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6-4
SGH-S300 Flow Chart of Troubleshooting and Circuit Diagram s
5. M icrophone Part
6. Speaker Part
C heck the reference
voltage on m ic path
C418 =2.5V
Reassem blage m icrophone
N O
resolder or change
C 400,R 428,R 409,R 405,R 406)
N O
C heck U 700
N O
YES
YES
M icrophone does not w ork
EN D
YES
C heck the assem bled
status of m icrophone.
Is m icrophone ok?
Resolder and check the board
to board connector
N O
C heck U 601
N O
C hange or resolder
U 700, R201, R202
N O
YES
YES
YES
Speaker does not w ork
EN D
C heck the connection
status spk to CN 200
Check the PIN 1 of
U 402 = 'H igh' ?
C heck U 700, R 201, R 202
Is speaker ok?
YES
Change Speaker
N O