Troubleshooting Chart For Gsm1800Receiver - Nokia RH-59 Troubleshooting Instructions

RH-59/60
Troubleshooting chart for GSM1800 receiver
Figure 35:GSM1800 receiver troubleshooting chart
Apply -55dBm
1842.8 MHz
offset 67.71kHz
from generator
to
antenna conn
YES
Oscilloscope
at RX i/Q
signal 588mVpp
DC offset 1.35V
Freq.67.71kHz
YES
EGSM
chain
OK
ISSUE 1 09/2004
Check RX/TX
NO
switch at
RX1800
Z700
-56dBm
YES
Spectrum analyzer
EGSM SAW filter
Z601
output
-65dBm
YES
Spectrum analyzer
NO
check signal after
inductors
L601 and L611
-65DbM
YES
Oscilloscope
VRX 2.7V
NO
Check Mjoelner
serial
interface
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Oscilloscope
check
VC1 and VC2
at Z700
Signal = 0V
YES
Check
RX/TX
switch
NO
Check
SAW filter
Z602
Check
Inductor
L603, L602
Check
Baseband
Nokia Customer Care
NO
Check Mjoelner
YES
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