Denon PMA 770 Service Manual

The Denon PMA 770 is a high-performance integrated amplifier designed for audiophiles. It features advanced circuitry, high-quality components, and a robust power supply to deliver exceptional sound quality. The amplifier supports various input sources, including phono, CD, and auxiliary, and includes tone control adjustments for a personalized listening experience. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Operating the Amplifier 8. Maintenance & Care 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Integrated amplifier, multiple input options, tone control, headphone output, and remote control.

Feature	Description
Phono Input	For connecting turntables with MM cartridges
CD Input	Dedicated input for CD players
Auxiliary Input	For connecting external audio devices
Headphone Output	For private listening
Tone Control	Adjust bass and treble levels
Remote Control	Convenient operation from a distance
Power Output	70W per channel at 8 ohms
Speaker A/B	Ability to connect two sets of speakers

Installation

Unpack and inspect contents. Place the amplifier on a stable surface.

Connect speakers: Use speaker wire to connect to the A/B terminals.
Connect audio sources: Use RCA cables for CD and auxiliary inputs.
Plug into AC power.

WARNING! Ensure all connections are secure to avoid damage.

First-Time Setup

Power on the amplifier; select the desired input source.

Adjust volume: Use the volume knob to set a comfortable listening level.
Set tone controls: Adjust bass and treble to your preference.
For phono: Ensure the turntable is properly connected and set to MM mode.

CAUTION! Avoid high volume levels during initial setup.

Specifications

Power Output: 70W per channel (8 ohms).
Frequency Response: 5 Hz - 100 kHz.
Input Sensitivity: Phono: 2.5 mV, CD: 200 mV.
Signal-to-Noise Ratio: 100 dB (A-weighted).
Dimensions: 434 x 151 x 360 mm.
Weight: 8.5 kg.
Power Supply: AC 120V, 60Hz.

Controls and Settings

Access controls via the front panel or remote. Key controls include power, volume, input selection, and tone adjustments.

Remote: Power, volume, input selection, and mute.

Adjustments: Bass, treble, and balance settings available through the front panel.

Connecting Devices

Connect speakers and audio sources using appropriate cables.

Turn off the amplifier before making connections.
Match cables to ports (e.g., RCA to CD input).
Select input via the front panel or remote control.

Tip: Ensure all devices are powered off during connection.

Operating the Amplifier

Use the remote or front panel to control playback and adjust settings.

Power on the amplifier.
Select the desired input source.
Adjust volume and tone settings as needed.

WARNING! Avoid sudden volume changes to prevent speaker damage.

Maintenance & Care

Unplug the amplifier before cleaning. Use a soft, dry cloth to clean the exterior.

CAUTION! Do not use liquids or aerosols; keep away from heat sources.

Regulatory Information

This device complies with FCC Part 15 regulations. For support, visit www.denon.com or contact customer service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Incorrect input/source	Check input selection and connections.
Distorted sound	Overdriven volume	Reduce volume and check speaker connections.
Remote not working	Batteries	Replace batteries in the remote control.
Amplifier overheating	Blocked ventilation	Ensure proper airflow around the amplifier.

Reset: Unplug the amplifier for 10 seconds to reset.

Service: Contact Denon support for further assistance.