DOWNLOAD Harman Kardon HK 3470 (serv.man10) Service Manual ↓ Size: 313 KB | Pages: 20 in PDF or view online for FREE

3 INTRODUCTION

Congratulations! With the purchase of the
Harman Kardon HK 3470 you are about to
begin many years of listening enjoyment. The
HK 3470 has been custom-designed to provide
all the excitement and power of rock, jazz and
popular music, and every nuance of classical
selections.

While sophisticated systems are hard at work
within the HK 3470 to make all of this happen,
hookup and operation are simple. Color-keyed
connections and a comprehensive remote con-
trol make the HK 3470 easy to use.

To obtain maximum enjoyment from your new
receiver, we urge you to take a few minutes to
read through this manual. This will ensure that
connections to speakers, source playback units
and other external devices are made properly.
In addition, a few minutes spent learning the
functions of the various controls will enable 
you to take advantage of all the power the
HK 3470 is able to deliver.

If you have any questions about this product, its
installation or operation, please contact your
dealer, your best local source of information.

Description and Features
Harman Kardon’s HK 3470 is the world’s first
stereo receiver to offer VMAx

®

. VMAx is a pro-

prietary signal-processing technique that cre-
ates an open, spacious sound field when only
two loudspeakers are available. VMAx circuitry
is able to decode the ambience of a concert
hall or theater from a stereo recording.

The HK 3470 is a full-featured stereo receiver,
with five inputs and an FM Stereo/FM/AM tuner
with capabilities that provide for the utmost
flexibility. A high-quality phono input is avail-
able so that you may continue to enjoy your
existing record collection as well as the latest 
CD recordings.

The HK 3470’s powerful amplifier uses
traditional Harman Kardon High-Current Design
philosophies to meet the wide dynamic range
of any program selection.

Harman Kardon invented the high-fidelity
receiver more than forty-seven years ago. With
state-of-the-art features and time-honored cir-
cuit designs, the HK 3470 is one of the finest
receivers ever offered by Harman Kardon.

■ Harman Kardon-Designed High-

■ VMAx Processing Mode – Exclusive to

■ Phono Input Section

■ Speaker 1/Speaker 2 Outputs for High-

■ Pre-Out/Main-In Jacks for Use With

■ Programmable Learning Remote

■ Subwoofer Outputs

Verify Line Voltage Before Use
Your HK 3470 has been designed for use with
120-volt AC current. Connection to a line volt-
age other than that for which it is intended can
create a safety and fire hazard, and may dam-
age the unit.

If you have any questions about the voltage
requirements for your specific model, or about
the line voltage in your area, contact your sell-
ing dealer before plugging the unit into a wall
outlet.

Do Not Use Extension Cords
To avoid safety hazards, use only the power
cord attached to your unit. We do not recom-
mend that extension cords be used with this
product. As with all electrical devices, do not
run power cords under rugs or carpets or place
heavy objects on them. Damaged power cords
should be replaced immediately with cords
meeting factory specifications.

Handle the AC Power Cord Gently
When disconnecting the power cord from an AC
outlet, always pull the plug – never pull the
cord. If you do not intend to use the unit for
any considerable length of time, disconnect the
plug from the AC outlet.

CAUTION: To prevent electric shock,

 do not use this (polarized) 

plug with an extension cord, 

receptacle or other outlet 

unless the blades can 

be fully inserted to 

prevent blade exposure.

The lightning flash with arrowhead symbol, 
within an equilateral triangle, is intended to 
alert the user to the presence of uninsulated 

“dangerous voltage” within the product’s 

enclosure that may be of sufficient magnitude to constitute a 
risk of electric shock to persons.

The exclamation point within an equilateral 
triangle is intended to alert the user to the 
presence of important operating and 
maintenance (servicing) instructions in the 

literature accompanying the appliance.

4 SAFETY INFORMATION

Do Not Open the Cabinet
There are no user-serviceable components
inside this product. Opening the cabinet may
present a shock hazard, and any modification
to the product will void your guarantee. If water
or any metal object such as a paper clip, wire
or staple accidentally falls inside the unit, dis-
connect it from the AC power source immedi-
ately and consult an authorized service station.

CATV or Antenna Grounding
If an outside antenna or cable system is con-
nected to this product, be certain that it is
grounded so as to provide some protection
against voltage surges and static charges.
Section 810 of the National Electrical Code,
ANSI/NFPA No. 70-1984, provides information
with respect to proper grounding of the mast
and supporting structure, grounding of the
lead-in wire to an antenna discharge unit, size
of grounding conductors, location of antenna
discharge unit, connection to grounding elec-
trodes and requirements of the grounding elec-
trode.

NOTE TO CATV SYSTEM INSTALLER: This
reminder is provided to call the CATV (Cable TV)
system installer’s attention to article 820-40 of
the NEC that provides guidelines for proper
grounding and, in particular, specifies that the
cable ground shall be connected to the ground-
ing system of the building, as close to the point
of cable entry as possible.

Installation Location
■ To ensure proper operation and to avoid the

potential for safety hazards, place the unit
on a firm and level surface. When placing the
unit on a shelf, be certain that the shelf and
any mounting hardware can support the
weight of the product.

■ Make certain that proper space is provided

both above and below the unit for ventila-
tion. If this product will be installed in a cab-
inet or other enclosed area, make certain
that there is sufficient air movement within
the cabinet. Under some circumstances a fan
may be required.

■ Do not place the unit directly on a carpeted

surface.

■ Avoid installation in extremely hot or cold

locations, or an area that is exposed to direct
sunlight or heating equipment.

■ Avoid moist or humid locations.

■ Do not obstruct the ventilation slots on the

top of the unit or place objects directly over
them.

Cleaning
When the unit gets dirty, wipe it with a clean,
soft, dry cloth. If necessary, wipe it with a soft
cloth dampened with mild soapy water, then a
fresh cloth with clean water. Wipe dry immedi-
ately with a dry cloth. NEVER use benzene,
aerosol cleaners, thinner, alcohol or any other
volatile cleaning agent. Do not use abrasive
cleaners, as they may damage the finish of
metal parts. Avoid spraying insecticide near the
unit.

Moving the Unit
Before moving the unit, be certain to discon-
nect any interconnection cords with other com-
ponents and make certain that you disconnect
the unit from the AC outlet.

Important Information for the User
NOTE: This equipment has been tested and
found to comply with the limits for a Class-B
digital device, pursuant to Part 15 of the FCC
Rules. The limits are designed to provide rea-
sonable protection against harmful interference
in a residential installation. This equipment gen-
erates, uses and can radiate radio-frequency
energy and, if not installed and used in accor-
dance with the instructions, may cause harmful
interference to radio communication. However,
there is no guarantee that harmful interference
will not occur in a particular installation.
If this equipment does cause harmful interfer-
ence to radio or television reception, which can
be determined by turning the equipment off
and on, the user is encouraged to try to correct
the interference by one or more of the
following measures:

■ Reorient or relocate the receiving antenna.

■ Increase the separation between the equip-

ment and receiver.

■ Connect the equipment into an outlet on a

circuit different from that to which the
receiver is connected.

■ Consult the dealer or an experienced

radio/TV technician for help.

This device complies with Part 15 of the FCC
Rules. Operation is subject to the following two
conditions: (1) this device may not cause harm-
ful interference and (2) this device must accept
interference received, including interference that
may cause undesired operation.

NOTE: Changes or modifications may cause this
unit to fail to comply with Part 15 of the FCC
Rules and may void the user’s authority to
operate the equipment.

The carton and shipping materials used to pro-
tect your new receiver during shipment were
specially designed to cushion it from shock and
vibration. We suggest that you save the carton
and packing materials for use in shipping if you
move, or should the unit ever need repair.

To minimize the size of the carton in storage,
you may wish to flatten it. This is done by care-
fully slitting the tape seams on the bottom and
collapsing the carton down to a more two-
dimensional appearance. Other cardboard
inserts may be stored in the same manner.
Packing materials that cannot be collapsed
should be saved along with the carton in a
plastic bag.

If you do not wish to save the packaging mate-
rials, please note that the carton and other sec-
tions of the shipping protection are recyclable.
Please respect the environment and discard
those materials at a local recycling center.

5 FRONT PANEL CONTROLS

1 Main Power Switch: Press this button to
apply power to the HK 3470. When the switch is
pressed in, the unit is placed in a Standby mode,
as indicated by the Power Indicator

3 sur-

rounding the System Power Control

2. This

button MUST be pressed in to operate the unit.
To turn the unit off and prevent the use of the
remote control, this switch should be pressed
until it pops out from the front panel so that the
word “OFF” may be read at the top of the
switch.

NOTE: In normal operation this switch is left in
the “ON” position.

2 System Power Control: When the Main
Power Switch 1 is “ON,” press this button
to turn on the HK 3470; press it again to turn
the unit off. Note that the Power Indicator
3 surrounding the switch will turn green
when the unit is on.

3 Power Indicator: This LED will light in
amber when the unit is in the Standby mode to
signal that the unit is ready to be turned on.
When the unit is in operation, the indicator will
briefly turn red, and then change to green. A
red indicator during normal operation means
that the unit is in the Protect mode, and should
be turned off and then checked for a possible
speaker-wire short circuit.

4 Headphone Jack: This jack may be used to
listen to the HK 3470’s output through a pair of
headphones. Be certain that the headphones
have a standard 1⁄4" stereo phone plug.

5 Mute: Press this button to momentarily
silence the speaker output of the HK 3470.

6 Speaker 1 Button: Press this button to
turn the speakers connected to the Speaker 1
output terminals ‡ on or off.

7 Speaker 2 Button: Press this button to
turn the speakers connected to the Speaker 2
output terminals ° on or off.

VMAx

7

9 !

#

%

&

(

8

)

@ $

^

*

2

1

3

4

5

6

1 Main Power Switch
2 System Power Control
3 Power Indicator
4 Headphone Jack
5 Mute
6 Speaker 1 Selector
7 Speaker 2 Selector
8 Phono Input Selector
9 T-Mon (Tape Monitor) Input Selector

) Tuning Button
! Tape Input Selector
@ Preset Scan
# CD Input Selector
$ Aux Input Selector
% Preset Selector
^ VMAx Selector
& FM/AM Selector
* FM Mode Selector

( Sleep Button
Ó Bass Control
Ô Treble Control
 Balance Control
Ò Volume Control
Ú Volume/Mute Indicator
Û Main Information Display
Ù Speaker Selection Indicators
ı Remote Sensor Window

6 FRONT PANEL CONTROLS

8 Phono Input Selector: Press this button
to select the output of a turntable that is con-
nected to the Phono inputs §.

9 T-Mon (Tape Monitor) Input Selector:
Press this button to listen to the output of a
tape recorder connected to the Tape Monitor
inputs ª. The T-Mon indicator will light to
indicate that the input source is being moni-
tored when the HK 3470 is connected to a
three-head tape deck or another unit with off-
head playback.

) Tuning Button: Press the left side of the
button to tune lower-frequency stations and the
right side of the button to tune higher-frequency
stations. When a station with a strong signal is
tuned, the TUNED indicator will light in the
Main Information Display 

Û. A brief (1/2

second) press of the button will manually tune
to the next frequency increment, while pressing
and holding the button for a longer period will
automatically tune to the next station with a
signal strong enough for acceptable reception.

! Tape Input Selector: Press this button to
listen to the output of a tape recorder or other
device connected to the Tape 2 inputs ⁄.

@ Preset Scan: Press this button to auto-
matically scan through the stations that have
been programmed in the HK 3470’s memory.
The tuner will play five seconds of each station
before moving to the next preset station. To
stop the scan when the desired station is
heard, press the button again. (See page 15 for
more information on the tuner memory system.)

# CD Input Selector: Press this button to
listen to the output of a CD player connected to
the CD inputs ¶.

$ Aux Input Selector: Press this button to
listen to the output of a device connected to
the Aux inputs •.

% Preset Selector: Press this button to step
up or down through the list of stations that has
been entered into the preset memory. (See
page 15 for more information on tuner pro-
gramming.)

^ VMAx Selector: Press this button to
engage VMAx processing of a stereo input. The
VMAx Mode Indicator

A will light, and you

will notice a wider, more spacious sound field.
In order to obtain maximum benefit, you should

be seated midway between the two loudspeak-
ers, and the same distance from the speakers as
the speakers are from each other. The speakers
must be placed facing parallel and evenly with
each other so that their baffles are in the same
plane. Press the button again to return to
Stereo mode.

& FM/AM Selector: Press this button to
select the tuner as the input to the receiver.
When the tuner is in use, press this button to
change between the AM and FM frequency
bands.

* FM Mode Selector: Press this button to
select the Stereo or Mono mode for FM tuning.
In the STEREO mode, a Stereo indicator will
light in the Main Information Display 

Û,

and stereo reception will be provided when sta-
tions are transmitting stereo signals. In the
MONO mode, the left and right signals from
stereo broadcasts will be mixed together and
reproduced through all channels. Select MONO
for better reception of weak signals. VMAx will
have no effect in MONO mode.

( Sleep Button: Press this button to place
the unit in the Sleep mode. Each press of the
button selects the amount of time that will
remain before the unit automatically goes 
into the Standby mode, as shown in the Main
Information Display 

Û, in the following

order:

Ó Bass Control: Turn this control to modify
the low-frequency output of the left and right
channels by as much as ±10dB. Set this control
to a suitable position for your taste and room
acoustics.

Ô Treble Control: Turn this control to modify
the high-frequency output of the left and right
channels by as much as ±10dB. Set this control
to a suitable position for your taste and room
acoustics.

 Balance Control: Turn this control to
change the relative volume for the left and
right channels.

Ò Volume Control: Turn the knob clockwise
to increase volume, counterclockwise to
decrease the volume.

Ú Volume/Mute Indicator: This indicator
will glow green when the HK 3470 is turned
on. Its position will enable you to judge the
relative volume of the unit even when the
speakers are muted or turned off. When the
indicator is pointing toward the left, as in an
“8 o’clock” position, the volume is low; when 
it is pointing to the right, as in a “3 o’clock”
position, the volume is loud. When the unit has
been muted by pressing the Mute button 

5,

the indicator will flash.

Û Main Information Display: This display
delivers messages and status indications to
help you operate the receiver.

Ù Speaker Selection Indicators: These
indicators light as a green LED next to the des-
ignation for each speaker pair to show when
they are active. Press the Speaker 1

6 or

7 Selectors to activate either

pair of speakers. Both sets of speakers may be
selected simultaneously as long as all speakers
have a nominal impedance of 8 ohms or
greater. However, occasionally the actual
impedance will vary, depending upon the 
program material. If the impedance drops to a
point where there may be potential damage 
to the equipment, the HK 3470 will go into
protect mode.

ı Remote Sensor Window: The sensor
behind this window receives infrared signals
from the remote control. Aim the remote at this
area and do not block or cover it unless an
external remote sensor is installed.

90

min

80

min

70

min

60

min

50

min

40

min

30

min

20

min

10

min

OFF