Antenna Switch Test - Sony Ericsson W890 Troubleshooting Manual

Antenna Switch Test

The purpose of this test is to check antenna switch functionality controlled by CPU
(Central Processing Unit)
To perform this test use:
- Phone with the ITP SW
- TRS Fixture
- Fault Trace SW
SW Settings: According to Fault Trace SW Settings Instructions
- Power Supply Channel 1 VBATT
Instrument settings: 3.8 Volt, Limiter 3 A
- Power Supply Channel 2 DCIO/SEPI
Instrument settings: 5.0 Volt, Limiter 2 A
- DMM (Digital Multi Meter).
Test Instructions:
Use Fault Trace SW to switch between GSM 850, DCS 1800 and WCDMA BAND I.
Use DMM and measure voltage at MP 6 (C1240), MP 7 (C1241) and MP 8 (C1242).
Compare the result with Antenna Switch Reference Table.
Note: 1.8 Volt = H (High) and 0.0 Volt = L (Low)
Fault Trace SW Settings Instructions:
Note: All bands below must be tested!
GSM 850:
Fault Trace SW
Tx and Rx
GSM
Gsm Mode Settings: TX Static
Gsm Radio Settings
Select Band: GSM 850
Select Channel: 128
DCS 1800:
Fault Trace SW
Tx and Rx
GSM
Radio Settings: TX Static
Gsm Radio Settings
Select Band: DCS 1800
Select Channel: 512
WCDMA BAND I:
Fault Trace SW
Tx and Rx
WCDMA
Select Band: BAND I
Select TX Channel: 9612
Modes: Max Pwr 23dBm
Antenna Switch Reference Table:
BAND MP C1240 MP C1241 MP C1242
GSM 850 H L
DCS 1800 H H
WCDMA BAND I H L
If all Bands passed Antenna Switch Test then continue with GSM Network Problems
TX part TRS guide, if not SL 5 Replace D2000 SL 4 Escalate.
TROUBLESHOOTING
H
L
L
Antenna Switch Test
SEMC Troubleshooting Manual
W890
1217-3942 rev. 1 24 (119)