Gsm Network Problems - Sony Ericsson C702 Troubleshooting Manual

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

GSM Network Problems

GSM Network Problems RX part
START
Note!
Before following this guide the
GSM Network Problems TX part
must be finished!
Connect Mobile Phone Tester
Instrument Settings:
System Mode:
Perform
TX/RX Tester Mode (GSM)
GSM RSSI Test at
GSM BAND: Select Channel:
following GSM Bands:
GSM 850
GSM 900
GSM 850
DCS 1800
GSM 900
PCS 1900
DCS 1800
RF Power ON: -60 dBm
PCS 1900
Correction: -1.6 dBm
Measurement Mode:
Repeat, CW
SEMC Troubleshooting Manual
Go to
WCDMA Network
Problems TRS guide
Yes
Fault Trace SW
TX and RX GSM
GSM Mode Settings:
RX Switched
GSM Radio Settings:
128
Select Band: Select Channel: RSSI Test
38
GSM 850 128 Passed
512
GSM 900 38
512
DCS 1800 512
PCS 1900 512
GSM RSSI Measurements:
Start RSSI Test
No
Replace
N1200
1221-7857 rev. 1
C702
19 (115)