Sony XR-3740 Car Stereo Manual

The Sony XR-3740 is a high-performance car stereo featuring a digital media receiver with AM/FM tuner, Bluetooth connectivity for hands-free calling and audio streaming, USB port for iPod/iPhone and USB memory devices, auxiliary input, 4 x 50W high-power output, customizable illumination (red/white/green), detachable faceplate security, CD/MP3/WMA playback, and advanced audio controls with EQ presets. 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. Bluetooth Features 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital media receiver, Remote Control, Front panel with detachable face, USB port, AUX IN, Microphone input, Speaker outputs.

Feature	Description
Bluetooth	For hands-free calling and wireless audio streaming
USB port	For iPod/iPhone connectivity and USB memory playback
AUX IN jack	For external audio devices (3.5mm)
AM/FM Tuner	30 station presets (18 FM, 12 AM)
Power Output	4 x 50W max (20W RMS)
Illumination	Selectable red, white, or green button lighting
Detachable Faceplate	Security feature to prevent theft
Audio Controls	Bass, Treble, Loudness, 5-band EQ presets
CD Playback	CD, CD-R, CD-RW, MP3, WMA
Remote Control	Included for convenient operation

Installation

Unpack and inspect contents. Ensure vehicle is parked with ignition off.

Disconnect negative battery terminal: For safety during installation.
Connect wiring harness: Match colors to vehicle harness (red to ignition, yellow to constant 12V, black to ground).
Connect speakers: Ensure proper polarity (+/-).
Connect antenna: Plug into rear antenna input.
Mount unit: Insert into DIN slot and secure with mounting sleeve.
Reconnect battery and test.

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

First-Time Setup

Power on unit; follow initial configuration.

Set illumination color: Press SOURCE + MENU, select COLOR, choose Red/White/Green.
Pair Bluetooth: Enable Bluetooth on phone, select "Sony XR-3740" from device list.
Program radio stations: Tune to desired station, press and hold preset button (1-6).
Adjust audio settings: Use AUDIO menu for bass, treble, EQ presets (Pop, Rock, Jazz, etc.).

CAUTION! Do not operate while driving. Perform setup with vehicle parked.

Specifications

Power Supply: 12V DC, negative ground.
Tuner: FM/AM with 30 presets.
Audio Output: 4 channels, 50W max per channel.
Frequency Response: 20Hz - 20kHz.
Signal-to-Noise Ratio: >80dB.
Supported Media: CD, CD-R/RW, MP3, WMA, USB memory.
Bluetooth Profiles: HFP, A2DP, AVRCP.
USB: Supports iPod/iPhone direct control, USB mass storage.
Dimensions: DIN size (178mm x 50mm).
Operating Temp: -20°C to +60°C.

Controls and Settings

Front Panel: POWER/VOLUME knob, SOURCE, MENU, EJECT, USB port, AUX IN.

Remote: POWER, Numeric buttons, SOURCE, VOLUME, MUTE, PLAY/PAUSE, TRACK UP/DOWN, MENU.

Audio Settings: BASS, TREBLE, LOUDNESS (On/Off), EQ presets (Flat, Pop, Rock, Jazz, Custom). Source Selection: FM/AM, CD, USB, BT AUDIO, AUX. Bluetooth: Pairing, call handling, phonebook access. Display: Dimmer control, illumination color. Security: Code setting (default 0000).

Connecting Devices

USB: Connect iPod/iPhone or USB memory. AUX: 3.5mm cable from external device. Bluetooth: Wireless pairing.

Turn ignition to ACC or ON position.
Select source (USB/AUX/BT).
For USB: Insert device; unit will read and begin playback.
For AUX: Connect cable to front AUX IN jack.
For Bluetooth: Pair as described in setup.

Tip: Use high-quality USB cables for reliable connection.

Playing Media

Supports CD, USB, Bluetooth audio, AUX.

Insert CD: Press EJECT, load disc label-side up.
Play: Press PLAY; skip tracks with TRACK UP/DOWN.
USB playback: Navigate folders with MENU/TRACK buttons.
Repeat/Random: Press RPT or RDM during playback.
Fast forward/rewind: Press and hold TRACK buttons.
Bluetooth audio: Select BT AUDIO source, control playback from phone or remote.
AUX: Select AUX source, control volume from head unit.

WARNING! Do not insert damaged discs. Avoid extreme temperatures for USB devices.

Bluetooth Features

Hands-free calling: Answer/end calls with remote or front panel. Phonebook access: Sync contacts for voice dialing. Audio streaming: Stream music from compatible devices. Last paired memory: Remembers up to 5 devices.

Care & Maintenance

Use soft, dry cloth for cleaning. Do not use solvents. Remove faceplate before cleaning. Keep vents clear of obstructions.

CAUTION! Do not spray cleaners directly on unit. Avoid moisture entering vents.

Regulatory Information

FCC ID: AK8XR3740. Complies with Part 15 of FCC rules. This device complies with Industry Canada licence-exempt RSS standard(s). Bluetooth is a trademark of Bluetooth SIG, Inc. Sony and the Sony logo are trademarks of Sony Corporation. For support, visit www.sony.com/audio or contact 1-800-222-7669.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Wiring/ignition	Check fuse (10A); verify yellow/red wires connected to 12V; ensure ignition is on.
No sound from speakers	Speaker connections	Verify speaker wires connected properly; check speaker impedance (4-8 ohms).
Bluetooth not pairing	Phone settings/distance	Enable Bluetooth visibility on phone; ensure within 3 feet; delete old pairing and retry.
USB not recognized	Format/compatibility	Use FAT32 formatted USB; ensure files are MP3/WMA; try different USB device.
CD skipping	Disc/dirty lens	Clean disc; use CD lens cleaner; avoid bumpy roads during playback.

Reset: Press RESET button on front with small pin.

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