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Before assuming that your unit is faulty, please check the following troubleshooting list which details the corrective
action you can take yourself without having to call a service engineer. If you have any doubts or questions, contact
your nearest Yamaha dealer.
Power is not supplied even
though the Power switch is
turned on.
There is no sound with any input
selector switches pressed.
There is no sound from one
speaker.
There is a lack of bass ard no
ambience.
There is a humming sound
when playing records.
There is a howling sound when
playing records athigh volume.
Turning the Bass or Treble knob
does not affect the tone.
The sound suddenly goes off.
The power plug is not securely plugged
in.
Plug it in securely.
The Speakers switch is not set correctly. | Set the Speakers switch correctly.
The input cords are not connecied se-
Connect them securely.
curely.
The speaker system is not connected
Check and secure connections.
correcily.
The speaker connections are not secure. | Secure the connections.
The Balance contro! is set all the way to
the left or right.
Adjust the Balance control cor-
rectly.
The + and — cords have been reversed
atthe amp or speakers.
Connect the speaker wires in the
correct phase (+ and —).
The input cords are not connected se-
curely.
Piug the input cords in securely.
The turntable's ground wire is not con-
Connect the ground wire.
nected.
The turntable and the speakers are too
close together or the turntable is not
mounted on a firm surface.
Change the location of the turntable
or the speakers.
The Tone Bypass switch must be
turned off to use the controls.
Turning the AX-400/U off and then
on will reset the speaker protection
The Tone Bypass switch is on.
Driving speakers outside the rated impe-
dance range ai high power for an extended
period has activated the speaker pro-
circuit. Use speakers inside the
tection circuit.
rated impedance range.
There is a malfunction in the amplifier.
Consult your Yamaha dealer.
British and Australian Model
n
2 А
66
С
=
©-@-
ШИ
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