Yamaha AS1000 - Amplifier, Owner'S Manual, Page: 24 / 212

24
En
Troubleshooting
Refer to the chart below if this unit does not function properly. If the problem you are experiencing is not listed below or
if the instructions below do not help, turn off this unit, disconnect the power cable, and contact the nearest authorized
Yamaha dealer or service center.
Problem Cause Remedy
See
page
This unit fails to turn
on.
The power cable is not connected to the
AC IN inlet on the rear panel or not
plugged in the AC wall outlet. Connect the power cable firmly.
17
The protection circuitry has been activated
because of a short circuit, etc. Check that the speaker wires are not touching each
other or shorting out against the rear panel of this
unit, and then turn the power of this unit back on.
14
This unit has been exposed to a strong
external electric shock (such as lightning
or strong static electricity). Turn off this unit, disconnect the power cable, plug it
back in after 30 seconds, and then use it normally.
—
The POWER indicator
on the front panel
flashes.
The protection circuitry has been activated
because of a short circuit, etc. Check that the speaker wires are not touching each
other or shorting out against the rear panel of this
unit, and then turn the power of this unit back on.
14
There is a problem with the internal
circuitries of this unit. Disconnect the power cable and contact the nearest
authorized Yamaha dealer or service center.
—
The INPUT indicator
on the front panel
flashes and the
volume is turned
down when you turn
on this unit.
The protection circuitry has been activated
because of a short circuit, etc. Check that the speaker wires are not touching each
other or shorting out against the rear panel of this
unit, and then turn the power of this unit back on.
14
No sound.
Incorrect input or output cable
connections. Connect the cables properly. If the problem persists,
the cables may be defective.
14
No appropriate input source has been
selected. Select an appropriate input source with the INPUT
selector on the front panel (or one of the input
selector buttons on the remote control).
9, 12
The SPEAKERS switch is not set
properly. Switch the SPEAKERS switch to the appropriate
position.
7
Speaker connections are not secure. Secure the connections. 14
The sound suddenly
goes off.
The protection circuitry has been activated
because of a short circuit, etc. Check that the speaker wires are not touching each
other or shorting out against the rear panel of this
unit, and then turn the power of this unit back on.
14
Only the speaker on
one side can be
heard.
Incorrect cable connections. Connect the cables properly. If the problem persists,
the cables may be defective.
14
Incorrect setting for the BALANCE
control. Set the BALANCE control to the appropriate
position.
8
There is a lack of bass
and no ambience.
The + and – wires are connected in
reverse at the amplifier or the speakers. Connect the speaker wires to the c and –
phase.
14
A “humming” sound
is heard.
Incorrect cable connections. Connect the audio cable plugs firmly. If the problem
persists, the cables may be defective.
14
No connection from the turntable to the
GND terminal. Connect the turntable to the GND terminal of this
unit.
14