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NHM-2/5nx,ny/6/9
Troubleshooting
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Set to Local Mode
EGSM RX continuos
Channel = 38
AGC abs. = 4
Apply -55dBm
942.667MHz signal from
generator to antenna
connector
Spectrumanalyzer
C593/L510
-74dBm
Yes
Oscilloscope at RXI and RXQ
Signal 550mVpp
DC offset 1,2V
Frequency 67kHz
Both
NOT ok
Spectrumanalyzer
GSM LNA out
Yes
-58dBm
No
Spectrumanalyzer
1st Dual SAW
Yes
GSM900 out
-77dBm
No
Spectrumanalyzer
Yes
GSM_RX_SW
-76dBm
No
Check RX/TX
Switch
Z502
3DJH
EGSM RX
Troubleshooting
Check
No
Signal Generator,
Antenna adapter
Both signals ok
EGSM chain functional
Local Continuos mode
Check Hagar N500,
One signal ok
T501, C520, C528, L504
C512, C514, R504
Oscilloscope
Spectrumanalyzer
VRX 2.7V
T501 unbal
Yes
Hagar serial
-59dBm
interface OK
No
Check
Check BB
C534, Z500
Oscilloscope
LNA_G 2.4-2.8V
Yes
LNAB_D 2.4-2.8V
No
Oscilloscope
Check Hagar
VRX 2.7V
Yes
Hagar serial
N500
interface OK
No
Check BB
Check 1st Dual
RX SAW Z501,
C556
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PAMS Technical Documentation
Go to
GSM1800 RX
Troubleshooting chart
Check
Hagar N500,
Yes
T501, C520,
C528, L504
No
Oscilloscope
V501, RFout 2.1-2.2V
V501, RFin 0.8-0.9V
No
Check V501,
R508, C530, R530
C533, C541, C537
L506, R514, C539
Go to
PLL Synthezizer
Troubleshooting chart
Check V501,
C537, L520, C534
Yes
C541, L507, C545
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