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Contents
Precautions ...................................................................................................................3
Names and Functions ...................................................................................................4
Connections ................................................................................................................10
Operations ..................................................................................................................12
How to use remote control ..........................................................................................14
L-505u Block Diagram ................................................................................................15
Specifications ..............................................................................................................16
Before asking for repair services ................................................................................17
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Precautions
Installation place
This unit shall be installed in a well-
ventilated and effectively heat-
released place.
Especially, installation of this unit
where direct sunlight is present,
where the temperature rises exces-
sively high such as close to a heater,
or where it is humid or dusty may
cause a malfunction even if heat is
efficiently released. Therefore, do not
install this unit in such places.
Ventilation holes
If the amplifier is installed on a rack or
the like, secure ample space for cool-
ing and leave the door open. Do not
pile up other things on the amplifier
and never put articles on it. Failure to
observe this may cause a malfunction.
Note:
For heat dispersal, do not install this
equipment in a confined space such
as a book case or similar unit.
Precautions in connecting
with other components
When connecting this unit to input
devices such as a CD/DVD player, a
tuner, and a recorder, be sure to turn
off the power of this unit and all other
connected devices. Failure to observe
this may generate a strong noise
resulting in speaker damage or cause
a malfunction.
The pin-plug to be inserted in each
input terminal of this unit shall be
pushed in firmly. If the grounding ter-
minal is inadequately connected, nois-
es including hum may be generated,
resulting in an adverse S/N ratio.
Cautions in connecting
speakers
When making speaker system con-
nections, exercise extra care not to
short-circuit between !and @of the
speaker terminals and speaker input
terminals of this unit. If a large signal
is applied to the amplifier with its cir-
cuit left short-circuited, a large current
may be passed through the output cir-
cuit and cause a malfunction.
The sound is not generated
shortly after the power supply
is turned on.
This amplifier is equipped with a time
muting circuit in order to separate the
output circuit. Therefore, no sound is
generated shortly after the power sup-
ply is turned on.
If the volume control is moved to a
high sound level before the time mut-
ing circuit is canceled, a large sound
is suddenly generated. Please be
advised that the volume control shall
be set to a low level at first and adjust-
ed after sound comes out of the
speakers.
Protection circuit
This product is equipped with the pro-
tection circuit that is activated upon
detection of overcurrent, abnormally
high temperature, and DC drift to pro-
tect the amplifier and speakers. When
the protection circuit is activated, the
output to the speaker terminal is shut
off and the standby indicator blinks to
show that this unit is in the muting
state. If the protection circuit is fre-
quently activated after a lapse of a
certain time and turning on the power
again, please consult your dealer.
Batteries
Caution:
Batteries used for remote controller
shall not be exposed to excessive
heat such as sunshine, fire or the like.
Repair and adjustment
When repairs or adjustments are
needed, please ask the dealer where
you bought the unit.
Cleaning
For cleaning, use a piece of soft cloth
to wipe the unit such as cleaning cloth
available on the market. If the unit has
become remarkably dirty, remove the
dirt with soft cloth absorbing a small
amount of neutral detergent, and then
wipe the unit with dry cloth. Do not
use a solvent like benzine or thinner
because such a substance can dam-
age the exterior.
* Note
Wall
* *
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