User Guide

PAMS
Technical Documentation
NSE–8/9
Troubleshooting
Page 37
Issue 1 07/99
4.3 . Fault finding chart for GSM transmitter
Oscilloscope
SUMMA N700 pin 41 VREF Vdc = 1.5 Volt
SUMMA N700 pin 27, 47 VTX Vdc = 2.8 Volt
SUMMA N700 pin 32 TXP Vdc > 2.5 Volt
CRFU3 N600 pin 8, 47 VSYN_2 Vdc = 2.8 Volt
CRFU3 N600 pin 39 VTX Vdc = 2.8 Volt
YES
OK
Check
BaseBand
Oscilloscope
SUMMA N700 pin 1 TXQN Vac = 0.4 Vpp, Vdc = 0.8 V
SUMMA N700 pin 2 TXQP Vac = 0.4 Vpp, Vdc = 0.8 V
SUMMA N700 pin 3 TXIP Vac = 0.4 Vpp, Vdc = 0.8 V
SUMMA N700 pin 4 TXIN Vac = 0.4 Vpp, Vdc = 0.8 V
OK
Check
BaseBand
Spectrum analyser
SUMMA N700
pin 44, 45
116 MHz
Pout = –9 dBm
Check
SUMMA
VHF Synthesizer
Spectrum analyser
CRFU3 N600
pin 25, 26
116 MHz
NO
NO
NO
YES
YES
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