Luxman P-700U User Manual
HEADPHONE AMPLIFIER
P-700u
HEADPHONE AMPLIFIER P-700u
Contents
Precautions ……………………………………………………………………………………………………………1
Product Characteristic ………………………………………………………………………………………………2
Names and Functions ………………………………………………………………………………………………4
Mem ory ……………………………………………………………………………………………………………… 6
Connections …………………………………………………………………………………………………………7
Before Making Connections …………………………………………………………………………………………8
Block Diagram ………………………………………………………………………………………………………9
Specifications ………………………………………………………………………………………………………10
Troubleshooting ……………………………………………………………………………………………………11
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Precautions
Installation place
This unit should be installed in a well-ventilated place to
allow for easing air circulation. Do not install this unit at a
place where it would come under direct sunlight or where
the high temperatures are expected like close to a heater.
Keep the unit away from places where humidity level is high
or excessive dust is present, this may cause malfunction of
the unit.
Cautions in connecting input components
When connecting this product to a source like a CD player,
be sure to turn off this device and the connecting source.
Failure to observe this may generate a pop noise resulting
in headphone damage or temporary malfunction.
Make sure to insert the plug-pin firmly in the each input
terminal of this product, failure to do so will give rise to
inadequate grounding resulting in distorted output signals
with a high signal to noise ratio.
Protection circuit
This product is equipped with a protection circuit that guards
against over-current, abnormally high temperatures and DC
drift. When the protection circuit is activated, the output to
the headphone is terminated and the operation light blinks
to indicate the status of the product to be in mute mode.
If the protection circuit is frequently activated after a
lapse of a certain me and turning on the power again,
please consult your dealer.
Repair and adjustment
There are no user servable parts inside the unit, please
do not attempt to open it yourself, doing so will void your
warranty. When repairs or adjustments are needed, please
consult your dealer or the authorized local distributor.
Cleaning
The amplifier should only ever be cleaned with a soft dry
cloth to remove finger marks, etc… Do not use a solvent
like benzene or thinner because such a substance can
often damage the exterior.
Pay attention to use the headphone
For a long time continuous use ear stimulating the volume,
may cause damage to hearing.
Sound is not generated immediately after
the power supply is turned on.
This amplifier is equipped with a mute circuit which is
activated for a short period of time at switch on. Therefore,
no sound is generated shortly after the power supply is
turned on. Please be pati ent and do not increas e the
volume during this period as this will suddenly generate a
highly amplied sound. It is advised that the volume control
be set to a low level at rst and adjusted once you hear the
sound from you headphones.
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Product Characteristic
HEADPHONE AMPLIFIER P-700u
3 Darlington output section
Made up of Bipolar Transistor’s 3 section Darlington.
Balance: 8 w + 8w (16Ω) and Unbalance: 4w + 4w (8Ω)
rated output.
Can be corresponding to the Balance of
the headphone is high quality Balance/
unbalance headphone
It has the same independent quality of 4 channel discrete
'amplier, corresponding XLR can balance headphone.
Transfer the balance input and output can be straight,
unbalance is L/R2 straight transmission on the channel in
parallel connection, the composition has a strong driving
force.
It can also be corresponding to the balance of input and
unbalance, headphone, unbalance input to the balance of
the headphone.
LECUA – LUXMAN Electric Controlled Ultimate
Attenuator
Mount with Electrically controlled attenuator for gaining
attenuation amount in combination with the resistance.
By using the dedicated solid state IC to control the
attenuator to the sound volume corresponding to the angle
of the volume knob, the operation texture similar with
conventional slide-type volume is realized.
And balance phase of the power amplifier, correlation
of inverse phase error function also is very good, can
accurately control the balance.
High inertia power source
High-inertia elec tronic circuit that combines a large-
capacity OI-core-type power transformer with customizable
10,000μFⅹ2 capacitor blocks.
Parallel speaker relay
Will be used 2 the company merger borne power amplier,
low impedance value of large Speaker relay in parallel,
reduces the headphone output impedance of the line.
B-line construction
Newly designed beeline construction composes the audio
input signal via the optimally shortest route to the output.
Selector relay
Ad opted power amplifier used by t he co mp any c an
improve the high quality of separation and crosstalk
performance Selector relay.
Schottky barrier diode
Application of schottky barrier diode manufactured by
Nihon Inter Electronics Corporation that has less switching
noises and higher conversion efciency to the DC voltage
for the power supply rectier circuit.
Original OFC wire
Our original OFC wires are used in the internal wiring to
achieve smooth signal transmission thanks to the spiral
wrap shielding on each core and the non-plating process
on the core wire.
ODNF – Only Distortion Negative Feedback–
The amplification feedback circuit that has acquired the
high-speed primary slew rate and ultra-high bandwidth by
feeding back only distortion components generated during
amplification to maintain the pure sound quality of the
main-amplier that is almost non-feedback.
The n e wes t ver s ion , 3.0 A , has achi e ved t he lo w
impedance and high S/N ratio of the transmission circuit
by parallelization of the first and second stages of the
error detection circuit are parallelized to moderate the
frequency characteristic and noise.
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