Earphone Part - Samsung SGH-Z720M Service Manual

Flow Chart of Troubleshooting

9-7. Earphone Part

Earphone does not work
C535, C538 ≥ 100mV?
(When MP3 file is played)
U501 pin 1A, 2A ≥ 100mV?
(When MP3 file is played)
U500 pin 5, 6 ≥ 200mV?
(When MP3 file is played)
Check the circuit
from IFC600 pin 5, 6, 7
IFC600 pin 5, 7 short?
Is Earphone working?
Yes
Yes
Yes
Yes
to U500
OK
Yes
Yes
END
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No
Check UCP300
No
Resolder U501, C535, C538
No
Not OK
Resolder L600, L601, L602
No
Resolder IFC600
No
Replace the Earphone
9-12
Resolder U500