Operations Cannot Be Performed Through The Remote Control Unit - Denon AVR-X2400H Owner's Manual

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Operations cannot be performed through the remote control unit

Operations cannot be performed through the remote control unit.
Batteries are worn out. Replace with new batteries. (v p. 9)
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Operate the remote control unit within a distance of about 23 ft/7 m from this unit and at an angle of within 30°. (v p. 9)
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Remove any obstacle between this unit and the remote control unit.
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Insert the batteries in the proper direction, checking the q and w marks. (v p. 9)
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The set's remote control sensor is exposed to strong light (direct sunlight, inverter type fluorescent bulb light, etc.). Move the set to a place in which the
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remote control sensor will not be exposed to strong light.
The operation target zone does not correspond to the zone setting specified on the remote control unit. Press the MAIN or ZONE2 button to select the
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operating zone of the remote control. (v p. 139)
When using a 3D video device, the remote control unit of this unit may not function due to effects of infrared communications between units (such as TV
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and glasses for 3D viewing). In this case, adjust the direction of units with the 3D communications function and their distance to ensure they do not
affect operations from the remote control unit of this unit.
Display on this unit shows nothing
Display is off.
Set "Dimmer" on the menu to something other than "Off". (v p. 203)
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When the sound mode is set to "Pure Direct", the display is off. (v p. 113)
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Front panel Display
Playback Settings
216
Rear panel
Tips
Remote Index
Appendix