Edge; Gsm900 Transmitter; General Instructions For Gsm Tx Troubleshooting; Gmsk - Nokia NPL-4 Series Troubleshooting Instructions

NPL-4/5/RM-104
Troubleshooting Instructions

EDGE

Ensure that the GMSK is OK!
Use Phoenix to select
TX_Data Type: "1" or "0"
TX Power Level: 10
Ch190
Ensure Vbatt=3.9 V
Yes
Oscilloscope
C741
C702
BOM1 VPCTRL_900
BOM2 VPCTRL_900
Yes
Spectrum analyzer
RF-connector
Pout
= +24 dBm, 836.6MHz
Yes
GSM850 TX
OK

GSM900 transmitter

GSM900 chapter is valid only for the NPL-5 (EU variant).

General instructions for GSM TX troubleshooting

GMSK

Set the operating mode to the "local mode".
Select-<Testing->RF Controls
Wait until the RF Controls window is popped up
Select->Band->GSM 900
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IREF01 Vdc >
Mode
Vdc =
R703
R703
Vdc= 2.7 V
Check PA N700
No Check Power Loop
-Active unit->TX
-Operation mode->Burst
-RX/TX Channel->37
-TX Power Level->10
0.5 Volt
2.78 Volt No
Vdc= 0 V
Nokia Customer Care
Check
Base Band
Issue 2 05/05