Troubleshooting and maintenance guide

.     .
.        .      
.            
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
  .
.         
  .
:             
  )  (      .
   
         .      
     ) .        
      (.
.          .
.
        )     USB.(
   
               
     .
.            
.
.         )  ( 

    .
.      .
       


   :
.               
.
.     .
.


         ) .(
.     

      .
   )  (
:                 
    .
               
    .
     :
.    .  ""        
     "" .  ""  " ."
.      .
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  