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
Ch37
Ensure Vbatt=3.9 V
Yes
Oscilloscope
R702
R525
C520
TXP testpoint
C552
C574
Yes
Oscilloscope
C535
C535
C536
C536
Yes
Oscilloscope
C713
VC1
VC2
VC3
R712
Yes
Spectrum analyzer
Z700 out, R706 in
Yes
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 10
Yes
Spectrum analyzer
Spectrum analyzer
Z809TX1 (PA N700
Z809TX1 (PA N700
RFOut_850/900)
Power = +25 dBm, 897.4
MHz
Yes
Spectrum analyzer
RF-connector
Pout
= +23 dBm, 897.4 MHz
Yes
GSM900 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_900 Vdc = 2.78 Volt
CONT1 Vdc = 0 Volt
CONT2
Vdc = 0 Volt
CONT3 Vdc = 2.7 Volt
VPCTRL_90 Vdc > 1 Volt
0
RFin_850/ P>= -3 dBm, 897.4MHz
900
Compare with good
sample
Check PA N700
Check PA N700
No Check Power Loop
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/
Page 37