Marantz 2252 Manual

The Marantz 2252 is a classic stereo receiver from the 1970s featuring 52 watts per channel, high-quality audio components, and the iconic Marantz design. This manual covers operation, connections, specifications, and maintenance for optimal performance of this vintage audio equipment.

Features at a Glance

Key components: Stereo receiver with 52 watts RMS per channel, tuner section, preamplifier, power amplifier, and classic Marantz blue dial display.

Feature	Description
Power Output	52 watts per channel RMS at 8 ohms
Tuner Section	AM/FM stereo tuner with signal strength meter
Inputs	Phono, Aux, Tape 1, Tape 2
Outputs	Speaker A/B, Headphone, Tape Out
Tone Controls	Bass, Treble, Loudness contour
Filter	High and low filters
Power Requirements	120V AC, 60Hz
Dimensions	17.5" W × 5.5" H × 14.5" D
Weight	Approximately 25 lbs

Installation

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

1. Connect speakers: Use speaker wire to connect to Speaker A/B terminals.
2. Connect audio sources: Phono for turntable, Aux for CD player, Tape for cassette decks.
3. Connect antenna: FM antenna to FM terminals, AM antenna to AM terminals.
4. Plug into AC power outlet.

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

First-Time Setup

Power on receiver; allow warm-up for optimal performance.

1. Select input source: Turn selector knob to desired input (Phono, Aux, Tape, Tuner).
2. Adjust volume: Start with volume at minimum, gradually increase.
3. Tune FM stations: Use tuning knob and signal meter for best reception.
4. Set tone controls: Adjust bass, treble to preference; engage loudness for low-volume listening.

CAUTION! Do not operate with cover removed. Keep away from moisture and heat sources.

Specifications

• Power Output: 52 watts per channel RMS at 8 ohms
• Frequency Response: 10Hz - 50kHz (+0, -1dB)
• Total Harmonic Distortion: 0.1% at rated power
• Input Sensitivity: Phono: 2.5mV, Aux: 250mV
• Signal-to-Noise Ratio: Phono: 75dB, Aux: 90dB
• Tuner Section: FM sensitivity: 1.9μV
• Power Consumption: 240 watts maximum
• Dimensions: 445mm W × 140mm H × 368mm D

Controls and Settings

Front panel controls: Power switch, Input selector, Volume, Balance, Bass, Treble, Loudness, Filter switches, Speaker selector.

Tuner Section: Tuning knob, FM muting, Mono/stereo selector, Signal strength meter.

Tone Controls: Bass (±10dB at 50Hz), Treble (±10dB at 20kHz). Filters: High filter (cuts above 7kHz), Low filter (cuts below 50Hz). Loudness: Compensates for Fletcher-Munson curve at low volumes.

Connecting Devices

Speaker connections: Use Speaker A/B terminals. Source connections: Phono, Aux, Tape inputs.

1. Turn off power before connecting devices.
2. Connect turntable to Phono inputs (ensure proper grounding).
3. Connect CD player to Aux inputs.
4. Connect tape deck to Tape inputs and outputs.
5. Connect FM antenna to 300-ohm terminals.

Tip: Use high-quality cables for best audio performance. Ensure proper grounding of turntable.

Operation Guide

Supports various audio sources including turntables, CD players, and tape decks.

1. Power on: Turn power switch clockwise.
2. Select source: Rotate input selector to desired source.
3. Adjust volume: Use volume control; start low and increase gradually.
4. Tuner operation: Select FM or AM, tune with knob, use signal meter for best reception.
5. Tape monitoring: Use Tape Monitor for recording and playback.
6. Headphone use: Plug headphones into front panel jack.
7. Speaker selection: Choose Speaker A, B, or both.

WARNING! Do not exceed recommended speaker impedance. Avoid operating at maximum volume for extended periods.

Maintenance

Regular maintenance ensures optimal performance and longevity.

1. Clean controls: Use contact cleaner for scratchy pots and switches.
2. Dust regularly: Use soft brush to remove dust from vents and controls.
3. Check connections: Ensure all cables and speaker connections are secure.
4. Service: For internal cleaning or repairs, consult qualified technician.

Care & Cleaning

Unplug before cleaning. Use dry, soft cloth for exterior. For wood cabinet, use appropriate wood cleaner.

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

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. Manufactured to meet industry standards for audio equipment. For vintage equipment, service may require specialized technicians familiar with classic audio components.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/power	Check speaker wires; ensure power is on; verify input selection
Distorted sound	Overload/damaged speakers	Reduce volume; check speaker condition; verify impedance matching
Poor FM reception	Antenna/placement	Check antenna connections; reposition antenna; ensure proper grounding
Scratchy controls	Dirty potentiometers	Use contact cleaner; rotate controls through full range
Hum or noise	Grounding issues/cables	Check ground connections; use shielded cables; separate from power cables

Service: For technical service, consult qualified vintage audio technician.