Kenwood KA-5200 User manual

3 TEREO RE
K
R52
CEIVER
INSTRUCTION
MANUAL

To the New KR-5200 Receiver Owner:
Because Kenwood Electronics, [nc., takes great pride in the long tradition of quality
components
the
name
Kenwood
represents,
your
purchase
of
a
Kenwood
receiver
places
you
in
a
distinguished
family
of
connoisseurs
of
superb
high-fidelity
sound
reproduction.
The
purpose
of
this
manual
is
to
acquaint
you
with
the
operating
features
of
your
new
receiver.
You
will
notice
that
in
every
detail
of
planning,
engineering,
styling,
operating
convenience,
and
adaptability,
we
have
sought
to
anticipate
your
needs
and
desires.
We suggest that you read this manual carefully. Knowing how to set up your receiver,
to
the
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
requirements.
Turn the pages and become aquainted with the exciting features of your new receiver,
features that will remain new for endless hours of listening pleasure.
WARRANTY REGISTRATION
IMPORTANT:
_
Fill
out
your
warranty
registration
and
mail
it
at
once.
—
——
CONTENTS
KR-5200
FEATURES
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INTERCONNECTING
DIAGRAM
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CONNECTING
YOUR
KR-5200
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CONTROLS
AND
THEIR
FUNCTIONS
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OPERATING
INSTRUCTIONS
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MAINTENANCE
.......
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12
KR-5200
SPECIFICATIONS
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TROUBLE
SHOOTING
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14

KR-5200 FEATURES
Frequency-Linear Variable Capacitor
The dial scale has linear graduations (arranged at the same intervals)
to make tuning easier.
Front End with 2 FET Circuits
The front end contains FET circuits together with one dual gate
element. These circuits assure high sensitivity, worthy of the name
KENWOOD.
1-IC and 3-Element Mechanical Filter
The 3-element mechanical filter is employed in the IF stage. It
improves the characteristics of capture ratio and selectivity.
Independent AM and FM Circuits for the IF Stage
The FM circuit for the IF stage is separated from the AM circuit.
Such a scheme is effective in the reduction of mutual interference.
Newly Developed DSD Circuit and MPX Circuit
The double switching system and the carrier leak block filter have
been adopted. They are a great aid in improving the de-emphasis
frequency characteristic and especially, improvement of stereo
separation.
Large Meter with Built in Lighting Mechanisms
The KR-5200 has a large-scale meter for tuning convenience.
Protected Semi-Complementary Direct-Coupled Power Amplifier
The power amplifier is a protected semi-complementary direct-
coupled type which assures stabilized high performance.
Equalizer Circuit with PNP Can-Type Transistor
The preceding circuit employs a PNP can type transistor for the
improvement of S/N ratio and circuit reliability.
ji
4
a

INTERCONNECTING
DIAGRAM
A
SPEAKER
SYSTEMS
C
SPEAKER
SYSTEMS
AM
OUTDOOR ANTENNA
FM
300%;
INDOOR
ANTENNA
(Lert:
RIGHT.
“LEFT
RIGHT:
aq
—
a
+
@ ©
FOR
75:1:
COAXIAL
CABLE
|
INPUT.
PHONO AUX! AUX2
© © ©°
ATAPE RECORDER-
PLAY REC/PLAY REC
@\'
Pa
©® © ©oe
ARH eet
RECORD PLAYER :
rel
|
ourgren
enn
|
Q
Te
119)
A)
qi
1
a
DIN CORD
—
LINE OUTPUT { fume INPUT
AC OUTLET
NOTE:
OO
When
a
DIN
cord
is
used
for
connecting
to
[oo
oO]
!
the
tape
recorder.
the
PLAY
and
REC
jacks
B
SPEAKER
SYSTEMS
A
TAPE
RECORDER
LEFT
RIGHT
should not be used.

CONNECTING YOUR KR-5200
SPEAKER CONNECTIONS
CONNECTING ONE PAIR OF SPEAKERS
To connect only one pair of speakers, connect the speaker leads
to the “A” SPEAKERS terminals as follows.
The (—) side lead from the left speaker should be connected to the
L (-) terminal of “A” SPEAKERS, and the (+) side lead to the L (+)
terminal. Similarly, connect the right speaker leads to the R terminals
of VA” SPEAKERS. Be sure to connect (+} to (+) and (—) to (—}.
CONNECTING ADDITIONAL SPEAKER SYSTEMS
When you connect additional speaker systems to the KR-5200,
connections to the B SPEAKERS and/or C SPEAKERS terminals should
be made as described above. Observe polarity at all times when making
speaker connections.
NOTES:
1. When only one pair of speaker systems is used with connections
made either to the ‘A’ SPEAKERS terminals or ‘’B’’ SPEAKERS
terminals, sound cannot be heard when the SPEAKERS switch
on the front panel isset to the A + B position. Likewise when only
one pair of speaker systems is used with connections made either
to the A or C SPEAKERS terminals, sound cannot be heard when
the SPEAKERS switch is set to the A + C position.
Any speaker with a impedance of 4 to 16 ohms can be used.
3. When connecting the speaker leads to the SPEAKERS terminals,
make sure that the bare wire strands at the ends of the speaker
leads do not touch each other or adjacent terminals.
N
AELEASE
t
CONNECTION TO SPEAKER TERMINALS
PHASING OF THE SPEAKERS
Speaker phasing can be determined in the following manner:
1. Set the SELECTOR switch to FM
. Set the MODE switch to MIX
. Tune in the desired station with the TUNING knob.
If the sound is coming directly from the front, the speakers are in
phase. If the sound comes from both sides and there is a noticeable
loss in low frequencies. the speakers are out of phase.
In this case reverse the leads on one speaker
PWN
RIGHT LEFT
Reverse connections of either
the LEFT or RIGHT speaker

CONNECTING YOUR KR-5200
ANTENNA
CONNECTIONS
a
3000hm
FEEDER
b
750hm
COAXIAL
CABLE
FM
ANTENNA
MATCHING
SN TRANSFORMER SRS
ANTENNA . | |
i
I}
room|
o€ © gg
75.
Since FM broadcast signals travel along a straight, direct-line path,
they
become
rather
weak
behind
hills
and
buildings
even
in
the
vicinity
of
a
broadcasting
station.
FM
signals
also
become
weak
in
areas distant from a station even though there may not be any obstruc-
tion to the direct line path of the signal. Therefore, a good FM antenna
should be installed in the most effective manner for best possible FM
reception.
In areas near the FM station where signals are strong, stretch the
T-type indoor antenna that is supplied to its maximum, and connect it
to the FM 300 &2 terminals on the rear panel. This antenna should
be carefully hung in the direction that provides best reception with
minimal undesirable reflection.
An
outdoor
FM
antenna
will
become
necessary
if
interference
is
encountered
as
a
result
of
weak
FM
signals
with
an
indoor
antenna.
if
a
300
<2
feeder
line
is
employed,
it
should
be
connected
to
the
FM
300
22
terminals.
For
a
75
ohm
coaxial
cable,
connection
should
be
made
to
the
FM
75
Q
terminals.
FM ANTENNA CONNECTION
Pull the swivel
bracket as
indicated by arrow
AM ANTENNA
The ferrite stick antenna incorporated in your KR-5200 assures
satisfactory reception from all local AM stations. Since the ferrite stick
antenna has directional properties, you should adjust the antenna to
the position at which the strongest signal is received.
In fringe areas where satisfactory reception cannot be obtained
with the ferrite stick antenna, an AM outdoor antenna should be con-
nected to the AM terminal.
“B” for best
possible reception
~
ae
eo
NOTE:
Locate
the
most
sensitive
——n
vos
AC cords, speaker leads, etc. adjacent to antenna leads may inter-
fere with reception. Keep them away as far as possible from the ferrite
stick
antenna.
AM
ANTENNA
SETTING
position within these points

CONNECTING YOUR KR-5200
CONNECTIONS FOR TAPE RECORDER
RECORDING
A tape recorder can be connected as follows for recording.
Left channel input of the tape recorder to A TAPE ‘‘L” REC jack.
Right channel input of the tape recorder to A TAPE ‘’R” REC jack.
PLAYBACK
A tape recorder can be connected as follows for playback.
Left channel output of the tape recorder to A TAPE “’L” PLAY jack.
Right channel output of the tape recorder to A TAPE “R” PLAY jack.
DIN CONNECTOR (REC / PLAY CONNECTOR)
If your tape recorder is equipped with a DIN connector, connect
it to the REC/PLAY connector with a DIN connecting cord. A DIN
connector enables recording and playback with this single cord.
NOTE:
When a DIN cord is used for connecting to the tape recorder, the
PLAY and REC jacks should not be used.
For highest fidelity recording and playback sound, however, it is recom-
mended that the tape recorder be connected to the PLAY and REC
jacks instead of the DIN connector.
RECORD PLAYER CONNECTIONS
Connect the left channel of the record player to the ““L’” PHONO
input jack, and the right channel to the ‘’R’’ PHONO input jack.
If the record player has a grounding terminal, connect it to this
receiver's GND terminal to avoid hum.
AUX (AUXILIARY INPUTS)
When a tuner, tape recorder or other unit is connected here, it
must have an output of at least 150 mV.
AC OUTLETS
The AC outlets on the rear panel of the receiver may be used to
supply power to other components such as a record player, tape
recorder, etc.
1. SWITCHED outlet
This outlet is controlled by the POWER switch on the front panel.
(The capacity is GO watts maximum.)
2. UNSWITCHED outlet
This outlet is available at all times. (The capacity is 300 watts
maximum.)
PRE OUT
The preamplifier output of the KR-5200 is obtainable here.

CONTROLS AND THEIR FUNCTIONS
—--
TUNING meter
This meter indicates the intensity of the incoming FM or
AM signal. Pinpoint tuning for any broadcast is indicated by
a maximum deflection of this tuning meter. Simply tune
to the highest meter reading with TUNING knob
a
POWER switch
Push the POWER switch to turn the receiver on
again to turn the receiver off
Push it
@KENWOOD stensa necuven KA-8200
vo
ih
DW MMO
PHONES jack SPEAKERS switch
| Plug a stereo headphone into j +
this jack for private listening. all speakers for private head-
The speakers are silenced phone listening
when the SPEAKERS switch i! A Activates speakers con-
is set to OFF position. nected to the A SPEAKERS
terminals on the rear panel.
B Activates speakers con-
nected to the B SPEAKERS
terminals on the rear panel.
C — Activates speakers con-
|. nected to the C SPEAKERS
terminals on the rear panel
| A*B — Activates simultane-
ously two sets of speaker sys-
tems connected to the A and
B SPEAKERS terminals
A+C — Activates simultane-
ously two sets of speaker sys-
tems connected to the A and
C SPEAKERS terminals
OFF — This position silences
BASS control
Turning it clockwise increases
bass tone and counterclock-
wise decreases it. Tone is flat
at center (zero) position.
TREBLE control
Turning it clock wise increases
treble tone and counterclock-
wise decreases it. Tone is flat
at center (zero) position.
MODE switch
Switch positions and func-
tions are as follows
LEFT -. The left channel ts
heard from both speakers.
RIGHT — The right channel
is heard from both speakers.
STEREO — This provides ste-
reaphonic reproduction of
any stereo program source
The left channel is heard
from the left speaker, and
the sight channel is heard
from the right speaker.
REV This reverses posi-
tions of two speakers. The
left channel is now heard
from the right speaker and
the right channel from the
left speaker
MIX — The left and right
, channels are mixed together
and are heard from both
speakers.
MIC jack
This is a microphone jack
for monophonic sound only
When you use a microphone,
set the SELECTOR switch to
MIC
B TAPE jacks
If an additional tape recorder
is used in order to operate
two tape recorders simulta-
neously, connect the input of
the tape recorder ta the B
TAPE REC jack and connect
the output to the B TAPE
PLAY jack.

CONTROLS
AND
THEIR
FUNCTIONS
BALANCE control
This BALANCE adjusts unequal volume from any program
source
in
right
and
left
channels,
The
left
channel
is
accen-
tuated when this adjuster is turned trom center “5” toward
the left side, and conversely.
VOLUME control
The VOLUME control performs simultaneous adjustment
of volumes in both channels (right and left}, Set it to your
own most satisfactory listening level.
TAPE MONITOR switches
(A and B)
The TAPE MONITOR switch-
es are used when operating a
tape recorder for monitoring
a recording or for tape repro-
duction. With the button
Pushed in, sound recorded on
the tape is heard. When the
button is released, the source
signals is heard.
If a tape recorder connected
to the A TAPE jacks on
the rear panel is used, the
TAPE MONITOR A must be
switched on. When the TAPE
MONITOR B is pressed, the
tape recorder connected to
the B TAPE jacks on the
front panel becomes availa-
ble.
The TAPE MONITOR switch-
es should be kept switched
off (by button release) unless
monitoring or tape reproduc-
tion is performed
FM MUTING switch
This switch silences intersta-
tion noise on the FM band,
but it may also eliminate the
signal of a weak and distant
station along with the inter-
station noise. Therefore, set
this switch ta OFF {by press-
ing button release} in the re-
ception of a weak and distant
station.
LOUDNESS control
The LOUDNESS control
boosts bass and treble tones
at low listening levels. Our
ears have less sensitivity to
low and high frequencies at
low listening levels and the
LOUDNESS control com-
pensates for this deficien-
cy. This control should be
switched off when listening
at normal and high levels.
LOW and HIGH FILTER
switches
LOW FILTER — Pressing
this button switch reduces
low frequency noise such as
turntable rumble, hum, etc,
on pragram materials. Gen-
erally, this filter should be
used anly when necessary
HIGH FILTER — Pressing
this button switch reduces
high frequency noise suchas
tape hiss, record scratch, etc.
Generally, this switch should
be used only when necessary. ;
SELECTOR switch TUNING knob
The TUNING knob selects
the desired AM or FM station
signal. Adjust it for maximum
deflection of the TUNING
meter as you listen to the
sound output from the speak-
ers
Switch positions and func-
tions are as follows:
AM — For AM reception
FM For the reception of
both FM monaural and stereo
signals. Automatic switching
operates between FM mon-
aural and stereo sources.
When an FM stereo broadcast
is tuned in, the STEREO in-
dicator lights up.
PHONO — in this position
the record player is available
if connected to the PHONO |!
input Jacks on the rear panel !
AUX 1. Selects source con-
nected to the AUX 1 jacks
AUX 2 — Selects source con-
nected to the AUX 2 jacks
MIC — In this position the
microphone is available if
connected to the MIC jack

OPERATING INSTRUCTIONS
FM RECEPTION
NOD
Set the SELECTOR switch to FM position.
Set the MODE switch to STEREO and the TAPE MONITOR
switches to off (by button release). To suppress interstation noise
push the FM MUTING switch, however, this should be left off if
the incoming signal is weak.
Tune in the desired station by turning the TUNING knob.
The station has been properly tuned in when the pointer of the
TUNING meter indicates a maximum deflection.
The STEREO lamp Sights up automatically when an FM stereo
station is tuned in. Set the MODE switch to MIX_ if the received
FM stereo signal is weak in relation to the noise level.
Adjust VOLUME to the desired listening level.
Adjust the balance of the left and right channels.
Use the BASS, TREBLE, LOUDNESS and FILTER to adjust
the sound to suit your own taste, as well as the acoustic conditions
of the room.
AM RECEPTION
1.
2.
3.
Set the SELECTOR switch to AM.
Set the MODE switch to STEREO and the TAPE MONITOR
switches to off (by button release).
Tune in the desired station by turning the TUNING knob. Tuning
is satisfactory when the pointer of the TUNING meter indicates
a maximum deflection.
Adjust the VOLUME to the desired listening level.
Use the BASS, TREBLE, FILTER, and LOUDNESS controls to
adjust the sound to your own taste and to the acoustic conditions
of the room.

OPERATING INSTRUCTIONS
PHONO OPERATION
1. Set the SELECTOR switch to PHONO.
2. Set the MODE switch to STEREO and the TAPE MONITOR
switches to off (by button release).
Adjust the VOLUME to the desired listening level.
4. Use the BASS, TREBLE, FILTER and LOUDNESS controls
to
adjust
the
sound
to
your
preference
and
to
the
acoustic
condi
tions of the room.
w
TAPE RECORDER OPERATION
TAPE MONITORING
If you wish to use the KR-5200 with 3-head type tape recorders,
you can perform a sound quality check by momentarily comparing
the recording source signal with the sound that has been recorded on
the tape. If you push the TAPE MONITOR switch, the recorded sound
is reproduced. If this switch is released, the source signal before record-
ing can be reproduced.
WHEN USING ONLY ONE TAPE RECORDER
Connect the tape recorder to either the A TAPE jacks on the rear
panel or B TAPE jacks on the front panel.
Recording
1. Set the SELECTOR switch to the desired program source.
For recording with tape recorder A, switch off TAPE MONITOR
B (by button release}. For recording with tape recorder B, TAPE
MONITOR A should be switched off. To monitor the recording,
push the corresponding TAPE MONITOR button.
3. Recording level should be adjusted with the volume control of
your tape recorder.
4. Recording is not affected by the VOLUME, BASS, TREBLE,
FILTER, LOUDNESS, etc., controls of the receiver.
Playback
1. The SELECTOR switch can be at any position.
2. Push the corresponding TAPE MONITOR switch. Make sure the
unused TAPE MONITOR switch has been switched off (by button
release).
3. Set the MODE switch to STEREO.
4. Adjust volume and tone quality.
WHEN USING TWO TAPE RECORDERS
Connect one tape recorder to A TAPE jacks on the rear panel and
the other to B TAPE jacks on the front panel.
For Simultaneous Recording with Two Recorders
1. Set the SELECTOR switch to the desired program source.
2. Switch off the A TAPE MONITOR (by button release).
Recording can be made into the two tape recorders simultaneously.
In this case tape recorder A cannot be monitored, but monitoring
is possible for tape recorder B.
3. Recording levels should be adjusted exactly as described previously
for single tape recorder operation.
For Recording from Tape Recorder A to B
1. Press the A TAPE MONITOR switch.
2. The SELECTOR switch can be at any position.
3. Set tape recorder A for reproduction and tape recorder B for
recording. The playback from the tape recorder A can then be
recorded on tape recorder B.
4. To monitor the recording condition, push the B TAPE MONITOR
switch.
1 Plug a microphone into the MIC jack on the front panel.
2. Set the SELECTOR switch to MIC.
3. Set the MODE switch to STEREO.
4. Adjust volume and tone quality.
i

MAINTENANCE
CONCERNING TRANSISTORS
Transistors
differ
fundamentally
from
radio
vacuum
tubes
and
require
special
attention
to
ensure
their
full
performance
capabilities.
Given
proper
care,
transistors
will
provide
years
of
practically
trouble-
free
performance.
(a) Avoid locations subject to direct sunlight.
(b) Avoid high or low temperature extremes.
(c)
Keep
the
receiver
away
from
heat
radiating
sources.
PROTECTION CIRCUIT
The newly developed protection circuit is completely effective and
prevents damage which may be caused by short-circuiting at the speaker
outputs
or
the
electrical
overloading
point.
When
a
short-circuit
occurs,
this protection circuit will function automatically to protect the power
Output
transistors.
The
program
sound
will
be
heard
off
and
on
inter-
mittently about every four seconds. {f this occurs, there is no fear of
damage to the power output transistors. Just switch off the supply
line and check the speaker connections.
ACOUSTIC FEEDBACK
Occasionally
a
disturbing
howling
sound
caused
by
acoustic
feed
back,
may
be
heard.
This
is
generally
caused
by
the
relative
positions
of
the
turntable
and
speaker
enclosures.
The
sound
pressure
radiated
from’
the
speaker
box
surrounds
and
vibrates
the
turntable.
This
vibration
is
picked
up
by
the
cartridge,
sent
to
the
amplifier
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
oscil-
lation
or
“‘howling’.
To
prevent
it,
keep
your
turntable
away
from
your
speakers.
Also
mounting
your
turntable
on
shock-absorbing
pads
may
help.
12
POWER FUSE
A
shield
3
A
fuse
is
used.
If
the
power
fuse
fails,
remove
blown
fuse
and
replace
with
the
same
type
fuse
of
the
same
rating.
Any
trouble
in
the
power
supply
circuit
will
cause
the
fuse
to
blow
again.
In
such
a case,
consult
a qualified
serviceman.
NOTE:
Always disconnect power supply before replacing a fuse.

FM TUNER SECTION
KR-5200 SPECIFICATIONS
Input Sensitivity
PHONO 2.5 mV 5OKN
Antenna Impedance 300/752 Mic 3mvVv 25k2
Usable Sensitivity (IHF) 1.8uV AUX 1 150 mV 30kQ
Harmonic Distortion AUX 2 150 mV 30k2
(at 406 Hz 100 % Mod.) TAPE PLAY A 150 mV 30k2
MONO 0.5 % TAPE PLAY B 150 mV 30KS2
STEREO 0.7% Recording Output
Signal to Noise Ratio 65 dB TAPE REC A 150 mV
Capture Ratio 2.0dB TAPE REC B 150 mV
Selectivity (Alt. CH.) (1HF) 60 dB DIN 30 mv
Image Rejection 70 dB Damping Factor {at 882) 50
IF Rejection 100 dB Hum and Noise
Spurious Signal Rejection 100 dB PHONO 65 dB
AM Suppression 70 dB MIC 55 dB
Stereo Separation {at 1 kHz) 40 dB AUX 1 75 dB
{at 10 kHz) 25 dB AUX 2 75 dB
Sub Carrier Suppression 60 dB TAPE PLAY A 75 dB
Muting Level 10pV TAPE PLAY B 75 dB
Quieting Slope 52dB Suv Speaker Impedance 4~T62
$8 dB 10nV Tone Control
65 dB S0uV BASS {at 100 Hz} +10 dB
frequency Response 20 ~ 15 kHz +0.5dB, —2dB TREBLE (at 10 kHz) +10 dB
Front End 2 FET (1DG), 4 Gang Filter
(F Stage 11C, 3 element mechanical filter Low {at 100 Hz} —7dB
HIGH (at 10 kHz) —10 dB
AM TUNER SECTION Loudness Contro! (—30 dB)
at 100 Hz +10 dB
Antenna Built in ferrite bar antenna and external antenna at 10 kHz +5 dB
terminal.
Usable Sensitivity (IHF) 15uV
Signal to Noise Ratio 45 dB
Selectivity {IHF} 35 dB
Image Rejection 70 dB GENERAL
IF Rejection 70 dB
Front End 3 Gang Switches: SPEAKERS OFF—A-—B-—C-A+B—A+C
(F Stage “ve SELECTOR AM—FM—PHONO—AUX 1—AUX 2
—MIC
AMPLIFIER SECTION MODE LEFT—RIGHT—STEREO—REV—MIX
OTHERS TAPE MONITOR A, TAPE MONITOR B,
Dynamic Power Output (IHF) LOW—HIGH FILTER, FM MUTING,
Both CH. 42 1 kHz 140 watts LOUDNESS, MIC jack.
Both CH. 82 1 kHz 115 watts AC Outlets SWITCHED 1
Continuous Power Output UNSWITCHED 1
Each CH, 492 1 kHz 52/52 watts Semiconductors 2 FETs, 1 tC, 51 Transistors, 48 Diodes,
Each CH. 82 1kHz 44/44 watts Power Consumption
Both CH. 482 1kHz 40/40 watts at full power 260 watts
Both CH. 82 1kHz 33/33 watts at no signal 40 watts
Both CH. 82 20 ~ 20 kHz 30/30 watts Dimensions 17-1/8" W, 5-3/4” H, 14” D
Harmonic Distortion (at rated} 0.5 % Weight 24.6 ibs.
(at —3 dB rated} 0.1% Wainut Cabinet (included in price) YES
1, M. Distortion {at rated) 0.5 %
(at —3 dB rated) 0.1 %
Frequency Response 20 ~40kHz +2dB
{High Level Input)
Power Band Width (IHF} 17 ~ 30,000 Hz

INDICATIONS
TROUBLE SHOOTING
in initially installing this receiver, improper connections may result in one of
the following indications of trouble, Their possible causes and corrective measures
are listed below to facilitate installation.
Occurs Only During AM Reception
Cause
Correction
Continuous low frequency buzz. Most notice-
able at night on weak signal stations.
Continuous high frequency whine which in-
creases at night.
Intermittent buzzing or sharp crackling roise.
Interference from amateur stations
Interference from electrical appliances or at-
mospherics.
TV interference.
10 kHz beat interference from adjacent AM sta-
tion.
Lightning interference.
Interference from fluorescent lamps.
AC Plug Connection.
Called BCI, this interference results from
neighboring amateur stations.
{Also occurs on FM}
Erecting a 10 meter outdoor antenna and securing good
ground conditions should reduce interference consid-
erably. Complete elimination is difficult.
Turn TV off. (Neighboring TV set may also be cause.)
Impossible to eliminate from receiver side. This is one
disadvantage of the AM broadcast system. Use High
Filter to cut off high frequency interference.
Occurs when lamps are on and cannot be not helped.
Try reversing AC plug connections.
Occurs only on certain stations due to high voltage power
line and cannot be helped in many areas.
Consult interfering station operator or authorities con-
cerned.
Occurs Only During FM Reception
Cause
Correction
Continuous hiss or buzzing interference with
broadcast, Becomes louder during stereo.
Occasional sharp buzzing or crackling noise.
Weak right channel response when listening
to LEFT only test FM Stereo broadcast.
FM Automatic Circuit fails to respond to
stereo broadcast.
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Incoming signal too weak at ANT terminal.
Automobile ignition noise. More noticeable on
weak signals.
Called crosstalk, a very slight response is
normal.
Incoming signal is exceptionally weak.
Erect outdoor FM antenna if only indoor T-type is
used. A 5 or 7 element antetina is necessary if you
are located at a considerable distance from the broad-
casting station.
Erect outdoor FM antenna as far away from roads as
practicable.
If leakage is less than one tenth, it is not a sign of trouble.
It cannot be reduced to zero.
Erect an FM outdoor antenna.

INDICATIONS
During AM, FM or Record Playback
Cause
Correction
No pilot lamp indication, no sound although
AC is switched ON.
No sound from LEFT and RIGHT. _
Poor AC plug connection.
Blown fuse.
SPEAKERS switch set to A + B or A+ C posi-
tion.
Speaker cords disconnected.
SPEAKERS switched to OFF.
Volume Control at 0 {extreme left)
TAPE MON switch at ON position
(button push).
Check plug contact.
Replace fuse. If it blows again, trouble must be corrected.
Both A-B or A-C groups of speakers are required in this
case for response from both sides.
Check connections from amp output to speakers.
SPEAKERS switch should be switched to OFF only when
using stereo headphones.
Set to appropriate volume level.
Always set to OFF except when using tape recorders.
Sound only from one side.
Poor speaker cord connections.
BALANCE control set to one extreme or
other.
Noise when AC is switched ON or when volume
Adjust BALANCE control.
Insufficient circuit warmup.
Allow 5 - 6 second interval after switching AC ON, before.
manipulating volume control.
is adjusted immediately after.
Unbalance results when volume is lowered.
Intermittent speaker response at 4 seconds
intervals.
LEFT RIGHT resistor values unbalanced.
Adjust BALANCE control.
Protection Circuit indication of short circuit in
the output.
Difference in volume level of radio and phono. Difference in received signal and phono output
levels.
Check speaker cord connections.
Set to appropriate volume level.
During Phono Record Playbacks Only.
Cause
Correction
No sound from LEFT and RIGHT, or sound
onty from one side.
Loud hum drowns out sound.
Sound audible but background hum oceurs.
interferes.
Player output disconnected.
See that player output cord is firmly plugged into amp.
input.
Poor player output cord prong connections.
Player output cord picking up hum from AC
cord.
Player not grounded.
TV signal picked up by Player output cord.
Frequently occurs near TV transmitting antenna.
See that player output cord is firmly plugged into amp.
input.
Keep player output cord away from AC cords.
Choose cord paths which keep hum at a minimum.
Twist LEFT RIGHT player output cords together.
Reverse player AC plug connections.
Connect player ground wire to GND terminal.
Route player cord so that hum is minimized.
Howling noise occurs when volume is raised or
bass response is increased.
Speaker vibrations induce feedback in Pickup.
Increase distance between player and speakers.
Choose speaker locations carefully.
Remember, loose flooring induces howling.
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