Marantz PM 730 Manual

The Marantz PM 730 is a high-quality stereo integrated amplifier featuring 70 watts per channel, gold-plated connectors, MM phono input, multiple audio inputs, tone controls, loudness compensation, and direct source monitoring. 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. Operation Guide 8. Maintenance 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: High-power amplifier section, gold-plated input/output connectors, phono stage, tone controls, source direct switching.

Feature	Description
Power Output	70 watts per channel (8 ohms)
Inputs	Phono, CD, Tuner, Aux, Tape 1, Tape 2
Outputs	Speaker A/B, Tape out, Pre out
Tone Controls	Bass and treble adjustment
Loudness	Compensation for low volume listening
Source Direct	Bypasses tone controls for pure signal
Phono Input	MM cartridge compatible
Power Consumption	280 watts maximum
Dimensions	440 x 130 x 360 mm (W x H x D)
Weight	9.5 kg

Installation

Unpack and inspect contents. Place on stable, level surface with adequate ventilation.

Connect speakers: Use speaker wire to connect to Speaker A/B terminals.
Connect audio sources: Use appropriate cables for phono, CD player, tuner, etc.
Connect power cord: Plug into AC power outlet.
Ensure proper ventilation: Leave at least 10cm clearance around unit.

WARNING! Unit contains heavy components; lift with care. Ensure proper grounding.

First-Time Setup

Power on amplifier; follow initial setup procedure.

Speaker selection: Choose Speaker A, B, or A+B using front panel buttons.
Input selection: Rotate input selector to desired source.
Volume control: Set to minimum before powering on.
Tone controls: Adjust bass and treble to preference.
Loudness: Engage for enhanced low-volume listening.

CAUTION! Always turn volume to minimum before switching sources or powering off.

Specifications

Power Output: 70W + 70W (8Ω, 20Hz-20kHz)
Total Harmonic Distortion: 0.02%
Frequency Response: 5Hz-50kHz (+0/-3dB)
Input Sensitivity: Phono: 2.5mV, Line: 150mV
Signal-to-Noise Ratio: Phono: 82dB, Line: 100dB
Tone Control: Bass: ±8dB at 100Hz, Treble: ±8dB at 10kHz
Power Requirements: 120V/230V, 50/60Hz
Dimensions: 440 x 130 x 360 mm (W x H x D)
Weight: 9.5 kg

Controls and Settings

Front Panel: Power switch, Input selector, Volume control, Tone controls, Loudness, Speaker selectors, Source direct.

Rear Panel: Power cord, Phono input, Line inputs, Tape inputs/outputs, Speaker terminals, Pre out.

Tone Controls: Bass and treble adjustment (±8dB). Loudness: Frequency compensation. Source Direct: Bypasses tone circuit. Speaker Selection: A, B, or A+B outputs. Input Selection: Phono, CD, Tuner, Aux, Tape.

Connecting Devices

Phono: Connect turntable with MM cartridge. Line inputs: For CD player, tuner, etc. Tape: For recording devices.

Turn off amplifier before connecting devices.
Use high-quality interconnects for best performance.
Match input type to source device.
Ensure proper grounding for phono connection.
Connect speakers with correct polarity.

Tip: Use gold-plated connectors for optimal signal transfer.

Operation Guide

Supports various audio sources with tone control and monitoring options.

Power on: Switch power button; wait for stabilization.
Select source: Rotate input selector to desired input.
Adjust volume: Start at minimum, increase gradually.
Tone adjustment: Use bass/treble controls as needed.
Loudness: Engage for low-volume listening enhancement.
Source direct: Bypass tone controls for pure audio.
Speaker selection: Choose between A, B, or both.
Tape monitoring: Use for recording and playback.

WARNING! Avoid operating at maximum volume for extended periods.

Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Keep ventilation openings clear.

CAUTION! Do not use liquid cleaners. Avoid moisture near electrical components.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/power	Check speaker wires; ensure power is on; verify input selection.
Distorted sound	Overload/settings	Reduce volume; check source device; verify tone settings.
Hum or noise	Grounding/cables	Check ground connections; use shielded cables; separate from power cords.
One channel silent	Connection/balance	Check speaker and input connections; verify balance control.
Overheating	Ventilation/load	Ensure adequate ventilation; check speaker impedance; reduce volume.

Reset: Power cycle unit if experiencing issues.

Service: Contact authorized Marantz service center for repairs.