Yamaha TSX-B237 Owner's Manual page 35

Problem
The unit's clock is reset.
Interference from nearby electronic equipment
is producing noise.
The remote control does not work or does not
function properly.
The touch sensors on the unit cannot be
operated.
Cause
Power has not been supplied to the unit for more than one week.
The unit is too close to other electronic equipment.
The remote control may be outside its operation range.
The remote control sensor on this unit may be exposed to direct
sunlight or strong lighting such as an inverter type fluorescent
lamp.
The battery may be worn out.
There are obstacles between the sensor of this unit and the
remote control.
The child lock function is enabled.
Objects have been placed on the touch sensors.
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Solution
If the power cord has been disconnected from the electrical outlet
for more than one week, the clock may be reset. Set the clock
again ( p. 10).
Position the unit farther away from other electronic equipment.
Operate the remote control within its operation range ( p. 9).
Change the orientation of lighting or the unit, or location of the
unit.
Replace the battery (CR2025) with a new one ( p. 8).
Remove the obstacles.
Disable the child lock function ( p. 29).
Do not place objects on the touch sensors.
Troubleshooting