Audio Internal Problems; Audio External Problems - Sony Ericsson C702 Troubleshooting Manual

Audio Internal problems

Go to
Audio External
Yes
Problems
SL 4 Replace
0 Volt DC at
V2420
MP 109 No
SL 5 Replace
(V2420_Cathode)
R2440
Yes
0 Volt DC
at MP 23 (V2405_Pin Replace
No
3) and Access: Result V2405
GPIO_02=HIGH
Yes
2.6 Volt DC
Replace
at MP 22 No
N2400
(V2405_ Pin 5)
Yes
Yes
SL 5 Replace
1.8 Volt DC
No D2000
at MP 21 (R2435)
SL 4 Escalate
Fault Trace SW
Audio and FM Radio
Audio Loop test
Fault Trace SW
Audio Input: Mic1
Logic
Loop Mode: Analog
GPIO Manager
Audio Output: Loudspeaker
Access:
Apply Audio Loop
Set GPIO_03 to High
Whistle as close as possible
Application:
in the PBA Mic
Set GPIO_01 to High
Access
GPIO_02 Read
More than
100mVolt AC Pk-Pk at
Yes MP 54 (X3102) and MP 53
(X3103) when whistle in
SL 4 Replace the PBA Mic
V3105 or V3106
SL 5 Replace
C3137 or C3123
No
Yes
Are any of
1.9 Volt DC
V3105, V3106
No at MP 54 (X3102) and Yes
C3137 or C3123
MP 53 (X3103)
short circuit
No
1.9 Volt DC
at MP 56 (L3108) and No
MP 55 (L3109)
SL 5 Replace
Yes L3108 and L3109
SL 4 Escalate
TROUBLESHOOTING
START
Step1
SL 5 Replace
If Mic problem go to step 2.
V3101, V3102,
If Loudspeaker or Earphone problem
L3103 or L3104
replace Speaker Box or Earphone and
SL 4 Escalate
retest the phone. If successful claim
Speaker Box or Earphone
If not then go to step 2.
No
Step 2:
Perform
System Connector Protection Test.
If the test is pass go to step 2
More than
Step 3:
100m Volt AC Pk-Pk at
Load ITP SW into the phone.
MP 17 (X3100) and MP 16
Use TRS Fixture.
(X3101)
when blowing in the Connect VBATT and DCIO/SEPI
PBA Mic
and continue with the
Audio Internal Problems TRS guide
Yes
Fault Trace SW
Audio and FM Radio
Audio Loop test
More than
Audio Input: Mic1
100m Volt AC Pk-Pk
Loop Mode: Analog
at MP 14 (L3103 BEARP)
and MP 15 (L3104 BEARN) Audio Output:
when blowing in the PBA
Earphone
Mic
Apply Audio Loop
Blow into the
PBA Mic
No
More than
SL 5 Replace
100mVolt AC Pk-Pk
at MP 28 (R3132) when Yes N2000
blowing in the SL 4 Escalate
PBA Mic
No
2.2 Volt DC
Replace
at Yes
B3100
MP 27 (R3131)
No
Are any of SL 5 Replace
V3103 and V3104 Yes V3103 or V3104
Short circuit SL 4 Escalate
No
More than
100mVolt AC Pk-Pk
SL 5 Replace
at MP 35 (C3137) and MP
No N2000
36 (C3123) when whistle
SL 4 Escalate
in the PBA
Mic
Yes
1.8 Volt DC
Replace
at MP 18 (R3137 Yes
N3100
AMPCTRL)
SL 5 Replace
No D2000
SL 4 Escalate
Audio Internal Problems - Audio External Problems

Audio External problems

Disconnect
DCIO/SEPI cable
and Insert PHF set
Blow into the
AUX Mic
Can you
hear anything in
AUX earphone when
No
blowing into the
AUX Mic
More than
100mV AC Pk-Pk
Disconnect
At MP 104 (C2415 SPR)
Yes VBATT and
and MP 103 (C2416 SPL)
DCIO/SEPI
when blowing in to the
AUX mic
More than
100mV AC Pk-Pk
No
at MP 33 (C3124 MICP_int)
and MP 30 (C3125 MICN_int)
when blowing in to the
AUX mic
No
Is
MP 107
(X2300_Pin 10)
Connected to
MP 105 (L2401)
Yes
Is
MP 108
(X2300_Pin 9)
Connected to
MP 106 (L2402)
Yes
SEMC Troubleshooting Manual
START
Step 1:
Fault trace SW
Perform
Audio and FM Radio
System Connector Protection
Audio Loop Test
Test
Audio Input: AUX1
If the test is pass go to step 2
Loop Mode: Analog
Step 2:
Audio Output:
Load ITP SW into
AUX Earphone
the phone.
Apply Audio Loop
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and
continue with the Audio External
Problems TRS guide.
Go to
Audio Internal
Yes No Audio Internal
Tested
problems
Flash the phone
with
Yes
EMMA SUCR SW
Is
Replace
L2403 and L2404 No
L2403 or L2404
Max 2 Ohm
Replace
Yes System Connector
X2300
More than
SL 4 Replace
100mV AC Pk-Pk
C3113 and C3120
at MP 32 (C3113) and
Yes No
MP 29 (C3120) when SL 5 Replace
blowing in to the
N2000
AUX mic
Replace
Yes
N3101
L2401 Replace
No No
Ok L2401
Replace
Yes System Connector
X2300
L2402 Replace
No No
Ok L2402
Replace
Yes System Connector
X2300
2.2 Volt DC at Replace
Yes
MP 99 (C3169) N3101
SL 5 Replace
No N2000
SL 4 Escalate
1221-7857 rev. 1
C702
17 (115)