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CHECKING FLOW
MIDI Trouble
Play MIDI
Check the voltage level
of U200.9 = 2.8V?,
U200.10 = 1.8V?
Yes
Check the Signal of
U203.G5 = 26MHz?
Yes
Check the Signal,
U203.B5 and U203.A4,
U203.B7, U203.B8.
Yes
Check the Level of
U404.C2 = Low ?
Yes
Check the Signal,
U404.A2 and U404.C2
Yes
Check the connection
and Solder condition
of CN700 and CN101
Yes
Check the condition of
Main FPCB.
Yes
Check the Connection,
CN102(Key)
Yes
Try again
or Change the Board
No
Re-Place
U200
No
Re-solder
C209
No
Re-Place
U203
No
Re-solder
R429
No
Re-Place
U404
No
Re-solder or
Reassemble
CN700 or CN101
No
Replace
Main FPCB
Re-
No
Assemble or
Re-place
Speaker
Figure 4-81.
- 121 -
4. TROUBLE SHOOTING
MP3 Trouble
Play MP3
No
Check the voltage level
of U602.4 = 2.8V?,
Yes
No
Check the solder
condition of R710 ~
R715
Yes
No
Check the Signal,
U700.11 and U700.12
Yes
No
Check the Level of
U400.A1 = High ?
Yes
Check the solder
No
condition of R414, R415,
R417, R418, C410, C411,
C420, C421, L400, L401
Yes
No
Check the Signal,
U400.A4 and U400.D4
Yes
No
Check the Level of
U404.C2 = High ?
Yes
Re-Place U602
or Re-solder
FB603
Re-solder
R710 ~
R715
Re-Place
U700
Re-solder
R420
Re-solder
The
components
Re-Place
U400
Re-solder
R429
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