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46
US
MHC-V21.US.4-736-607-
12
(1)
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Check the connection of the
optional equipment, if any
(page 15).
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Turn on the connected equipment.
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Unplug the AC power cord (mains
lead), then plug in the AC power
cord (mains lead) again and turn
on the system.
There is no microphone sound.
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Adjust the microphone volume
level.
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Make sure the microphone is
connected to the MIC1 or MIC2/
GUITAR jack on the unit correctly.
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Make sure the microphone is
turned on.
There is severe hum or noise.
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Move the system away from
sources of noise.
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Connect the system to a different
wall outlet.
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Install a noise filter (not supplied)
to the AC power cord (mains lead).
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Turn off surrounding electrical
equipment.
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The noise generated by the
cooling fans of the system may be
heard when the system is turned
on. This is not a malfunction.
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Move the unit away from the neon
signs or fluorescent light.
The remote control does not
function.
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Remove the obstacles between
the remote control and the unit.
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Move the remote control closer to
the unit.
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Point the remote control at the
unit’s sensor.
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Replace the batteries (R03/size
AAA).
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Move the unit away from the
fluorescent light.
There is acoustic feedback.
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Reduce the volume.
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Move the microphone and guitar
away from the system or change
the direction of the microphone.
“CHILD LOCK” appears when you
press any button on the unit.
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Set the Child Lock function to off
(page 44).
A clicking sound is heard when the
system is turned on.
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This is the operating sound and it
occurs when the system is turned
on or off, for example. This is not a
malfunction.
The sound loses stereo effect
during playback.
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Turn off the Vocal Fader
(page 41).
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Make sure the system is
connected properly.
Disc player
The disc tray does not open and
“LOCKED” appears on the display.
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Consult your nearest Sony dealer
or local authorized Sony service
facility.
The disc tray does not close.
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Load the disc correctly.
The disc does not eject.
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You cannot eject the disc during
Synchronized Transfer or REC1
Transfer. Press
to cancel the
transfer, then press
on the unit
to eject the disc.
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Consult your nearest Sony dealer.
Playback does not start.
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Wipe the disc clean (page 52).
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Reload the disc.
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Load the disc that this system can
play back (page 8).