4. TROUBLE SHOOTING
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Only for training and service purposes
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ʹΠΡΪΣΚΘΙΥ͑ι ͣͨ͑͡͡ͽ͑ͶΝΖΔΥΣΠΟΚΔΤ͑͟ͺΟΔ͑͑͟ͲΝΝ͑ΣΚΘΙΥ͑ΣΖΤΖΣΧΖΕ͑͟
ΟΝΪ͑ΗΠΣ͑ΥΣΒΚΟΚΟΘ͑ΒΟΕ͑ΤΖΣΧΚΔΖ͑ΡΦΣΡΠΤΖΤ
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
80/110
START
Is TP2 / TP3
Signal check?
NO
YES
Resolder CN201
YES
Earphone will work properly
Can you hear your
voice from
the earphone?
Set the audio part of the test
Equipment to echo mode
Change the earphone
and try again
NO
Can you hear
the sound from
the earphone?
Set the audio part of the test
equipment to PRBS or
Continuous wave mode
YES
YES
Resolder TP1 (pin4) of CN201
CHECKING FLOW
Replace the U203
NO
YES
Can you hear
the sound from
the earphone?
NO
Change the earphone
and try again
NO
Can you hear your
voice from
the earphone?
NO
Resolder TP2,TP3,U203
TP4,TP5 (Call)
or
ResolderTP6,TP7
or
Change the U203,U101
4. TROUBLE SHOOTING
Check the TP1
pin(#4) of CN201 is LOW?
U101
ʹΠΡΪΣΚΘΙΥ͑ι ͣͨ͑͡͡ͽ͑ͶΝΖΔΥΣΠΟΚΔΤ͑͟ͺΟΔ͑͑͟ͲΝΝ͑ΣΚΘΙΥ͑ΣΖΤΖΣΧΖΕ͑͟
ΟΝΪ͑ΗΠΣ͑ΥΣΒΚΟΚΟΘ͑ΒΟΕ͑ΤΖΣΧΚΔΖ͑ΡΦΣΡΠΤΖΤ
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
80/110
START
Is TP2 / TP3
Signal check?
NO
YES
Resolder CN201
YES
Earphone will work properly
Can you hear your
voice from
the earphone?
Set the audio part of the test
Equipment to echo mode
Change the earphone
and try again
NO
Can you hear
the sound from
the earphone?
Set the audio part of the test
equipment to PRBS or
Continuous wave mode
YES
YES
Resolder TP1 (pin4) of CN201
CHECKING FLOW
Replace the U203
NO
YES
Can you hear
the sound from
the earphone?
NO
Change the earphone
and try again
NO
Can you hear your
voice from
the earphone?
NO
Resolder TP2,TP3,U203
TP4,TP5 (Call)
or
ResolderTP6,TP7
or
Change the U203,U101
4. TROUBLE SHOOTING
Check the TP1
pin(#4) of CN201 is LOW?
U101