Yamaha AX-490 Owner's Manual: Troubleshooting

Natural sound stereo integrated amplifier.
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TROUBLESHOOTING

If the unit fails to operate normally, check the following points to determine whether the fault can be corrected by the simple
measures suggested. If it cannot be corrected, or if the fault is not listed in the SYMPTOM column, disconnect the power cord and
contact your authorized YAMAHA dealer or service center for help.
SYMPTOM
The unit fails to turn on when the POWER
switch is pressed.
No sound.
The sound suddenly goes off.
Only one side speaker outputs the sound.
There is a lack of bass, and no ambience.
Sound "hums".
Sound level is low.
Sound level is low or sound is distorted
while playing a record on the turntable.
(For AX-590 only)
The INPUT selector will not function
though it is turned.
Using the BASS, TREBLE, BALANCE,
LOUDNESS controls and SUBSONIC
FILTER switch (AX-590 only) does not
affect the tone.
The remote control transmitter does not
work.
The distance or range within which the
remote control transmitter can be used
decreases.
CAUSE
Power cord is not plugged in or is not
completely inserted.
Incorrect output cord connections.
Appropriate input source is not selected.
The SPEAKERS switches are not set
properly.
Speaker connections are not secure.
The protection circuit has functioned because
of short circuit etc.
Incorrect setting of the BALANCE control.
Incorrect cord connections.
The + and – wires are connected in reverse
at the amplifier or speakers.
Incorrect cord connections.
No connection from the turntable to the GND
terminal.
The LOUDNESS control is functioning.
The PHONO (MM/MC) switch on the rear of
this unit is set to the improper position.
The CD DIRECT AMP switch is ON.
The CD DIRECT AMP or PURE DIRECT
switch is ON.
Direct sunlight or lighting (of an inverter type
of flourescent lamp etc.) is striking the
remote control sensor of the main unit.
The batteries of this remote control
transmitter are too weak.
REMEDY
Firmly plug in the power cord.
Connect the cords properly. If the problem
persists, the cords may be defective.
Select an appropriate input source with the
INPUT selector.
Set the SPEAKERS switch which
corresponds to the speakers to be used to
the ON position.
Secure the connections.
Turning the unit off and then on will reset the
protection circuit.
Adjust it to the appropriate position.
Connect the cords properly. If the problem
persists, the cords may be defective.
Connect the speaker wires in the correct
phase (+ and –).
Firmly connect the audio plugs. If the
problem persists, the cords may be
defective.
Make the GND connection between the
turntable and this unit.
Set the LOUDNESS control to the FLAT
position.
Reset the PHONO (MM/MC) switch to the
proper position.
Switch off the CD DIRECT AMP switch.
The CD DIRECT AMP and PURE DIRECT
switches must be switched OFF to use those
controls.
Change position of the main unit.
Replace the batteries with new ones.
13

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This manual also for:

Ax-590

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