User Guide

Issue 1 04/2005 COMPANY CONFIDENTIAL 29
Copyright © 2005 Nokia. All Rights Reserved.
RM-94
6(b) - RF Troubleshooting Nokia Customer Care
GMSK
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 5
Ch661
Ensure Vbatt=3.6 V
Yes
Oscilloscope
C7711 Mode Vdc = 0 Volt
R7511
VREF01
Vdc = 1.35 Volt Check
C7512
VR2
Vdc = 2.78 Volt No Baseband
TXP testpoint
TXP
V = 1.8 Volt
C7517
VR5
Vdc = 2.78 Volt
R7516
VR3
Vdc = 2.78 Volt
Yes
Oscilloscope
C7529
TXIOUTP
Vac = 0.4 Vpp, Vdc =
1.2 V
No Check
C7529
TXIOUTN
Vac = 0.4 Vpp, Vdc =
1.2 V
Baseband
C7530
TXQOUTP
Vac = 0.4 Vpp, Vdc =
1.2 V
C7530
TXQOUTN
Vac = 0.4 Vpp, Vdc =
1.2 V
Yes
Oscilloscope
C7709
VTXB_1800
_1900
V = 2.78 Volt No Check
VC1
CONT1
V = 2.7 Volt Helgo Serial Interface
VC2
CONT2
V = 2.7 Volt Helgo
VC3
CONT3
V = 0 Volt
R7715
VPCTRL_18
00_1900
V = 1.12 Volt
Yes
Spectrum analyzer No Check
T7700 out, R7709 in RFin_180
0/1900
P> 2 dBm, 1880 MHz T7700 Balun
Compare with good
sample
Helgo
Yes Synthesizer
Spectrum analyzer Check PA N7700
Z7800 TX2 (PA N7700
RFOut_1800/1900)
No Check Power Loop
Power = +21.6 dBm, 1880
MHz
(TXC Vpctrl 1800 1900,
DET)
Yes
Spectrum analyzer Check
RF@Test-Jig No
Pout
= +20 dBm, 1880 MHz
Antenna Switch (Z7800)
Yes
GSM 1900 TX
OK