Marantz 5120 Manual

The Marantz 5120 is a high-performance stereo receiver featuring AM/FM tuner, phono input, tape monitor, loudness control, and multiple audio inputs. With 20 watts per channel RMS power output, tone controls, speaker selector, and headphone jack. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: AM/FM stereo tuner, phono input, tape monitor, loudness control, speaker selector, headphone jack.

Feature	Description
Power Output	20 watts per channel RMS at 8 ohms
Tuner Section	AM/FM stereo with manual tuning
Phono Input	For turntable connection (MM cartridge)
Tape Monitor	Tape input/output with monitor function
Loudness Control	Compensates for low volume listening
Speaker Selector	A/B speaker switching
Headphone Jack	For private listening
Tone Controls	Bass and treble adjustment
Input Selector	Phono, Aux, Tape
Power Switch	Main power on/off

Installation

Unpack and inspect contents. Place on stable, well-ventilated surface.

1. Connect speakers: Use speaker wire to connect to A or B speaker terminals.
2. Connect antenna: Attach FM antenna to 75-ohm terminal; AM loop antenna to AM terminals.
3. Connect audio sources: Phono for turntable, Aux for CD player, Tape for cassette deck.
4. Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not block ventilation openings. Use correct speaker impedance.

First-Time Setup

Power on receiver; follow initial setup procedure.

1. Set input selector to desired source (Phono, Aux, or Tape).
2. Adjust volume to minimum before powering on.
3. Tune FM stations: Rotate tuning dial for best reception.
4. Set tone controls to flat position for initial listening.
5. Select speaker output (A, B, or A+B).

CAUTION! Always turn volume to minimum when powering on to prevent speaker damage.

Specifications

• Power Output: 20 watts per channel RMS at 8 ohms.
• Frequency Response: 20Hz - 20kHz ±1dB.
• Total Harmonic Distortion: Less than 0.5% at rated power.
• Input Sensitivity: Phono: 2.5mV, Aux: 150mV.
• Signal-to-Noise Ratio: Phono: 70dB, Aux: 80dB.
• Tone Controls: Bass: ±10dB at 100Hz, Treble: ±10dB at 10kHz.
• Speaker Impedance: 4-16 ohms.
• Power Requirements: 120V AC, 60Hz.
• Dimensions: 17" W × 4.5" H × 12" D.

Controls and Settings

Front Panel: Power switch, Input selector, Volume, Balance, Bass, Treble, Loudness, Speaker selector, Tuning dial, Function switch.

Rear Panel: Speaker terminals, Phono input, Aux input, Tape input/output, Antenna terminals, AC power cord.

Audio Controls: Bass (±10dB), Treble (±10dB), Balance (L/R adjustment), Loudness (on/off). Speaker Selection: A, B, A+B. Input Selection: Phono, Aux, Tape. Tuner: AM/FM selection, tuning dial, signal strength meter.

Connecting Devices

Phono: For turntable with magnetic cartridge. Aux: For CD player, tuner, or other line-level sources. Tape: For cassette deck recording/playback.

1. Turn off receiver before making connections.
2. Match cable types to appropriate inputs (RCA cables for audio).
3. Ensure proper grounding for phono input.
4. Select correct input source on front panel.

Tip: Use high-quality cables and keep audio cables away from power cords to reduce hum.

Tuner Operation

AM/FM stereo reception with manual tuning.

1. Select AM or FM on function switch.
2. Rotate tuning dial slowly for station selection.
3. Watch signal strength meter for best reception.
4. Adjust antenna for optimal FM reception.
5. Use stereo indicator to identify FM stereo broadcasts.

WARNING! Do not force tuning dial; turn gently. Ensure proper antenna connection for best reception.

Audio Controls

Tone Controls: Adjust bass and treble to preference. Loudness: Compensates for Fletcher-Munson curve at low volumes. Balance: Adjusts left/right channel balance. Tape Monitor: Allows monitoring of tape deck recording.

Care & Cleaning

Unplug before cleaning. Use soft, dry cloth for exterior. Use contact cleaner for controls if scratchy.

CAUTION! Do not use liquids or solvents on controls or finish. Keep away from moisture.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Marantz; all rights reserved. For technical support, contact authorized Marantz service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Speaker connections/selector	Check speaker wires; ensure speaker selector is set correctly.
Hum in phono input	Ground connection	Ensure turntable ground wire connected to ground terminal.
Poor FM reception	Antenna placement	Reposition FM antenna; ensure proper connection.
Distorted sound	Overload/volume	Reduce volume; check input levels from source components.
One channel silent	Balance control/cables	Check balance control; verify audio cables connected properly.

Reset: Turn unit off and on again if controls become unresponsive.

Service: Contact authorized Marantz service center for repairs.