PRUNUS J-02S FM/AM/SW Radio User Manual

1. Introduction

The PRUNUS J-02S is a versatile portable radio designed for excellent reception across FM, AM, and Shortwave bands. It features multiple power options including a rechargeable battery, D batteries, and solar charging, along with modern connectivity like Bluetooth 6.0, TF card, USB drive, and AUX input for music playback. Its user-friendly design makes it suitable for all ages, offering a clear and immersive listening experience.

2. Safety Precautions

WARNING:

• Do not place the device near a fire source or expose it to high temperatures for a long time to prevent the battery from exploding.
• Keep away from children to prevent choking hazards caused by small parts.

General Precautions:

1. Fully charge the device before first use or after long-term storage.
2. Use only compatible 5V / 2A chargers and cables to avoid damage.
3. Do not disassemble the device yourself to avoid electronic malfunctions or damage.
4. Keep away from heat sources (especially vehicles during summer), water, moisture, or steam.
5. Do not use or store this device in places with excessively high temperatures or humidity.
6. Keep credit cards and SIM cards away from the speaker to prevent magnetic interference.
7. For better indoor reception, place the device near a window or an open area.
8. Locations such as reinforced concrete buildings (e.g., high-rises, tunnels), areas with strong electromagnetic interference (e.g., trams, mobile phones), remote or mountainous regions, or dense urban areas far from radio towers may cause weak signals or interference, leading to unclear reception.
9. If you hear thunder while using the radio outdoors, retract the antenna immediately and stop using it.
10. Avoid touching your eyes or sensitive areas when extending the antenna.
11. If the radio will not be used for an extended period, remove both the rechargeable battery and the D batteries (if installed) to prevent leakage or damage. It is also recommended to charge the rechargeable battery periodically to maintain optimal performance.
12. Handle with care and avoid dropping or subjecting it to strong impacts or vibrations.
13. Clean the device with a soft cloth; avoid oil, alcohol, and other corrosive liquids, which may cause discoloration or malfunctions.

3. Product Components

1. Telescopic Antenna
2. Frequency Scale
3. Band Selector: MUSIC / FM / AM / SW 1 / SW 2
4. Tuning Knob
5. Previous/Rewind Button
6. Play/Pause Button
7. Next/Fast-forward Button
8. Power/Volume Knob
9. Tone Control Knob
10. Speaker
11. DC 5V Charging Port (USB-C)
12. AUX-IN Jack
13. Charging Indicator
14. TF Card Slot
15. USB Drive Port
16. Power Indicator
17. Handle
18. Solar Panels
19. Battery Compartment

4. Specifications

5. Setup

5.1. Power Supply Options

The PRUNUS J-02S radio offers three flexible power options:

1. Built-in 3.7V 1800mAh Rechargeable Lithium Battery:

   This battery is pre-installed and is the primary power source. It can be charged via USB-C or solar panels.

   • Charging Instruction: Connect the USB-C charging cable to the DC 5V Charging Port (11) on the radio and the other end to a compatible 5V/2A power adapter.
   • Charging Time: Approximately 3-4 hours.
   • Charging Indicator (13): The indicator will light RED during charging and turn GREEN once fully charged.
   

   Notes on Charging:

   • Always use a charger with a DC 5V/2A output to protect the radio.
   • Avoid continuous charging for extended periods (e.g., over 24 hours) to maintain battery health.

2. 2 x D Batteries (not included):

   These can be used as an alternative power source. When the built-in lithium battery is depleted, the radio will automatically switch to D batteries.

   Installation Steps:

   1. Open the battery cover of the Battery Compartment (19).
   2. Insert 2 x D batteries, ensuring correct polarity as marked.
   3. Close the battery cover securely.
   

   Notes on D Batteries:

   • Change batteries if sound is distorted or volume is faint.
   • Do not mix new and old batteries.
   • Do not mix batteries with different power (mAh).
   • Do not mix different types or brands of batteries.
   • Do not mix alkaline and rechargeable batteries.

3. Solar Charging:

   The radio features two solar panels (18) on the top and back for emergency or backup power when sunlight is available.

   • Charging Instruction: Place the radio in direct sunlight, ensuring both Solar Panels (18) receive maximum sunlight.
   • Charging Indicator (13): The indicator will light RED, with brighter light indicating stronger sunlight and faster charging.
   • Tip: Solar charging is slow and not sufficient for a full charge; it's recommended for emergency or backup use only.
   

5.2. Antenna Setup

Extend the Telescopic Antenna (1) fully for optimal reception in FM and SW modes. For AM, reposition the radio itself to find the best signal.

6. Operating Instructions

6.1. Power ON/OFF

1. Power On: Rotate the Power/Volume Knob (8) clockwise until you hear a "click". The Power Indicator (16) will light up red.
2. Power Off: Rotate the Power/Volume Knob (8) counterclockwise until you hear a "click". The Power Indicator (16) will turn off.

6.2. Volume Adjustment

Rotate the Power/Volume Knob (8) clockwise to increase volume or counterclockwise to decrease volume.

6.3. Tone Adjustment

Use the Tone Control Knob (9) to adjust the audio output:

• Turn towards "LOW" (counterclockwise) for softer or deeper tones (bass).
• Turn towards "HIGH" (clockwise) for brighter or sharper tones (treble).

6.4. Radio Mode

1. Select the Band: Turn the Band Selector (3) to choose FM, AM, SW 1, or SW 2.
2. Tune a Station: Turn the Tuning Knob (4) to align the pointer on the Frequency Scale (2) with your desired frequency.
3. Fine-Tune for Clarity: Slowly adjust the Tuning Knob (4) until the sound is clear and free of static.

6.5. Music Mode (Bluetooth / TF Card / USB Drive / AUX)

Turn the Band Selector (3) to MUSIC mode to access various playback options.

Priority Order:

When multiple sources are connected, the radio prioritizes playback in this order: USB Drive > TF Card > AUX > Bluetooth. If no external source is connected, the radio defaults to Bluetooth mode.

1. Bluetooth Mode:
   • Ensure no TF card, USB drive, or AUX cable is connected. You will hear a prompt: “Bluetooth mode.”
   • Enable Bluetooth on your device (e.g., smartphone) and search for "J-02S" to connect. A prompt tone will confirm a successful connection.
   • Open your music app/software and start playback.
   • Use Previous/Rewind (5) or Next/Fast-forward (7) buttons to skip tracks.
   • Use Play/Pause (6) button to play or pause.
   • Notes: If connection is lost, the radio will emit a disconnection tone. It will automatically reconnect to the last paired device when Bluetooth is re-enabled or when switching back.
2. TF Card / USB Drive Playback:
   • Insert a TF card into the TF Card Slot (14) or a USB drive into the USB Drive Port (15). The radio will automatically switch to the corresponding mode with a prompt "Play by TF card” or “Play by USB drive” and start playback.
   • Use Previous/Rewind (5) or Next/Fast-forward (7) buttons to skip tracks.
   • Press and hold Previous/Rewind (5) or Next/Fast-forward (7) to fast forward or rewind (this feature is only available in TF card/USB drive playback).
   • Use Play/Pause (6) button to play or pause.
   • Notes: The radio can read MP3, WAV, APE, FLAC files. Max supported memory is 32GB. If the TF card or USB drive cannot be read, ensure it's formatted to FAT, FAT32, or exFAT (NTFS format is not supported).
3. AUX-in Playback:
   • Insert one end of an AUX cable (not included) into the AUX-IN Jack (12) and the other end into your phone or computer. The radio will automatically switch to AUX mode with a prompt: “AUX mode”.
   • Play music via your device's music app/software.
   • Use Play/Pause (6) button to mute or unmute the Speaker (10).
   • Note: In AUX mode, the Previous/Rewind and Next/Fast-forward buttons are disabled.

7. Getting Better Radio Reception

• Adjust the Telescopic Antenna (1) fully while listening to FM/SW.
• For AM reception, reposition the radio itself to find the best signal.
• Indoors, place the radio near a window or an open area and keep it away from electronic devices (computers, TVs, refrigerators, mobile phones) to minimize interference.
• Outdoors, listen in an open area.
• Human Body Induction: If reception is weak, holding the radio may improve the signal. The signal may weaken again when the hand is removed. This is a common phenomenon and not a defect.
• For superior shortwave reception, consider connecting a long wire via an alligator clip to either one of the telescopic antennas.

8. Maintenance

• Clean the device with a soft cloth.
• Avoid using oil, alcohol, and other corrosive liquids, which may cause discoloration or malfunctions.
• If the radio will not be used for an extended period, remove both the rechargeable battery and the D batteries (if installed) to prevent leakage or damage.
• Charge the rechargeable battery periodically to maintain optimal performance, even during long storage.

9. Troubleshooting

10. User Tips

• Enhanced Shortwave Reception: For better shortwave (SW) reception, try connecting a couple meters of wire via an alligator clip to either one of the telescopic antennas. This can significantly improve signal strength.
• Battery Flexibility: The option to use D batteries in addition to the rechargeable battery provides great flexibility for extended outdoor use or emergencies.
• Tone Control: Experiment with the tone control knob to find your preferred sound profile, especially when listening to music or different radio programs.
• Bluetooth Convenience: The Bluetooth 6.0 feature allows you to easily stream music from your phone, effectively turning the radio into a portable Bluetooth speaker.
• Portability: The compact size and handle make it ideal for use in various locations, from the kitchen to outdoor picnics.

11. Warranty and Support

For any issues with the product, assistance with its use, or other suggestions, please contact us:

Email: prunus-technik@hotmail.com

Manufacturer: Jin Ming Technology co.,Ltd.

Website: www.prunustech.com

Please refer to the official website or contact support for detailed warranty information.