The XOMAX XM-R279 is a car MP3 player with integrated radio, USB, and SD card support, designed for in-car entertainment.
Function Description
The device serves as a central unit for audio playback in a vehicle, offering multiple input sources and control options. Its primary functions include:
- MP3 Playback: Supports playback of MP3 files from USB drives and SD/MMC cards.
- Radio Tuner: Features an FM radio tuner with automatic and manual station search, as well as memory for storing preferred stations.
- Bluetooth (BT) Connectivity: Allows for wireless music streaming from mobile phones and hands-free calling (answer/ring off).
- Auxiliary Input (Aux In): Provides a 3.5mm jack for connecting external audio devices.
- USB Charging: Includes a dedicated USB slot for fast charging of mobile phones.
- Sound Customization: Offers various sound effects (Bass, Treble, Balance, Fader, Loudness) and equalizer presets (Pop, Rock, Class, Flat).
- Clock Display: Shows the current time and allows for adjustment.
Important Technical Specifications
Tuner Part:
- FM Frequency Range: 87.5MHz - 108MHz
- FM Noise-Limited Sensitivity: ≤26dB
- FM Signal to Noise Ratio (S/N): ≥45dB
USB/MMC/SD Part:
- Frequency Response: 100Hz - 10kHz (+10dB)
- MP3 Bit Rates: 8-320kbps
- Channel Balance: ≤3 dB
- Channel Separation: ≤22dB
- MP3 Signal to Noise Ratio (S/N): ≥55dB
General:
- Working Voltage: 12V DC
- Real Power Output: 4x60W/14.4V
- Speaker Impedance: 4-8Ω
- Size Dimension (W x H x L): 180mm x 52mm x 115mm
Usage Features
The XM-R279 offers a user-friendly interface with both front panel controls and a remote control for convenient operation.
Front Panel Controls:
- Power On/Off/Mode (1): Short press to power on, long press to power off. Short press to cycle through modes (Radio, SD/MMC, USB, AUX IN, BT).
- Volume/Select/Clock (11): Rotary knob for volume control. Press SEL to access sound effects (Volume, Bass, Treble, Balance, Fader, Loudness) and EQ presets (Pop, Rock, Class, Flat). Long press to adjust clock time.
- Radio Channel/Search/Storage (3): In radio mode, repeatedly press to change band (FM1-FM2-FM3). Long press to automatically search and store stations.
- Radio Memory Numbers (4): Buttons 1-6 for direct access to stored radio stations. Long press to save the current station.
- Radio Search Forward/Next Song/Answer Call (5): Short press to search forward in radio mode or skip to the next song in media playback. In BT mode, answers calls.
- Radio Search Backward/Previous Song/Ring Off (12): Short press to search backward in radio mode or go to the previous song in media playback. In BT mode, rings off calls.
- Play/Pause (5): In media playback, short press to pause/play.
- Scan (INT): Scans through tracks on SD/MMC/USB.
- Repeat (RPT): Repeats the current track.
- Random (RDM): Plays tracks in random order.
- -10/+10 (14, 15): Skips 10 songs backward/forward. Long press for last/next file.
- Reset (16): Button to restart the system in case of a crash.
Remote Control Operations:
The remote control duplicates most front panel functions and adds convenience for passengers. Key remote functions include:
- Power/Off (1): Turns the device on/off.
- Radio Memory/MP3 Select (2): Numeric buttons for direct selection of radio stations or MP3 tracks.
- Random Play (3): Long press for random play.
- EQ (4): Cycles through equalizer presets.
- Previous/Next Song (5, 16): Skips tracks.
- Volume Increase/Decrease (6, 14): Adjusts volume.
- Pause/Play (7): Controls playback.
- Mode (8): Changes input mode.
- Mute (9): Mutes audio.
- Scan (10): Scans tracks.
- Repeat (11): Repeats tracks.
- Last/Next Folder (12, 13): Navigates through folders on media.
- Band Switching/Auto-Search (15): Changes radio band or initiates auto-search.
- Clock (17): Displays time.
Bluetooth Operation:
- BT is on by default. Select BT mode using the MODE button.
- The BT symbol flashes when searching for a connection and becomes solid when connected.
- Play music from a mobile phone via BT.
- Short press the call button (5 on front panel, or on remote) to answer or ring off a call.
Maintenance Features
- Troubleshooting Guide: The manual provides a comprehensive troubleshooting table to address common issues such as:
- LCD not displaying: Check yellow wire connection to battery and red wire fuse.
- No sound: Verify power supply, speaker wire connections, and media format. Clean SD/MMC/USB golden finger if dirty.
- Low sound/unclear sound: Check internal power resistance and antenna connection.
- Mono track: Inspect speaker wire connections and amplifier IC.
- Reset Button (16): In case of system crash, the reset button allows for a quick restart.
- Fast Charge USB (17): This dedicated USB slot is for charging cell phones only, ensuring proper power delivery for mobile devices.
- Wiring Diagram: A detailed wiring diagram is provided for correct installation, showing connections for power, speakers (front/rear, left/right), antenna, and fuse. This aids in initial setup and diagnosing connection-related problems.
The device is designed for easy installation and user interaction, with clear indicators and intuitive controls for a pleasant in-car audio experience.
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