Sony Ericsson C702, Troubleshooting Manual

Page: 17 / 116

C702
1221-7857 rev. 1
TROUBLESHOOTING Audio Internal Problems -
TROU
B
L
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S
H
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OTIN
G
Audio External Problems
Fault Trace SW
Audio and FM Radio
Audio Loop test
Audio Input: Mic1
Loop Mode: Analog
Audio Output:
Earphone
Apply Audio Loop
Blow into the
PBA Mic
SL 5 Replace
N2000
SL 4 Escalate
Yes
Replace
B3100
Yes
More than
100m Volt AC Pk-Pk
at MP 14 (L3103 BEARP)
and MP 15 (L3104 BEARN)
when blowing in the PBA
Mic
No
2.2 Volt DC
at
MP 27 (R3131)
No
More than
100mVolt AC Pk-Pk
at MP 28 (R3132) when
blowing in the
PBA Mic
Fault Trace SW
Audio and FM Radio
Audio Loop test
Audio Input: Mic1
Loop Mode: Analog
Audio Output: Loudspeaker
Apply Audio Loop
Whistle as close as possible
in the PBA Mic
More than
100mVolt AC Pk-Pk at
MP 54 (X3102) and MP 53
(X3103) when whistle in
the PBA Mic
Yes
No
No
SL 5 Replace
N2000
SL 4 Escalate
More than
100m Volt AC Pk-Pk at
MP 17 (X3100) and MP 16
(X3101)
when blowing in the
PBA Mic
Yes
No
SL 5 Replace
V3101, V3102,
L3103 or L3104
SL 4 Escalate
1.9 Volt DC
at MP 54 (X3102) and
MP 53 (X3103)
Yes
No
Go to
Audio External
Problems
No
Are any of
V3105, V3106
C3137 or C3123
short circuit
SL 4 Replace
V3105 or V3106
SL 5 Replace
C3137 or C3123
Replace
N3100
More than
100mVolt AC Pk-Pk
at MP 35 (C3137) and MP
36 (C3123) when whistle
in the PBA
Mic
No
Yes
1.9 Volt DC
at MP 56 (L3108) and
MP 55 (L3109)
No Yes
Yes
SL 5 Replace
D2000
SL 4 Escalate
1.8 Volt DC
at MP 18 (R3137
AMPCTRL)
Yes
No
No
0 Volt DC at
MP 109
(V2420_Cathode)
Yes
Replace
N2400
SL 5 Replace
L3108 and L3109
SL 4 Escalate
Replace
V2405
No
Are any of
V3103 and V3104
Short circuit
SL 5 Replace
V3103 or V3104
SL 4 Escalate
Yes
Fault Trace SW
Logic
GPIO Manager
Access:
Set GPIO_03 to High
Application:
Set GPIO_01 to High
Access
GPIO_02 Read
1.8 Volt DC
at MP 21 (R2435)
SL 5 Replace
D2000
SL 4 Escalate
No
2.6 Volt DC
at MP 22
(V2405_ Pin 5)
Yes
0 Volt DC
at MP 23 (V2405_Pin
3) and Access: Result
GPIO_02=HIGH
Yes
Yes
No
SL 4 Replace
V2420
SL 5 Replace
R2440
START
Step1
If Mic problem go to step 2.
If Loudspeaker or Earphone problem
replace Speaker Box or Earphone and
retest the phone. If successful claim
Speaker Box or Earphone
If not then go to step 2.
Step 2:
Perform
System Connector Protection Test.
If the test is pass go to step 2
Step 3:
Load ITP SW into the phone.
Use TRS Fixture.
Connect VBATT and DCIO/SEPI
and continue with the
Audio Internal Problems TRS guide
No
Yes
Audio Internal problems
START
Step 1:
Perform
System Connector Protection
Test
If the test is pass go to step 2
Step 2:
Load ITP SW into
the phone.
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and
continue with the Audio External
Problems TRS guide.
Fault trace SW
Audio and FM Radio
Audio Loop Test
Audio Input: AUX1
Loop Mode: Analog
Audio Output:
AUX Earphone
Apply Audio Loop
Replace
L2403 or L2404
Can you
hear anything in
AUX earphone when
blowing into the
AUX Mic
No
More than
100mV AC Pk-Pk
at MP 33 (C3124 MICP_int)
and MP 30 (C3125 MICN_int)
when blowing in to the
AUX mic
Yes
More than
100mV AC Pk-Pk
At MP 104 (C2415 SPR)
and MP 103 (C2416 SPL)
when blowing in to the
AUX mic
Is
L2403 and L2404
Max 2 Ohm
No
Yes
Replace
System Connector
X2300
Yes
No
Disconnect
DCIO/SEPI cable
and Insert PHF set
Blow into the
AUX Mic
Is
MP 108
(X2300_Pin 9)
Connected to
MP 106 (L2402)
No
Yes
Is
MP 107
(X2300_Pin 10)
Connected to
MP 105 (L2401)
No
Yes
No
Yes
Yes
L2401
Ok
Replace
L2401
L2402
Ok
Replace
L2402
No No
Yes
Audio Internal
Tested
Yes
No
More than
100mV AC Pk-Pk
at MP 32 (C3113) and
MP 29 (C3120) when
blowing in to the
AUX mic
Replace
N3101
Yes
SL 4 Replace
C3113 and C3120
SL 5 Replace
N2000
No
Replace
System Connector
X2300
Replace
N3101
2.2 Volt DC at
MP 99 (C3169)
Yes
SL 5 Replace
N2000
SL 4 Escalate
No
Replace
System Connector
X2300
Go to
Audio Internal
problems
Flash the phone
with
EMMA SUCR SW
Disconnect
VBATT and
DCIO/SEPI
Audio External problems
SEMC Troubleshooting Manual
17 (115)