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5-10
SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram
5-10 SGH-A400 Alert Tone
Abnormal Alert tone
Y
N
Y
Is there
alert wave signal on the
R635 during alert tone
test?
ALERT by Test S/W
N
Y
Is there
alert wave signal on the
Q603 pin3 during alert
tone test?
Check the circuit related to Q603
N
Y
Check the C620
≥
3.3V
Resolder D601 and C620
N
Y
Buzzer is ok?
Change the Buzzer
END