Table of Contents
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Earphone sending path problem
3
No
Level of pin4 at CON402
is more than 2.0V
Yes
No
Level of C266 is
About a few tens
or hundreds mVAC?
Yes
Earphone receiving path problem
2
Signwave appear
at pin1 of U303 &U304
Yes
Signwave appear
at R413 and R414?
Yes
Signwave appear at
pin2 and 3 of CON402?
Yes
4
Re-solder
R412, R415
Re-solder
C266
No
Change main board
Level of pin6 of
No
U303&U304 is Low?
(High: FM Mode)
No
Re-download S/W
No
Check the receiving path from U303&304 to CON402
No
Re-download
Does it work well?
software
Yes
Does it work well?
Yes
4
Replace QSC
Yes
Check the condition of U303&304
If problem, replace the U303&304
No
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