User Guide

NPL-4/5 Company confidential
Troubleshooting Instructions Nokia Customer Care
Page 38 Copyright © 2004 Nokia Corporation. All rights reserved. Issue 1 05/04
EDGE
Ensure that the GMSK is OK!
GSM1800 transmitter
General instructions for GSM1800 TX troubleshooting
Start the preparations as described in chapter Check Synthesizer Operation.
GMSK
Set the operating mode to “local mode”.
Select->Testing->RF Controls
Wait until the RF Controls window is popped up
Select->Band->GSM 1800
-Active unit->TX
-Operation mode->Burst
-RX/TX Channel->700
-TX Power Level->5
Use Phoenix to select
TX_Data Type: "1" or "0"
TX Power Level: 10
Ch37
Ensure Vbatt=3.9 V
Yes
Oscilloscope
R705
IREF01
Vdc > 0.5 Volt Check
R702
Mode
Vdc = 2.78 Volt No Base Band
BOM1 VPCTRL_900
R703
Vdc= 0 V
BOM2 VPCTRL_900
R703
Vdc= 2.7 V
Yes
Spectrum analyzer Check PA N700
RF-connector No Check Power Loop
Pout
= +24 dBm, 897.4MHz
Yes
GSM900 TX
OK