Kenwood KR 4070 Manual

The Kenwood KR 4070 is a high-performance stereo receiver featuring 45 watts per channel RMS power output, AM/FM tuner with quartz PLL synthesis, 8 preset station memory, loudness control, tape monitoring, phone input, and multiple audio inputs. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Stereo receiver with AM/FM tuner, front panel controls, rear input/output terminals, remote control capability.

Feature	Description
Power Output	45 watts per channel RMS (8 ohms)
Tuner Section	AM/FM with quartz PLL synthesis
Preset Memory	8 stations (FM 5, AM 3)
Inputs	Phono, CD, Tape 1, Tape 2, Aux
Outputs	Speaker A/B, Tape out, Headphone
Controls	Volume, Balance, Bass, Treble, Loudness
Display	Signal strength, tuning, station frequency
Power Supply	AC 120V, 60Hz
Dimensions	440mm W x 150mm H x 370mm D
Weight	8.5 kg

Installation

Unpack and inspect contents. Place on stable, level surface with adequate ventilation.

1. Connect speakers: Use speaker wire to connect to SPEAKER A/B terminals.
2. Connect antenna: FM 75 ohm coaxial and AM loop antenna.
3. Connect audio sources: Phono, CD, Tape decks to respective inputs.
4. Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not block rear vents. Use correct speaker impedance.

First-Time Setup

Power on receiver; initialize settings.

1. Set speaker configuration: Select SPEAKER A/B or both.
2. Tune stations: Use AUTO or MANUAL tuning to find stations.
3. Store presets: Press MEMORY then number buttons for station storage.
4. Adjust audio: Set bass, treble, balance to preference.

CAUTION! Do not connect speakers while powered on. Ensure all connections are secure.

Specifications

• Power Output: 45W + 45W (8 ohms, 20Hz-20kHz)
• Total Harmonic Distortion: 0.08%
• Frequency Response: 10Hz-50kHz
• Input Sensitivity: Phono: 2.5mV, CD/Aux: 150mV
• Signal-to-Noise Ratio: Phono: 76dB, CD/Aux: 90dB
• Tuner Section: FM 87.5-108MHz, AM 530-1710kHz
• Preset Stations: 8 total (FM 5, AM 3)
• Power Consumption: 180W
• Dimensions: 440 x 150 x 370 mm (W x H x D)

Controls and Settings

Front Panel: POWER, VOLUME, INPUT SELECTOR, BASS, TREBLE, BALANCE, LOUDNESS, TUNING, MEMORY, SPEAKER A/B.

Rear Panel: AC input, Speaker terminals, Phono input, Line inputs, Tape loops, Antenna terminals.

Audio Controls: Bass (±10dB at 100Hz), Treble (±10dB at 10kHz), Balance (L/R adjustment), Loudness (low frequency boost). Input Selection: Phono, CD, Tape 1, Tape 2, Aux. Speaker Selection: A, B, A+B. Tuner Controls: Manual/Auto tuning, Memory storage, FM Mono/Stereo.

Connecting Devices

Speakers: Use 16-8 ohm speakers. Audio Sources: Connect turntable to PHONO, CD player to CD, tape decks to TAPE 1/2.

1. Turn off power before making connections.
2. Match input sources to correct terminals.
3. Use proper cables (RCA for audio, speaker wire for speakers).
4. Connect antennas securely.

Tip: Keep audio cables away from power cords to reduce interference.

Tuner Operation

AM/FM reception with preset memory.

1. Select tuner mode: Press TUNER button.
2. Tune stations: Use TUNING buttons or dial.
3. Store presets: Tune to station, press MEMORY, then number (1-8).
4. Recall presets: Press corresponding number button.
5. FM mode: Select stereo or mono for weak signals.
6. Signal strength: Monitor display for best reception.

WARNING! Ensure proper antenna connection for best reception quality.

Audio Controls

Tone controls and audio adjustments.

1. Bass/Treble: Adjust frequency response to preference.
2. Balance: Center sound between left and right speakers.
3. Loudness: Engage for enhanced bass at low volumes.
4. Volume: Adjust output level as needed.
5. Tape monitoring: Monitor tape recording/playback.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Keep away from moisture and heat sources.

CAUTION! Do not use liquid cleaners. Avoid blocking ventilation openings.

Regulatory Information

FCC compliant for home use. Manufactured to meet industry standards. Copyright © Kenwood Corporation. For support, contact authorized Kenwood service centers or visit www.kenwood.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power cord/outlet	Check power connection; ensure outlet is working.
No sound	Speaker connections/volume	Verify speaker wires; check volume level; confirm input selection.
Poor FM reception	Antenna/position	Adjust FM antenna; ensure proper connection.
Distorted sound	Overload/speakers	Reduce volume; check speaker impedance.
Presets lost	Power interruption	Re-program stations after power restoration.

Reset: Disconnect power for 30 seconds to reset microprocessor.

Service: Contact authorized Kenwood service center for repairs.