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the amplifier. These fuses are not intended to be replaced
by the user; if the amplifier shuts down you should return
it for service.
\
If this occurs, you should examine whether a pattern
of unintended abuse may have contributed to the failure.
For example you may have a loose strand of speaker wire
causing a partial short-circuit either at the speakers or at the
amplifier's speaker terminals. The impedance of your speak-
ers may be lower than you think; if you are not sure, set the
SPEAKER IMPEDANCE switch to 4 OHMS. You may be com-
bining maximum bass boost with high volume settings. Or
you may simply be playing the music at continuously high
power levels that demand a larger amplifier with high-power
transistors and bigger heat-sinks.
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IN CASE OF DIFFICULTY:
A TROUBLE-SHOOTING GUIDE
SYMPTOM
No sound.
No sound in
one channel.
POSSIBLE CAUSE
Power not on.
Line cord unplugged.
Tuner selected but tuned to a blank
frequency between stations.
CD input selected with no CD playing.
'Tape Monitor engaged with no
tape playing.
Headphone plug inserted in PHONES
jack.
Internal fuses blown to protect the
amplifier from short-circuited speaker
wires or from overheating caused by
overdriving the amplifier into a low im-
pedance with the Impedance Selector
at 8 ohms.
—
Balance control turned full-left
or full-right.
Loudspeaker connecting wire pulled
loose (check all connections, both at
speakers and at the amplifier).
Connecting cable pulled loose or
making poor contact in socket. Rotate
plugs in sockets to restore contact.
Short-circuit in a defective con-
necting cable. Wiggle all cables,
especially where they enter plugs.
Dirty contact in a switch. Exercise all
front-panel switches to restore clean
wiping contact.
Low-frequency
hum in phono.
Turntable grounding wire not connected.
Ground-loop hum. Install polarized
AC plugs properly in polarized wall
sockets (in which one slot is longer
than the other). Try reversing any non-
polarized plugs in their sockets, to find
the orientation that yields the least hum.
SYMPTOM
Low-frequency
hum in phono.
(continued)
Hum in tape
playback.
Distorted
reception of
FM stations.
POSSIBLE CAUSE
Turntable located too close to the am-
plifier (especially to its left). Locate the
turntable to the right of the amplifier.
Phono cables routed too close to
the amplifer's power transformer
(at left-rear).
Phono plugs making poor contact in
socket. (Also check any phono plugs
in the turntable base.)
Tape deck located too close to
amplifier (directly above or below).
Tape deck located too close to
television set.
Plugs making poor contact in sockets.
"Multipath" reception. Rotate antenna
to find the orientation that provides
best reception. (The best orienta-
tion may vary from station to station.)
Raise the height of the antenna. If
your building has steel-frame or steel-
reinforced concrete construction, move
your FM antenna outside, and use a
shielded 75-ohm coaxial lead-in cable.
if all else fails, switch to Mono reception.
Whistle
or buzz in
AM or FM.
Weak bass;
diffuse stereo
imaging.
Video game, computer, or computerized
game operating nearby.
AM only: static due to electric motors
or fluorescent lights. Minimize by tun-
ing to a strong station, or install an
external antenna.
Speakers wired out of phase.
Swap connections at the back of
ONE speaker.
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