Introduction
This manual provides detailed instructions for the safe and efficient operation of your PRUNUS J03C Portable AM/FM Radio. Please read this manual thoroughly before using the device and retain it for future reference.
Safety Information
- Do not expose the radio to rain, moisture, or extreme temperatures.
- Avoid disassembling the unit. Refer all servicing to qualified personnel.
- Use only specified power sources (USB-C 5V DC or AA batteries).
- Keep the radio away from strong magnetic fields.
- Dispose of batteries according to local regulations.
Package Contents
- PRUNUS J03C Portable AM/FM Radio
- USB-C Charging Cable
- Owner's Manual
Note: AA batteries are not included.
Product Overview
Familiarize yourself with the radio's components and controls.
Figure 1: Front view of the PRUNUS J03C radio, highlighting its compact size (8.2 x 5.2 x 2.4 inches) and foldable handle for portability.
Figure 2: Detailed view of the radio's control panel, showing the large Tuning Knob, Frequency Display, and Volume Knob for easy adjustment.
Key Components:
- Tuning Knob: Used to select radio frequencies.
- Volume Knob: Adjusts the audio output level.
- Frequency Display: Shows the current radio frequency.
- AM/FM Switch: Selects between AM and FM radio bands.
- Telescopic Antenna: Extends for improved FM reception.
- USB-C Charging Port: For charging the internal battery.
- AA Battery Compartment: For backup power.
- 3.5mm Headphone Jack: For private listening.
Setup
Powering the Radio:
The PRUNUS J03C radio offers two power options: an internal rechargeable battery via USB-C or 4 AA batteries (not included).
Figure 3: Illustration of the two power options: USB-C charging and the compartment for 4 AA batteries.
- USB-C Charging: Connect the provided USB-C cable to the radio's DC 5V port and the other end to a USB power adapter (not included) or a computer USB port. The power indicator light will illuminate during charging. A full charge provides approximately 9 hours of continuous use.
- AA Battery Installation: Open the battery compartment cover on the back of the radio. Insert 4 new AA batteries, ensuring correct polarity (+/-). Close the cover securely.
When both rechargeable and AA batteries are present, the radio prioritizes the rechargeable battery. Once depleted, it automatically switches to AA batteries.
Operating Instructions
- Power On/Off: Rotate the Volume Knob clockwise to turn the radio on. Continue rotating to increase volume. Rotate counter-clockwise until it clicks to turn off.
- Select Band: Use the AM/FM switch to select your desired radio band.
- Tune to a Station: Slowly rotate the Tuning Knob to scan for stations. The frequency display will show the current frequency.
- Adjust Volume: Use the Volume Knob to set the desired listening level.
- Headphone Use: For private listening, plug 3.5mm headphones (not included) into the headphone jack. The speaker will automatically mute.
Tuning and Reception
To achieve optimal reception:
- FM Reception: Extend the telescopic antenna fully and adjust its angle and direction for the clearest signal.
- AM Reception: The radio has a built-in ferrite bar antenna for AM. Rotate the entire radio for the best reception. The telescopic antenna is not used for AM.
- Avoid placing the radio near electronic devices that may cause interference.
Figure 4: Demonstrates the radio in an outdoor setting with its telescopic antenna extended for enhanced FM reception.
Audio Output
The PRUNUS J03C features a large, powerful speaker for clear sound and a 3.5mm headphone jack for personal listening.
Figure 5: Exploded view illustrating the large speaker and the location of the 3.5mm headphone jack for versatile audio output.
Maintenance
- Clean the radio with a soft, dry cloth. Do not use liquid cleaners or abrasive materials.
- If not using the radio for an extended period, remove the AA batteries to prevent leakage.
- Store the radio in a cool, dry place.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Internal battery depleted; AA batteries dead or incorrectly inserted. | Charge the radio via USB-C. Check AA battery polarity and replace if necessary. |
| Poor reception / Static | Weak signal; antenna not extended/positioned correctly; interference. | For FM, extend and adjust the telescopic antenna. For AM, rotate the radio. Move away from other electronic devices. |
| No sound from speaker | Volume too low; headphones plugged in. | Increase volume. Unplug headphones if not desired. |
Specifications
| Model Number | J-03C |
| Brand | PRUNUS |
| Radio Bands Supported | FM (87-108 MHz), AM (520-1710 KHz) |
| Power Source | Internal Lithium Polymer battery (rechargeable via USB-C), 4 x AA batteries (not included) |
| Voltage | 5 Volts (DC) |
| Speaker Maximum Output Power | 5 Watts |
| Connectivity Technology | AM FM |
| Hardware Interface | 3.5mm Audio Jack |
| Product Dimensions | 22.9L x 7.8W x 8H Centimetres (approx. 8.2 x 5.2 x 2.4 inches) |
| Item Weight | 499 g (approx. 1.1 lb) |
| Included Components | Owner's Manual |
Warranty
The PRUNUS J03C Portable AM/FM Radio comes with a one-year warranty from the date of purchase. This warranty covers manufacturing defects. Please retain your proof of purchase for warranty claims. The warranty does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear.
Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact PRUNUS customer support. Refer to the contact information provided with your purchase or visit the official PRUNUS website.