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Troubleshooting guide
If a problem occurs while you are using the remote controller, first
try to operate the controls on the front panel of the TX-DS787 to
make sure that it is not due to a malfunction (or worn out batteries)
in the remote controller.
POWER
Power shuts off immediately after power on.
• Amplifier protection circuitry has been activated.
➞ Remove the power cord from outlet immediately. Contact
your Onkyo service center.
No power.
• Power cord is disconnected.
➞ Connect power cord.
• External noise in the affecting the internal microcomputer.
➞ Turn the power button off and then on again or remove the
power cord from the outlet and then plug it in again.
• Internal fuse is blown.
➞ Contact your Onkyo Service Center.
Power turns on but no sound.
•“Muting” is displayed.
➞ Press the MUTING button on the remote controller to turn
it off.
• Bad connections or wiring.
➞ Check connections, speaker cables, etc.
• Amplifier protection circuitry has been activated.
➞ Contact your Onkyo Service Center.
The sound of the playback source is not heard.
• Input selector is not set properly.
➞ Set to correct input source.
• Headphones are connected.
➞ Lower volume and then disconnect headphones.
SPEAKERS
No sound from the center speaker, or at very low
volume.
• Speaker cable is not connected.
➞ Check the connection between the amplifier and the
speaker.
• Listening mode is set to Stereo or Direct.
➞ Set the Listening mode to any mode other than Stereo or
Direct. The output to the center speaker may differ
depending on the listening mode.
• CENTER level is set to minimum.
➞ Set the CENTER level to the appropriate volume (page
32).
• CENTER SPEAKER is set to “None.”
➞ Set CENTER SPEAKER to “Large” or “Small” (page 30).
No sound or very low volume from subwoofer.
• Subwoofer is set to “No.”
➞ Check the speaker setting (page 30).
• Subwoofer speakers output level setting is improper.
➞ Check the output level of the Subwoofer using the test
tone.
Low frequency humming is heard.
• Not properly grounded.
➞ Check outer conductor of input plugs.
• Turntable motor is not properly grounded.
➞ Check for proper ground connection.
• Audio connection cables on the rear panel are connected
incorrectly.
➞ Adjust the placement of the cable to reduce hum.
Howling is heard when the volume is turned up.
• Turntable and speakers are located too close together.
➞ Move them farther apart.
Rough or scratchy sound is heard. High range is
not clear.
• The needles of turntable is dirty or worn, or a problem exists
with a connected component.
➞ Refer to the instruction of the connected components and
check for problem.
• Treble control too high.
➞ Turn treble down.
No sound is output from the surround back
speakers.
• The setting for the surround back speakers does not match the
actual configuration.
➞ Check the Surr Back Out setting (OSD MenuSpeaker
Setup → Speaker Config). If one surround back speaker is
connected, select “1 ch,” and if two surround back
speakers are connected, select “2 ch” (page 30).