Harman Kardon HK680 - General Instructions and Safety; Always Use at 230 V AC; Do Not Open the Cabinet

Congratulations on your choice of the
Harman Kardon 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-
circuited 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.
Never connect the unit to an outlet
supplying a higher voltage. This 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,
disconnect the plug from the AC outlet.
Do not place furniture or other heavy
objects on the cord, and try to avoid
dropping heavy objects upon it. Also do
not make 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.
HK680 OWNER’S MANUAL
Place of Installation
Place the unit on a firm and level
surface. Avoid installing your unit under
the following conditions:
HB Moist or humid places.
l@ 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 over them.
Otherwise, the temperature inside the
unit may rise, possibly affecting its long-
term reliability.
Do Not Open the Cabinet
To prevent shock hazard, do not tamper
with internal components for inspection
or maintenance. Harman Kardon does
not guarantee against performance
degradation resulting from any
modification. If water, a hairpin or wire
accidentally enters the unit, immediately
extract 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 or shock hazard.
In Case of 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.
Abnormal Smells
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.
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 agent, and avoid spraying
an insecticide near the unit.
Packaging
Save all packing material. It is essential
for shipping should you move, or in the
event the unit ever needs repair.