INTEGRATED AMPLIFIER
L-507u
Owner`s Manual
Contents
Precautions·············································································································· 1 Names and Functions······························································································ 2 Connections············································································································· 8 Operations············································································································· 12 How to Use Remote Control·················································································· 14 Block Diagram······································································································· 15 Specifications········································································································· 16 Before Asking for Repair Services··········································································· 17
Precautions
INTEGRATED AMPLIFIER L-507u
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 excessively 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 cooling and leave the door open. Do not pile up other things on the amplifier and never put articles on it. This can cause malfunctioning.
Note:
For heat dispersal, do not install this equipment in a confined space such as a book case or similar unit.
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Precautions in connecting with other components
When connecting this product to input devices such as a CD player, a Super Audio CD player, a tuner, and a recorder, be sure to turn off the power of this product and all other con nected 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 prod uct shall be pushed in firmly. If the grounding terminal is inad equately connected, noises including hum may be generated, resulting in an adverse S/N ratio.
Cautions in connecting speakers
When making speaker system connections, exercise extra care not to short-circuit between ! and @ of the speaker terminals and speaker input terminals of this product. If a large signal is applied to the amplifier with its circuit left shortcircuited, a large current may be passed through the output circuit 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 gener ated shortly after the power supply 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 adjusted after sound comes out of the speakers.
Protection circuit
This product is equipped with the protection circuit that is activated upon detection of overcurrent, abnormally high temperature, and DC drift to protect the amplifier and speak ers. When the protection circuit is activated, the output to the speaker terminal is shut off and the standby indicator blinks to show that this product is in the muting state. If the protection circuit is frequently 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 adjustments
When repairs or adjustments are needed, please ask your dealer where you bought the product.
Cleaning
For cleaning, use a piece of soft cloth to wipe the product such as cleaning cloth available on the market. If the prod uct 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 often damage the exterior.
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Names and Functions
Front side of main unit
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1. Operation switch (stand by/on)
This switch turns the power supply ON/OFF.
When wiring or connection is performed, be sure to turn off this switch.
2. Operation indicator (OPERATION)
Blinks in the time muting mode when the operation switch is turned on and lights up when the operation state is ac tivated afterward. This indicator blinks when the unit is in the muting mode or when the volume is adjusted with the remote control.
3. Input selector (INPUT SELECTOR)
Selects an input device from the devices such as a CD play er, a Super Audio CD player and a tuner connected to each input terminal.
The input selector has 8 positions consisting of bal.line-2, line-4, line-3, line-2, line-1, rec-1, rec-2, and phono that correspond to each input terminal on the rear panel. The knob is rotated to light the input indicator of the input device to be selected.
4. Input indicator
Lights up at the input device to be selected with the input selector or remote control.
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INTEGRATED AMPLIFIER L-507u
5. Phono MC cartridge on/off switch (phono MC)
Changes the gain level of the equalizer amplifier (amplifier circuit required to play an analog record).
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ON is selected by pressing this switch when MC |
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(moving coil) type cartridge of low output voltage |
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is used. |
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Be aware that the sound volume becomes higher |
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and unbalanced sound without high frequencies |
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is generated owing to the impedance when “MC” |
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is selected during use of the MM type cartridge. |
MM:OFF is selected when MM (moving magnet) type
cartridge of high output voltage is used.
6. LINE-2 unbalance/balance selector (bal. line-1)
Toggles between the unbalance input terminal (LINE-2) and balance input terminal (BALANCED LINE-1) when the input selector is set to the line-2 position.
: BALANCED LINE-1 is selected. 
: LINE-2 is selected.
7. Power meters
The left meter reads the output of the L channel, and the right meter reads the output of the R channel.
The meters read the level in decibels. The meters light when the power is on.
8. Remote sensor (remote sensor)
Receive signals from the accessory remote control.
9. Standby indicator (stand by)
Lights when the AC plug is plugged into a wall socket and the operation switch is set to off.
This indicator turns off when the AC plug is disconnected from the wall socket or the operation switch is set to on. This indicator blinks when the protection circuit is activated.
10. Volume control (VOLUME CONTROL)
Adjust the sound volume. Sound is not generated when this control is rotated counterclockwise to the end, and then, the sound volume gradually becomes higher when the con trol is slowly rotated clockwise.
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Names and Functions
Front side of main unit
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11. Separate switch (separate)
Separates the pre-amplifier and main-amplifier each other.
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Uses this unit as a normal pre-main amplifier. |
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ON: |
Feeds external signals from the MAIN IN terminal |
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on the rear panel to the main-amplifier section. |
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When the separate switch is set to on, the volume control of this unit cannot adjust the volume of the speakers connected to this unit. Volume adjustment shall be performed at the input device side such as the control amplifier connected to the MAIN IN terminal.
Entry of direct output into the MAIN IN terminal from a CD player or other devices that cannot adjust sound volume constantly provides a full power state and accordingly results in the risk of speaker damage.
For such input devices, be sure to use a control amplifier equipped with sound volume adjustment function as a relay, generate sound through the speakers with volume lowered, and adjust the volume to your favorite level.
12. Subsonic (subsonic)
Cuts ultra-low frequencies out of audible range to pre vent ultra-low range noise from adversely affecting audible range.
This function is significantly effective especially when a re cord is warped or a woofer is shaking owing to ultra-low range vibration.
OFF: Subsonic off
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Subsonic on |
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13. Line straight (line straight)
Enhances the purity of the sound quality by bypassing the balance control circuit, tone control circuit, or the like.
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Line straight off/bypass off |
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ON: |
Line straight on/bypass on |
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When the line straight switch is set to on, the balance control and tone control cannot be adjusted and the mode selector does not function.
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