User Guide

Nokia Customer Care Troubleshooting Instructions
Company confidential NPL-4/5
Issue 1 05/04 Copyright © 2004 Nokia Corporation. All rights reserved. Page 33
GMSK
Use Phoenix to select
TX_Data Type: "1" or "0"
TX Power Level: 10
Ch190
Ensure Vbatt=3.9 V
Yes
Oscilloscope
C702 Mode Vdc = 0 Volt
R525
VREF01
Vdc = 1.35 Volt Check
C500
VR2
Vdc = 2.78 Volt No Base Band
TXP testpoint J504
TXP
Vdc = 1.8 Volt
C553
VR5
Vdc = 2.78 Volt
C574
VR3
Vdc = 2.78 Volt
Yes
Oscilloscope
C529
TXIOUTP
67kHz
Vac = 0.4 Vpp, Vdc
= 1.1 V
No Check
C529
TXIOUTN
67kHz
Vac = 0.4 Vpp, Vdc
= 1.1 V
Base Band
C530
TXQOUTP
67kHz
Vac = 0.4 Vpp, Vdc
= 1.1 V
C530
TXQOUTN
67kHz
Vac = 0.4 Vpp, Vdc
= 1.1 V
Yes
Oscilloscope
C713 VTXB_850 Vdc = 2.88 Volt No Check:
VC1 CONT1 Vdc = 0 Volt Helgo Serial Interface
VC2 CONT2 Vdc = 0 Volt Helgo
VC3 CONT3 Vdc = 2.76 Volt
R703 VPCTRL_850 Vdc > 1.3 Volt
Yes
Spectrum analyzer No Check
C707 RFin_850/900 P>= -3 dBm,
836.6MHz
EGSM TX SAW Filter
Compare with
good sample
Helgo
Yes Synthesizer
Use Phoenix to select
TX_Data Type: Random
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 10
Yes
Spectrum analyzer Check PA N700
Z809 TX1 (PA
N700RFOut_850/900)
No Check Power Loop
Power = +25 dBm,
836.6MHz
Check TXC
Yes
Spectrum analyzer Check
RF-connector No
Pout
= +23 dBm, 836.6MHz
Antenna Switch
(Z809)
Yes
GSM850 TX
OK