marantz 4230 manual pdf

The Marantz 4230 is a quadraphonic stereo receiver featuring 4-channel sound reproduction, 30 watts per channel, built-in CD-4 demodulator, Dolby noise reduction, and comprehensive input/output connectivity. Below are key sections for features, installation, operation, specifications, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Quadraphonic Operation 8. Dolby System 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Quadraphonic amplifier, CD-4 demodulator, Dolby noise reduction, front panel controls, speaker terminals.

Feature	Description
Power Output	30 watts per channel (4 channels)
CD-4 Demodulator	Built-in for discrete 4-channel playback
Dolby System	Noise reduction for tape recording/playback
Input Selector	Phono, Aux, Tuner, Tape 1, Tape 2
Speaker Selector	Front A/B, Rear A/B selection
Mode Selector	Stereo, Quadraphonic, Reverse modes
Tone Controls	Bass, Treble, Loudness contour
Headphone Jack	For private listening
AC Outlets	Switched and unswitched power outlets
FM/AM Tuner	Built-in radio reception

Installation

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

Connect speakers: Match impedance (4-16 ohms); connect front and rear speakers.
Connect audio sources: Phono for turntable, Aux for CD player, Tape for recorders.
Connect antenna: FM 300-ohm terminals for best reception.
Plug into AC power outlet.

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

First-Time Setup

Power on receiver; set initial controls to neutral positions.

Set input selector: Select desired source (Phono, Aux, Tuner).
Adjust volume: Start at minimum, gradually increase to comfortable level.
Select speaker system: Choose Front A/B, Rear A/B as needed.
Tune radio: Use tuning knob for AM/FM stations.
Set mode: Choose Stereo or Quadraphonic based on source material.

CAUTION! Avoid extreme volume levels initially to prevent speaker damage.

Specifications

Power Output: 30W RMS per channel (4 channels)
Total Harmonic Distortion: 0.3% at rated power
Frequency Response: 20Hz-20kHz ±1dB
Input Sensitivity: Phono: 2.5mV, Aux: 150mV
Signal-to-Noise Ratio: Phono: 70dB, Aux: 90dB
Tone Controls: Bass ±10dB at 100Hz, Treble ±10dB at 10kHz
Power Requirements: 120V AC, 60Hz, 250W
Dimensions: 19" W × 6" H × 14" D
Weight: 28 lbs

Controls and Settings

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

Main Controls: POWER, INPUT SELECTOR (Phono/Aux/Tuner/Tape), MODE (Stereo/Quad/Reverse), VOLUME, BALANCE (Front/Rear), BASS, TREBLE, LOUDNESS, SPEAKER SELECTORS.

Quadraphonic Settings: CD-4 demodulator adjustment, separation controls, matrix decoding. Tone Controls: Bass (±10dB), Treble (±10dB), Loudness contour. Speaker Selection: Front A/B, Rear A/B with individual on/off controls.

Connecting Devices

Multiple input options: Phono, Aux, Tuner, Tape 1, Tape 2 with recording capability.

Turn off power before making connections.
Phono input: Connect turntable with ground wire.
Aux input: Connect CD player, tape deck, or other line-level sources.
Tape connections: Use Tape 1/Tape 2 for recording/playback.
Speaker connections: Match polarity (+/-) for proper phasing.

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

Quadraphonic Operation

Supports discrete 4-channel (CD-4) and matrix quadraphonic sources.

CD-4 Mode: For discrete quadraphonic records with special cartridge.
Matrix Mode: For SQ and QS encoded material.
Speaker placement: Front left/right, rear left/right for surround effect.
Balance controls: Separate front/rear balance adjustment.
Mode selection: Choose appropriate setting for source material.

WARNING! Ensure proper CD-4 cartridge alignment for discrete quadraphonic playback.

Dolby System

Built-in Dolby noise reduction for tape recording and playback.

Operation: Engage Dolby switch when recording/playing Dolby-encoded tapes. Calibration: Use built-in test tones for proper level setting. Compatibility: Works with standard Dolby B encoded cassettes.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior; compressed air for controls.

CAUTION! Do not use liquids or solvents on controls. Keep away from moisture and extreme temperatures.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. UL listed for safety. Copyright © 1974 Marantz; trademarks of Marantz Company. For technical support, contact authorized Marantz service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Speaker selection/connections	Check speaker selector; verify connections; ensure volume up.
Distorted sound	Overload/incorrect input	Reduce volume; check input selection; verify source levels.
No quadraphonic effect	Mode selection/source	Set to Quad mode; ensure quadraphonic source material.
Hum or noise	Grounding/cables	Check ground connections; use shielded cables; separate from power cords.
CD-4 not working	Cartridge/settings	Verify CD-4 compatible cartridge; adjust demodulator settings.

Service: Contact authorized Marantz service center for internal repairs.