W995
1230-1858 rev. 1
TROUBLESHOOTING
A-GPS Problems
T
R
O
UBL
ESHOOT
ING
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
Is the
A-GPS (N1400)
Asic Revision Test
Ok
Go to
A-GPS Problems
part 2
Yes
1.8 Volt DC at
MP 74 (R1417)
and MP 72
(N2410_Pin 2)
No
Replace
N2410
No
2 Volt DC at
MP 47 (C1431
VAGPS20)
Yes
Replace
N1411
No
2.8 Volt DC at
MP 46 (C1433
VAGPS28)
Yes
Replace
N1412
No
26 MHz at
MP 49 (R1408
AGPS_CLK)
Yes
SL 4 Replace
N2410
SL 5 Replace
N2101 or N2010
No
Yes
27 MHz at
MP 48 (R1404)
Replace
B1400
No
SL 4 Replace
N1400
SL 5 Replace
N2010
Yes
A-GPS Problems part 1
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
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
MP 45 (L1403)
(
±0.5 MHz),
(
±10 dBm)
(See MP picture
MP L1403:a)
Replace
N1400
No
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
Yes
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
1575.44 MHz
-55 dBm signal at
MP 45 (L1403)
(
±0.5 MHz),
(
±10 dBm)
(See MP picture
MP L1403:b)
SL 4 Replace
N1400
SL 5 Replace
N2010
Yes
1.6V – 1.8V DC
at MP 42 (C1407)
No
Replace
N1400
No
1575.42 MHz
-55 dBm signal at
MP 40 (C1402)
(
±0.5 MHz),
(
±10 dBm)
Yes
SL 4 Replace
N1410
SL 5 Replace
Z1401
Yes
Replace
Z1400
No
A-GPS Problems part 2
SEMC Troubleshooting Manual
30
(125)