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NHM-2/5nx,ny/6/9
Troubleshooting
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Set to Local Mode
PCN RX continuos
Channel = 700
AGC abs. = 4
Apply -55dBm
1842.867MHz signal from
generator to antenna
connector
Spectrumanalyzer
C593/L510
-76dBm
Yes
Oscilloscope at RXI and RXQ
Signal 570mVpp
DC offset 1,2V
Frequency 67kHz
Both
NOT ok
Spectrumanalyzer
PCN LNA out
-58dBm
No
Spectrumanalyzer
1st Dual SAW
GSM1800 out
-83dBm
No
Spectrumanalyzer
PCN_RX_SW
-81dBm
No
Check RX/TX
Switch
Z502
3DJH
GSM1800 RX
Troubleshooting
Check
No
Signal Generator,
Antenna adapter
Both signals ok
Local Continuos mode
Check Hagar N500,
One signal ok
T500, C507, C515, L500
C512, C514, R504
Spectrumanalyzer
Yes
T500 unbal
Yes
-60dBm
No
Check
C519, Z500
Oscilloscope
LNA_P 2.4-2.8V
Yes
Yes
LNAB_G 2.4-2.8V
No
Oscilloscope
VRX 2.7V
Yes
Hagar serial
interface OK
No
Check BB
Check 1st Dual
Yes
RX SAW Z501,
C547
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PAMS Technical Documentation
GSM1800 chain
RX Normal Mode
functional
Troubleshooting chart
Oscilloscope
Check
Hagar N500,
VRX 2.7V
Yes
Hagar serial
T500, C507,
interface OK
C515, L500
No
Check BB
Oscilloscope
V500, RFout 2.6-2.7V
V500, RFin 0.8-0.9V
Check V500,
Check Hagar
R513, L502, C519
N500
C517,C509,C510,
R506, C521, C511
Go to
Go to
PLL Synthezizer
Troubleshooting chart
Check
Yes
V500, C517, C519
No
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