[Premium-Rx] A TRUBLE OF WJ8178

[BG4AHZ]

Dear OMs:
=09I got a WJ8718A but it has some problem,does anyone could help=
 me?
the problem is: when i turn off the PHONE LEVEL I can hear some
continuous noise like "hen...hen...hen"(low frequence audio)=
 from
 headphone(sony MDR-7506) and another continuous noise like=
 "en..en...en..."
(high frequence audio) ONLY come from the right ear if I turn off=
 RF GAIN 
and turn on the PHONE LEVEL.that noise come from the powersupply=
 in the 
receiver? or there is something wrong in the AUDIO-AMP part? Can=
 you copy
 the schematic of AUDIOAMP for me,and tell me which board in the=
 case is AUDIO-AMP PART? 
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