C903
1228-1147 rev. 1
TROUBLESHOOTING
Loudspeaker Problems
T
R
O
UBL
ESHOOT
ING
- Handsfree Aux Earphone Problems
START
Step 1:
Replace Rear Cover Assy and retest the Phone
If successful claim Rear Cover 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
Continue with the
Earphone Problems TRS guide
1:
Use Fault Trace SW and go to:
Audio and FM Radio
Audio Tone
Activate:
INIT TONE TEST
Activate:
Loudspeaker
Can you
hear a 1 kHz tone
from the TRS Fixture
Loudspeaker
Replace
X3102
Yes
No
No
Is
any of MP 24
(TP3102) or MP 23
(TP3103) Short Circuit to
GND (
Measure on the TRS
Fixture
)
Yes
No
1.8 Volt DC
at MP 49 (R3153)
SL 4 Replace
N3100
SL 5 Replace
C3107 or C3108
Yes
SL 4 Replace
N2410
SL 5 Replace
N2010
Disconnect:
VBATT and DCIO/SEPI
Remove the PBA from the TRS Fixture
SL 4 Replace
N3100
SL 5 Replace
N2000
Are
L3110 and L3111
= Max 1 Ohm
SL 5 Replace
L3110 or L3111
SL 4 Escalate
No
Yes
Loudspeaker Problems
START
Note !
Before starting check if the Hands-Free (PHF) Connection is Ok.
Step 1:
Perform the
System Connector Protection Test
If successful go to step 2.
Step 2:
Load ETS SW into the Phone
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
Use Hands-Free (PHF) Set
Continue with the
Hands-Free (PHF) Aux Earphone Problems TRS guide
1:
Use Fault Trace SW and go to:
Audio and FM Radio
Audio Tone
Activate:
INIT TONE TEST
Activate:
PHF Earphone
2:
Disconnect: DCIO/SEPI from the PBA
3:
Connect the PHF set to the PBA
Can you
hear the 1 kHz tone
In the PHF
Earphone
Go to
Hands-Free (PHF)
Aux Microphone
Problems TRS guide
Yes
No
More than
400mV AC Pk-Pk
1 kHz signal at MP 82
(C3149) and
MP 81 (C3150)
No
Yes
Disconnect VBATT and PHF Set and
Remove PBA from the TRS Fixture
Are
L2403, L2404,
= Max 2 Ohm
Replace
L2403 or L2404,
No
Is any of
C2447 or C2448
Short Circuit
SL 5 Replace
C2447 or C2448
SL 4 Escalate
No
Yes
SL 5 Replace
X2405
SL 4 Escalate
Yes
Yes
More than
300mV AC Pk-Pk
1 kHz signal at MP 12
(L2403) and
MP 13 (L2404)
SL 5 Replace
N2000 or N2010
SL 4 Escalate
No
Replace
L2406
No
Yes
Is L2406
= Max 1 Ohm
SL 4 Replace
N3101
SL 5 Replace
N2000 or N2010
Hands-Free (PHF) Aux Earphone Problems
SEMC Troubleshooting Manual
25
(129)