C905
1222-9526 rev. 1
TROUBLESHOOTING
Loudspeaker Problems
TROU
B
L
E
S
H
O
OTIN
G
- Handsfree (PHF) Problems
START
Step 1:
Replace Loudspeaker Assembly
and retest the Phone
If successful claim Loudspeaker Assembly
If not go to step 2.
Step 2:
Load ITP SW into the Phone
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Signal Generator Instrument
Use Fault Trace SW and continue with the
Loudspeaker Problems TRS guide
Fault trace SW
Audio and FM Radio
FM Radio
Audio Output: Loudspeaker
Frequency: 103 MHz
Set FM Radio
Remove: DCIO/SEPI Cable
Connect: Customized FM Radio Cable
Black Lab Plug to TRS Fixture GND Input
and PHF Connector to the
Phone System Connector
Signal Generator
Instrument Settings:
Frequency: 103 MHz
Amplitude/Level: 50
μ
V
FM Dev: +/-22.5 kHz
FM Rate: 1kHz
2.6 Volt DC
at MP 125 (ST2201)
and MP 124 (ST2206)
SL 5 Replace
N2000
SL 4 Escalate
No
More than
40 mV AC Pk-PK
1 KHz signal at MP 1
(C3137) and MP 30
(C3148)
1.8 Volt DC
at MP 80 (R3153)
Yes
Replace
N3100 or N2410
No
Yes
SL 4 Replace
V3101 or N3100
SL 5 Replace
C3107 or C3108
Yes
No
No
Replace
N3100
Replace
X3102 or X3103
Yes
Is any of
X3102 or X3103
damaged
Yes
SL 4 Replace
N3100
SL 5 Replace
N2000
No
Is any of
MP 147 (V3101_Pin 1)
and MP 146 (V3101_Pin 2)
Short circuit to the PBA
GND (Shield Can
Fence)
1:
Disconnect:
Customized FM Radio Cable and VBATT
2:
Remove the PBA from the TRS Fixture
Is
L3108, L3109
L3110 and L3111
= Max 1 Ohm
SL 5 Replace
L3108, L3109
L3110 or L3111
SL 4 Escalate
No
Yes
Loudspeaker Problems
Fault trace SW
1:
Logic
GPIO Manager
Application
GPIO_Low
GPIO_17
(Set GPIO_17 to Low)
2:
Audio and FM Radio
Audio Loop Test
Audio Input: AUX1
Loop Mode: Analog
Audio Output:
AUX Earphone
Apply Audio Loop
START
Step 1:
Perform
System Connector Protection Test
If successful go to step 2.
Step 2:
Load ITP SW into the Phone
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
Remove the DCIO/SEPI cabel
and Insert Hands-Free (PHF) set
Blow into the
Hands-Free (PHF) Mic
Can you
hear anything at
PHF earphone when
blowing into the
PHF Mic
0 Volt DC
at MP 112
(V2417_Cathode)
Yes
Replace
R2448 or V2417
No
0 Volt DC
at MP 111 (R2478)
Yes
SL 5 Replace
R2478
SL 4 Escalate
No
2.6 Volt DC
at MP 110 (R2434)
Yes
Flash the Phone with
EMMA SUCR SW
Yes
1.8 Volt DC
at MP 3 (SP2432)
No
SL 5 Replace
N2010
SL 4 Escalate
No
Replace
N2422
Yes
2V – 2.2V DC at
MP 104 (R3156)
No
SL 5 Replace
N2000
SL 4 Escalate
No
More than
40 mV AC Pk-Pk
at MP 102 (C3124), MP 99
(C3125) MP 121 (C3155),
MP 98 (C3156) when blowing
into the PHF mic
Yes
Replace
X2405 or N3101
No
Is
L2401 = Max 2 Ohm
L2402 = Max 2 Ohm
No
Replace
L2401 or L2402
Yes
More than
40 mV AC Pk-Pk at
MP 123 (R3151)
Yes
0 Volt DC
at MP 120 (R3149)
No
SL 5 Replace
N2010
SL 4 Escalate
No
SL 5 Replace
N3103
SL 4 Escalate
Yes
More than
40 mV AC Pk-Pk at
MP 101 (L3125) and
MP 100 (L3126)
when blowing into
the PHF mic
Yes
SL 5 Replace
N2000
SL 4 Escalate
No
More than
40 mV AC Pk-Pk at
MP 108 (L2403) and
MP 109 (L2404)
when blowing into
the PHF mic
Yes
Replace
X2405
Yes
Is
L2403 = Max 2 Ohm
L2404 = Max 2 Ohm
L2406 = Max 1 Ohm
No
Replace
X2405 or N3101
Yes
Replace
L2403, L2404 or
L2406
No
Disconnect:
VBATT and DCIO/SEPI
Disconnect:
VBATT and DCIO/SEPI
Hands-Free (PHF) Problems
SEMC Troubleshooting Manual
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