Trouble Shooting Guide Repair Instruction Electrical/Trouble Shooting Guide, Electrical/
1257-5712 Rev 1
Sony Ericsson Mobile Communications AB
– Company Internal 14(15)
Troubleshooting Flow
1.12 Network & Signal
Symptom:
Action:
Phone fails to lock on to network during radiated (wireless) Go/ No Go test
Use RF probe to perform conducted Go / No Go test
Symptom:
Check:
Replace:
Action:
Phone passes conducted (RF cable) Go / No Go test but fails radiated (wireless) Go / No
Go test
X280
1
for damage and replace, if more than 1
between A and C term
Rear Cover Assembly
Rerun the phone through radiated (wireless) Go / No Go testing
Symptom:
Action:
Phone fails conducted (RF probe) Go / No Go test
Run the calibration routine
Symptom:
Action:
Fails conducted (RF probe) Go/No Go test, but passes calibration
Rerun the phone through Go/No Go testing
Symptom:
Check:
Replace:
Fails any part of the calibration routine
X2801
for damage and replace, if more than 1
between RF probe and C term or
A and C term is short circuit then the probe is inserted.
N2803C
or
N2800
, if GSM Low band Rx fault.
N2803C
,
N2800
or
Z2800C
, if GSM High Band Rx fault
N2803C
or
N2800
, if WCDMA Rx fault
V8101
,
N2801C
,
N2803C
or
N2800
, if GSM Tx fault
N2900
,
N2803C
or
N2800
,if WCDMA Tx band 5 or 8
N2903
,
N2803C
or
N2800
,if WCDMA Tx band 1 fault
N2902
,
N2803C
or
N2800
,if WCDMA Tx band 2 fault