1. Introduction
Thank you for purchasing the Sansui F50/F51 HD Screen Video Radio Bluetooth Speakers. This multifunctional device combines a portable radio with a multimedia player, offering a wide range of entertainment options. To ensure optimal performance and longevity of your product, please read this manual carefully and keep it for future reference.
2. Product Overview
The Sansui F50/F51 is a versatile device designed for portable entertainment. It features an HD screen for video and image playback, Bluetooth connectivity for wireless audio, and a multi-band radio tuner. The F50 model has a 4.3-inch screen, while the F51 model boasts a larger 7.0-inch screen.
Figure 1: Sansui F50/F51 Product Diagram
- Video Button: Short press to switch to Video mode; during Video mode, short press to power on/off LCD display.
- Menu Button: During Video mode, short press to view file information, edit, and select play mode.
- Return Button: Short press to return from the current page to the previous page.
- BT Button: Short press to enter Bluetooth mode.
- Play/Pause Button (►II): When playing music, short press to play and pause.
- Next Track Button (►►): During Video and music playing modes, short press for the next track. Long press for fast forward, short press again to exit fast forward. In Radio mode, short press for the next radio station.
- Previous Track Button (◄◄): During Video and music playing modes, short press for the previous track. Long press to rewind, then short press again to exit rewind. In Radio mode, short press for the previous radio station.
- SW Button: Short press to enter SW band; long press to start automatic SW station search.
- FM Button: Short press to enter FM band; long press to start automatic FM station search.
- MW Button: Short press to enter MW band; long press to start automatic MW station search.
- Power ON/OFF Switch: Controls the main power of the unit.
- Earphone Jack: For connecting headphones (3.5mm wired headphones).
- DC 5V Charging Port: Type-C port for charging.
- USB Port: For reading USB flash drives, playing music, video, e-books, images, and other files.
- 1-0 Number Keys: Select tracks or radio stations using single or combined numbers.
- Tuning Button: Search and select radio stations for FM/SW/MW.
- Volume Button: Adjusts the audio volume.
- TF (Micro SD) Slot: For reading TF cards, playing music, audio, e-books, images, and other files.
3. Setup
3.1. Charging the Device
Connect the small plug of the supplied USB charging cable into the DC 5V (TYPE C) Port on the unit. Connect the full-size USB plug to a USB power source such as a USB charger, PC/MAC, etc. The battery icon on the LED display screen will blink during charging and remain solid when charging is complete.
3.2. Battery Installation
This model uses three 18650 lithium batteries (included). When installing the batteries, pay close attention to the correct polarity (direction) of each battery. It is recommended to use the same type and model of batteries for replacement to ensure optimal performance and lifespan of the radio. If the unit will not be used for a long time, please remove the batteries and store them properly.
Figure 2: Detachable Lithium Battery Installation (3 x 1200mAh)
4. Operation
4.1. Power On/Off
Push the Power ON/OFF switch to the ON position to power on the unit. To turn off, push the switch to the OFF position.
4.2. Bluetooth Connection
With the unit powered on, short press the BT Button to enter Bluetooth mode. The "BLUE" indicator will blink on the LED display screen. On your mobile phone or other external Bluetooth device, search for "SANSUI" and select it to pair. Once connected, the "BLUE" indicator will stop blinking.
Video 1: Demonstration of Bluetooth pairing and interface navigation.
Figure 3: Bluetooth Pairing Screen
4.3. FM/SW/MW Radio Operation
Power on the unit and press the FM, SW, or MW Button to enter the respective radio mode. Turn the Tuning Button or use the Number Keys (1-0) to select different stations. For automatic station search, long press the FM, SW, or MW Button for a few seconds. The unit will automatically search and store all available stations, then play the first stored station.
Figure 4: Radio Interface
The device features a 360-degree rotating 53cm antenna for high-sensitivity radio reception across FM, MW, and SW bands. FM radio also supports campus broadcasting.
4.4. Video Playback
Short press the Video Button to enter Video mode. Insert a USB flash drive or TF (Micro SD) card containing video files into the respective port/slot. Use the ◄◄ or ►► Button to select the "VIDEO" icon on the screen. Short press the Play/Pause Button (►II) to start playing videos. During video playback, long press ◄◄ or ►► Button to fast forward or rewind. Short press ◄◄ or ►► Button again to exit fast forward/rewind. The device supports full-format 720P high-definition video playback (RM, H264, Xvid, Mpeg2) and up to 1080P video playback (H.264HP high bit rate decoding: RM, AVI, MKV, VOB, MOV, FLV, ASF, DAT, MP4, 3GP, MPG, MPEG, etc.).
Figure 5: F51 Model with 7-inch HD Screen for Video Playback
Figure 6: Video Playback Interface
4.5. Music Playback
Short press the Video Button to enter Video mode and power on the LCD display screen. Insert a USB flash drive or TF (Micro SD) card containing music files. Use the ◄◄ or ►► Button to select the "MUSIC" icon on the screen. Short press the Play/Pause Button (►II) to start playing music. During music playback, long press ◄◄ or ►► Button to fast forward or rewind. Short press ◄◄ or ►► Button again to exit fast forward/rewind. The device supports MP3, WAV, OGG, APE, FLAC and other full-format audio. It also supports lyrics display, provided an "LRC" lyrics file is downloaded alongside the audio file.
Figure 7: Music Playback Interface
4.6. E-book Display
Short press the Video Button to enter Video mode and power on the LCD display screen. Insert a USB flash drive or TF (Micro SD) card containing e-books in TXT format. Use the ◄◄ or ►► Button to select the "E-BOOKS" icon on the screen. Short press the Play/Pause Button (►II) to start displaying e-books. Use the ◄◄ or ►► Button for page turning. Short press the Play/Pause Button (►II) again to enter automatic flipping reading. Short press the Menu Button to set up automatic reading interval, quickly turn pages, switch fonts, and backgrounds.
Figure 8: E-book Display Interface
4.7. Image Display
Short press the Video Button to enter Video mode and power on the LCD display screen. Insert a USB flash drive or TF (Micro SD) card containing image files (JPG, JPEG, BMP, GIF, PNG, etc.). Use the ◄◄ or ►► Button to select the "IMAGES" icon on the screen. Short press the Play/Pause Button (►II) to start displaying images. Use the ◄◄ or ►► Button for image turning. Short press the Play/Pause Button (►II) again to enter automatic image turning (PPT mode). Short press the Menu Button to set up the PPT playing interval, image zooming, and view image information.
Figure 9: Image Display Interface
5. Specifications
| Feature | Specification |
|---|---|
| Brand Name | MouZYuan (Sansui) |
| Model | F50 / F51 |
| Screen Size (F50) | 4.3-inch HD LED |
| Screen Size (F51) | 7.0-inch IPS HD LED |
| Rated Power | 5W |
| Frequency Response | 100 Hz - 18 kHz |
| Bluetooth Version | 5.0 |
| Maximum Wireless Range | <10m |
| Battery Type | 3 x 18650 Lithium battery (1200mAh each) |
| Battery Life | >8 hours (approx. 8-10 hours) |
| Input Power Supply | DC 5V/1A (USB Type-C) |
| Speaker Driver (F50) | 2.5" Dual magnetic horn |
| Speaker Driver (F51) | 3" Internal magnetic speaker |
| Dimensions (F50/F51) | 162.6mm x 33.5mm x 88.9mm (F50) / 223mm x 34.5mm x 124.5mm (F51) |
| Radio Bands | FM (87.5-108MHz), MW (522-1620KHz), SW (2.3-22Mhz) |
| Audio Crossover | Full-Range |
| Playback Function | Radio, MP3, Video, E-book, Image |
| Video Format Support | H.264HP (RM, AVI, MKV, VOB, MOV, FLV, ASF, DAT, MP4, 3GP, MPG, MPEG, etc.) up to 1080P |
| Audio Format Support | MP3, WAV, OGG, APE, FLAC (with LRC lyrics support) |
| Image Format Support | JPG, JPEG, BMP, GIF, PNG |
| E-book Format Support | TXT, ANSI |
| Control Type | Playback, Volume control, Number keys |
| Certification | CE |
6. Troubleshooting Guide
If you encounter any issues with your Sansui F50/F51, please refer to the table below for common problems and their solutions.
| Symptom | Possible Cause | Possible Solution |
|---|---|---|
| No power | Main Power Switch is not in ON position | Switch the power switch on the right of unit to POWER ON position. |
| No power | Battery drained | Recharge the battery, power on later. |
| No sound | Volume level in the minimum position | Increase volume level by turning the VOLUME button. |
| No sound | Earphones plugged in | Unplug earphones. |
| Audio/Video file was damaged | Corrupted file | Switch tracks or download the music/video again. |
| Radio reception poor | The radio antenna is not deployed | Pull the radio antenna apart and adjust it to the optimal position. |
| Radio reception poor | Radio frequency deviation | Adjust the frequency to match the radio frequency. |
| Radio reception poor | There are interference devices around this unit | Move the unit away from interference sources, preferably at the window for easy signal reception. |
| Radio reception poor | The unit is on its side in MW radio mode | Properly place the unit, keeping the unit parallel to the horizon. |
| Video file cannot be played, splash screen or automatic jump during playback | The file format is too large and incompatible | Suggest using a format conversion tool to convert video files to 720P. Note that this unit supports H.264 1080P (30Hz). |
| Video file cannot be played, splash screen or automatic jump during playback | The storage device or stored video file is damaged | Reformat storage devices; suggest using FAT32 or EXFAT format to download the video file again. |
| Unit is not charging or light does not light on when charging | The battery is not installed properly | Re-install the battery correctly. |
| Unit is not charging or light does not light on when charging | The light does not light on when charging | Re-plug and unplug the charging cable, or replace the phone charger and charging cable for testing. |
7. Important Safeguards
Please observe the following safety precautions to prevent damage to the device or injury to yourself:
- Do not allow water to spill onto the surface or into the product.
- This unit is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities or lack of experience and knowledge unless they are supervised or given instruction concerning the use of the appliance by a person responsible for their safety.
- Children should be supervised to ensure they do not play with the unit.
- If the product surface is damaged or if there is a mechanical or electrical malfunction, do not use the unit. Contact the authorized service center immediately.
- Do not shake the unit.
- Do not place the unit in water.
- Do not place the product in direct heat. This unit is to be placed in a dry and ventilated place.
- Do not place heavy objects on the unit.
- If the battery is completely flat, connect the USB charging cable to charge the unit. Please note the unit may not work properly for the first couple of minutes of charging.
8. User Tips
- For optimal video experience, ensure your video files are converted to 720P resolution.
- When using the radio, fully extend the antenna and position the device near a window for better signal reception.
- To enjoy lyrics with your music, ensure you download the corresponding "LRC" file along with your audio track.
- The F51 model offers a larger 7-inch screen, which is ideal for video playback and e-book reading.
- Remember to check battery polarity carefully during installation to avoid damage.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the seller's contact information or the official Sansui website. Keep your purchase receipt as proof of purchase.