NEC Multi Sync EA221WM Service Manual page 19

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2.10 Audible defect (No sound or Noise etc.)
Audible defect
(No sound or Noise etc.)
Check the position of sound
volume or mute function.
Check connections of AUDIO
PWB or MAIN PWB or SPEAKER.
Replace the AUDIO PWB.
Replace the MAIN PWB.
Replace the SPEAKER.
NG
OK
NG
NG
OK
End
OK
NG
The cable connector is inserted.
OK
OK
2-10

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