Sony CDX-3250 Car Stereo Manual

The Sony CDX-3250 is a single-DIN car stereo featuring AM/FM radio with 18 FM and 6 AM presets, CD player with CD-R/RW playback capability, front auxiliary input for portable audio devices, detachable faceplate security, rotary volume control, bass/treble adjustments, and loudness function. 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 CD 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, Remote Control (optional), Wiring harness, Antenna connector, Front AUX input.

Feature	Description
AM/FM Tuner	18 FM and 6 AM station presets
CD Player	Plays audio CDs, CD-R, and CD-RW discs
Front AUX Input	3.5mm jack for connecting MP3 players or smartphones
Detachable Faceplate	Security feature to prevent theft
Rotary Volume Control	Easy volume adjustment knob
Bass/Treble Control	Adjustable audio tone settings
Loudness Function	Enhances bass at low volume levels
Power/Antenna Output	12V DC power and amplified antenna signal
Audio Outputs	Front and rear preamp outputs (2V)
Illumination	Green button illumination for night visibility

Installation

Disconnect vehicle battery before installation. Ensure proper mounting kit for your vehicle.

Remove existing stereo: Use DIN tools to release old unit from dashboard.
Connect wiring harness: Match colors (red=ignition, yellow=battery, black=ground).
Connect antenna: Plug antenna cable into rear of unit.
Connect speakers: Ensure proper polarity (positive/negative).
Secure unit: Slide into DIN slot until it clicks into place.
Reconnect battery and test functions.

WARNING! Ensure all connections are secure and insulated to prevent short circuits. Professional installation recommended.

First-Time Setup

After installation, reconnect battery and power on the unit.

Set clock: Press and hold CLOCK button, use TUNE/SEEK to adjust time.
Program radio presets: Tune to desired station, press and hold preset button (1-6 for AM, 1-18 for FM).
Adjust audio settings: Use BASS/TREBLE controls to set preferred tone.
Test CD playback: Insert audio CD to verify proper operation.
Test AUX input: Connect device to front jack and select AUX mode.

CAUTION! Do not operate while driving. Park vehicle in safe location during setup.

Specifications

Power Output: 50W x 4 max (17W RMS x 4).
Tuner: AM/FM with 18 FM and 6 AM presets.
CD Compatibility: Audio CD, CD-R, CD-RW.
Audio Input: Front 3.5mm AUX jack.
Preamp Outputs: Front and rear (2V).
Security: Detachable faceplate.
Display: LCD with backlight.
Power Requirements: 12V DC, negative ground.
Dimensions: 178mm(W) x 50mm(H) x 159mm(D) (single DIN).

Controls and Settings

Front Panel: POWER/VOLUME knob, SOURCE button, BAND button, TUNE/SEEK buttons, BASS/TREBLE buttons, LOUDNESS button, CLOCK button, AUX jack.

Remote (optional): POWER, VOLUME, SOURCE, PRESET, TUNE/SEEK, PLAY/PAUSE, STOP.

Audio Settings: BASS (-10 to +10), TREBLE (-10 to +10), LOUDNESS (On/Off). Radio: Manual tuning with TUNE buttons, seek tuning with SEEK buttons, preset memory. CD: PLAY/PAUSE, STOP, SKIP (TRACK UP/DOWN), REPEAT, RANDOM. System: Clock setting, display dimmer, reset function.

Connecting Devices

AUX Input: Front 3.5mm jack for portable audio players. External Amplifier: Use preamp outputs (front/rear).

Turn off vehicle ignition before connecting devices.
For AUX: Connect 3.5mm cable from device to front jack.
For amplifier: Connect RCA cables from preamp outputs to amplifier inputs.
Select source: Press SOURCE until AUX appears on display.

Tip: Use quality shielded cables for best audio performance and to reduce noise.

Playing CD Media

Supports audio CDs, CD-R, CD-RW (with MP3/WMA files if compatible).

Insert disc: Press EJECT button, load CD with label side up.
Play: Press PLAY or close tray; unit will start playback automatically.
Skip tracks: Press TRACK UP/DOWN buttons.
Fast forward/reverse: Press and hold TRACK buttons during playback.
Repeat: Press REPEAT button for track or disc repeat.
Random: Press RANDOM for shuffle playback.
Stop: Press STOP; press EJECT to remove disc.
Resume: Unit remembers last playback position after stop.

WARNING! Do not use damaged or irregular shaped discs. Do not insert foreign objects into CD slot.

Security Features

Detachable Faceplate: Remove faceplate when leaving vehicle to deter theft. Security Code: Optional code can be set (see manual for programming).

Care & Cleaning

Disconnect battery before cleaning. Use soft, dry cloth for faceplate and display. For stubborn dirt, use cloth slightly dampened with water.

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

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. 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); verify wiring connections (red/yellow/black).
No sound from speakers	Speaker wiring/settings	Check speaker connections; ensure volume not muted; verify source selection.
Radio poor reception	Antenna connection	Ensure antenna cable fully inserted; check antenna condition.
CD won't play	Disc/format issue	Ensure disc is clean, not scratched; verify disc format (audio CD only for basic models).
Faceplate won't attach	Alignment/obstruction	Clean connectors on faceplate and unit; align properly and push until click.
AUX input not working	Cable/volume	Check cable connection; ensure device volume is up; select AUX source.

Reset: Disconnect battery for 5 minutes to reset unit memory.

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