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5. Troubleshooting
Problem
No power
Power is on, but no sound
Power is on, but sound is low
Sound is distorted
Unnatural sound
English
• Turn on power. Blue LED on front-panel will be visible when power is on.
• Make sure the power cord is plugged in.
• Try a different AC outlet that is working with another piece of equipment.
• Make sure the input source is turned on.
• Verify that there is an input signal from the source.
• Check the cable connections from the source to the amplifier.
• Ensure the desired source (A/B) is selected on the front panel.
• If a user interface is connected to the Remote connector on the rear panel, make
sure the desired source (A/B) is selected on user interface (user interface overrides
the front-panel source select).
• Make sure the Master Level control is turned up.
• If a user interface is connected to the Remote connector on the rear panel, make
sure the volume control on the user interface is turned up (user interface overrides
the front-panel Master Level control).
• Make sure a 1/8" (3.5 mm) TRS input cable is not connected to the Aux Input.
The Aux Input has a mechanical override feature so if an input cable is connected
to it the selected Input A/B source will be automatically overridden - even if the Aux
Input audio source is not playing or connected.
• If a contact closure is connected to the Mute connector on the rear panel, check the
switch to ensure the mute function has not been triggered.
• If a source is connected to the Page connector on the rear panel, make sure it has
not been triggered.
• Make sure loudspeakers are connected properly.
• Check that loudspeaker taps are set correctly.
• Check that the amplifier has adequate ventilation. Improper ventilation could cause
the amplifier to go into protection mode and no audio will be heard.
• Ensure that the output wiring is correct. A short circuit will cause the amplifier to go
into protection mode and no audio will be heard.
• Verify that the audio input source output is turned up to a nominal level.
• Check the cable connections from the source to the amplifier.
• Increase input level of source with Gain controls on amplifier. Turn Gain knob up until
you start seeing red Input Clip LED on front-panel. Then turn Gain down until red
LED Input Clip does not engage.
• Make sure Output Trim controls on amplifier are not turned down too much.
• If a user interface is connected to the Remote connector on the rear panel, make
sure the volume control on the user interface is turned up (user interface overrides
the front-panel Master Level control).
• Verify that the Input Clip red LED on the front-panel is not lit. If LED is red, reduce
the source output level or reduce the input gain.
• If the input source signal is clean, verify that the loudspeakers are not overdriven or
damaged. Check the loudspeaker tap setting.
• Verify that the proper EQ preset is selected for the loudspeakers being used.
Use HPF setting when using loudspeakers other than FreeSpace
loudspeakers.
• Check the Treble and Bass controls on the front-panels.
• Verify that the loudspeakers are wired correctly (+ to + and - to -).
Solution
Installation and Operating Guide
Troubleshooting
DS 16/DS 40
®
Page 33