Marantz 2285B Owners Manual

The Marantz 2285B is a high-performance stereo receiver featuring 85 watts per channel RMS, advanced FM/AM tuner with quartz-locked PLL synthesizer, dual power supplies, gold-plated input/output connectors, high-current power amplifier, and Marantz's proprietary phono equalizer. 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: High-power amplifier section, Quartz PLL synthesizer tuner, Gold-plated connectors, Dual power meters, Tone controls, Speaker selector.

Feature	Description
Power Output	85 watts per channel RMS (8 ohms, 20Hz-20kHz)
Tuner Section	FM/AM with quartz-locked PLL synthesizer
Inputs	Phono, Aux, Tape 1, Tape 2
Outputs	Speaker A/B, Headphone, Tape Rec
Power Meters	Dual LED power output indicators
Tone Controls	Bass, Treble, Loudness contour
Filter	High filter for noise reduction
Speaker Selector	A/B speaker switching
Protection	DC protection circuit, thermal protection
Power Requirements	120V AC, 60Hz

Installation

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

Connect speakers: Use speaker wire to connect to Speaker A/B terminals.
Connect audio sources: Turntable to Phono input, CD player to Aux input.
Connect antenna: FM antenna to 75-ohm terminal, 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; set initial controls to neutral positions.

Set input selector: Rotate to desired source (Phono, Aux, Tuner).
Adjust volume: Start with volume at minimum, gradually increase.
Tuner setup: Extend FM antenna fully; rotate for best reception.
Speaker selection: Press Speaker A/B buttons for desired speakers.
Tone controls: Set Bass and Treble to 12 o'clock position initially.

CAUTION! Always turn volume to minimum before powering on/off to protect speakers.

Specifications

Power Output: 85 watts per channel RMS at 8 ohms
Frequency Response: 5Hz-50kHz (+0, -3dB)
Total Harmonic Distortion: 0.08% at rated power
Input Sensitivity: Phono: 2.5mV, Aux: 150mV
Signal-to-Noise Ratio: Phono: 76dB, Aux: 90dB
Tuner Section: FM stereo, AM reception
FM Sensitivity: 1.8uV (IHF)
Dimensions: 19-1/4" W x 6-3/4" H x 15-3/4" D
Weight: 35.3 lbs (16 kg)
Power Consumption: 450 watts max

Controls and Settings

Front Panel: Power switch, Input selector, Volume, Balance, Bass, Treble, Loudness, Speaker selectors.

Main Controls: POWER, INPUT SELECTOR (Phono/Aux/Tuner/Tape), VOLUME, BALANCE, BASS, TREBLE, LOUDNESS, SPEAKER A/B, TUNING, FUNCTION switches.

Tone Controls: Bass ±10dB at 100Hz, Treble ±10dB at 10kHz. Filter: High filter at 7kHz. Loudness: Compensation for low-volume listening. Balance: Left/right channel balance. Input Selector: Phono, Aux, Tuner, Tape monitor.

Connecting Components

Speaker connections: Use proper gauge wire, observe polarity. Source connections: Match output to input type.

Turn off power before making connections.
Connect turntable to Phono input (ground wire to ground terminal).
Connect CD player to Aux input using RCA cables.
Connect tape deck to Tape inputs/outputs.
Connect FM antenna to 75-ohm terminal, AM loop antenna to AM terminals.

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

Tuner Operation

FM/AM reception with quartz-locked tuning for stable performance.

Select Tuner input on selector knob.
Extend FM antenna fully and position for best reception.
Use Tuning knob to select station; stereo indicator lights when stereo broadcast received.
For weak stations, engage High Blend to reduce noise.
Use Signal Strength meter to optimize antenna positioning.
AM reception: Connect AM loop antenna and rotate for best reception.

Note: FM antenna positioning is critical for optimal stereo reception.

Audio Adjustments

Fine-tune sound to match room acoustics and personal preference.

Bass Control: Adjust low frequencies (±10dB at 100Hz).
Treble Control: Adjust high frequencies (±10dB at 10kHz).
Loudness: Engage for enhanced bass at low volume levels.
Balance: Adjust left/right channel balance.
High Filter: Reduce high-frequency noise from records or weak FM signals.
Volume: Use power meters as guide; avoid continuous high-power operation.

WARNING! Avoid extreme tone control settings which may cause distortion.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Clean controls with contact cleaner if noisy.

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

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Marantz. For service or technical support, contact authorized Marantz service centers. This product complies with all applicable safety standards.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Speaker selector/connections	Check speaker selector; verify speaker connections; check volume setting.
Distorted sound	Overload/clipping	Reduce volume; check source material; verify proper speaker impedance.
Poor FM reception	Antenna/positioning	Reposition FM antenna; check connections; ensure proper antenna type.
Hum or noise	Grounding/cables	Check turntable ground; replace cables; move away from interference sources.
Protection circuit engaged	Overload/short circuit	Check speaker wires for shorts; allow unit to cool; reduce volume.

Service: Contact authorized Marantz service center for internal repairs.