A-Gps Problems - Sony Ericsson W995 Troubleshooting Manual

A-GPS Problems part 1
START
Step 1:
Replace BT GPS Antenna and retest the Phone
If successful claim BT GPS Antenna
if not go to Step 2.
Step 2:
Load ETS SW into the Phone
Use TRS Fixture
Connect: VBATT and DCIO/SEPI
Use Fault Trace SW and go to:
General
Asic Revisions
Read All
TROUBLESHOOTING
Is the
Go to
A-GPS (N1400)
Yes

A-GPS Problems

Asic Revision Test
part 2
Ok
No
1.8 Volt DC at
MP 74 (R1417) Replace
No
and MP 72 N2410
(N2410_Pin 2)
Yes
2 Volt DC at
Replace
MP 47 (C1431 No
N1411
VAGPS20)
Yes
2.8 Volt DC at
Replace
MP 46 (C1433 No
N1412
VAGPS28)
Yes
SL 4 Replace
26 MHz at
N2410
MP 49 (R1408 No
SL 5 Replace
AGPS_CLK)
N2101 or N2010
Yes
27 MHz at Replace
No
MP 48 (R1404) B1400
SL 4 Replace
N1400
Yes
SL 5 Replace
N2010
A-GPS Problems
A-GPS Problems part 2
START
Note!
Before starting this guide the A-GPS Problems part 1
TRS guide must be finished
Use Fault Trace SW and go to:
Tx and Rx
GPS
GPS Settings
Turn On GPS
1: Use Signal Generator Instrument
2: Connect RF Cable Flexible from the Signal Generator
Instrument to the
GPS Antenna RF Connector on the TRS Fixture
Signal Generator
Instrument Settings:
Frequency: 1575.42 MHz
Amplitude/Level: -50 dBm
RF: On
Mod Gen: Off
Modulation: Off
Use Spectrum Analyzer Instrument
Spectrum Analyzer Instrument Settings:
Frequency: 1575.42 MHz
Span: 10 MHz
Amplitude: -20 dBm
Use Peak Search (MKR)
NOTE !
Do not use 10:1 Divider
SEMC Troubleshooting Manual
Use Spectrum Analyzer Instrument
Spectrum Analyzer Instrument Settings:
Frequency: 1575.42 MHz
Span: 10 MHz
Amplitude: -20 dBm
Use Peak Search (MKR)
NOTE !
Do not use 10:1 Divider
1577.39 MHz
-68 dBm signal at
Replace
MP 45 (L1403)
Yes No
(±0.5 MHz), (±10 dBm) N1400
(See MP picture
MP L1403:a)
1575.44 MHz
SL 4 Replace
-55 dBm signal at
N1400
MP 45 (L1403)
Yes
(±0.5 MHz), (±10 dBm) SL 5 Replace
(See MP picture
N2010
MP L1403:b)
No
1.6V – 1.8V DC Replace
No
at MP 42 (C1407) N1400
Yes
1575.42 MHz
SL 4 Replace
-55 dBm signal at
N1410
Yes
MP 40 (C1402)
SL 5 Replace
(±0.5 MHz),
Z1401
(±10 dBm)
Replace
No
Z1400
1230-1858 rev. 1
W995
30 (125)