Kenwood KR-7050 stereo receiver Instruction manual

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INTRODUCTION
You are no doubt anxious to hook up your
new receiver and settle back to hear the object of
your purchase — superior sound. To this end, let
us help you to integrate the receiver into your
system. Take the time to read through this
manual carefully. Knowing how to set up your
receiver to best advantage will enhance your
listening pleasure right from the start. You will
also become aware of the ease with which you
can adjust your receiver to meet your special re-
quirements.
FOR YOUR RECORDS
Record the serial number, found on the back
of the unit, in the spaces designated on the
warranty card, and in the space provided below.
Refer to the model and serial numbers whenever
you call upon your Kenwood dealer for informa-
tion or service on this product.
Model KR-7050 Serial number
UNPACKING
Unpack the unit carefully and make sure that
all accessories and FM indoor antenna are put
aside so they will not be lost.
Examine the unit for any possibility of
shipping damage. |If your unit is damaged or fails
to operate, notify your dealer immediately. |f your
unit was shipped to you directly, notify the
shipping company without delay. Only the
consignee (the person or company receiving the
unit) can file a claim against the carrier for
shipping damage.
We recommend that you retain the original
carton and packing materials for use should you
transport or ship the unit in the future.
INSTALLATION PRECAUTIONS
a) Avoid locations subject to direct sunlight.
b) Avoid high or low temperature extremes.
c) Keep the receiver away from heat-radiating
sources.
d) Make sure power is off before making any
system connections.
WARNING :
TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE
THIS APPLIANCE TO RAIN OR
MOISTURE.
2 KR-7050(K)
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AC VOLTAGE SELECTION
This unit operates on 120 volts, 220 volts or
240 volts AC. The AC Voltage Selector Switch is
set to the AC voltage generally available in the
country where it is shipped. Before connecting
the power cord to your AC outlet, make sure that
the setting position of this switch matches your
AC line voltage. If not, it must be properly
changed in accordance with the directions below.
Our warranty does not cover damage caused by excessive
line voitage due to improper setting of the AC Voltage
Selector Switch.
Stopper Ne 7
AL T20V~ / L #
Setting =
AC 220V =
Setting
АС 240у > о E |
Setting NE Ee 7
1 Remove screw and stopper plate.
2 Shde lever to your line voltage.
3 Lock lever with stopper plate
and screw.
AC Voltage Selector Switch
CONTENTS
I eo o fC EF
SAFETY PRECAUTIONS .... ener rie 3
SYSTEM PLANNING CONSIDERATIONS AND FEATURES ....... 4
SYSTEM CONNECTION DIAGRAM... ааа оаанение, 5
SYSTEM CONNECTIONS o.oo aiii 5
CONTROLS, INDICATORS AND CONNECTORS... 10
OPERATING INSTRUCTIONS... ani 12 |
IN CASE OF DIFFICULTY 11 Le 14 /
SPECIFICATIONS........ A A aaa aaa rar iaa. 16
CLEANING
Do not use volatile solvents such as alcohol,
paint thinner, gasoline, benzine, etc. to clean the
cabinet. Use a silicone cloth or a clean dry cloth.
VENTILATION HOLES
The case top Is slotted to allow ventilation.
Never block these holes with ornamental cloths,
books or other objects. Make sure that metal
objects such as coins, hairpins or needles do not
enter the unit through the ventilation holes. The
result could be a serious malfunction or a possible
shock hazard. Make sure that children do not
insert foreign objects into the ventilation holes.
MODIFICATIONS AND SERVICE
Each unit is shipped after it has been
carefully adjusted and tested to provide optimum
performance. The unit must not be modified
internally. Unauthorized modifications will void
the terms of the warranty. High voltages are used
in some of the internal circuits. Therefore, do not
remove the cabinet or touch internal parts. Refer
all service to qualified service personnel.
POWER CORD
Always insert or remove the power plug
from the AC outlet by grasping the plug body.
Never pull or stretch the cord. Take care that the
cord is not subject to traffic or bent sharply around
furniture. Keep heavy objects off the cord; never
route It under rugs, and avoid the use of extra ex-
tension cords. Attention to these precautions will
avoid fire or shock hazards.
ACOUSTIC FEEDBACK
Occasionally a disturbing howling sound
caused by acoustic feedback, may be heard. This
IS generally caused by the relative positions of the
turntable and speaker enclosures. The sound
pressure radiated from the speaker surrounds and
vibrates the turntable
This vibration is picked up by the cartridge,
sent to the unit as an electrical signal, and
returned to the speaker. This again causes the
speakers to radiate vibration which induces
sympathetic vibrations in the turntable and
cartridge. Sympathetic vibrations are reinforced
with each repeating cycle and result in an
undesirable sound called oscillation or “howling”.
To prevent it, keep your turntable away from your
speakers. Also, mounting your turntable on
shock-absorbing pads may help.
SPEAKER-SYSTEM PROTECTION
Your KR-7050 is capable of supplying very
high power to your speakers. To prevent speaker
damage due to accidental surges, such as may be
caused by inadvertently dropping the stylus onto a
record, make it a habit to reduce volume before
changing records, switching between program
sources or turning power ON.
Check the power-handling ability of your
speakers and make sure that the power supplied is
within their limits. Excessive power can
permanently damage your speakers.
KR-7050(K) 3
4
1.
Thick curtains shut out direct sun-
light.
H a a % 1 ad к. L a Г E = |
KR-7050
© Do not permit curtains, table
cloths, books of other materials to
block the ventilation holes.
Speaker System
© “Speakers placed in front of a hard
surface such as a wall, will
generate more bass response.
For best stereo reproduction. both
speakers should work into the
same acoustic condrtions.
—| Turntables
o Protect from vibration and close
dust cover whenever possible.
e Store records vertically and
protect from dust and dirt.
Tape Decks
o Be sure to install reel clamps
when using vertically.
Always keep heads clean.
© Do not neglect recorded tape for
long periods.
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Lo — || —
© Avoid magnetic fields.
Carpets
Absorb sound
(Placing in front of speakers is also
effective.)
© Furniture materials can improve
tone.
© For better sound, install curtains
or drapes on the wall opposite the
speakers.
© The best listening position is on a
FEATUF
High-speed amplifiers afford outstanding
transient response: slew rate 200 volts per
microsecond, rise time 0.9 microseconds.
DC coupling throughout the audio amplifier
section assures flat frequency response down
to DC (zero Hz) to provide ‘superior phase
response at the low frequency range of
human hearing.
Sophisticated equalizer using FETs and
single-ended push-pull output provides preci-
sion phono equalization and high signal-to-
noise ratio.
Professional instrumentation. Four il-
luminated meters provide read out of peak
power from both stereo channels, antenna
signal strength, and FM center-channel tun-
ing.
KR-70501K)
8.
9.
line perpendicular to the center of
a line drawn between the two
speakers.
RES
Highly sensitive front end features dual-gate
MOS FETs for protection against the effects
of signal overload.
Wide and Narrow IF band selection for
superior FM performance under difficult
reception conditions.
Pilot-signal canceller circuit for best high-
frequency sound from stereo FIVl broadcasts.
Facilities for operation with two tape decks.
Operating convenience from facilities for:
dual speaker systems, subsonic and high
filters, FM muting, loudness control, de-
emphasis selection.
FM OUTDOOR ANTENNA
DIRECTION
OF STAT ION
FV INDOOR ANTENNA
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300% feeder
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ANTENNA
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7/50
coaxial
cable
AM FERRITE
BAR ANTENNA
E O O A o SE e =
TAPE 0
REC PLAY a
Me e E TAFE Ey
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| SPEAKER SYSTEM B
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| AC VOLTAGE
SELECTOR SWITCH
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bar antenna.
To AC OUTLET
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TURNTABLE TAPE DECK B
LINE OUT
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8360000 06
TAPE DECK A SPEAKER SYSTEM A
KR-7050(K) 5
SPEAKERS
If only one set of speakers is to be
connected, make connections to the terminals
marked SPEAKERS A, as shown on page 5.
Connect the speakers to the and | В terminals
in accordance with the location selected for each
speaker. To ensure correct speaker phasing,
observe polarity marks; connect terminals marked
+ on the receiver to similarly-marked speaker
terminals. Do the same for receiver and speaker
terminals marked with a minus sign. Reversal of
speaker leads will result in loss of bass tones and
poor stereo separation.
If a second set of speakers is to be used,
make connections at the right set of terminals,
marked B.
It should be noted that pairs of speakers
must be connected to SPEAKERS terminals A and
B, if sound is to be heard when the SPEAKERS
switch is set to the A + B position. In this setting
the speakers connected to the A and B terminals
are put in series. Therefore, if there are no
speakers connected to the B terminals, no sound
will be heard from the A speakers when the
SPEAKERS switch is set to A + B.
When connecting the speaker leads to the
speaker terminals, make sure that the bare wire
strands at the ends of the speaker leads do not
touch the adjacent terminal.
It is recommended that the tips of the
speaker leads be soldered, or the strands of
individual leads be twisted together to eliminate
any possibility of short-circuits forming in the
speaker connecting network.
Note:
Speaker impedance must be 4-ohms or more if only one set
of speakers is to be connected or when a pair is connected
to both the A and 8 terminals.
TURNTABLES
Your stereo turntable has two audio cables
that are terminated with phono plugs. Plug the
left channel plug into the [L] and the right channel
plug into the [R] PHONO INPUT jacks as shown
on page 5.
If the turntable has a ground wire, connect it
to the units GND terminal to avoid hum.
6 KR-7050(K)
y (1) Remove insulation
2 — from lead end.
SPEAKER LEAD TIPS
Tighten the
Insert the
Loosen the
screw wire screw
Speaker Lead Connection
TAPE DECKS
if only one tape deck is to be connected to
the system it is recommended that it be connected
to the jacks marked TAPE A.
Tape deck input and output cables are
normally terminated with phono plugs.
Playback
Plug the left and right output cables of the
tape deck into the and [R] TAPE A PLAY jacks.
Record
Plug the left and right input cables of the
tape deck into the [L| and [R| TAPE A REC jacks.
DIN Connector
If your tape deck is equipped with a DIN
connector, connect it to the TAPE B REC/PLAY
connector with the DIN connecting cord. The DIN
connection makes both input and output
connections with a single cord, and the signal
must be controlled with the TAPE B switch on the
front panel.
Note: — ————;s]————]]P re ——]]]—]—£.———] вы
If connections are made with a DIN connecting cord, the
Second Tape Deck
Plug the input and output cables from the
second tape deck into the REC and PLAY jacks
marked TAPE B.
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AUX JACK:
\
INPUT AUX jacks are used to connect other
nigh-level signal sources, such as tuners, extra
tape decks (equipped with preamps), TV or VTR
sound output, mic preamps, etc.
FIVE ANTENNA
Your KR-7050 approaches the theoretical
limit in FM sensitivity. However, the performance
of your system is determined to a very large extent
upon the signal conditions where the antenna Is
placed. The reason Is that FM broadcast signals
travel in straight paths. Therefore they can be
blocked by natural or man-made obstructions
such as mountains, hills, or buildings. At large
distances from the transmitter the curvature of the
earth acts as a screen between transmitter and
receiver.
Consider the signal conditions in planning
vour installation. If you live in or near an urban
area the indoor antenna (supplied) may serve your
needs adequately. However, If favorite stations
are weak due to natural obstructions, or if you live
in a building which is made of steel-reinforced
concrete (which acts as a shield) it may be
necessary to install a good outdoor antenna.
Mountain В
> o ci E =
pA e” E
- EN Weakened Signal
Building
SUOMNY Ny
Signal
Direct Wave and Reflected Wave
FM Indoor Antenna
Connect the T-shaped indoor antenna
(supplied) to the 3002 FM ANTENNA terminals as
shown in the SYSTEM CONNECTION DIAGRAM.
Spread the two arms that form the top of the “T”
horizontally and hold them against convenient
wall surfaces. Try several locations for best
results on your favorite stations. Tape the
antenna in place where the best compromise is
found between listening results and appearance.
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ERA Outdoor Antennas
Consult with your dealer or service man
about the best method of selecting and installing
an outdoor FM antenna. The choice of lead-in
(feeder) wire 15 also important. The flat
ribbon-shaped twin lead performs well electrically,
s cheaper and 15 somewhat easier to handle in
routing through windows and around rooms.
Coaxial cable is more expensive, does a much
better job of minimizing Interference, is less prone
to the effects of weather and close-by metal
objects, and is nearly as good a signal conductor
as the ribbon type wire. The latter is particularly
true of foam-type coaxial cables. Coaxial cable is
somewhat more difficult to install at the point
where the cable enters the building. If coaxial
cable is selected, make sure the antenna Is
designed to drive that type of cable. In many
cases a matching transformer (balun) must be
used to connect the antenna terminals to the
coaxial cable.
7
DI More than 2 meters |
ignition ~~ \ (6.6 feet) above metal
noise > Mic roof.
ISSN \
DD AAs More than 4 meters
N S NN (13 feet) above the
ground.
© To minimize auto-ignition noise, locate the antenna
as far from heavy traffic as possible.
® Keep the feeder or coaxial cable as short as
possible. Do not bundle or roll up excess cable.
© The antenna should be at least two meters (6.6
feet) from reinforced concrete walls, or metal
structures.
FM Outdoor Antenna Installation
KR-7050(K) 7
Lead-In Connections at the Receiver AM ANTENNA
To connect 300% ribbon type cable, cut the AM Bar Antenna
ribbon down the center of the insulation about 60 Tune in your favorite AM station and
mm (2-3/8 inches) to separate the two wires. position the ferrite-bar antenna for best reception.
Strip the plastic insulation from the wire ends for Try other stations and find the position that gives
about 10 mm (3/8 inch) and connect to the 300 best overall reception.
FM ANTENNA terminals as shown for the 300
feeder connection.
| 3007 feeder
_——— —— —
——— ANTENNA
FM 750
i
Ae
| | — © © “ Keep the AM ferrite bar
| E antenna away from the
\ e O) rear panel.
a AM Antenna Setting
300% Feeder Connection
AM Outdoor Antenna
To connect 75 coaxial cable, strip the outer In most cases the very sensitive ferrite-bar
plastic jacket off the cable for a length of 23 mm antenna will provide excellent results. However,
(15/16 inch). Follow the steps in the drawing. in steel buildings or at a great distance from the
transmitter, it may be necessary to install an
outside long-wire antenna. The end of this wire
E or outer should be stripped of insulation and connected to
(+) (Braid) the AM terminals as shown on page 5.
GROUND
For maximum safety and minimum in-
terference connect the GND terminal to a good
earth ground if practicable. A good earth ground
Is a cold water pipe or a metal stake driven into
moist earth.
ANTENNA MA 3 = ZA
FM 7 J a ; rr eT re
DE-EMPHASIS SWITCH (Bottom Plate)
Before shipment this switch has been set to
the appropriate setting for the expected delivery
area.
Strip the coaxial cable as shown in (Al. An incorrect setting will adversely affect
Loosen the as and connect the cable high frequency response of FM reception. Check
as shown in o
Then tighten all teminals for a connection as for the correct setting before putting the unit into
shown in (C). operation.
75% Coaxial Cable Connection U.S.A. and U.S. Military ..............cc.......... 75 us
Note: —— —
Do not make connections to 300% and 750 terminals
simultaneously.
The front-panel FM 25us switch alters de-emphasis for use
with Dolby* FM broadcasts. See page 11.
* Dolby is the trademark of Dolby Laboratories
8 KA-70501K)
DOLBY ADAPTORS
A Dolby Noise-Reduction adaptor may be
connecied to the TAPE A or B jacks in place of a
tape deck to facilitate noise reduction on FM
broadcasts that feature Dolbv operation.
1. Connect the Dolby NR adaptor to TAPE jacks
A or B as shown in the figure.
TAPE A (or B)
REC PLAY
QA E
Q Qe
a
IN OUT J
== CES TE
———— D `—@ 5) в
DOLBY NR ADAPTOR
2. Set the SELECTOR to FM and tune in the
station that Is transmitting Dolby-corrected
audio.
3. Set the appropriate TAPE switch (B if you
have connected the adaptor to the B jacks) to
PLAY.
4. Press in the FM 25us button on the front
panel. (Remember to reset this button, press
again to make it pop out, when Dolby Noise
Reduction is not in use.)
AC OUTLETS
The AC outlets on the rear panel of the unit
mav be used to supply power to other
componenis in the system, such as a turntable,
tape deck, etc. Never connect equipment whose
power consumption exceeds the maximum value
shown at each outlet.
1. SWITCHED outlet: This outlet supply power
only when the KR-7050 is turned on.
lts maximum capacity is 100 watts.
2. UNSWITCHED outlets: These outlets
provides power when the unit is plugged into
an active AC wall outlet, regardless of the
setting of the POWER switch. Their max-
Imum total capacity is 200 watts.
CONNECTION PRECAUTIONS
Be sure that connector plugs are firmly in-
serted Into their respective jacks. Poor connec-
tions may cause no sound output. They may also
generate noise.
Do not bunch antenna feeder lines and inter-
connecting cords together with the AC line or
speaker cords. Doing so can cause interference,
and also may adversely affect sound quality.
KR-7050(K) 9
АСС кое FOE
1) POWER switch
ON — Turns the receiver on.
OFF — Turns the receiver off.
(2) SPEAKER switch
OFF — This position silences all speakers to permit private
use of headphones.
A — Activates speakers connected to the SPEAKERS A ter-
minals on the rear panel.
B — Activates speakers connected to the SPEAKERS B ter-
minals on the rear panel.
A + B — Activates speakers connected to the SPEAKERS A
and B terminals simultaneously.
3) LOUDNESS switch
ON — Bass notes are boosted at low listening levels. This
precisely offsets the characteristics of human hearing
whereby we are less sensitivity to bass notes at very
low listening levels.
OFF — The low-level bass boost is removed and the
VOLUME control provides flat response at all settings.
4) DC COUPLED switch
Switch ON to obtain DC (direct) coupling through all
amplifier circuits from the Tape and Aux inputs to the
speaker terminals. A single coupling capacitor is inserted
into the chain for Phono operation only. This provides a
totally flat response for low frequency tones. The DC
equalizer and DC power amplifier chains are in use for
Phono operation, but the input circuits are AC coupled.
(Magnetic phono cartridges do not respond to DC or static
values).
With the switch set to OFF, a single coupling capacitor 1s in-
serted into the Tape and Aux inputs. This capacitor is also
put into the Phono chain for a total of two capacitors. When
DC COUPLED is turned OFF, frequencies below 18 Hz are
attenuated at the rate of 6 dB per octave. This provides
filtering of subsonic signals and is useful in reducing turn-
table rumble or the effects of warped records. Always
10 KR-70501K)
Hii
Fo
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switch to OFF if you suspect a DC leak from your signal
source. Such a leak will result in a steady displacement of
your speaker cones if the DC COUPLED switch remains on.
© HIGH FILTER switch
Pressing this button in (latched) reduces signals above 5 kHz
at the rate of 6 dB per octave. Press this button in to lessen
the effects of tape hiss, record scratch, etc. Press to unlatch
(button out) in all other cases.
© POWER meters
The POWER meters show the effective power being
delivered to your speakers. Unlike conventional VU meters
these power meters respond instaneously to rapid changes
in music level and follow andante and crescendo passages
to provide a true indication of the effective power your
speakers are handling at all times. A logarithmic compres-
sion circuit permits a wide range of readings, from 0.01 W to
160 W without the need of range switching. The meters are
calibrated for an 8-ohm load. If 4-ohm speakers are used,
multiply the reading by 2; for 16-ohm speakers, divide the
reading by 2.
7 INDICATOR lamps
Indicators marked AM, FM, PHONO, MIC and AUX light to
show the mode selected by the SELECTOR switch.
SIGNAL meter
This meter indicates the strength of AM or FM signals
received. It is used as a tuning aid for both AM and FM tun-
ing and very useful in making antenna adjustments.
9) TUNING meter
This meter gives a precise indication of correct FM tuning.
Maximum stereo separation and minimum distortion are ob-
tained when the receiver is tuned to center the pointer on
the meter scale.
STEREO indicator
The STEREO indicator lights while the MODE switch is set
to STEREO and FM stereo broadcast is received.
0D FM 2Bus (De-emphasis) switch
Selects a 2bus de-emphasis value for correct frequency
response with Dolby FM broadcasis. A Dolby decoder must
be added to the system, as shown on page Y. Press in when
the selected FM station transmits Dolbv-corrected recor-
dings. Press again to release for all other operating modes.
y FM MUTING switen
This switch silences interstation noise on the FM hand, but it
may also eliminate the signal of a weak and distant station
along with the interstation noise. Therefore, set this switch
to OFF (bv pressing button release) for reception of weak
and distant stations.
13) IF BAND selector
WIDE — For normal use and minimum distortion.
NARROW — If a very strong adjacent channel interferes
with a desired weak channel.
(y TUNING knob
AM and FM stations are selected by turning this knob.
15% PHONES jack
Stereo headphones are plugged into this jack.
o TONE switch
In the DEFEAT position the TONE controls are bypassed and
a frequency response is flat. In the ON position the TONE
controls are activated.
i) TONE controls
The BASS, MID and TREBLE controls adjust bass, mid-
range and treble response. Each lever controls both left and
right channels equally. Moving the levers up increases bass,
mid-range and treble response, and down decreases bass,
mid-range and treble response. You can select the bass and
treble TURNOVER frequencies (80 Hz, 140 Hz, 250 Hz, 450
Hz or 800 Hz for bass control, 800 Hz, 1.4 kHz, 2.5 kHz, 4.5
kHz or 8 kHz for treble control) with the TURNOVER
switches.
Since both frequency and level can be controlled in-
dependently, quite pricise adjustments are possible to suit
the acoustic conditions of your listening room and speakers.
1» BALANCE control
This control permits balancing of left and right channels
when an imbalance exits from the sound source, or to cor-
rect acoustic imbalance due to room conditions. Turn it to
the left from the zero position to boost the left channel; turn
It to the right of zero to raise the level of the right channel.
(9 VOLUME control
This control adjusts left - and right - channel volume
simultaneously. Set it for the desired listening level. The
scale is provided with dB graduations to indicate attenuation
when maximum output level conrresponds to O dB.
250 MODE switch
STEREO — This provides stereophonic reproduction from
any stereo program source. The left channel is heard
from the left speaker, and the right channel is heard
from the right speaker.
MONO — Monophonic reproduction. The leit and right
channels are mixed together and heard from both
speakers.
2) TAPE switches
A, B SQURCE — The signal applied to the record terminals
of the tape deck is heard.
A PLAY — To monitor a recording In progress or to play
back a tape from a tape deck connected to the TAPE A
jacks.
B PLAY — To monitor a recording in progress or to play
back a tape from a tape deck connected to the TAPE B
Jacks.
A, B PLAY — Dubbing is made from a tape deck connected
to the TAPE B jacks to a tape deck connected to the
TAPE A jacks. The recording condition in the tape
deck A is automatically monitored.
Note: _ —
Be sure to set both TAPE switches to "SOURCE" when not
operating the tape deck(s).
2) SELECTOR switch
AM — for reception of AM broadcasts.
FM — for reception of FM broadcasts.
PHONO — Audio from turntables connected to the PHONO
input jacks.
MIC — Audio from a source connected to the MIC jack is
heard.
AUX — Audio from a source connected to the AUX jacks Is
heard.
2) MIC jack
Plug a high-impedance microphone into this jack
(monophonic sound only).
KR-7050(K) 11
The POWER switch sould be turned on
after all knob settings have been made. Buttons out.
Set to O.
Buttons out. Set to the desired source.
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To correct setting for speakers to be Set to O.
driven: A,B,A+B.
BEFORE APPLYING POWER
Set all operating controls as shown above
before applying power for the first time.
FM RECEPTION
1. Set the SELECTOR switch to “FM”.
2. Turn the tuning knob to place the dial pointer
at the desired channel frequency. Fine tune
first for a maximum reading on the SIGNAL
meter then tune carefully to center the
pointer on the TUNING meter.
2 3
0 ) 5
D LL \
SIGNAL Y TUN
3. Adjust volume and tone controls for your
perference.
ABNORMAL CONDITIONS
1. If a station does not appear at the correct
tuning spot on the dial, set MODE switch to
“MONO”. If the station is then heard it is ex-
ceptionally weak and the MODE switch must
remain in “MONO” for that channel unless
some effort is made in the antenna system
to raise signal.
2. If the desired channel is interfered with from
a very strong nearby channel, set the IF
BAND selector to NARROW.
3. When the IF BAND selector is switched from
WIDE to NARROW, meter deflection in-
creases. This is a normal result of the change
in IF circuitry.
Tune the receiver once again for distortion-
free reception while observing the TUNING
meter.
12 KR-7050(K)
Set to =. Set to STEREO. Set to SOURCE.
AM RECEPTION
1. Set the SELECTOR switch to AM.
2. Turn the TUNING knob to the desired
station. Make fine tuning adjustments by
observing the SIGNAL meter and tuning for
maximum pointer deflection (to the right).
9 3
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3. Adjust volume and tone for your preference.
TAPE DECKS
Tape Playback
1. Set the appropriate TAPE switch (A or B) to
PLAY to select output from a tape deck con-
nected to the Tape A or B jacks. (The setting
of the SELECTOR switch affects speaker out-
put only when both TAPE switches are set to
SOURCE.)
2. Operate the tape deck.
3. Adjust volume and tone for your preference.
Monitoring
If tape deck 1$ equipped with three heads,
you can compare the sound quality of the
recording in progress with that of the source
material by switching the appropriate TAPE
switch between SOURCE and PLAY while the
recording is being made.
Recording (one tape deck)
1. Set the SELECTOR switch to the desired
program source. Both TAPE switches may
be set to SOURCE. However, to monitor the
output signal of your tape deck while the
recording is in progress, set the appropriate
TAPE switch to PLAY.
2. Set up your tape deck for recording and set
recording levels with the controls on your
tape deck. The volume, filter and tone
controls on the receiver do not affect the
signal applied to the tape deck for recording
purposes.
3. Adjust listening level and tone at the receiver
for your preference in monitorning the signal;
these settings will not affect the recording.
Recording (two tape decks)
1. Set the SELECTOR switch to the desired
program source.
2. Recordings can now be made on both tape
decks simultaneously.
To monitor the recording, set the TAPE A
switch to PLAY, keeping the TAPE B switch
at SOURCE. It is impossible to monitor the
recording in tape deck B when recording with
two tape decks.
3. Recording levels should be set using the
controls on the individual tape decks.
Tape-To-Tape Dubbing (Duplicating)
Tape-to-tape dubbing can be easily done
with two tape decks. The recorded tape should be
loaded on tape deck B, and a blank tape for recor-
ding, on tape deck A. This is because the dubbing
in the unit is available only from tape deck B to
Mots: ——
The setting of the SELECTOR switch does not affect this
operation. Adjust record levels on the deck that is making
the copy using that deck'‘s operating controls.
TURNTABLES
|. Set the SELECTOR switch to PHONO.
2. Operate the turntable.
3. Adjust volume and tone controls for your
preference.
MICROPHONES
1. Plug a high-impedance microphone into the
MIC jack (monophonic microphones only).
2. Turn VOLUME all the way down and set the
SELECTOR to MIC.
3. Advance VOLUME to the desired level, but
keep the microphone away from the speakers
to avoid “howling” due to acoustic feedback.
4. Microphone recordings may be made by
following the RECORDING instructions given
earlier.
AUX
1. Set the SELECTOR switch to AUX.
2. Operate the component or accessory
connected to the AUX jacks.
3. Adjust volume and tone controls for your
tape deck A. preference.
1. Set both TAPE switches to "PLAY".
2. Operate both tape decks together. Record
ing in tape deck A is automatically
monitored.
B - - -
SOURCE SOURCE TAPE B TAPE A SPEAKERS
RECORDING >
PLAY
SOURCE TAPE B TAPE A
PLAYBACK
SOURCE
PLAYBACK
PLAY PLAY
SOURCE SOURCE TAPE B TAPE A
DUBBING J ; -> E uu
DUBBING TOR
PLAY PLAY " ;
TAPE
Tape Monitor Switch Position and Source Signal
иен — = EEE eel
KR-7050(K} 13
If your receiver should not perform as expected,
consult the table below to see If the problem can
be corrected before seeking help from your
Kenwood dealer or service representative.
AM, FM, PHONO or Tape playback
CAUSE
REMEDY
m— EEE ЦЕЩН =
Meters lights out, no sound,
power on.
No sound from left or right.
Sound from left or right,
but not both.
volume is adjusted immediately after.
Phono level differs from
FM or AM level
a) Power cord not plugged in.
b) Poor connection at wall outlet.
Power outlet inactive.
a) SPEAKER switch set to A+ B.
b) Speaker cords disconnected.
c) SPEAKERS switched off.
d) Volume control fully CCW.
e) Tape switches set to PLAY.
a) Poor speaker connections.
b) Defective speaker.
c) BALANCE set to one extreme
or the other.
Er Be ==
Insufficient warmup.
Low or high output from
phono cartridge.
a} Check plug contact.
b) Check outlet using a lamp or
other appliance (outlet may be
controlled by a wall switch).
a) Speakers must be connected
to both A and B terminals;
see page 6.
b) Check speaker connections.
c) Check SPEAKERS switch.
d) Adjust volume.
e) Set to SOURCE except when
tape decks are in use.
a) Check connections at both ends
of speaker cord.
b) Reverse speakers, if problem stays with
speaker have speaker checked.
c) Check setting of BALANCE control.
Allow 2-3 seconds for warmup
before adjusting volume
May be normal; adjust volume
accordingly.
Par — ms a
Occurs during AM reception only
Continuous low-frequency buzz. Most
noticeable on weak stations
or at night.
High-frequency whistle especially
at night.
Intermittent buzz or crackling sound.
14 KR-7050(K)
Occurs During FM Reception only
Continuous hiss or buzzing with
broadcast
Occasional sharp rhythmic crackling
noise.
No sound on weak stations
Poor high-frequency response.
Interference from fluorescent lamps,
lamp dimmers, other appliances.
a) Interference from TV set.
b) Beat from adjacent AM station.
a) Lightning
b) Fluorescent lamps starting.
c) Appliance or furnance starting.
CAUSE
Weak antenna signal
Ignition interference from autos.
Signal too weak to overcome muting.
FM 25us switch ON.
REMEDY
Turn off fluorescent lamps or lamp dimmer
(Interference may come from neighbors lan
Try AM outdoor antenna and good ground
at GND connections. This problem may be
impossible to remove altogether
a) Turn off TV set, if problem disappears
try relocating TV set.
b) Impossible to eliminate, but try HIGH
filter.
a) No remedy.
b) Try reversing AC plug.
с) Try reversing AC plug.
REMEDY
Install outdoor antenna.
Locate outdoor antenna as far from
road as possible, use coaxial
feeder cable.
Switch MODE to MONO.
Install outdoor antenna and orient
for highest reading on SIGNAL meter.
Switch should be OFF (out) except
for Dolby broadcasts.
PHONO Playback only CAUSE PEMEDY
No sound from both or one speaker. Turntable output disconnected.
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Loud hum drowns out sound.
Falls wef! wim ll a“ nl we ow ШС
Poor ground connection at phono-
cable connections.
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Low background hum. a) Hum picked up in turntable or
turntable cables.
b) Turntable not grounded.
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TC TEETER a ER FTE = ue RE ml E Na: Fa 7 vr mr Te Ta rs on a aa nie "| emi a ml Hi — = oe mm = ——] —— el] = —
le ————_
TV signal picked up by phono cable.
(especially near transmitter).
Background buzz.
Acoustic pickup from speaker.
Howling noise at maximum
volume settings.
ss a E EC EH E
Check phono cables.
Check phono plugs, particularly
outer-shell connections.
lu HS a o Ш E i a = FE em me
A o a EEG OY ETE, TEE TE TE"
a) Keep cables away from power cords.
Twist left and right cables together.
b) Reverse AC plug of turntable.
Connect ground wire between turn-
table and GND connector.
EE eet ZZ
Route phono cables to minimize buzz.
Increase distance between speaker and
turntable. Choose speaker locations
carefully. Check turntable suspension,
DC COUPLED
>5
O 50. 7815 FM25us > 7 BAND
Г | STEREO dy ,7 C9S3 S2 S2:iFM 2ous
FM ANT. | EF xe | INDICATOR S 3 : De-emphasis Select.
1 4/2vC C.F FAMP — JL L.RF AF AMP Tr.MUTE S4:FM MUTING
EM 5) Г Гас, — Ss: INPUT SELECTOR
FRONT IF 1 MPX ZH > Shi S 6: TAPE В
— FM MUTE S 8 : MODE
— SS y FET Sa | Se:HIGH FILTER
— Tr MUTE T | T 510: DC COUPLED
| A! gr [ ‘ S11: LOUDNESS
AR | © AM | — hh + | CONTROL CIRCUIT 212: TONE DEFEAT
| | L 13: TURNOVER(BASS)
| SIGNAL TUNING | S14: TURNOVER (TREBLE) |
a ETA S15: SPEAKER SELECTOR
7 TAPEB TAPE A MODE HIGH SUB VOL BAL
+ DI—CI— a
56 S7 Se Ia Io S12
TONE DEFEAT |
" BUFF. AMP TONE AMP
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/
| | | POWER AMP
S11
LOUDNESS TURNOVER
S15 A
1 он _ SPEAKERS
DC COUPLED >
HIGH SPEED | |
— — | PHONES
METER AMP POWER METER
KR-7050(K} 15
AMPLIFIER SECTION
Power Output
80 watts* per channel, minimum RMS, both
channels driven at 8 ohms from 20 Hz to
20,000 Hz with no more than 0.02% total
harmonic distortion.
Both Channels Driven
into 82 at 1,000 Hz............. 85W + 85W
into 42 at 1,000 Hz............. 100W + 100W
Dynamic Power Qutput......... . 360W at 4%
Total Harmonic Distortion
(20 Hz to 20,000 Hz from AUX)
rated power into 80 ............. 0.02%
1W power into 8 ............... 0.007%
Intermoduration Distortion
(60 Hz: 7 kHz = 4 : 1 SMPTE)
rated power into 8% ............. 0.007%
1W power into 8 ............... 0.009%
Slew Rate ..............._..—eeo ce +200 V/usec
Rise TiMe 0.9 usec
Damping Factor
(20 Hz — 20 kHz at 81) ...... . 100
Input Sensitivity/Impedance
Phono....................ereerererece 2.5 mV/50 k%
AUX and TAPE een 200 mV/50 kf
MIC ieee, 3.6 mV/50 kQ
Signal to Noise Ratio
(A weighted)
Phono..........ccooooiiiiiiil, 85 dB for 2.5 mV input
91 dB for 5.0 mV input
AUX and TAPE ................. ... 108 dB for 200 mV input
VE 72 dB for 2.2 mV input
Maximum Phono Input Level
at 1,000 Hz....................ce ll. 200 mV (rms), THD 0.02%
Frequency Response
PHONO RIAA
Standard Curve .................... 20 Hz to 20,000 Hz +0.2 dB
AUX and TAPE .................... DC to 320 kHz —3 dB
Tone Control
Bass (at 250 Hz).................. +12 dB at 50 Hz
7: ee +10 dB at 800 Hz
Treble (at 2.5 kHz)............... +12 dB at 15 kHz
Loudness Control
(VOL. —30 dB) ................... . +10 dB at 100 Hz
Subsonic Filter ....................... 18 Hz 6 dB/oct
High Filter.............................. 5 kHz 6 dB/oct
Output Level/Impedance
TAPE REC Out (Pin)............ 200 т\//3009
TAPE REC Out (DIN) .......... 30 mV/80 kf?
FM TUNER SECTION
Usable Sensitivity................... 10.3 dBf (1.8 uV)
50 dB Quieting Sensitivity
MOnO 16.1 dBf (3.5 uV)
Stereo ............... 2 _eeererecci ce. 37.9 dBf (43 uv)
Signal to Noise Ratio at 65 dBf
Stereo ............———eceeiceerrerenao 75 dB
77 dB at 10 mV input
Total Harmonic Distortion
MONO... creas 0.08%
Stereo ..….….….….….........ussssenssanen anne 0.09%
Frequency Response .............. 30 Hz to 15,000 Hz + 0.5.
— 1.0 dB
Capture Ratio......................... 1.0 dB
Image Rejection Ratio ........... 83 dB
Spurious Response Ratio ....... 100 de
IF Response Ratio ................. 105 dB
Alternate Channel Selectivity
WIDE a, 30 dB at 300 kHz
NARROW. er... 60 dB at 300 kHz
AM Suppression Ratio........... 65 dB
Stereo Separation Ratio......... 50 dB at 1,000 Hz
40 dB at 50 Hz to 10,000 Hz
Subcarrier Product Ratio........ 70 dB
Antenna Impedance............... 30012 Balanced and ,
75% unbalanced
EM Frequency Range........... .. 88 MHz to 108 MHz
AM TUNER SECTION
Usable Sensitivity................... 10 uV (250 4V/m)
Signal to Noise Ratio............. 52 dB
Image Rejection..................... 50 dB
SeleCtiVitYy 50 dB
GENERAL
Power Consumption............... 5.3A (UL and CSA)
600W (IEC)
370W (rated power at 812)
45W (non signal)
AC Outlet... Switched 1, Unswitched 1
Dimensions ...............ereerecem.. W: 546 mm (21-1/2")
H: 172 mm (6-3/4”)
D: 411 mm (16-3/16”)
Weight (Net) 15 kg {33 Ibs)
(Gross) ....................... 17.2 kg (37.9 165}
* Measured pursuant to Federal Trade Commission's Trade Regulation
rule on Power Output Claims for Amplifier in U.S.A.
Note: _ - — ——dÚ——l]——]] es ————
Kenwood follows a policy of continuous advancements in development.
For this reason specifications may be changed without notice.
PRINTED IN JAPAN B50-1859-00 (K,U) (G)
45/949 77890N/950 D12345/051 67890N/052 D12345/153 67890N/154