Gmsk - Nokia NPL-4 Series Troubleshooting Instructions

Nokia Customer Care

GMSK

TX_Data Type: "1" or "0"
TX Power Level: 5
Ch700
Ensure Vbatt=3.9V
Yes
Oscilloscope
R702
R525
C500
TXP testpoint
C552
C574
Yes
Oscilloscope
C535
C535
C536
C536
Yes
Oscilloscope
C709
VC1
VC2
VC3
R713
Yes
Spectrum analyzer
T700 out, R710n
Yes
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 5
Yes
Spectrum analyzer
Spectrum analyzer
Z809TX2 Z809TX2 (PA N700 (PA N700
RFOut_1800/1900)
RFOut_1800/1900)
Power = +22 dBm, 1747.8
MHz
Yes
Spectrum analyzer
RF-connector
Pout
= +20 dBm, 1747.8 MHz
Yes
GSM 1800 TX
OK
Copyright © 2005 Nokia Corporation. All rights reserved.
Issue 2 05/05
Company confidential
Mode Vdc = 0 Volt
VREF01 Vdc = 1.35 Volt
VR2 Vdc = 2.78 Volt
TXP Vdc = 1.88 Volt
VR5 Vdc = 2.78 Volt
VR3 Vdc = 2.78 Volt
TXIOUTP 67kHz
Vac = 0.4 Vpp, Vdc =
1.1 V
TXIOUTN 67kHz
Vac = 0.4 Vpp, Vdc =
1.1 V
TXQOUTP 67kHz
Vac = 0.4 Vpp, Vdc =
1.1 V
TXQOUTN
67kHz
Vac = 0.4 Vpp, Vdc =
1.1 V
VTXB_1800 Vdc = 2.78 Volt
_1900
CONT1 Vdc = 2.7 Volt
CONT2 Vdc = 2.7 Volt
CONT3 Vdc = 0 Volt
VPCTRL_18 Vdc > 1 Volt
00_1900
RFin_180 P>= -3 dBm, 1747.8MHz
0/1900
Compare with good
sample
Check PA N700
Check PA N700
No No Check Power Loop Check Power Loop
Check TXC
Check
No
Antenna Switch (Z809)
Troubleshooting Instructions
Check
No Base Band
No Check
Base Band
No Check:
Helgo Serial Interface
Helgo
No Check
T700 Balun
Helgo
Synthesizer
NPL-4/5/
Page 41