Bose Professional FreeSpace IZA 190-HZ Guide D'installation Et D'utilisation page 34

Troubleshooting
Troubleshooting
Problem
No power
Power is on, but no sound
Power is on, but sound is low
Sound is distorted
Unnatural sound
Page 34 Installation and Operation
• 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 (IZA 190-HZ) or FLAT (IZA 250-LZ) setting when using loudspeakers other than
FreeSpace FS2C/SE/P or FS4CE/SE loudspeakers�
®
• Check the Treble and Bass controls on the front-panels�
• Verify that the loudspeakers are wired correctly (+ to + and - to -)�
Solution
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