Marantz 1150 Manual

The Marantz 1150 is a high-performance stereo receiver featuring 35 watts per channel RMS, built-in AM/FM tuner with quartz PLL synthesizer, phono input for turntables, tape monitor circuits, loudness control, and comprehensive tone controls. Below are key sections for features, installation, operation, specifications, and maintenance.

1. Features at a Glance 2. Installation 3. Operation 4. Specifications 5. Controls and Functions 6. Connecting Components 7. Tuner Operation 8. Maintenance 9. Troubleshooting

Features at a Glance

Key components: Power amplifier section, AM/FM stereo tuner, Phono preamp, Tone controls, Speaker outputs.

Feature	Description
Power Output	35 watts per channel RMS (8 ohms)
Tuner Section	AM/FM stereo with quartz PLL synthesizer
Phono Input	MM cartridge compatible
Tape Monitor	Two tape monitor circuits
Tone Controls	Bass, treble, and loudness contour
Speaker Outputs	Main and remote speaker terminals
Headphone Jack	Front panel 1/4" stereo jack
Power Switch	Main power on/off with indicator light
Volume Control	Dual concentric with balance control
Input Selector	Phono, Aux, Tuner, Tape 1, Tape 2

Installation

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

Connect speakers: Use speaker wire to connect to main speaker terminals.
Connect turntable: Use phono input for magnetic cartridges.
Connect tape deck: Use tape 1 or tape 2 inputs/outputs.
Connect antenna: FM 300 ohm and 75 ohm inputs; AM loop antenna.
Plug into AC power outlet.

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

Operation

Power on receiver; select input source.

Select input: Turn selector to Phono, Tuner, Aux, or Tape.
Adjust volume: Start with low volume and increase gradually.
Tone controls: Adjust bass and treble to preference.
Loudness: Engage for better low-level listening.
Speaker selection: Choose Main or Remote speakers.

CAUTION! Avoid excessive volume levels to prevent speaker damage.

Specifications

Power Output: 35 watts per channel RMS at 8 ohms
Total Harmonic Distortion: 0.3% at rated output
Frequency Response: 20Hz - 20kHz ±1dB
Input Sensitivity: Phono: 2.5mV, Aux: 150mV
Signal-to-Noise Ratio: Phono: 70dB, Aux: 85dB
Tone Controls: Bass: ±10dB at 100Hz, Treble: ±10dB at 10kHz
Power Requirements: 120V AC, 60Hz
Dimensions: 17-1/4" W × 5-1/4" H × 13-3/4" D
Weight: 22 lbs

Controls and Functions

Front Panel: Power switch, Input selector, Volume/Balance, Tone controls, Loudness, Speaker selectors.

Rear Panel: Speaker terminals, Phono inputs, Aux inputs, Tape inputs/outputs, Antenna terminals, AC power cord.

Input Selection: Phono, Aux, Tuner, Tape 1, Tape 2. Tone Controls: Bass, Treble, Loudness contour. Speaker Selection: Main A, Main B, Remote. Tuner Controls: Tuning knob, FM mode (Stereo/Mono), Signal strength meter.

Connecting Components

Speakers: Main speaker terminals. Turntable: Phono inputs. Tape Deck: Tape monitor circuits. Antenna: FM 300 ohm/75 ohm; AM loop.

Turn off power before making connections.
Match cable types to appropriate inputs.
Ensure proper grounding for turntable.
Use high-quality interconnects for best performance.

Tip: Keep signal cables away from power cords to reduce hum.

Tuner Operation

AM/FM stereo tuner with quartz PLL synthesizer.

Select Tuner input on front panel.
Choose AM or FM band.
Tune to desired station using tuning knob.
Monitor signal strength meter for best reception.
For weak FM stations, switch to Mono mode.
Use FM muting to eliminate inter-station noise.
Preset stations can be memorized (if equipped).

WARNING! Ensure proper antenna connection for best reception.

Maintenance

Keep unit clean and dust-free. Use soft, dry cloth for cleaning.

CAUTION! Unplug before cleaning. Do not use liquid cleaners. Service by qualified technician only.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/input selection	Check speaker wires; verify input selector position.
Hum or noise	Grounding issues/cable placement	Ensure proper grounding; separate signal and power cables.
Weak FM reception	Antenna connection	Check FM antenna; adjust antenna position.
One channel dead	Balance control/cable	Check balance setting; verify interconnect cables.
Distorted sound	Overload/speaker impedance	Reduce volume; check speaker impedance match.

Service: Contact authorized Marantz service center for repairs.