User Guide

PAMS Technical Documentation 6 - Troubleshooting
NPE-4
Original ãNokia Corporation. Page 6-43
Fault finding chart for PCN transmitter
Synthesiser
There is only one PLL synthesiser generating frequencies for both Rx and Tx in both bands
Oscilloscope
R726 VREFRF01 Vdc = 1.5 Volt Check
C656 VR2 Vdc = 2.7 Volt No BaseBand
C760 TXP Vdc > 2.5 Volt
C601 VR4 Vdc = 2.7 Volt
C602 VR3 Vdc = 2.7 Volt
Yes
Oscilloscope
R764 TXIOUTP 67kHz
Vac = 0.4 Vpp, Vdc = 0.8 V
No Check
R764 TXIOUTN 67kHz
Vac = 0.4 Vpp, Vdc = 0.8 V
BaseBand
R766 TXQOUTP 67kHz
Vac = 0.4 Vpp, Vdc = 0.8 V
R766 TXQOUTN 67kHz
Vac = 0.4 Vpp, Vdc = 0.8 V
Yes
Oscilloscope
C856 VTXB_900 Vdc < 0.3 Volt No Check:
C866 VTXB_1800 Vdc > 2.0 Volt Hagar Serial Interface
C808 VANT1 Vdc > 2.0 Volt Hagar
C809 VANT2 Vdc < 0.3 Volt
C830 VBD Vdc > 2.0 Volt
Yes
Spectrum analyser No Check
T660 out, L868 TX_1800 Power > -3 dBm, 1747,8 MHz PCN TX Balun
Hagar
Yes Synthesiser
Use Wintesla to select
TX_Data Type: Random
TX Power Level: 5
Yes
Spectrum analyser Check PA N840
L836 PCN in
(PA N840 PCN out)
No Check Power Loop
L836,V830
Power = +22 dBm, 1747,8 MHz Check TXC
Yes
Spectrum analyser Check
RF-connector No Directional Coupler (L836)
Pout = +20 dBm, 1747,8 MHz RX/TX Switch (Z802)
Yes
PCN TX
OK