ONKYO 9555 User Manual

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If you have any trouble using the A-9755/A-9555, look for a solution here. If you can’t resolve the issue yourself, 
contact your Onkyo dealer.

• Make sure that the power cord is properly plugged into the wall outlet. (page 5)
• Unplug the power cord from the wall outlet, wait ten seconds or more, then plug it in again.
• By default, pressing the remote controller’s [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-9755/A-9555 so that all 
components do turn on simultaneously (page 14).

• The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately and contact 

your Onkyo dealer.

• When the A-9755 is used as a power amplifier (MAIN IN indicator lights up), the sound from components connected 

to the preamp is output. To output the sound from a component that’s connected to the A-9755, or to use the A-9755 
as a preamp, press the [POWER AMP DIRECT (MAIN IN)] button for 3 seconds until the MAIN IN indicator goes 
off. (page 17)

• 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 10).

• Make sure that the correct input source is selected (page 15).
• If the Volume indicator flashes slowly, press the remote controller’s [MUTING] button to unmute the A-9755/A-9555 

(page 15).

• Make sure that none of the cables are bent, twisted, or damaged.
• To use a turntable with a moving-coil (MC) type cartridge, you need a commercially available MC phono preamp 

(page 11).

• If the Volume indicator flashes quickly, any speakers may not be connected to the A-9755/A-9555. Make sure that 

the required connection is performed appropriately, and set the [POWER] switch to the ON position again (pages 10, 
14).

• Verify if the SPEAKERS selector is configured correctly. If “OFF” is selected, no sound will be output from any of 

the speakers (page 14).

• 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.

• If the PURE DIRECT indicator lights up, the PURE DIRECT function is on and the tone controls have no effect. 

Press the [PURE DIRECT] button to turn the function off. The PURE DIRECT indicator will go off (page 16).

• Make sure that the batteries are installed with the correct polarity (page 5).
• Install new batteries. Don’t mix different types of batteries or old and new batteries (page 5).
• Make sure that the remote controller is not too far away from the A-9755/A-9555 and that there’s no obstruction 

between the remote controller and the A-9755/A-9555’s remote control sensor (page 9).

• Make sure that the A-9755/A-9555 is not subjected to direct sunshine or inverter-type florescent lights. Relocate if 

necessary (page 9).

• If the A-9755/A-9555 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).

• 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. (page 13)