Only For Training And Service Purposes - LG GB220 Service Manual

4. TROUBLE SHOOTING
CHECKING FLOW
START
Resolder CN200
Check the
pin(#8) in CN300 is LOW?
YES
Is R310(JACK DETECT)
LOW?
YES
Set the audio part of the test
equipment to PRBS or
Continuous wave mode
Can you hear
the sound from
the earphone?
YES
Set the audio part of the test
Equipment to echo mode
Can you hear your
voice from
the earphone?
Earphone will work properly
LGE Internal Use Only
LGE Internal Use Only
NO
Resolder pin8 in CN300
NO
Resolder R310
NO
Change the earphone
and try again
NO
Change the earphone
and try again
Can you hear NO
the sound from
the earphone?
YES
NO
Can you hear your
voice from
the earphone?
YES
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

- 92 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Resolder R305,R324,L302,L303
C202,C204(Call)
or
Resolder R305,R324,L302,L303,
C206,C208 (Mp3)
Resolder L301,R301,R300,
C302,C303
or
Change the U101
Only for training and service purposes