Introduction
The Yamaha YT150 is an auto tuner designed for both acoustic and electric guitars, as well as 4, 5, or 6-string bass guitars. It features a high-resolution LCD meter display for accurate tuning and LEDs for visibility in various lighting conditions. This manual provides instructions for the proper setup, operation, and maintenance of your YT150 tuner.

Figure 1: Yamaha YT150 Guitar/Bass Auto Tuner. This image shows the front view of the Yamaha YT150 tuner, displaying its LCD screen and control buttons.
Setup
1. Battery Installation
The YT150 tuner requires one CR2 battery (included). To install or replace the battery:
- Locate the battery compartment on the back of the unit.
- Open the battery compartment cover.
- Insert the CR2 battery, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
2. Connecting Your Instrument
The YT150 offers two methods for connecting your instrument:
- For Electric Guitars/Basses: Connect your instrument to the tuner's INPUT jack using a standard 1/4-inch instrument cable. If you wish to pass the signal through to an amplifier, connect the tuner's OUTPUT jack to your amplifier's input.
- For Acoustic Guitars: Utilize the built-in microphone. Ensure the tuner is placed near the soundhole of your acoustic instrument for optimal sound detection.
Operating Instructions
1. Powering On/Off
Locate the power switch, typically a slide switch, on the side or back of the unit. Slide it to the "ON" position to power on the tuner. Slide it to the "OFF" position when not in use to conserve battery life.
2. Selecting Tuning Mode
The YT150 features an auto mode and a dedicated bass mode:
- Auto Mode: This mode automatically detects the closest tone programmed in the tuner, providing fast and efficient tuning for both guitars and basses.
- Bass Mode: For bass guitars, select the "bass mode" to display bass string notes in their proper order, optimizing the tuning experience for bass instruments.
3. Tuning Your Instrument
- Pluck a single string on your instrument.
- Observe the LCD display. The display will show the detected note.
- Adjust your instrument's tuning peg until the display indicates the correct note and the "in-tune" LED illuminates. The sharp/flat LEDs will guide you if the note is too high or too low.
- Repeat for all strings.
The large, easy-to-read liquid crystal display presents notes clearly, making tuning straightforward even from a distance or in low light conditions.
Maintenance
1. Cleaning
Wipe the tuner with a soft, dry cloth. Do not use abrasive cleaners or solvents, as these can damage the finish and internal components.
2. Storage
When not in use for extended periods, remove the battery to prevent leakage and store the tuner in a cool, dry place away from direct sunlight and extreme temperatures.
3. Battery Replacement
If the display becomes dim or the tuner behaves erratically, it may be time to replace the battery. Refer to the "Battery Installation" section under Setup for instructions.
Troubleshooting
- Tuner does not power on:
- Ensure the power switch is in the "ON" position.
- Check the battery. Replace it if it is depleted or incorrectly installed.
- Inaccurate tuning:
- Ensure the instrument is properly connected (via cable for electric, or microphone for acoustic).
- For acoustic instruments, ensure the tuner's microphone is close to the sound source and there is minimal background noise.
- Pluck strings firmly and clearly, one at a time.
- Check if the correct mode (Auto or Bass) is selected for your instrument.
- Display is dim or flickering:
- The battery may be low. Replace the battery.
Specifications
| Feature | Detail |
|---|---|
| Model Number | YT150 |
| Tuning Range | Guitar, Bass (4, 5, or 6 string) |
| Input/Output | 1/4-inch jack (Input, Output) |
| Microphone | Built-in for acoustic instruments |
| Display | High-resolution LCD with sharp/flat/in-tune LEDs |
| Power Supply | 1 x CR2 battery (included) |
| Item Weight | 0.352 ounces (approximately 10 grams) |
| Product Dimensions | 4 x 8.5 x 9 inches (approximately 10.16 x 21.59 x 22.86 cm) |
Warranty and Support
For warranty information and customer support, please refer to the documentation included with your purchase or visit the official Yamaha website. Keep your proof of purchase for any warranty claims.
Online Support: www.yamaha.com