support, visit www.sony.com/electronics/support or contact 1-800-222-7669.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Wiring/ignition	Check fuse, connections, and ensure ignition is on (red wire).
USB not recognized	Cable/device compatibility	Use genuine cable; ensure device is unlocked and supported.
Poor radio reception	Antenna connection	Ensure antenna plug is fully inserted; check antenna condition.
CD skips or ejects	Disc/dirty lens	Clean disc; use lens cleaner if problem persists.
No sound from speakers	Wiring/settings	Check speaker wires; ensure fader/balance not set to extreme.

Reset: Hold 1 and 4 while turning power on to reset to factory defaults.

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