Troubleshooting (For Sw-P40) - Yamaha NS-P400 Owner's Manual

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
Power is not supplied even though the
POWER switch is ON.
No sound.
Sound level is too low.
Automatic power ON function will not
work.
Automatic power OFF function will work
unexpectedly.
Automatic power ON function will work
unexpectedly.
16

TROUBLESHOOTING (for SW-P40)

The power plug is not securely connected.
The VOLUME control is set to 0.
Speaker cables are not connected securely.
Speaker cables are connected incorrectly.
A source sound with few bass frequencies is
played.
It is influenced by standing waves.
The POWER switch is turned off.
The level of input signal is too low.
The level of input signal is too low.
An influence of noise generated from
external digital equipment etc.
CAUSE REMEDY
Connect it securely.
Turn the VOLUME control to right.
Connect them securely.
Connect them correctly, that is to say L (left)
to L, R (right) to R, "+" to "+" and "–" to "–".
Play a source sound with bass frequencies.
Set the HIGH CUT control to a higher
position. (Turn the knob to right.)
Re-position the subwoofer or break up the
parallel surface by placing bookshelves etc.
along the walls.
Turn the POWER switch on.
Increase the level of input signal on the
source.
Increase the level of input signal on the
source.
Move this unit farther away from such
equipment and/or change the position of
connected speaker cables.
Otherwise, do not use the automatic power
ON function of this unit.