Sony Ericsson C702, Troubleshooting Manual

Page: 19 / 116

C702
1221-7857 rev. 1
TROUBLESHOOTING GSM Network Problems
TROU
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E
S
H
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OTIN
G
START
Max
0.5 Ohm between
MP 51 (X1200_Pin 1) and
MP 50 (X1200_Pin 2)
Replace
X1200
No
Max
0.5 Ohm between
MP 50 (X1200_Pin 2)
and MP 67 (X1201)
Yes
Is L2409
Max 0.5 Ohm
No
SL 5 Replace
L2409
SL 4 Escalate
Yes
Replace
X1201
No
Max
0.5 Ohm between
Shield Can Fence and
MP 66 (X1202)
MP 68 (X1203)
Yes
Replace
X1202 or X1203
No
1: Load ITP SW into the
Phone
2: Use TRS Fixture
Connect:
VBATT: 3.8 Volt, Limiter 3A,
DCIO/SEPI and
SMK RF Probe
3: Use Fault Trace SW
Yes
2.8 Volt DC
at MP 43 (C2230
VccA)
SL 5 Replace
N2000
SL 4 Escalate
No
Perform
TX Measurements at the
following GSM Bands:
GSM 850, GSM 900
DCS 1800 and PCS 1900
Yes
Connect Mobile Phone Tester
Instrument Settings:
System Mode:
TX/RX Tester Mode (GSM)
GSM BAND:
GSM 850, Channel 128
GSM 900, Channel 38
DCS 1800, Channel 512
PCS 1900, Channel 512
Measurement Mode:
Repeat, Burst
Correction: 1.6 dB
Fault Trace SW
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band: Select Channel: Power Level:
GSM 850 128 5
GSM 900 38 5
DCS 1800 512 0
PCS 1900 512 0
Phone
Reported power
at 850 and 900=33dBm
1800 and 1900=30dBm
( ±3dBm )
Go to
GSM Network
Problems RX part
Yes
Is
Phone
Reported Power
±5 dBm
No
Go to
SERP Calibration
Yes
Fault Trace SW
TX and RX GSM
GSM Mode Settings:
TX Switched
GSM Radio Settings:
Select Band : GSM 850
Channel : 128
Power Level: 5
No
1.4V-1.6V Pk-Pk
Pulses at
MP 123 (R1000
VAPC)
Replace
N1200
No
Fault Trace SW
Switch GSM Mode
Settings to:
TX Static
Yes
Use Spectrum Analyzer
Instrument settings:
TX Freq: 824.2 MHz
Span: 300 kHZ
Amplitude: -5 dBm
BW: 1 kHz
Use RF Probe with
10:1 Divider
Signal at
MP 122 (Z1001)
-20 dBm
(
±5 dBm)
SL 5 Replace
N1002
SL 4 Escalate
No
Fault Trace SW
TX and RX GSM
GSM Mode Settings:
TX Static
GSM Radio Settings:
Select Band : DCS 1800
Channel : 512
Yes
Use Spectrum Analyzer
Instrument settings:
TX Freq: 1710.2 MHz
Span: 300 kHZ
Amplitude: -5 dBm
BW: 1 kHz
Use RF Probe with
10:1 Divider
Signal at
MP 124 (C1014)
-10 dBm
(
±5 dBm)
Replace
N1200
SL 5 Replace
N1002
SL 4 Escalate
No
Yes
Go to
SERP Calibration
GSM Network Problems TX part
START
Note!
Before following this guide the
GSM Network Problems TX part
must be finished!
Connect Mobile Phone Tester
Instrument Settings:
System Mode:
TX/RX Tester Mode (GSM)
GSM BAND: Select Channel:
GSM 850 128
GSM 900 38
DCS 1800 512
PCS 1900 512
RF Power ON: -60 dBm
Correction: -1.6 dBm
Measurement Mode:
Repeat, CW
Fault Trace SW
TX and RX GSM
GSM Mode Settings:
RX Switched
GSM Radio Settings:
Select Band: Select Channel:
GSM 850 128
GSM 900 38
DCS 1800 512
PCS 1900 512
GSM RSSI Measurements:
Start RSSI Test
RSSI Test
Passed
No
Perform
GSM RSSI Test at
following GSM Bands:
GSM 850
GSM 900
DCS 1800
PCS 1900
Replace
N1200
Yes
Go to
WCDMA Network
Problems TRS guide
GSM Network Problems RX part
SEMC Troubleshooting Manual
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