Yamaha DVD-S557 Owner's Manual page 31

Problem
The player does not respond to
the Remote Control
Buttons do not work
Player does not respond to
some operating commands
during playback
DVD Player cannot read CDs/
DVDs
Menu items cannot be selected
Unable to play DivX movies
Unable to select Progressive
Scan on/off
No sound during DivX movies
playback
Solution
– Aim the Remote Control directly at the sensor on the front
of the player.
– Reduce the distance to the player.
– Replace the batteries in the Remote Control.
– Re-insert the batteries with their polarities (+/– signs) as
indicated.
– To completely reset the player, unplug the AC cord from
the AC outlet for 5-10 seconds.
– Operations may not be permitted by the disc. Refer to the
instructions of the disc jacket.
– Use a commonly available cleaning CD/DVD to clean the
lens before sending the DVD Player for repair.
– Press STOP twice before selecting System Menu.
– Depending on the disc availability, some menu items cannot
be selected.
– Check that the DivX file is encoded in 'Home Theater'
mode with DivX 5.x encoder.
– Check that the output of the video signal is switch to 'YUV'.
– The audio code may not be supported by the DVD player.
Troubleshooting
29