Harman Kardon HK680 - Troubleshooting Common Issues; No Lights or No Sound; Sound Problems; Tone Control and Phono Issues

Listening to your CD player, tape
deck, tuner or other component
sound source
1. Turn Volume control to minimum level
and press the Power switch to turn on
the amplifier. The power indicator
lights up.
2. Set the Speakers switches to play
speakers 1, 2, both or neither (for
headphone use).
3. Press the Listen selector button
corresponding to the component you
wish to hear.
4. Begin playing the desired
components.
5. Adjust the Volume control to the
desired level.
6. Adjust Bass, Treble and Balance
controls as desired.
NOTE: If you have the optional Phono
board installed, press the Aux 2 button
to listen to the turntable.
listen Tape Tape 2 co Tuner Video Aux Aux2
Rec Tape! Tape2 cD Tuner Video Aux Aux2
Making a Recording
To make a recording on a tape deck,
simply press the Rec selector button that
corresponds to the piece of equipment
you wish to record from. The Rec output
will be supplied to Tape 1 and Tape 2,
enabling you to record on any, or both
simultaneously.
(a) To record from one tape device to
another, press the Rec selector button
corresponding to the “Rec From” (play)
device.
(b) By selecting different sources for
Listen and Rec, you may listen to one
audio, while recording from another.
NOTE 1: If a 3-head tape deck is
connected to TAPE 1 or TAPE 2 jacks,
you can monitor the actual recording
while it is in process. Press Listen
selector button that corresponds to the
connected jack.
NOTE 2: The record output signal is
carried directly from the program source
without being influenced by the Volume,
Bass, Treble or Balance control.
OPERATING INSTRUCTIONS
Independent Remote Control
The keys on the remote control unit
function the same as the corresponding
buttons on the amplifier itself.
The remote control unit also includes
many keys that allow for easy control of
other Harman Kardon cassette tape
deck, CD player and tuner.
Please refer to the owner's manual for
each unit for operating instructions.
Some of these units must be connected
to the amplifier’s remote contro! output
jacks so that the system remote control
can operate them.
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.
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