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Flow Chart of Troubleshooting and Circuit Diagrams
3-15
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3-1-6. Speaker Part
Speaker dose not work
Check the pin #4,8 of U403 =
"High"
Check the R434,R435,C432,C438
Check the pin #1,13 of
U401 = "High"
Check the pin #4,6,16,18 of
U401
Check the L400,L401,L402,L403
END
Check the UCP201
Change the U403
Chande or Resolder
R434,R435,C432,C438
Check the UCP201
Change the U401
Change or Resolder
L400,L401,L402,L403
Check the LCD
module connection
Check the pin #2,10 of U403
Is Speaker O.K?
Change the LCD module
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO