Yamaha RX-E600 Owner's Manual page 23

SYMPTOM
The remote control does not work.
TV functions strangely when the remote
control is being used.
CAUSE
The batteries of the remote control are too
weak.
Remote control is too far away or is being
used at an incorrect angle.
Direct sunlight or lighting (of an inverter type
of fluorescent lamp, etc.) is striking the
remote control sensor of the unit.
Remote control is being used near TV set
with a remote control sensor.
ADDITIONAL INFORMATION
REMEDY
Replace the batteries with new ones.
Use within 6 meters and 60 degree radius.
Change the position of the unit.
Relocate this unit away from the TV or cover the
TV's remote control sensor.
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