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36 - English
pro.Bose.com
Technical Information
Troubleshooting
Problem What to do
No power • 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.
Power is on, but no
sound
• 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 INPUT connector on the rear panel, make sure it has not been triggered.
• Make sure loudspeakers are connected properly.
• Make sure that loudspeaker taps are set correctly. See “Loudspeaker usage” on page 33.
• 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.
Power is on, but
sound is low
• 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 clockwise until you start
seeing a red INPUT SIGNAL CLIP LED on front-panel. Then turn GAIN counter-clockwise until the LED
turns green.
• Make sure OUTPUT TRIM controls on amplifier are not turned down too low.
• 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 that loudspeaker taps are set correctly. See “Loudspeaker usage” on page 33.
Sound is distorted
• Verify that the INPUT SIGNAL CLIP LED on the front-panel is not red. If it 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.
Unnatural sound • Verify that the proper EQ preset is selected for the loudspeakers being used. With the IZA 2120-HZ, use
the HPF setting for loudspeakers other than FreeSpace
®
loudspeakers and those that have their own EQ
settings.
• Check the TREBLE and BASS controls on the front-panels.
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