Cherub WST-520C Auto Chromatic Tuner User Manual

1. Introduction

Thank you for choosing the Cherub WST-520C Auto Chromatic Tuner. This device is designed to provide accurate and reliable tuning for a wide range of musical instruments. Its compact size and intuitive operation make it an essential tool for musicians. Please read this manual carefully to ensure proper use and to maximize the performance of your tuner.

Figure 1: Cherub WST-520C Auto Chromatic Tuner. This image shows the silver-colored rectangular tuner with its display screen, two control buttons, a microphone, and an input jack. The brand "Cherub" and model "WST-520C" are clearly visible on the front casing.

2. Safety Information

• Do not expose the tuner to extreme temperatures, direct sunlight, or high humidity.
• Avoid dropping the device or subjecting it to strong impacts.
• Keep the tuner away from water and other liquids.
• When replacing batteries, ensure correct polarity and use only the specified battery type (AAA).
• Remove batteries if the device will not be used for an extended period to prevent leakage.

3. Package Contents

Please check that all items are present in the package:

• Cherub WST-520C Auto Chromatic Tuner
• 2 x AAA Batteries (included)
• User Manual (this document)

4. Product Overview

Components and Controls

Familiarize yourself with the various parts of your WST-520C tuner:

• Display Screen: Shows the note name, pitch deviation, and tuning status.
• MIC (Microphone): Built-in microphone for tuning acoustic instruments.
• KEY Button: Used to select the key for transposing instruments (C, F, Bb, Eb).
• ON---CALIB / OFF Button: Powers the unit on or off, and also adjusts the calibration (A4 frequency).
• INPUT Jack: 1/4-inch (6.35mm) input for connecting electric instruments.
• LED Indicators: Lights that indicate whether the note is flat, in tune, or sharp.

Figure 2: Detailed view of the Cherub WST-520C tuner's interface. This image highlights the LCD display, the "MIC" indicator, the "KEY" button for key selection, the "ON---CALIB / OFF" button for power and calibration, and the "INPUT" jack located on the side.

5. Setup

5.1 Battery Installation

1. Locate the battery compartment on the back of the tuner.
2. Slide open the battery compartment cover.
3. Insert two AAA batteries, ensuring the correct polarity (+ and -) as indicated inside the compartment.
4. Close the battery compartment cover securely.

5.2 Powering On/Off

• To turn ON the tuner, press and hold the ON---CALIB / OFF button for approximately 2 seconds.
• To turn OFF the tuner, press and hold the ON---CALIB / OFF button for approximately 2 seconds again.

6. Operating Instructions

6.1 Tuning an Instrument

The WST-520C tuner automatically detects the note being played. Follow these general steps:

1. Turn on the tuner.
2. Play a single note on your instrument.
3. Observe the display and LED indicators.
4. Adjust your instrument's tuning until the display shows the correct note and the indicators signal "in tune."

6.1.1 Using the Built-in Microphone (for Acoustic Instruments)

For acoustic instruments such as guitars, violins, or wind instruments, place the tuner close to the instrument's sound source. The tuner will pick up the sound through its internal microphone.

6.1.2 Using the Input Jack (for Electric Instruments)

For electric instruments like electric guitars or basses, connect a 1/4-inch instrument cable from your instrument's output to the INPUT jack on the tuner. This method provides direct signal detection and minimizes external noise interference.

6.2 Display Indicators

• Note Name: The large letter on the display indicates the detected note (e.g., C, D, E, F, G, A, B).
• Pitch Deviation Meter: The needle or bar on the display shows how far the pitch deviates from the target note.
• LED Indicators:
  • Left LED (Red): Indicates the note is flat.
  • Center LED (Green): Indicates the note is in tune.
  • Right LED (Red): Indicates the note is sharp.

6.3 Calibration (A4 Frequency Adjustment)

The standard A4 reference frequency is 440Hz. If you need to adjust this, follow these steps:

1. With the tuner ON, briefly press the ON---CALIB / OFF button (do not hold).
2. Each press will cycle the A4 calibration frequency, typically from 430Hz to 450Hz.
3. Stop at your desired A4 reference frequency. The tuner will automatically save the setting.

6.4 Key Selection (for Transposing Instruments)

For instruments that transpose, you can adjust the key setting:

1. With the tuner ON, briefly press the KEY button.
2. Each press will cycle through the available keys: C (Chromatic), F, Bb, Eb.
3. Select the appropriate key for your instrument. The tuner will display the selected key.

7. Maintenance

• Cleaning: Use a soft, dry cloth to clean the tuner's surface. Do not use abrasive cleaners or solvents.
• Storage: Store the tuner in a cool, dry place away from direct sunlight when not in use.
• Battery Replacement: Replace batteries when the display becomes dim or the tuner fails to power on. Always replace both batteries at the same time.

8. Troubleshooting

• Tuner does not power on:
  • Check if batteries are installed correctly with proper polarity.
  • Replace with fresh AAA batteries.
• Inaccurate tuning / Tuner not detecting notes:
  • Ensure the instrument is played clearly and loudly enough for the microphone to pick up, or that the cable connection is secure for electric instruments.
  • Minimize background noise.
  • Check the calibration setting (A4 frequency) and adjust if necessary.
• Display is dim:
  • Replace the batteries.

9. Specifications

10. Warranty Information

Cherub products are manufactured to high-quality standards. This product is covered by a limited warranty against defects in materials and workmanship. Please refer to the warranty card included with your purchase or visit the official Cherub website for detailed warranty terms and conditions.

11. Support

If you encounter any issues or have questions not covered in this manual, please contact Cherub customer support. You can find contact information on the official Cherub website or through your local distributor.