CAUT ION: D O NO T REM OVE BACK OR CO VER OF UNIT DU E TO T HE POSSIB ILITY OF ELECTRICAL SHO CK. T HERE ARE NO USER SE RVICEABL E PAR TS INSIDE T HIS U NIT. P LEAS E REFER SERVICING TO QUAL IFIED SERV ICE PE RSON NEL. The lightnin g flash with a rrowhead sy mbol within an equilatera l triangle is instend to alert the user to the presenc e of uninsultated "dangerous voltage" wit hin the products enclosure that may be of sufficien t magnitude to constitute risk of electric shock to persons.