Samsung SGH-E700 Service Manual page 32

SGH-E700 Flow Chart of Troubleshooting
6. Speaker Part(Melody)
Speaker does not work
Yes
U300 pin 5 = 2.85V?
Yes
Check the Clock signal
at Pin 1 of U301
(13MHz)
Yes
U301 pin 17,18 1.8V?
≒ ≒
(When U301 operate)
Yes
HDC700 pin 40,42
1.8V?
≒ ≒
Yes
Is Speaker working?
Yes
END
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No
No
Check the clock generation circuit
(related to OSC100 and U300)
No
No
No
10
7-
Resolder or replace U300
Resolder U301
Check the circuit related to
"SPK_P/SPK_N" signal
Change the Speaker