INTEGRATED AMPLIFIER L-507u
Before Asking for Repair Services
While the unit is used, an unusual phenomenon may be confused as a malfunction for a certain reason. Prior to asking us
for repair services, please check the table below and read the instruction manual for the subsidiary devices. If the cause of
the malfunction cannot be identified, please contact your dealer.
Problem
Cause
Solution
No power is supplied even
though the operation switch is
pressed ON.
· The power plug is disconnected from the
wall outlet, or it is not completely inserted.
· Insert the power plug in the wall outlet se�
Insert the power plug in the wall outlet se�
curely.
· The power plug is disconnected from the
AC inlet, or it is not inserted completely.
· Insert the power plug in the AC inlet se�
Insert the power plug in the AC inlet se�
curely.
No sound is generated.
· The volume control is set to the minimum
level.
· Rotate the volume control clockwise to ad�
Rotate the volume control clockwise to ad�
just the sound volume.
· The input selector is not set in the playback
source position.
· Set the input selector in the playback source
position.
· Cable connections are incomplete.
· Make cable connections securely.
· The output level of the input device is set to
the minimum position.
· Adjust the output level.
· The separate switch is set to on.
· Set the separate switch to off.
No sound comes out on one
side.
· The balance control is fully rotated.
· The balance control shall be set to the cen�
The balance control shall be set to the cen�
ter position under normal conditions.
· The connecting cable is not connected on
one side only.
· Make cable connections securely.
Humming sound (boon or zzz
noise) is generated.
· The ground side of the pin�plug cable has
no contact with the terminal.
· Make connections securely so that the
ground side of the pin�plug cable makes
contact with the terminal.
· The ground wire of the record player is not
connected.
· Connect the ground wire of the record play�
er to the GND terminal.
· Connections or mounting conditions are in�
Connections or mounting conditions are in�
complete between the cartridge and shell,
or between the shell and tone arm of the
record player.
· Connect (or mount) the cartridge, shell, and
tone arm securely.
No effect of tone control or bal�
ance control is observed.
· The line straight switch is turned on.
· When tone control or balance control is
used, the line straight switch shall be set to
off.
The light of the power meter is
not turned on.
· The display switch is set to off.
· Set the display switch of the remote control
to on.
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