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Troubleshooting
If you have any trouble using the A-933, look for a solution here. If you can’t resolve the issue yourself, contact your
Onkyo dealer.
Can’t turn on the A-933.
• Make sure that the power cord is properly plugged into the wall outlet.
• Unplug the power cord from the wall outlet, wait five seconds or more, then plug it in again.
• By default, pressing the A-933’s [STANDBY/ON] button once does not turn on all of the system components. You
need to press the remote controller’s [ON] button again. Alternatively, you can set the A-933 so that all components
do turn on simultaneously (page 17).
The STANDBY indicator is flashing red.
• The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately and contact
your Onkyo dealer.
There’s no sound or it’s very quiet.
• When the A-933 is used as a power amplifier (MAIN IN indicator lights up blue), the sound from components con-
nected to the preamp are output. To output the sound from a component that’s connected to the A-933, or to use the
A-933 as a preamp, press the [MAIN IN] button for 3 seconds until the MAIN IN indicator goes off.
• Make sure that all audio plugs are pushed in all the way (page 11).
• Make sure that the inputs and outputs of all components are connected properly.
• Make sure that the polarity of the speaker cables is correct and that the bare wires are in contact with the metal part
of each speaker terminal (page 12).
• Make sure that the correct input source is selected (page 17).
• If the STANDBY indicator is flashing green, press the remote controller’s [MUTING] button to unmute the A-933
(page 18).
• Make sure that none of the cables are bent, twisted, or damaged.
• Make sure that SPEAKERS A or B are selected. When only SPEAKERS A is selected (A indicator on), speakers
connected to the SPEAKERS A terminals, and a connected subwoofer will output sound. When only SPEAKERS B
is selected (B indicator on), speakers connected to the SPEAKERS B terminals, and a connected subwoofer will
output sound.
•To use a turntable with a moving-coil (MC) type cartridge, you need a commercially available MC phono preamp
(page 15).
Noise can be heard.
• Using cable ties to bundle audio cables with power cords, speaker cables, and so on may degrade the audio perfor-
mance, so don’t bundle them together.
• An audio cable may be picking up interference. Try repositioning your cables.
The tone controls don’t work.
• If the TONE/DIRECT indicator is green, Direct mode is selected and the tone controls have no effect. Press the
[TONE/DIRECT] button to select Tone mode. The TONE/DIRECT indicator will turn red (page 18).
The remote controller doesn’t work.
• Make sure that the batteries are installed with the correct polarity (page 9).
• Install new batteries. Don’t mix different types of batteries or old and new batteries (page 9).
• Make sure that the remote controller is not too far away from the A-933 and that there’s no obstruction between the
remote controller and the A-933’s remote control sensor (page 9).
• Make sure that the A-933 is not subjected to direct sunshine or inverter-type florescent lights. Relocate if necessary
(page 9).
• If the A-933 is installed in a rack or cabinet with colored glass doors, the remote controller may not work reliably
when the doors are closed (page 9).
Can’t control other components?
• If it’s an Onkyo component, make sure that the cable and analog audio cable are connected properly. Connecting
only an cable won’t work.
Power
Audio
Remote Controller