C905
1222-9526 rev. 1
TROUBLESHOOTING
GSM Problems
TROU
B
L
E
S
H
O
OTIN
G
- WCDMA I, II and V Problems
Max 0.5
Ohm between
MP 62 (X1200_Pin 1) and
MP 63 (X1200_Pin 2)
Replace
X1200
No
Is
MP 167 (X1210)
and MP 168 (X1211)
connected to GND
(Shield Can
Fence)
Yes
Replace
X1210 or X1211
No
Max
1 Ohm between
MP 166 (Z1200_Pin
IN) and MP 167
(X1210)
Yes
SL 5 Replace
Z1200, R1202 or
L1202
SL 4 Escalate
No
Use TRS Fixture
Connect:
VBATT and DCIO/SEPI
Yes
2.8 Volt DC at
MP 163 (C1218
LDOA_OUT)
SL 5 Replace
N2000
SL 4 Escalate
No
2.8V DC
at MP 65 (C1207)
(If C905c Skip This
and Replace
N1200)
Yes
Replace
N1211
No
Replace
N1200
Yes
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
Perform SERP Calibration and retest the Phone
If successful claim SERP Calibration
If not go to step 3.
Step 3:
Disassembly the Phone and continue with the
GSM Network Problems TRS guide
Is the
GSM Network
Problem
solved
Claim Component
N1200
Yes
SL 5 Replace
N2010 or N2000
SL 4 Escalate
No
Go to
SERP Calibration
GSM Network Problems
Replace
N1210
No
Replace
N1200
Is the
GSM Network
Ok
Go to
GSM Network
Problems TRS guide
No
Fault Trace SW
TX and RX WCDMA
Radio Settings:
Select Band: BAND I
Fast select channels:
Set Low Channel
Ch LOW
Modes: Max Pwr 23dBm
START
NOTE !
This TRS guide is NOT valid for C905c Phones
Step 1:
Load ITP SW into the Phone
Perform SERP Calibration and retest the Phone
If successful claim SERP Calibration
If not go to step 2.
Step 2:
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW
1.8 Volt DC at
MP 144 (R1210
WPA0_EN)
Yes
3V – 3.8V DC at
MP 145 (ST1201
VCC_WPA)
No
2.5V – 3V DC at
MP 143 (C1215
WPA_A_EN)
Yes
No
Is there
problems with
WCDMA TX
Yes
Replace
N1200
No
Yes
Claim Component
N1210
Yes
SL 5 Replace
N2010 or N2000
SL 4 Escalate
No
Disconnect:
VBATT and DCIO/SEPI
Yes
Is
L1200 = Max 0.5 Ohm
Replace
N1210
Yes
SL 5 Replace
L1200
SL 4 Escalate
No
Is the
WCDMA TX
Problem solved
SL 5 Replace
N2010
SL 4 Escalate
Go to
SERP Calibration
WCDMA BAND I,II,V Network Problems
SEMC Troubleshooting Manual
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