Marantz 4140 Owners Manual

The Marantz 4140 is a high-performance stereo receiver featuring 40 watts per channel, AM/FM tuner with quartz PLL synthesizer, multiple audio inputs, phono input for turntables, tape monitoring, loudness control, and tone adjustments. 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 Components 7. Tuner Operation 8. Audio Adjustments 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Stereo amplifier, AM/FM tuner, Input selector, Tone controls, Loudness switch, Tape monitor, Headphone jack.

Feature	Description
Power Output	40 watts per channel into 8 ohms
Tuner Section	AM/FM with quartz PLL synthesizer
Input Selector	Phono, Aux, Tape 1, Tape 2
Tone Controls	Bass and Treble adjustments
Loudness Control	Compensates for low volume listening
Tape Monitor	Allows tape recording and monitoring
Headphone Jack	For private listening
Speaker Selector	A/B speaker switching
Power Switch	Main power on/off
Volume Control	Master volume adjustment

Installation

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

Connect speakers: Use speaker wire to connect to A or B speaker terminals.
Connect audio sources: Phono for turntable, Aux for CD player, Tape for cassette decks.
Connect antenna: FM 75-ohm connector for FM antenna; AM terminals for AM antenna.
Plug into AC power outlet.

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

First-Time Setup

Power on receiver; initialize settings.

Set input selector: Rotate to desired source (Phono, Aux, Tape).
Tuner setup: Extend FM antenna; tune to desired stations.
Speaker selection: Choose A or B speakers using speaker selector.
Audio adjustments: Set bass, treble, and loudness to preference.
Volume control: Start at minimum volume when powering on.

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

Specifications

Power Output: 40 watts per channel (8 ohms, 20Hz-20kHz)
Total Harmonic Distortion: 0.08% at rated power
Frequency Response: 10Hz-50kHz (+0, -3dB)
Input Sensitivity: Phono: 2.5mV, Aux: 150mV
Signal-to-Noise Ratio: Phono: 76dB, Aux: 90dB
Tuner Section: FM stereo, AM broadcast
Tone Controls: Bass: ±10dB at 100Hz, Treble: ±10dB at 10kHz
Power Requirements: 120V AC, 60Hz, 180W
Dimensions: 17-1/4" W × 5-1/4" H × 13-3/4" D
Weight: 22 lbs

Controls and Settings

Front panel controls: Power switch, Input selector, Volume, Balance, Bass, Treble, Loudness, Tape monitor, Speaker selector.

Rear Panel: Speaker terminals, Input jacks, Antenna connections, AC power cord.

Input Selection: Phono (turntable), Aux (CD/tuner), Tape 1/2 (cassette decks). Tone Controls: Bass and Treble with center detent. Loudness: Compensates for Fletcher-Munson curves. Balance: Adjusts left/right channel balance. Speaker Selector: A, B, A+B, or off.

Connecting Components

Speaker connections: A/B terminals. Audio inputs: Phono, Aux, Tape 1/2. Antenna: FM 75-ohm, AM terminals.

Turn off power before making connections.
Connect speakers observing polarity (+/-).
Use RCA cables for audio inputs.
Ensure FM antenna is properly extended.
Select appropriate input source.

Tip: Use high-quality cables and ensure secure connections for best performance.

Tuner Operation

AM/FM tuner with quartz PLL synthesizer for stable reception.

Select Tuner input on selector.
Extend FM antenna fully for best reception.
Tune to desired station using tuning knob.
Stereo indicator lights when receiving stereo FM broadcast.
Use fine tuning for optimal reception.
Preset stations can be memorized (if equipped with memory).

Note: FM reception quality depends on antenna positioning and local signal strength.

Audio Adjustments

Tone controls and audio processing features.

Bass Control: Adjusts low frequencies (±10dB at 100Hz).
Treble Control: Adjusts high frequencies (±10dB at 10kHz).
Loudness: Engages bass boost at low volume levels.
Balance: Adjusts left/right channel balance.
Tape Monitor: Allows monitoring of tape recording.

Recommended: Set tone controls to flat (center detent) for most accurate reproduction.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Avoid liquids and abrasive cleaners.

Ventilation: Ensure adequate airflow around unit. Dust regularly with soft brush.

CAUTION! Do not use chemical cleaners. Keep away from moisture and extreme temperatures.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Manufactured to Marantz quality standards. For service or support, contact authorized Marantz service centers. Specifications subject to change without notice.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Speaker selector off/volume low	Check speaker selector; increase volume; verify connections
Distorted sound	Overload/clipping	Reduce volume; check input levels; verify speaker impedance
Poor FM reception	Antenna positioning	Reposition FM antenna; check connections
Hum or noise	Grounding issues	Check ground connections; separate from power cables
One channel silent	Balance control/cable	Adjust balance; check RCA cables; swap channels to isolate
Unit overheats	Ventilation blocked	Ensure adequate ventilation; check impedance match

Service: Contact authorized Marantz service center for internal repairs.

Safety: Disconnect power before attempting any internal inspection.