Nokia RM-94 Rf Troubleshooting Instructions page 21

RM-94
6(b) - RF Troubleshooting
GMSK
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 10
Ch37
Ensure Vbatt=3.6 V
Yes
Oscilloscope
C7711
R7511
C7512
TXP testpoint
C7517
R7516
Yes
Oscilloscope
C7529
C7529
C7530
C7530
Yes
Oscilloscope
C7701
VC1
VC2
VC3
R7713
Yes
Spectrum analyzer
Z7700 out, R7704 in
Yes
Spectrum analyzer
Z7800 TX1 (PA N7700
RFOut_850/900)
Power = +24.3 dBm,
897.4 MHz
Yes
Spectrum analyzer
RF@Test-Jig
Pout
= +23 dBm, 897.4 MHz
Yes
GSM900 TX
OK
Issue 1 04/2005
Mode V = 0 Volt
VREF01
Vdc =
VR2
Vdc =
TXP
V =
VR5 Vdc =
VR3
Vdc =
TXIOUTP
Vac = 0.45 Vpp, Vdc =
TXIOUTN
Vac = 0.45 Vpp, Vdc =
TXQOUTP
Vac = 0.45 Vpp, Vdc =
TXQOUTN
Vac = 0.45 Vpp, Vdc =
VTXB_900
V = 2.78 Volt
CONT1 V = 0 Volt
CONT2
V = 0 Volt
CONT3 V = 2.7 Volt
VPCTRL_90
V = 1.17 Volt
0
RFin_850/ P>= 2 dBm, 897.4MHz
900
Compare with good
sample
Check PA N7700
No Check Power Loop
(TXC, Vpctrl900, DET)
No
Antenna Switch (Z7800)
COMPANY CONFIDENTIAL
Copyright © 2005 Nokia. All Rights Reserved.
1.35 Volt
2.78 Volt No
1.8 Volt
2.78 Volt
2.78 Volt
67kHz No
1.2 V
67kHz
1.2 V
67kHz
1.2 V
67kHz
1.2 V
No
Helgo Serial Interface
No
EGSM TX SAW Filter
Check
Nokia Customer Care
Check
Baseband
Check
Baseband
Check:
Helgo
Check
Helgo
Synthesizer
21