Nokia 5140 Manuales De Servicio
Nokia Customer Care
Troubleshooting Instructions
Company confidential
NPL-4/5
Issue 1 05/04
Copyright © 2004 Nokia Corporation. All rights reserved.
Page 41
GMSK
TX_Data Type: "1" or "0"
TX Power Level: 5
Ch700
Ensure Vbatt=3.9V
Yes
Oscilloscope
R702
Mode
Vdc = 0 Volt
R525
VREF01
Vdc = 1.35 Volt
Check
C500
VR2
Vdc = 2.78 Volt
No
Base Band
TXP testpoint
TXP
Vdc = 1.88 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
C709
VTXB_1800
_1900
Vdc = 2.78 Volt
No
Check:
VC1
CONT1
Vdc = 2.7 Volt
Helgo Serial Interface
VC2
CONT2
Vdc = 2.7 Volt
Helgo
VC3
CONT3
Vdc = 0 Volt
R713
VPCTRL_18
00_1900
Vdc > 1 Volt
Yes
Spectrum analyzer
No
Check
T700 out, R710n
RFin_180
0/1900
P>= -3 dBm, 1747.8MHz
T700 Balun
Compare
with
good
sample
Helgo
Yes
Synthesizer
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 5
Yes
Spectrum analyzer
Check PA N700
Z809TX2 (PA N700
RFOut_1800/1900)
No
Check Power Loop
Spectrum analyzer
Check PA N700
Z809TX2 (PA N700
RFOut_1800/1900)
No Check
Power
Loop
Power = +22 dBm, 1747.8
MHz
Check
TXC
Yes
Spectrum analyzer
Check
RF-connector No
Pout
= +20 dBm, 1747.8 MHz
Antenna
Switch
(Z809)
Yes
GSM 1800 TX
OK