Samsung SGH-Z500 Anycall Service Manual page 43

4. Speaker Part (Melody)
Speaker does not work
Yes
U502 pin7,32 = 2.8V?
Yes
Check the Clock signal at
Pin 1 of U502 (13.5MHz)
Yes
U502 pin 4 ¡Ö 2.8V?
(When U302 operate)
Yes
U502 pin 15
¡Ö Battery Volt ?
Yes
Is Speaker working?
Yes
END
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No
Resolder or replace U401
No
Check the clock generation circuit
(related to U401 and U502)
No
No
Check the circuit related to
"SPOUT1/SPOUT2" signal
No
7- 9
F low Chart of Troubleshooting
Resolder U302
Change the Speaker