Marantz ST-432 User Manual

The Marantz ST-432 is a high-performance stereo tuner featuring advanced digital tuning technology, RDS (Radio Data System) functionality, 30 station presets, auto/manual tuning modes, quartz PLL synthesizer tuning system, and multiple audio outputs. Designed for audiophile-grade FM/AM reception with low distortion and high sensitivity. 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 Devices 7. Operation Modes 8. RDS Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital tuner with RDS, Front panel controls, Remote control sensor, Antenna terminals, Audio output jacks.

Feature	Description
FM/AM Tuner	Quartz PLL synthesizer tuning system
RDS Functionality	Radio Data System for station information
Station Presets	30 memory presets (20 FM, 10 AM)
Tuning Modes	Auto and manual tuning options
Audio Outputs	Fixed and variable output jacks
Antenna Inputs	300 ohm balanced and 75 ohm unbalanced
Display	Fluorescent display with station information
Remote Control	Infrared remote operation
Power Supply	AC 120V, 60Hz operation
Dimensions	Standard component width (17.3 inches)

Installation

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

Connect antennas: FM 75 ohm coaxial or 300 ohm wire; AM loop antenna.
Connect audio outputs: Use RCA cables to amplifier/receiver inputs.
Connect AC power cord to wall outlet.
Ensure proper ventilation around unit.

WARNING! Do not place near heat sources or in humid environments. Ensure proper grounding.

First-Time Setup

Power on tuner; initialize system settings.

Select band: Press FM/AM button to choose desired band.
Auto tuning: Press TUNING + or - for automatic station search.
Store presets: Tune to desired station, press MEMORY, then preset number.
Set display brightness: Use DIMmer button if available.
Configure RDS: Enable RDS functions in setup menu.

CAUTION! Ensure proper antenna connection for optimal reception quality.

Specifications

Tuning Range: FM 87.5-108 MHz, AM 530-1710 kHz
Usable Sensitivity: FM 10.3 dBf (1.8 μV), AM 30 μV
Signal-to-Noise Ratio: FM 85 dB, AM 50 dB
Total Harmonic Distortion: FM 0.1%, AM 0.3%
Selectivity: FM 70 dB, AM 35 dB
Output Level: Fixed 500 mV, Variable 0-500 mV
Power Consumption: 12 watts
Dimensions: 17.3" W × 4.4" H × 13.4" D
Weight: 11.7 lbs

Controls and Settings

Front Panel: POWER, FM/AM selector, TUNING buttons, MEMORY, PRESET buttons, DISPLAY.

Remote: POWER, Numeric buttons, FM/AM, TUNING, PRESET, MUTE, DISPLAY.

Tuning: Auto seek or manual tuning. Memory: Store 30 stations (20 FM/10 AM). Display: Station frequency, RDS information, preset number. Audio: Fixed/variable output selection. RDS: PS (Program Service), PTY (Program Type), RT (Radio Text).

Connecting Devices

Audio System: Connect to amplifier/receiver AUX or TUNER inputs. Antennas: Proper FM and AM antenna connections.

Turn off all equipment before connecting.
Connect audio outputs to amplifier using RCA cables.
Connect FM antenna to 75 ohm terminal.
Connect AM loop antenna to AM terminals.
Select TUNER input on amplifier.

Tip: Use high-quality cables and proper antenna placement for best performance.

Operation Modes

Supports multiple tuning and reception modes.

Band selection: Press FM/AM to switch between bands.
Auto tuning: Press TUNING + or - for automatic station seek.
Manual tuning: Hold TUNING button for fine adjustment.
Preset recall: Press numbered PRESET buttons for stored stations.
Mute function: Press MUTE to temporarily silence audio.
Display modes: Cycle through display information with DISPLAY button.

WARNING! Avoid operating near strong electromagnetic interference sources.

RDS Features

Radio Data System provides enhanced broadcast information.

PS (Program Service): Station name display
PTY (Program Type): Music genre classification
RT (Radio Text): Song titles and artist information
CT (Clock Time): Accurate time display
AF (Alternative Frequencies): Automatic switching to stronger signals

Enable RDS functions through display settings menu.

Care & Cleaning

Unplug before cleaning. Use soft, dry cloth for exterior. Avoid chemical cleaners.

CAUTION! Do not use liquids or aerosols. Keep ventilation openings clear of dust.

Regulatory Information

FCC Part 15: Class B digital device compliant. CE marked for European compliance. Manufactured under quality standards. Copyright © Marantz. For support, contact authorized Marantz service centers or visit www.marantz.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound output	Connection/amplifier settings	Check audio cables; verify amplifier input selection; ensure power on.
Poor reception	Antenna placement/connection	Reposition antenna; check connections; use outdoor antenna for weak areas.
Presets not stored	Memory battery/operation	Follow memory procedure correctly; check internal battery.
Display not working	Power/display settings	Check power connection; adjust display brightness settings.
Remote not functioning	Batteries/obstructions	Replace batteries; ensure clear path to sensor; check remote mode.

Reset: Disconnect power for 30 seconds to reset microprocessor.

Service: Contact authorized Marantz service center for repairs.