Kenwood KA 87 Manual

The Kenwood KA 87 is a high-performance stereo integrated amplifier featuring 80 watts per channel, MM/MC phono input, multiple audio inputs, tone controls, loudness compensation, and speaker A/B switching. 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. Operation Guide 8. Maintenance 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: High-power amplifier section, Phono input (MM/MC), Multiple line inputs, Tone controls, Speaker selector, Headphone output.

Feature	Description
Power Output	80W + 80W (8Ω, 20Hz-20kHz)
Phono Input	MM/MC switchable with loading options
Inputs	CD, Tuner, Aux, Tape 1, Tape 2
Tone Controls	Bass ±10dB, Treble ±10dB
Loudness	Compensation switch
Speaker Selector	A/B/A+B/Off
Headphone Jack	Standard 6.3mm stereo
Power Consumption	280W maximum
Dimensions	430 x 150 x 380mm (W x H x D)
Weight	11.5kg

Installation

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

Connect speakers: Use speaker A/B terminals, observing correct polarity.
Connect audio sources: Use appropriate input jacks (CD, Tuner, Aux, Tape).
Connect phono: Use phono input for turntable with proper grounding.
Plug into AC power outlet.

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

First-Time Setup

Power on amplifier; allow warm-up time for optimal performance.

Select input source: Rotate input selector to desired source.
Adjust volume: Start with low volume and increase gradually.
Set tone controls: Adjust bass and treble to preference.
Select speakers: Choose A, B, or A+B speaker output.
Phono setup: Set MM/MC switch according to cartridge type.

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

Specifications

Power Output: 80W + 80W (8Ω, 20Hz-20kHz, 0.08% THD)
Frequency Response: 5Hz-100kHz (+0, -3dB)
Input Sensitivity: Phono MM: 2.5mV, Phono MC: 0.25mV, Line: 150mV
S/N Ratio: Phono MM: 86dB, Line: 100dB
Tone Control: Bass ±10dB at 100Hz, Treble ±10dB at 10kHz
Power Supply: AC 120V/230V, 50/60Hz
Dimensions: 430 x 150 x 380mm (W x H x D)
Weight: 11.5kg

Controls and Settings

Front panel: Power switch, Input selector, Volume control, Balance control, Tone controls, Loudness switch, Speaker selector, Headphone jack.

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

Input Selection: CD, Tuner, Aux, Phono, Tape 1, Tape 2. Tone Controls: Bass and treble with defeat option. Loudness: Frequency compensation at low volumes. Speaker Selection: A, B, A+B, or off. Balance: Left/right channel balance adjustment.

Connecting Devices

Audio Sources: Use appropriate RCA cables for each input. Speakers: Connect to A/B terminals observing polarity.

Turn off amplifier before connecting devices.
Match input type to source (Phono for turntable, Line for other sources).
Use proper grounding for phono connections.
Ensure secure speaker connections.

Tip: Use high-quality cables for best audio performance.

Operation Guide

Daily operation procedures for optimal performance.

Power on: Allow 30 seconds warm-up for stable operation.
Source selection: Rotate input selector to desired source.
Volume control: Adjust gradually to desired listening level.
Tone adjustment: Use bass/treble controls to suit room acoustics.
Loudness: Engage for enhanced bass at low volumes.
Speaker selection: Choose appropriate speaker combination.
Headphone use: Automatically mutes speaker outputs.

WARNING! Avoid maximum volume settings for extended periods.

Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Keep ventilation openings clear.

CAUTION! Do not use chemical cleaners. Service by qualified personnel only.

Regulatory Information

Complies with applicable safety standards. Manufactured to Kenwood quality standards. For service and support, contact authorized Kenwood service centers. Keep original packaging for service transportation.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Power/speaker selection	Check power connection; verify speaker selection; check volume level.
Distorted sound	Overload/speakers	Reduce volume; check speaker impedance; verify source quality.
Hum or noise	Grounding/cables	Check phono ground; ensure proper cable connections; separate from interference sources.
One channel silent	Balance/connections	Check balance control; verify cable connections; test with different source.
Overheating	Ventilation/impedance	Ensure adequate ventilation; check speaker impedance; reduce volume if necessary.

Service: Contact authorized Kenwood service center for internal repairs.