Harman Kardon 670-A Service manual

HK670

Integrated Amplifier

PRELIMINARY

Service – Technical Manual

Harman International SNC - Harman Consumer International 2, route de Tours 72500 Château du Loir FRANCE

INTRODUCTION 3

Introduction

Congratulations on your choice of the

Harman Kardon HK670 Integrated Amplifier.

In order to obtain the best performance from
this integrated amplifier, please be sure to read
this owner's manual and use your integrated
amplifier only in accordance with its instructions.

The special features of this unit include:

HCC
(High Instantaneous Current Capability)

The amplifier sections react rapidly to musical
transients, providing the instantaneous current
necessary to precisely drive and control nearly
any loudspeaker system.

Ultrawide Bandwidth

The bandwidth of this unit is exceptionally wide
and is independent of negative feedback. This
improves transient accuracy and phase linearity.

Low Negative Feedback

This unit has been designed to have low distor­tion and wide bandwidth without high negative
feedback. This further improves its dynamic
accuracy.

Discrete Component Circuitry

In order to achieve the above goals, all discrete
electronic circuitry has been employed. No avail­able integrated circuits could provide this high
level of performance.

Sophisticated Electronic
Protection Circuitry

Harman Kardon's unique protection circuitry
guards the amplifier from short circuit or dam­aged speakers and wires, without impairing
sound quality by the use of current limiting or
output relays.

General instructions

Always Use at 230V AC

This unit is designed for operation with 230V
AC. Use only domestic AC outlets. Connecting
the unit to an outlet supplying a higher voltage
may create a fire hazard.

Handle the Power Cord Gently

Do not disconnect the plug from the AC outlet
by pulling the cord; always pull the plug itself.
Pulling the cord may damage it. If you do not
intend to use your unit for any considerable
length of time, turn the unit off completely by
pressing the round Power button above “Power”
(see page 5). Do not place furniture or other
heavy objects on the cord, and try to avoid drop­ping heavy objects on it. Also do not tie a knot
in the power cord. Not only may the cord be
damaged, it can also cause a short circuit with a
consequent fire hazard.

Place of installation

Place the unit on a firm and level surface.Avoid
installing your unit under the following condi­tions:

■ Moist or humid places.

■ Places exposed to direct sunlight or

close to heating equipment.

■ Extremely cold locations.

■ Places subject to excessive vibration

or dust.

■ Poorly ventilated places.

Do not obstruct the ventilation slots on the top
surface of the unit by placing objects on them.
Otherwise, the temperature inside the unit may
rise, possibly affecting its long-term reliability.

Moving the Unit

Before moving the unit, be sure to pull out the
power cord from the AC outlet and disconnect
the interconnection cords with other units.

Do Not Open the Cabinet

To prevent shock hazard, do not tamper with
internal components for inspection or mainte­nance. HarmanKardon does not guarantee
against performance degradation resulting from
any modification. If water, a hairpin or wire acci­dentally enters the unit, immediately pull the
plug from the AC outlet to prevent shock and
consult an authorized Harman Kardon service
station. If you use the unit under this condition,
it may cause a fire shock hazard.

Cleaning

If the unit gets dirty, wipe it with a soft dry cloth.
If necessary, wipe it with a soft cloth dampened
with mild soapy water and then with a dry cloth.
Never use benzene, thinner, alcohol or other
volatile agents, and avoid spraying an insecticide
near the unit.

Warning Signs

If you detect an abnormal smell or smoke, imme­diately turn the amplifier off and unplug the
power cord. Contact your dealer or nearest
Harman Kardon service center.

Packaging

Save all packing material. It is essential for ship­ping, should you move, or in the event the unit
ever needs repair.

4 CONNECTIONS

Connections

Connecting Other Components

1. Make sure your amplifier and other compo­nents are turned off.

2. Connect each component's Output/Play jacks
to the corresponding Input jacks on the back
of your amplifier and, if available, the compo­nent’s Input/Record jacks to the Output jacks
of the HK670. Use the white, black or gray
plugs to connect Left channel jacks; use the
red plugs for Right channel jacks.

3. A record player with MM cartridge must be
connected to the Phono Input jacks and a
separate ground wire to the ground terminal
screw above.

Wired Remote Control

To control your amplifier with an external
infrared remote sensor, connect the wire from
the remote sensor to the REMOTE IN jack on the
back panel. Or, if another stereo component has
a built-in infrared remote sensor and a Remote
Output jack, it may be possible to connect this
jack to the REMOTE IN jack of your amplifier.All
Harman Kardon products with »Remote In« and
»Remote Out« jacks are compatible with one
another, except for the Citation 22, 24 and 25.
Other manufacturers' remote sensors and com­ponents may not be compatible, but it will not
hurt to experiment. A second wire may be used
to connect your amplifier's REMOTE OUT jack to
the Remote Input of another stereo component.

Continue this process to include additional com­ponents (if compatible).

Connecting Speakers

1. For best performance, use high quality speak­er cables. However, ordinary copper wire can
be used if the gauge meets the following
requirements:

Wire Min.
Length Diameter

Up to 2.5 meter 1 mm
Up to 4 meter 1.25 mm
Up to 6 meter 1.6 mm
Above 6 meter 2-2.5 mm

2. Avoid rolling excess wire with or near signal
interconnects.

IMPORTANT:When connecting two pairs of
speakers, determine the impedance of each pair
by looking on the back of the speakers, in your
owner's manual, or by contacting your dealer or
manufacturer.

You can listen to two pairs of speakers at
the same time ONLY if the impedance of
EACH speaker is NOT LESS THAN 8 Ohms.

WARNING: Do not play sets of speakers simul-

taneously except as recommended above.Ampli­fier may overheat.

Digital Loop-Through

Digital inputs and outputs are provided only as a
convenience for connecting various digital com­ponents to the “CD”, “CDR” and “AUX” digital
inputs.The corresponding digital input signal is
fed to the “DIGITAL OUT” connector when
“CD”, “CDR” or “AUX” is selected as input
source, to provide a digital signal for CD or MD
Recorders.The HK670 cannot process, decode or
convert any digital signal.

AC Power

Plug the cord into a 230 VAC wall socket.

Record Player

Cassette Tape Deck

Speaker System 1

Left channel

Compact Disc Player

CD Recorder

Speaker System 1

Right channel

Video Player 2

Right channel

Speaker System 2

Left channel

Speaker System 2

Video Player 1 Tuner

CONTROLS AND FUNCTIONS 5

Controls and Functions

Power switches

Press the round Power button (above “Power”)
to turn the amplifier on for the first time.The
status LED behind the flat “Power” button will
turn orange. Once the unit has been turned on
with the round power button, this button should
be left on for normal use and only turned off
when the amplifier will not be used for extended
periods of time (vacation, etc.). For daily use,
press the flat “Power” button to turn the ampli­fier on or off (Standby). In Standby the LED will
glow orange, indicating that the unit is still con­nected to AC mains and can be turned on from
the remote control or with the flat “Power” but­ton.

Headphone Jack

Plug in headphones if desired. With both
“Speaker 1” and “2” selectors in the Off posi­tion, output is supplied only to headphones.

Speaker 1/2 Selectors

Press to select speaker pair 1 or 2, or both, or
neither (headphone output only).

Input Source Selector

Select desired input source for listening by press­ing the “Input Source” button repeatedly (on the
left will select upwards, right downwards) until
the indicator for the desired source is illuminated.

Record Source Selector

Select desired source for recording to device
connected to the rear panel Tape and CDR Out
sockets by pressing the “Record Source”button
repeatedly until the indicator for the desired
source is illuminated.

Bass Control

Turn to increase or decrease the amount of low
frequency sound.

Treble Control

Turn to increase or decrease the amount of high
frequency sound.

Balance Control

Turn to adjust relative output level of left and
right speakers.

Volume Control

Turn to raise or lower output volume.

Source Direct

Press to bypass tone control circuitry.

Indicates source
selected for listening.

Indicates source
selected for recording.

LED Power Mode indication

Red = Protection

Orange= Standby

Green = ON

Source Direct indicator
lights up when “Source
Direct” button has been
pressed to bypass bass
and treble controls.

Speaker 1 and 2
indicators light up
when the correspon­ding speaker pairs
have been selected.

HK 670

HK 670

6 REMOTE CONTROL

Remote Control

Independent Remote Control

The system remote of the HK670 can control the
amplifier and compatible Tuners, CD Players and
CD Recorders.The remote In jack of units without
an integrated IR receiver must be connected to
the amplifier's remote control output jack so that
the system remote control can operate them.

The Function Table below will show all functions
of the HK670 and external devices that can be
controlled by the HK670 remote.

Important Notes:

• For controlling a tuner (only needed for the

numeric buttons), CD Recorder or CD Player
the appropriate input ("TUNER", "CDR" or
"CD") must have been selected with the
source buttons of the remote control (selecting
on the front panel is not sufficient).

• Note that DVD players or tape decks cannot

be controlled by the remote.

• To control a compatible CD Recorder "CDR"

must be selected as input and the drive to be
controlled (CDP or CDR) must be selected
appropriately with the "CDP SELECT" or "CDR
SELECT" buttons.

Operating Conditions

The control unit operates effectively within a dis­tance of 7 meters and an angle of 30° from the
amplifier. Using the control near fluorescent
lights may shorten this range, as will any dust or
dirt that accumulates on the front of the remote
control or the remote sensor area of the amplifi­er. Also avoid blocking the line of sight between
amplifier and remote.

The control unit is powered by two AA batteries,
included with your amplifier. When you replace
weak batteries, replace both at the same time.
When the remote is to be unused for an extend­ed period, remove the batteries to prevent dam­age from corrosion.

321

456

CDR

OFF

TV

CD

987

0

AUX

CDR

TUNER

SELECT

RDS

CDP

PHONO

TAPE

TUNER

VOLUME

POWER

HK 670

CD / CDR

Button HK670 CD Player CD Recorder Tuner
POWER/OFF Power On/Off - - -

II

(Fast Forward) - Fast Forward Fast Forward -

HH

(Fast Reverse) - Fast Reverse Fast Reverse -

JH

(Skip Reverse) - Skip Reverse Skip Reverse -

IK

(Skip Forward) - Skip Forward Skip Forward -

A (Stop) - Stop Stop -
I

(Play) - Play Play ­0 ~ 9 (Numeric Buttons) - Track Select Track Select Preset Select
CD Source Select - - ­CDR Source Select - - ­AUX Source Select - - ­TV Source Select - - ­TUNER Source Select - - ­PHONO Source Select - - ­TAPE Source Select - - ­CDP SELECT - - CDP Drive Select

1)

-

CDR SELECT - - CDR Drive Select

1)

-

RDS - - - RDS Display Select
TUNER

D

- - - Tuning Up

TUNER

E

- - - Tuning Down

VOLUME

D

Volume Up - - -

VOLUME

E

Volume Down - - -

1)

Only needed with CD Recorders

Remote button functions

OPERATING INSTRUCTIONS 7

Operating Instructions

Listening to your CD player, tape
deck, tuner or other source

1. Turn Volume control to minimum level and
press the round Power button (above
”Power”) to turn the unit to Standby, the
power indicator below will light orange.Then
press the flat Power switch to turn on the
amplifier. The power indicator lights red for a
few seconds, while the protection circuitry
checks for short circuit or other problems, and
then it lights green.

2. Press “Speaker 1” to hear loudspeakers con­nected to the rear Speakers 1 terminals. Press
“Speaker 2” to hear loudspeakers connected
to the rear Speakers 2 terminals. Press both to
hear both speaker pairs at once.To listen to
headphones only, press to turn off any active
speaker pair.

3. Select desired source for listening by pressing
the front panel Source button repeatedly until
the indicator for the desired source is illumi­nated or by pressing the desired Source but­ton on the remote.

4. Begin playing the desired source.

5. Adjust the Volume control to the desired level.

6. Adjust Bass, Treble and Balance controls as
desired (the Source Direct function must be
turned off).

7. Press "Source Direct" until the "Source
Direct" indicator lights up to bypass the tone
control and balance circuitry to ensure purest
sound performance. Press again to turn the
bypass function off and to make the tone and
balance controls function again.

Making a recording

You may record any source to tape or to CD-R or
to both simultaneously.You may also connect a
second tape deck to the CDR inputs and outputs
to record from tape to tape (in either direction).

To select the desired source for recording (this
can be a different source than the one being
listened to), press the "Record Source" button
on the front panel repeatedly until the indicator
for the desired record source is illuminated.

NOTE:The record output signal is taken directly
from the program source and is unaffected by
the Volume, Bass, Treble or Balance controls.

Important Notes:

• The functions "Source Direct" and "Record
Source" can be selected on the front panel
only, not from the remote control.

• 3-head cassette decks with monitoring func­tion can be connected to "Tape" or "CDR"
connectors too, but their monitoring function
cannot be used.

8 TROUBLESHOOTING/SPECIFICATIONS

Troubleshooting

This unit is designed for trouble-free operation; most problems users encounter are due to operating errors. So if you have a problem, first check this list for a
possible solution. If the problem persists, consult your authorized Harman Kardon service center.

If the problem is... Make sure that...

No lights illuminate when power cord is plugged into AC outlet. • The unit is plugged into a live outlet.

• The round power button above "Power" on the front panel is pressed in.

No sound is heard. • Speaker switches corresponding to the desired speakers are pressed.

• Correct source button has been pressed.

• Volume is turned up.

• Speaker wires are connected properly.

• Hook-up wires to source component are connected properly.

Sound is not heard from the speaker system on one side. • The speaker wires and connection wires are connected correctly.

• The balance control knob is set to the center.

When listening to stereo sound, the left and right sounds are reversed. • The speaker wires are connected correctly.

• The wires between components are connected correctly.

Intermittent or continuous buzzing or hissing. • The unit is away from fluorescent lights, TV, motors and other electrical appliances.

The remote control and front panel controls don't appear to work. • Disconnect the AC line cord from the wall socket, wait 5 minutes and then re-connect it.

Humming noise when listening to LP • Ground wire from record player has been connected to ground terminal on amplifier.

• Cable from record player is away from power cords and speaker cables.

Howl or ringing when listening to LP. • Record player is not to close to speakers.

• Record player is on stable surface.

Low sound level when listening to LP. • Cable from record player is connected to the Phono jacks.

• The phono cartridge is MM, not MC.

Specifications

NOMINAL

Continuous Average Power Per Channel (FTC) 8 Ohms: 80 Watts@<0.09%THD
20 Hz – 20 kHz, both channels driven 4 Ohms: 120 Watts@<0.3%THD

Dynamic Power (IHF, 1 kHz Tone Burst) 8 Ohms: 115 Watts

4 Ohms: 200 Watts
2 Ohms: 310 Watts

High instantaneous current capability (HCC) ±75 Amps

Power Bandwidth @ Half-Rated output, 8Ω <10 Hz - 150 kHz

Frequency response @ 1W (+0/-3dB) 5 Hz - 150 kHz

Damping factor (20Hz-20k Hz) >125

Signal-to-noise Ratio (Reference rated power output, A-WTD) Tuner/CD 95 dB

Phono (MM): 75 dB

Input sensitivity/Impedance Tuner/CD 270mV/43k Ohms

Phono (MM): 4.0mV/47k Ohms

Overload: Tuner/CD 6V

Phono (MM): 110 mV

Tone control range, Bass @ 50 Hz/Treble @ 10 kHz ±10 dB/±10 dB

Power supply: AC 230V, 50/60 Hz

Power consumption: 345 W

Dimensions (Width X Height X Depth): 439 X 110 X 395 mm

Weight: 10.35 kg

KEY Control Board