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Apply –90dBm
942.46771 MHz signal from
generator to antenna connector
Yes
Oscilloscope at RX_I
Signal 700mVpp
DC offset 1.35V
Frequency 67.7 kHz
Yes
EGSM RX
chain
functional
Check
baseband
Synthesizer
troubleshooting
Note:
All spectrum analyzer
reading values are
measured with 1 kOhm
passive probe
(use tweezers to connect
the probe ground to the
nearest PWB ground)
Reading value is represented
without +26dB compensation.
*When 1kOhm passive probe is used,
correct measurement result by +26dB
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Spectrum
Change
No
Yes
analyzer
generator
level
900 LNA out
to –50 dBm
-61 dBm
Yes
Spectrum
Check
No
analyzer
Z501, C505,
900 bal out
C506,L501
-66 dBm
Oscilloscope
No
VR4 2.7V
Check HAGAR
serial interface.
(burst mode)
Spectrum
No
analyzer
4G VCO out
3769.6 MHz
-30 dBm(*
Yes
Check
HAGAR N600
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Check
antenna switch
Z500
Spectrum
Spectrum
No
No
analyzer
analyzer
1st SAW out
900 RX
-80dBm
-79 dBm
Yes
Check
Yes
dual RX SAW
Z520
Check
baseband
Oscilloscope
VR4 2.7V
Oscilloscope
Check HAGAR
LNA_G 2.7V
serial interface.
LNAB_G 2.7V
check R501
Yes
Yes
Check
HAGAR N600
Spectrum
Yes
analyzer
V500, RFout
-57 dBm
No
Oscilloscope
No
V500, RFout 2.7V
V500, RFin 0.8V
Yes
Check
V500, C501
L502, L503
1+0
No
No
Check
C502
Check
V500,L500
R502
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