3.4 Fail to call
When call with somebody, we cannot hear what he says or he cannot hear what we say:
This fail may cause by receiver or microphone fail, should to check mic or receiver
problem
，
if ok, it may RF fail, if fail, we need to make sure is receiver or microphone fail.
Call 112, if cannot hear voice, it may receiver problem, check receiver related circuit ,check
B1240, B1620 ,
C1249,
C1250,
C1251,
V1240,
V1241 solder ok or not, if all ok, change a new
receiver, also fail, check CPU, re-hot U200 or change a new one.
Call 112, if can hear voice, it may microphone problem, change a new microphone check
C1633, C1634, C1635, B1642, B1643 ok or not, if not ok, check CPU, re-hot U200 or change
a new one.
Voice sending or receiving
no function
Check receiver and
mic ok or not?
Check RF
Check
Receiver
or MIC
Hot or change
new one
Y
N
Receiver
Y
N
Y
Check
Related
R,
C,
TVS?
Check
U200?
Change
new
Check
a
new one
Rework
uncorrected
component
N
N
Hot or change
new one
Check
Related
R C TVS?
Check
U200?
Change
new
Change a
new one
Rework
uncorrected
component
MIC
Y
N
N
Y
N
Y
