Technicians Only. Sony Ericsson Is Not To Be Held Responsible For Any Damages Or Losses Caused Gsm Network Problems - Sony Ericsson W890 Troubleshooting Manual

GSM Network Problems TX part
Replace
START
X1100 or X1203
No
Max
3 Ohm between
MP 95 (X1203_Pin 1)
MP 96 (X1203_Pin 2)
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
No PCS 1900 512 0
Is
Perform
Phone Reported
No
Antenna Switch Test
Power ±5 dBm
Yes
Go to Antenna Swich
SERP Calibration Test Passed
SL 5 Replace
D2000 No
SL 4 Escalate
Signal at
Replace MP 2 (R1234)
No
N1200 -17 dBm
(±5dBm)
Yes
Signal at
Replace MP 4 (L1236)
No
N1230 -12 dBm
(±5dBm)
Is
Replace
No X1000
Z1230
Damaged
Yes
Replace
X1000
TROUBLESHOOTING
SL 5 Replace
N2000
SL 4 Escalate
No
Load ITP SW into the Phone
Use TRS Fixture
2.8 Volt DC
Connect:
Yes at MP 80 (C2230
VBATT: 3.8 Volt, Limiter 3A,
VccA)
DCIO/SEPI and SMK RF Probe
Use Fault Trace SW
Yes
Connect Mobile Phone Tester
Instrument Settings:
System Mode:
TX/RX Tester Mode (GSM)
Perform
GSM BAND:
TX Measurements at
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
Measurment Mode:
Repeat, Burst
Correction: 1.6 dB
Replace
N1200
No
Fault Trace SW
TX and RX GSM
GSM Mode Settings: 1.4V-1.6V
TX Switched Pk-Pk Pulses at
Yes
GSM Radio Settings: MP 3 (R1233
Select Band : GSM 850 VAPC)
Channel : 128
Power Level: 5
Yes
Use Spectrum Analyzer
Instrument settings:
TX Freq: 824.2 MHz Fault Trace SW
Span: 300 kHZ Switch GSM Mode
Amplitude: -5 dBm Settings to:
BW: Auto TX Static
Use RF Probe with
10:1 Divider
Use Spectrum Analyzer
Fault Trace SW
Instrument settings:
TX and RX GSM
TX Freq: 1710.2 MHz
GSM Mode Settings:
Span: 300 kHZ
Yes TX Static
Amplitude: -5 dBm
GSM Radio Settings:
BW: Auto
Select Band : DCS 1800
Use RF Probe with
Channel : 512
10:1 Divider
Signal at Signal at
MP 5 (L1234) MP 1 (L1235)
Yes Yes
-12 dBm -15 dBm
(±5dBm) (±5dBm)
No No
Replace Replace
N1230 N1200
GSM Network Problems
GSM Network Problems RX part
START
NOTE !
Before this the
GSM Network Problems TX part
TRS guide 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
Is
Phone Reported
Replace
No
Z1230 Power -60 dBm
(±5dBm)
Replace
Yes
N1200
SEMC Troubleshooting Manual
WCDMA Network
Problems TX part
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
512
GSM 900
38
512
DCS 1800 512
PCS 1900 512
GSM RSSI Measurements:
Start RSSI Test
Instrument Settings:
Fault Trace SW
System Mode:
TX and RX WCDMA
TX/RX Tester Mode
Radio Settings:
WCDMA
Select Band : Band I
Downlink Channel:
Fast select channels:
BAND I: 10562
Ch LOW
Measurement Mode:
Modes: Read RSSI
RX On:
RF Power ON: -60 dBm
Read Measurement
Correction: -1.6 dBm
1217-3942 rev. 1
W890
Go to
Yes
Passed
No
Repeat
18 (119)