Gmsk - Nokia NPL-4 Series Troubleshooting Instructions

Nokia Customer Care

GMSK

Use Phoenix to select
TX_Data Type: "1" or "0"
TX Power Level: 10
Ch190
Ensure Vbatt=3.9 V
Yes
Oscilloscope
C702
R525
C500
TXP testpoint J504
C553
C574
Yes
Oscilloscope
C529
C529
C530
C530
Yes
Oscilloscope
C713
VC1
VC2
VC3
R703
Yes
Spectrum analyzer
C707
Yes
Use Phoenix to select
Use Phoenix to select
TX_Data Type: Random
TX_Data Type: Random
TX Power Level: 10
Yes
Spectrum analyzer
Z809 TX1 (PA
N700RFOut_850/900)
Power = +25 dBm,
836.6MHz
Yes
Spectrum analyzer
RF-connector
Pout
= +23 dBm, 836.6MHz
Yes
GSM850 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 = 1.8 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_850 Vdc = 2.88 Volt
CONT1 Vdc = 0 Volt
CONT2 Vdc = 0 Volt
CONT3 Vdc = 2.76 Volt
VPCTRL_850 Vdc > 1.3 Volt
RFin_850/900 P>= -3 dBm,
836.6MHz
Compare with
good sample
Check PA N700
No 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
EGSM TX SAW Filter
Helgo
Synthesizer
NPL-4/5/
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