User Guide

Nokia Customer Care Troubleshooting Instructions
Company confidential NPL-4/5
Issue 1 05/04 Copyright © 2004 Nokia Corporation. All rights reserved. Page 37
GMSK
Use Phoenix to select
TX_Data Type: "1" or "0"
TX Power Level: 10
Ch37
Ensure Vbatt=3.9 V
Yes
Oscilloscope
R702 Mode Vdc = 0 Volt
R525
VREF01
Vdc = 1.35 Volt Check
C520
VR2
Vdc = 2.78 Volt No Base Band
TXP testpoint
TXP
Vdc = 1.8 Volt
C552
VR5
Vdc = 2.78 Volt
C574
VR3
Vdc = 2.78 Volt
Yes
Oscilloscope
C535
TXIOUTP
67kHz
Vac = 0.4 Vpp, Vdc =
1.1 V
No Check
C535
TXIOUTN
67kHz
Vac = 0.4 Vpp, Vdc =
1.1 V
Base Band
C536
TXQOUTP
67kHz
Vac = 0.4 Vpp, Vdc =
1.1 V
C536
TXQOUTN
67kHz
Vac = 0.4 Vpp, Vdc =
1.1 V
Yes
Oscilloscope
C713
VTXB_900
Vdc = 2.78 Volt No Check:
VC1
CONT1
Vdc = 0 Volt Helgo Serial Interface
VC2
CONT2
Vdc = 0 Volt Helgo
VC3
CONT3
Vdc = 2.7 Volt
R712
VPCTRL_90
0
Vdc > 1 Volt
Yes
Spectrum analyzer No Check
Z700 out, R706 in RFin_850/
900
P>= -3 dBm, 897.4MHz EGSM TX SAW Filter
Compare with good
sample
Helgo
Yes Synthesizer
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 10
Yes
Spectrum analyzer Check PA N700
Z809TX1 (PA N700 No Check Power Loop
Spectrum analyzer Check PA N700
Z809TX1 (PA N700
RFOut_850/900)
No Check Power Loop
Power = +25 dBm, 897.4
MHz
Check TXC
Yes
Spectrum analyzer Check
RF-connector No
Pout
= +23 dBm, 897.4 MHz
Antenna Switch (Z809)
Yes
GSM900 TX
OK