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Harley Benton CPT-20 Floor Pedal Tuner User Guide
Quick start guide for the Harley Benton CPT-20 floor pedal tuner, covering setup, operation, technical specifications, and safety instructions.
Table of contents
Quick guide from the manual
The Harley Benton CPT-20 is a chromatic floor tuner designed for musical instruments. This document provides essential instructions for safe operation, connection, and usage. Always ensure the device is used indoors within the specified ambient conditions to prevent damage.
Connections and controls
The device features a 6.35 mm jack input and output, a 9V DC power supply socket, and a bypass switch. The LED/LCD display provides clear tuning feedback, with specific indicators for flat notes, sharp notes, and correct tuning.
Operation
- Connect your instrument cable to the INPUT jack.
- Connect an optional power supply to the DC 9V socket. The device will start in bypass mode.
- Press the BYPASS switch to activate the tuning function.
- Connect the rest of your signal chain to the OUTPUT jack.
Safety and handling
- Electrical safety: Do not remove covers; there are no user-serviceable parts inside.
- Environment: Operate only indoors. Avoid direct sunlight, heavy pollution, strong vibrations, and extreme temperature fluctuations.
- Cleaning: Use only a clean, dry cloth. Never use liquid cleaners, benzene, or thinners.
- Liquids: Keep the device away from containers with liquid to prevent short circuits or fire.
Technical specifications
- Frequency range: A (27.5 Hz) to C (4,168 Hz)
- Accuracy: ±1 cent
- Power supply: 9V DC, min. 33 mA, centre negative
- Dimensions: 46 mm x 49 mm x 95 mm
- Weight: 112 g
- Ambient conditions: 0 °C to 40 °C, 20% to 80% relative humidity (non-condensing)
Practical help
Common problems
Device does not turn on or function
Ensure the power supply is connected correctly to the 9V DC socket and meets the 9V/33mA centre negative requirement.
Device damaged by temperature fluctuations
If the device was transported in low temperatures, do not switch it on immediately; allow it to reach room temperature first.
Signal issues or noise
Ensure no liquid has entered the device and that no metallic parts have fallen inside. Check that the input/output cables are securely connected.
Before use
- Verify the power supply is 9V DC, centre negative, and provides at least 33 mA.
- Ensure the environment is dry and free from heavy dust or smoke.
- Check that the device covers are intact and not damaged.
- Confirm the instrument cable is 6.35 mm jack compatible.
Specs in practice
- Centre negative
- The polarity of the power plug; the inner pin must be negative, and the outer sleeve must be positive.
- ±1 cent accuracy
- The precision level of the tuner; 1 cent is 1/100th of a semitone.
Model compatibility
- Designed for use with musical instruments.
- Requires an external power adapter (100-240V, 50/60Hz) with 9V DC output.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.