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Flow Chart of Troubleshooting
7-6
4. Microphone Part
U510 pin7,32 = 2.8V?
Speaker does not work
Check the Clock signal at
Pin 1 of U510 (13.5MHz)
Check the clock generation circuit
(related to U404 and U510)
END
No
Yes
No
Resolder or replace U768
U510 pin 4 ≒ 2.8V?
(When U509 operate)
Resolder U509
Yes
No
U510 pin 15
≒ Battery Volt ?
Check the circuit related to
"AMP+/AMP-" signal
Yes
No
Is Speaker working?
No
Yes
Change the Speaker
Yes
Yes
