User Guide

Nokia Customer Care Troubleshooting Instructions
Company confidential NPL-4/5
Issue 1 05/04 Copyright © 2004 Nokia Corporation. All rights reserved. Page 29
Table 1: Switching States
To switch the TX -GSM 1800/1900 path both signals VANT2 and VANT3 have to be acti-
vated. This increases the isolation from the TX-GSM 1800/1900 path to the RX-GSM
1800 path and reduces the feed back of RF-power to the RF ASIC.
GSM850 transmitter
GSM850 chapture is valid only for the NPL-4 (US variant). Start the preparations as
described in chapter General instruction for the transmitter troubleshooting.
General instructions for GSM850 TX troubleshooting
GMSK
Select operating mode to “local mode”:
Select->Testing->RF Controls
In the popped up window:
Select->Band->GSM 850
-Active unit->TX
-Operation mode->Burst
-RX/TX Channel->190
-TX Power Level->10
-TX Data Type->Random
The Phoenix window should now look like this:
VANT2
VC1
[Volt]
VANT3
VC2
[Volt]
VANT1
VC3
[Volt]
Rx1
GSM
850/
900
Rx
Rx2
GSM
1800
Rx
Rx3
GSM
1900
Rx
TX_IN_E
GSM
Tx1
GSM
850/
900
Tx
TX_IN_D
CS
Tx2
GSM
1800/1900
Tx
0 0 0 X
0 0 0 X
0 0 2.7 X
0 2.7 0 X
2.7 2.7 0 X