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IN
CASE OF DIFFICULTY:
A TROUBLE-SHOOTING GUIDE
SYMPTOM POSSIBLE CAUSE
SYMPTOM POSSIBLE CAUSE
No
sound.
Power not on.
Low-frequency
sockets (in which one slot is longer
Line cord unplugged.
hum in phono.
than the other).
Try
reversing any non-
(continued)
polarized plugs in their sockets, to find
Tuner selected but tuned to a blank
the orientation that yields the least hum.
frequency between stations.
Turntable located too close to the am-
AUX input selected with no auxiliary
plifier (especially to its left). Locate the
source playing.
turntable to the right of the amplifier.
Tape
Monitor engaged with no
Phono cables routed too close to
tape playing.
the amplifer's power transformer
Speaker switch set to OFF, or to B
(at left-rear).
when speakers are connected only
Phono plugs making poor contact
in
to the
"
N.'
terminals.
socket. (Also check any phono plugs
in
Internal fuses blown to protect the
the turntable base.)
amplifier from short-circuited speaker
wires or from overheating caused by
Hum
in
tape
Tape deck located too close to
overdriving the amplifier into a low im-
playback.
amplifier (directly above or below).
pedance with the Impedance Selector
Tape deck located too close to
at 8 ohms.
television set.
No
sound
in Balance control turned full-left
Plugs making poor contact
in
sockets.
one channel.
or full-right.
Distorted
"Multipath" reception. Rotate antenna
Loudspeaker connecting wire pulled
reception
of
to find the orientation that provides
loose (check all connections, both at
FM stations.
best reception. (The best orienta-
speakers and at the amplifier).
tion may vary from station to station.)
Pre-Out/Main-In jumper pulled out,
Raise the height of the antenna. If
missing, or making contact with any
your building has steel-frame or steel-
metal object.
reinforced concrete construction, move
Connecting cable pulled loose or
your FM antenna outside, and use a
shielded 75-ohm coaxial lead-in cable.
making poor contact in socket. Rotate
plugs in sockets to restore contact.
If
all else fails, switch to Mono reception.
Short-circuit
in
a defective con-
Whistle
Video game, computer, or computerized
necting cable. Wiggle all cables,
or buzz in
game operating nearby.
especially where they enter plugs.
AM
or
FM
.
AM
only: static due to electric motors
Dirty contact in a switch. Exercise all
or fluorescent lights. Minimize by tun-
front-panel switches to restore clean
ing to a strong station, or install
an
wiping contact.
external antenna.
Low-frequency
Turntable grounding wire not connected.
Weak bass;
Speakers wired out of phase.
hum in phono.
Ground-loop hum. Install polarized
diffuse stereo
Swap connections at the back of
AC plugs properly in polarized wall
imaging.
ONE speaker.
11
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