Denon PMA 850 Service Manual

The Denon PMA 850 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. This manual provides essential information on safety, features, installation, 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 and Care 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: High-quality audio circuitry, multiple input options, remote control, and tone control settings.

Feature	Description
Power Output	70W per channel (8 ohms)
Input Options	Multiple analog inputs, including phono and line inputs
Tone Control	Bass and treble adjustments for personalized sound
Remote Control	Convenient control of amplifier functions
Speaker Outputs	Multiple speaker connections for flexibility

Installation

Unpack and inspect the amplifier. Place it on a stable surface away from heat sources.

Connect audio sources: Use RCA cables for line inputs.
Connect speakers: Use speaker wire to connect to the output terminals.
Plug into AC power: Ensure the power switch is off before plugging in.

WARNING! Ensure all connections are secure to avoid damage.

First-Time Setup

Power on the amplifier and 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.
Test connections: Play audio to ensure all connections are functioning.

CAUTION! Start with low volume to avoid speaker damage.

Specifications

Power Output: 70W per channel (8 ohms).
Frequency Response: 5 Hz - 100 kHz.
Total Harmonic Distortion: < 0.05%.
Input Impedance: 47 kΩ (line).
Signal-to-Noise Ratio: 100 dB.
Dimensions: 440 x 360 x 110 mm.
Weight: 8.5 kg.

Controls and Settings

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

Remote: Volume control, input selection, and mute function.

Connecting Devices

Connect audio sources using RCA cables. Ensure proper matching of inputs and outputs.

Turn off the amplifier and devices before connecting.
Match cables to ports (e.g., RCA to line input).
Select input via the front panel or remote.

Tip: Ensure all connections are secure to prevent audio issues.

Operating the Amplifier

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

Power on: Press the power button.
Select input: Use the input selector.
Adjust volume: Use the volume knob or remote.

WARNING! Avoid sudden volume changes to protect speakers.

Maintenance and Care

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

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

Regulatory Information

This device complies with FCC regulations. For support, visit the Denon website or contact customer service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Incorrect input selection	Check input source and connections.
Distorted sound	Overdriven volume	Reduce volume level.
Remote not working	Dead batteries	Replace remote batteries.
Amplifier overheating	Blocked ventilation	Ensure proper airflow around the unit.

Reset: Refer to the manual for reset instructions if necessary.

Service: Contact Denon support for further assistance.