My center speaker of Sony dav- dz280 is not playing

[abu_gas]

All the four speakers play without the center speaker

 

[americanaudiophile]

Check the settings in the main unit to make sure the center is turned on.
You need to determine if the speaker is bad or the main unit is bad. Connect the center speaker to one of the front speaker connections. If it works then the problem is in the main unit. If it doesn't work then the speaker is blown.