C903
1228-1147 rev. 1
TROUBLESHOOTING
Microphone Problems
T
R
O
UBL
ESHOOT
ING
- Earphone Problems
START
Step 1:
Load ETS SW into the Phone
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
Step 2:
Continue with the
Microphone Problems TRS guide
Use Fault Trace SW and go to:
Audio and FM Radio
Audio Loop Test
Audio Input:
Mic1
Loop Mode:
Analog
Audio Output:
Loudspeaker
Apply Audio Loop
2.2 Volt DC at
MP 115 (R3119)
No
SL 5 Replace
N2000
SL 4 Escalate
Yes
Replace
B3100
Microphone Problems
START
Step 1:
Replace Main Flex Assy and retest the Phone
If successful claim Main Flex Assy
If not go to step 2.
Step 2:
Load ETS SW into the Phone
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
1:
Use Fault Trace SW and go to:
Audio and FM Radio
Audio Tone
Activate:
INIT TONE TEST
Activate:
Earphone
SL 5 Replace
N2000
SL 4 Escalate
Replace
X4202
Yes
No
More than
400mV AC Pk-Pk
1 kHz signal at MP 21
(TP3104) and MP 22
(TP3105)
Earphone Problems
SEMC Troubleshooting Manual
24
(129)