Denon PMA 920 Service Manual

The Denon PMA 920 is a high-performance integrated amplifier designed to deliver exceptional audio quality. It features advanced circuitry, high-current output transistors, and a robust power supply to ensure optimal performance. 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 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Integrated amplifier, multiple input options, tone control, remote control, and high-quality audio output.

Feature	Description
Multiple Inputs	Supports various audio sources including CD, phono, and auxiliary inputs.
High-Current Output	Delivers powerful audio performance with low distortion.
Tone Control	Adjust bass and treble settings for personalized sound.
Remote Control	Convenient operation from a distance.
Headphone Jack	For private listening.
Speaker A/B Switching	Connect multiple speaker sets easily.

Installation

Unpack and inspect contents. Place on a stable surface.

Connect audio sources: Use RCA cables for CD, phono, and auxiliary inputs.
Connect speakers: Use speaker wire to connect to the A/B speaker terminals.
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 the desired listening level.
Set tone controls: Adjust bass and treble to your preference.
For phono input: Ensure the turntable is properly connected and grounded.

CAUTION! Ensure stable surface; avoid placing heavy objects on top.

Specifications

Power Output: 70W per channel (8 ohms).
Frequency Response: 5 Hz to 100 kHz.
Total Harmonic Distortion: < 0.1%.
Input Sensitivity: 2.5 mV (phono), 200 mV (line).
Signal-to-Noise Ratio: 100 dB (line).
Dimensions: 434 x 151 x 360 mm.
Weight: 8.5 kg.

Controls and Settings

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

Remote: Volume, input selection, mute, and tone controls.

Connecting Devices

Connect audio sources using RCA cables. Ensure all devices are powered off before connecting.

Match cables to ports (e.g., RCA to CD input).
Turn on the amplifier and select the appropriate input.

Tip: Use high-quality cables for optimal sound quality.

Operating the Amplifier

Adjust volume and tone settings as needed. Use the remote for convenience.

Power on the amplifier.
Select the desired input source.
Adjust volume to a comfortable level.

WARNING! Avoid excessive volume levels to prevent speaker damage.

Maintenance

Keep the amplifier clean and dust-free. Unplug before cleaning.

CAUTION! Do not use liquids; use a dry cloth only.

Regulatory Information

Complies with FCC regulations for residential use. For support, visit www.denon.com or contact customer service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Volume muted or low	Increase volume or unmute.
Distorted sound	Speaker connections	Check speaker wiring and connections.
Remote not working	Battery issue	Replace batteries in the remote.
Input not switching	Faulty input selection	Ensure correct input is selected.

Reset: Unplug for 10 seconds to reset.

Service: Contact Denon support for assistance.