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CCS Technical Documentation
NHL-2NA
Issue 1 07/02
¤
Nokia Corporation
Page 7
Troubleshooting diagram for GSM900 receiver
:
Yes
Apply –90dBm
942.46771MHz
signal from generator
to antenna connector
Oscilloscope at RX_I
Signal 700mVpp
DC offset 1.35V
Frequency 67.7kHz
No
Change
generator
level to
–50dBm
Spectrumanalyzer
900 SAW i/p
-61 dBm
Yes
No
Spectrumanalyzer
900 ASM RX
-80 dBm
EGSM RX chain
functional
Yes
Spectrumanalyzer
900 SAW o/p
-66 dBm
Oscilloscope
VR4 2.7V
Check Hagar
serial interface
(burst mode)
Yes
No
Check Z600,
C599, C601, L600
Check Baseband
No
Yes
Spectrumanalyzer
VCO o/p
3769.6MHz
∼
-37 dBm (*
Synthesizer
troubleshooting
No
Check Hagar
N505
Yes
Yes
Oscilloscope
LNA_G 2.6V
LNAB_G 2.7V
Yes
Yes
Spectrumanalyzer
900 LNA o/p
–57 dBm
Yes
Check C610
No
Oscilloscope
900 LNA o/p 2.6V
900 LNA i/p 0.8 V
Check V610,
C597, L566, L567
Yes
No
Check V610,
L610, R616
Oscilloscope
VR4 2.7V
Check Hagar
serial interface
Check R612
No
Check Hagar
N505
Check
Baseband
No
Yes
No
Check
Antenna
switch
Z672
* Spectrumanalyzer
reading with 1 kohm
passive probe (right
value add +26 dB)
All spectrumanalyzer
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 w26
dB compensation.
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