Samsung SGH-Z140 Service Manual page 32

Flow Chart of Troubleshooting
7-4. Speaker Part(Melody)
Speaker does not work
Yes
U607 pin7,32 = 2.8V?
Yes
Check the Clock signal
at Pin 1 of U607
(13.5MHz)
Yes
U607 pin 4 ≒ 2.8V?
(When U302 operate)
Yes
U607 pin 15
≒ Battery Volt ?
Yes
Is Speaker working?
Yes
END
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No
Resolder or replace U500
No
Check the clock generation circuit
(related to U500 and U607)
No
No
Check the circuit related to
No
7-8
Resolder U301
"SPOUT1/SPOUT2" signal
Change the Speaker