Marantz PM8003 - Manual (Page 16)

13
Names aNd FuNctioNs
Basic
coNNectioNs
Basic
opera
tioN
adV
aNced
coNNectioNs
remote coNtroller
opera
tioN
trouBleshootiNg
others
trouBleshootiNg
ENGLISH
trouBleshootiNg
aBout the protectiVe circuit
This unit is equipped with a protective circuit to
protect the amplifier circuits and speaker system
against damage.
If the protective circuit is activated, the sound is
instantly muted.
In this case, either the MUTE indicator flashes, or
the STANDBY indicator above the POWER ON/OFF
button flashes.
at poWer oN
For about 8 seconds after the power is turned on,
the protective circuit is activated muting the sound
to give the amplifier circuits time to stabilize. Once
the amplifier circuits stabilize, the protective circuit
releases and audio is enabled.
iN the eVeNt oF oVercurreNt
The protective circuit is activated if current exceeding
a certain level is detected, which can happen if
excessive signal flow is input to the amplifier or if
the unit is connected to a speaker system of less
than 4
Ω impedance. The protective circuit is also
activated if a speaker cable shorts.
In these cases, the MUTE indicator flashes, and
the volume is automatically reduced. Approximately
15 seconds later the protective circuit is released,
therefore the volume needs readjusting to continue
normal use.
Moreover, if the overcurrent continues, the amplifier’s
power shuts OFF and the STANDBY indicator above
the POWER ON/OFF button flashes.
iF eXcessiVe ultra-Bass sigNals are iNput
The protective circuit is also activated if ultra-
bass signals that exceed the base signal range
settings are input. In this case, the MUTE indicator
flashes, and the volume is automatically reduced.
Approximately 15 seconds later, the protective
circuit is released, therefore the volume needs
readjusting to continue normal use. If excessive
ultra-bass signal input continues or if DC voltage
is detected due to trouble with the amplifier, the
power shuts OFF and the STANDBY indicator above
the POWER ON/OFF button flashes.
iF the maiN-ampliFier oVerheats
The protective circuit is activated if the temperature
of the main-amplifier section rises above a certain
level, which can happen if the amplifier is continually
used with excessive signal flow being input into
it. The protective circuit is also activated when
the set operating temperature is exceeded, which
can happen if the vents on top of the amplifier are
covered, or if the amplifier is installed on a cramped
audio rack. In these cases, the MUTE indicator
flashes, and the volume is automatically reduced.
Approximately 15 seconds later, the protective
circuit is released, therefore the volume needs
readjusting to continue normal use.
If the temperature does not sufficiently lower
within a certain amount of time after the protective
circuit activation, the power shuts OFF and the
STANDBY indicator above the POWER ON/OFF
button flashes.
iN the eVeNt oF ampliFier trouBle
The protective circuit is activated and the power is
automatically shut OFF if an abnormality is detected
in the power circuit. The same happens if the main
fuse inside the amplifier blows. In these cases, the
STANDBY indicator above the POWER ON/OFF
button flashes.
In cases as mentioned above, immediately
disconnect the power cord, and contact the place of
purchase, your nearest Marantz dealer, our customer
service center, or our repair service center.
BeFore coNsideriNg it as a Failure
In case of trouble with this component, first check the following before calling for service.
What seems to be a serious malfunction is often due to a simple operation mistake.
If the trouble is not fixed after making the following checks, contact the place of purchase, your nearest
Marantz dealer, our customer service center, or our repair service center.
Phenomenon Causes Actions
Power is not supplied.
The power cable is disconnected. Check the power cable connections.
The unit is in STANDBY mode.
Turn the INPUT SELECTOR knob or
press the POWER ON button on the
remote controller.
The protection circuit is activated.
If the STANDBY indicator is flashing,
turn the power OFF, then ON again
after 1 minute or more.
Power is supplied, but no
sound is heard from the
speaker.
Speaker connection is incomplete. Check the speaker cable connection.
Input cord connection is incomplete. Check the input cable connection.
The INPUT SELECTOR knob is not set
correctly.
Set the INPUT SELECTOR knob
properly.
The VOLUME knob is set to minimum.
Turn the VOLUME knob to the proper
level.
• The SPEKAERS knob is set to OFF.
• Setting of the SPEAKERS knob is
incorrect.
Set the SPEAKERS knob properly
according to the SPEAKER terminals
to which the speakers are connected.
Setting of the POWER AMP DIRECT
button is incorrect.
Set the POWER AMP DIRECT button
properly.
The MUTE function is activated.
If the MUTE indicator is lit, press the
MUTE button on the remote controller
to release the MUTE function.
Sound is heard from left or
right speakers only.
Speaker connection is incomplete. Check the speaker connections.
Setting of the BALANCE knob is
incorrect.
Set the BALANCE knob properly.
Left and right channels are
reversed.
Connection of left and right speaker
cords or input cords is reversed.
Make connections properly.
Noise occurs during record
playing.
Grounding connection from the record
player is improper.
Check the connections to the PHONO
GND terminal.
Connection to the PHONO jacks is
incorrect.
Check the connection to the PHONO
input jacks.
A TV set or the like placed too close to
the record player may affect the sound.
Place the TV set or record player in
another position.
Howling occurs when sound
volume is increased during
record playing.
Speakers are placed too close to the
record player.
Place the speakers away from the
record player as far as possible.
The record player is placed on a rack or
floor that is easily vibrated.
If an insulating pad is not supplied with
the record player, use an insulating pad
available in the market.