Marantz 2230B Owners Manual

The Marantz 2230B is a classic stereo receiver featuring 30 watts per channel RMS power, high-quality audio performance, and the iconic Marantz blue dial display. This vintage audio component includes AM/FM tuner, multiple audio inputs, speaker outputs, headphone jack, and traditional analog controls. Below are key sections for safety, features, installation, setup, operation, and maintenance.

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 receiver with AM/FM tuner, traditional analog controls, Marantz blue dial display, multiple input/output connections.

Feature	Description
Power Output	30 watts per channel RMS into 8 ohms
Tuner Section	AM/FM stereo with analog tuning
Inputs	Phono, Aux, Tape 1, Tape 2
Outputs	Speaker A/B, Headphone, Tape Out
Tone Controls	Bass, Treble, Loudness contour
Filter Controls	High and Low filters
Power Switch	Main power on/off with indicator light
Volume Control	Analog potentiometer with smooth rotation
Balance Control	Left/Right channel balance adjustment
Mode Switch	Stereo/Mono selection for FM reception

Installation

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

Connect speakers: Use speaker wire to connect to Speaker A or B terminals.
Connect audio sources: Use appropriate cables for turntable (phono), CD player (aux), or tape deck.
Connect antenna: FM antenna to FM terminals, AM antenna to AM terminals.
Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not block ventilation openings. Use correct speaker impedance (4-16 ohms).

First-Time Setup

Power on receiver; allow 30 seconds for warm-up.

Select input source: Turn selector knob to desired input (Phono, Aux, Tape).
Adjust volume: Start with volume at minimum, gradually increase to desired level.
Tune FM stations: Use tuning dial and stereo indicator for best reception.
Set tone controls: Adjust bass and treble to personal preference.

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

Specifications

Power Output: 30 watts per channel RMS at 8 ohms
Frequency Response: 20Hz to 20kHz ±1dB
Total Harmonic Distortion: Less than 0.3% at rated power
Input Sensitivity: Phono: 2.5mV, Aux: 250mV
Signal-to-Noise Ratio: Phono: 70dB, Aux: 85dB
Tuner Section: FM stereo, AM broadcast
Power Requirements: 120V AC, 60Hz
Dimensions: Standard 19-inch rack width
Weight: Approximately 25 lbs

Controls and Settings

Front panel controls: Power Switch, Input Selector, Volume, Balance, Bass, Treble, Loudness, Filter switches, Mode selector.

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

Tone Controls: Bass (±10dB at 50Hz), Treble (±10dB at 10kHz). Filters: High filter (cuts above 7kHz), Low filter (cuts below 70Hz). Loudness: Compensates for low-volume listening. Balance: Adjusts left/right channel level.

Connecting Components

Speaker Connections: Use 16-gauge or larger speaker wire. Audio Inputs: Phono for turntable, Aux for CD player, Tape for recording devices.

Turn off power before making connections.
Connect speakers observing correct polarity (+/-).
Use shielded cables for audio inputs to prevent hum.
Connect FM antenna for best reception.

Tip: Keep signal cables away from power cords to minimize interference.

Tuner Operation

AM/FM stereo tuner with analog tuning dial.

Select Tuner input on selector knob.
Adjust tuning dial for desired station.
Use stereo indicator to optimize FM reception.
Use Mode switch for weak FM signals (switch to Mono).
Fine-tune for clearest reception and minimum distortion.

WARNING! Do not force tuning dial; turn gently for precise station selection.

Audio Adjustments

Tone Controls: Adjust bass and treble to suit room acoustics and program material. Loudness: Engages bass boost at low volume levels. Filters: Reduce high-frequency hiss or low-frequency rumble.

Care & Maintenance

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

CAUTION! Do not use solvents or abrasives. Keep away from moisture and extreme temperatures.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. Copyright © 1970s Marantz Company; Marantz is a registered trademark. For vintage service information, consult authorized Marantz service centers. This product meets applicable UL standards.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Speaker connections/input selection	Check speaker wires; verify input selector position; ensure volume up.
Hum or buzz	Grounding issues/cable placement	Check ground connections; separate audio cables from power cords.
Weak FM reception	Antenna connection	Improve FM antenna placement; use external antenna for better reception.
Scratchy controls	Dust/oxidation	Use contact cleaner on potentiometers; rotate controls fully several times.
One channel silent	Balance control/cable	Check balance control position; verify audio cables; swap channels to isolate.

Service: Consult qualified technician for internal repairs. Use only original Marantz parts for authenticity.