Troubleshooting Diagram For Gsm1900Receiver; Fig 22 Rx Measurements Point At The Rx/Tx Switch - Z700; Fig 23 Measurements Points At The Rx-Filters - Z601/Z602 - Nokia RH-59 Troubleshooting Instructions

RH-59/60
Troubleshooting diagram for GSM1900 receiver
Figure 20:GSM1900 receiver troubleshooting diagram
Apply -55dBm
1960.0 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
GSM850
chain
OK
ISSUE 1 09/2004
Check RX/TX
NO
switch at
RX1900
Z700
-56dBm
YES
Spectrum analyzer
PCN SAW filter
Z602
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
Z601
Check
Inductor
L601, L611
Check
Baseband
Nokia Customer Care
NO
Check Mjoelner
YES
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