Audio Fail; Headset Fail - Motorola C168 Manual

1.1.3 Audio Fail

1.1.3.1 Headset Fail

Earphone doesn't work
Insert Earphone and
check if handset mode
is detected
YES
Measure AC Signal of
L101 ( R ) & L106 ( L )
YES
Measure Signal
(Microphone) of L102
YES
Measure Signal
(EP_status) of R112
Defective U201
NO
Check R112 if any level
NO Check U102_PIN6 if
any level change
Check AC signal at
Check AC signal at
U105 Pin10, 11 (input)
& Pin 14, 15 (output)
Check U104 Pin 4 & 8
if any level change
Check AC signal at U104
Pin3(COM1), 2(NO), 5(NC)
Pin9(COM2), 10(NO), 7(NC)
If Pin 5 is abnormal, then Defective U202
If Pin 2 is abnormal, then Defective U702
NO
Check J102 are well
Check if Earpiece is
plugged in well
NO Check J102_PIN4 if any
YES
Defective U201,U202
Fault Finding Chart of "Headset fail"
Defective J102
YES
NO
change
NO
YES
NO
U102 Pin 4?
NO
U105 is OK
NO
YES
NO
mounted
YES
NO
level change
Yes
Defective J102 or , R112
and R117,R118 are not
well mounted
Defective CALYPSO
U201
Defective U102
Defective U105
Defective U201
Defective U104
Defective J102
Defective J102 and L104
are not well mounted
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