1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your kebidu Bluetooth 5.0 MP3/MP5 Decoder Board. This versatile module is designed for DIY audio and video projects, car audio systems, and other applications requiring media playback and Bluetooth connectivity. Please read this manual carefully before use to ensure proper functionality and safety.
2. Product Variants
This product is available in two main variants, each with distinct features:
2.1 MP5 Decoder Board (with 2.8-inch TFT screen)
This version offers advanced video playback capabilities, a color screen, and a comprehensive set of features for both audio and video. It is identified by its 2.8-inch TFT display and typically comes with a remote control.
2.2 MP3 Decoder Board (Model JQ-D136BT, with LED digital display)
This version focuses on audio playback with an LED digital display, built-in amplifier, and microphone input for karaoke or hands-free calls. It is identified by its digital LED display and typically comes with a remote control and wiring harnesses.
3. Safety Precautions
- Ensure the power supply voltage is within the specified range for your model (DC 6V-24V for MP5, DC 7V-16V for MP3).
- Connect wiring correctly. The device features reverse power protection, but incorrect wiring can still cause damage to connected components.
- Avoid exposing the device to moisture, extreme temperatures, or direct sunlight.
- Do not attempt to disassemble or modify the device, as this will void the warranty and may cause damage.
- Keep out of reach of children.
4. Setup and Installation
4.1 Power Supply Connection
Both decoder boards require an external DC power supply. Ensure the power supply meets the voltage and current requirements for your specific model.
- MP5 Decoder Board: DC 6V-24V.
- MP3 Decoder Board (JQ-D136BT): DC 7V-16V, with a recommended current of 2A or more.
Connect the positive (+) and negative (-) terminals of your power supply to the corresponding VCC and GND inputs on the decoder board. The device has reverse power protection to prevent damage if connected incorrectly, but always double-check your connections.
4.2 MP5 Decoder Board Wiring Diagram
Refer to Figure 3 for the MP5 Decoder Board wiring. Key connections include:
- 5-24V / GND: DC Power Input.
- CVBS_OUT: Composite Video Output (for connecting to a display).
- AGND: Audio Ground.
- L-OUT / R-OUT: Stereo Audio Left and Right Outputs.
- FM_ANT: FM Antenna connection (if applicable).
4.3 MP3 Decoder Board (JQ-D136BT) Wiring Diagram
Refer to Figure 4 for the MP3 Decoder Board (JQ-D136BT) wiring. Key connections include:
- GND(+) / (-)VCC: DC Power Input.
- L(+)L(-) / R(+)R(-): Speaker Outputs (for connecting two 25W speakers).
- USB Port: For USB flash drives.
- TF Slot: For TF/Micro SD cards.
- MIC: 6.5mm Microphone input.
- IR: Infrared receiver for remote control.
4.4 Media Storage Connection
- USB: Insert a USB flash drive into the USB port. For MP5, large mobile hard disks are supported but require a current of 1.5A or more.
- TF/SD Card: Insert a TF (Micro SD) card into the designated slot.
5. Operation
5.1 Basic Controls (Common to both models, button layout may vary)
- Power Button: Turns the device on/off.
- Play/Pause: Starts or pauses playback.
- NEXT/VOL+: Short press for next track/station, long press for volume up.
- PREV/VOL-: Short press for previous track/station, long press for volume down.
- MODE: Switches between input modes (Bluetooth, USB, TF, FM, AUX).
- REPEAT (MP3): Repeats current track or playlist.
- EQ (MP3): Cycles through equalizer presets.
5.2 Bluetooth Pairing
- Switch the decoder board to Bluetooth mode using the MODE button.
- On your mobile device, search for Bluetooth devices. The device name will typically be "kebidu BT5.0" or similar.
- Select the device to pair. Once paired, you can stream audio and use hands-free calling.
5.3 Media Playback
- Insert your USB drive or TF card. The device should automatically switch to the corresponding mode and begin playback. If not, use the MODE button.
- MP5 Decoder Board: Supports video (up to 1280*1080 HD), audio, image, and e-book formats. Use the on-screen menu for navigation.
- MP3 Decoder Board: Supports MP3/WMA/WAV/APE/FLAC audio formats. Features folder switching.
5.4 FM Radio (MP3 Decoder Board)
- Switch to FM mode.
- Use the PREV/NEXT buttons to scan for stations.
- The FM frequency range is 87.5-107.5MHz.
5.5 Clock and Alarm Functions (MP5 Decoder Board)
- Access the "Time" or "Settings" menu on the MP5 screen to set the calendar clock.
- The alarm clock function supports up to 3 settings with optional ringtones or default music playback.
- Timing switch allows for music playback upon boot-up.
5.6 Remote Control
Both models come with an infrared remote control for convenient operation. Point the remote towards the IR receiver on the board.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use liquid cleaners or solvents.
- Software Upgrade: The device supports smart software upgrades. Refer to the manufacturer's website or contact support for instructions on how to perform updates.
- Storage: When not in use for extended periods, store the device in a cool, dry place away from direct sunlight.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Incorrect power connection; insufficient power supply; faulty power supply. | Check power supply voltage and current. Ensure positive and negative terminals are correctly connected. Try a different power supply. |
| No audio output or low volume. | Incorrect audio wiring; volume too low; incompatible speaker impedance (MP3); faulty speakers/amplifier. | Verify audio output connections (L/R OUT). Increase volume. For MP3, ensure speakers are 25W compatible. Check external amplifier if used. |
| No video output (MP5). | Incorrect CVBS connection; display not set to correct input; unsupported video format. | Check CVBS_OUT connection to your display. Ensure display is on the correct input channel. Verify video file format is supported. |
| Bluetooth not connecting. | Device not in Bluetooth mode; too far from source; interference. | Switch to Bluetooth mode. Ensure device is discoverable. Move closer to the source device. Reduce interference. |
| USB/TF card not recognized. | Incorrectly inserted; unsupported file system (e.g., not FAT32); corrupted media. | Reinsert media. Ensure media is formatted to FAT32. Try a different USB/TF card. For MP5, ensure large hard disks meet current requirements (>1.5A). |
8. Specifications
8.1 General Specifications (Common)
- Brand: kebidu
- Bluetooth Version: 5.0 (supports audio transmission and hands-free calling)
- Supported Languages: Chinese, English
- Operating Mode: Touch Tone (buttons) / Remote Control
- Body Material: Plastic
- Origin: China
8.2 MP5 Decoder Board Specifics
- Model Number: Bluetooth MP5 Decoder Board Video Player
- Display: 2.8-inch 320*240 TFT screen
- Power Supply: DC 6V-24V
- Video Decoding: Up to 1280*1080 HD resolution
- Supported Video Formats: MKV (MPEG2/RMVB/WMV9/XVID/H.264), AVI (XVID/H.264), MP4/M4V (XVID/H.264), MOV (XVID/H.264), VOB (MPEG2), PMP (XVID/H.264), RM/RMVB (RV8/9), MPG (MPEG1/MPEG2), FLV (H.263/H.264), 3GP, DIVX, DAT, etc.
- Supported Audio Formats: MP3, WMA, OGG, FLAC, AAC, APE
- Supported Image Formats: JPEG, BMP, GIF, PNG
- Supported E-book Formats: TXT, LRC, .C
- Interfaces: USB, SD Card, AUX Input, CVBS Video Output, Stereo Audio Output (R/L)
- Features: Dynamic setting function, digital album playback, built-in 16*16 DDR, calendar clock, alarm clock (up to 3 settings), timing switch.
- Dimensions (WxHxD): Approximately 120*70MM
8.3 MP3 Decoder Board (JQ-D136BT) Specifics
- Model Number: JQ-D136BT
- Display: LED Digital Tube Display
- Power Supply: DC 7V-16V (recommended current ≥ 2A)
- Amplifier: 2*25W (can connect two 25W speakers simultaneously)
- Supported Audio Formats: MP3/WMA/WAV/APE/FLAC lossless music format
- FM Radio: 87.5-107.5MHz
- Interfaces: USB, TF Card, LINE IN, MIC (6.5mm), DC 12V input
- Features: Microphone function, folder switching, built-in speaker option, FM support.
- Dimensions: Panel size: 75*50 MM, Panel depth: 40mm
9. User Tips
- Power Supply: While the MP5 board supports up to 24V, 12V is a common and suitable power source for both models, especially in car applications.
- Audio Quality: If experiencing low sound output, double-check all audio connections and ensure your external amplifier (if used) is properly configured and powered.
- Large Storage: When using large mobile hard disks with the MP5 board, ensure your power supply can provide at least 1.5A of current to prevent playback issues.
- Shuffle Mode: Although not explicitly listed, many media players include a shuffle or random playback mode. Check the device's menu or remote control for this option.
10. Warranty and Support
For technical support, warranty claims, or further assistance, please contact your seller or the manufacturer directly. Keep your purchase receipt as proof of purchase.
