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4.13 Ear Jack Trouble
4.13 Ear Jack Trouble
SETTING : After Initialize Agilent 8960, Test in EGSM, DCS Mode
START
Inset the earphone
to the phone
Does the audio profile of the
phone change to the earphone
mode?
Yes
Set the audio part of the test
equipment to echo mode.
Yes
Can you
hear your voice from the
earphone?
Yes
Earphone will work
properly
No
voltage at pin1 of
U204 = 2.8V?
Yes
Download
S/W
No
Change the earphone
and try again
Can you hear your voice
from the earphone?
Yes
Yes
No
Voltage at
Re-soldering
C224=~1.6V
Yes
No
Voltage at pin4
Re-soldering
of U203=~1V
Yes
No
Check soldering
Re-soldering
of R226,C228
R226,C228
Yes
Replace
main board
No
Check the
soldering U204
Yes
Re-soldering
U204
No
Set the audio part of test
equipment to PRBS or
continuous wave mode
Can you hear your voice
from the earphone?
C227=~1.2V
Check soldering
C227,R224,J200
U301
main board
R219
- 65 -
4. TROUBLE SHOOTING
No
No
Check the
Replace
soldering J200
Yes
Re-soldering
U204
No
No
voltage at
Download
Yes
Not good
C227,R224,J200
Yes
Replace
U204
S/W
Re-solder
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