Troubleshooting Diagram For Gsm1900Receiver - Nokia RH-18 Troubleshooting Instructions

CCS Technical Documentation

Troubleshooting diagram for GSM1900Receiver

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 10/03
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Figure 20: GSM1900 receiver troubleshooting diagram
Check RX/TX
NO
switch at
RX1800
Z700
-56dBm
YES
Spectrum analyzer
PCN SAW filter
Z602
output
-65dBm
YES
Spectrum analyzer
check signal after
inductors
L601 and L611
-65DbM
YES
Oscilloscope
VRX 2.7V
Check Mjoelner
serial
interface
Nokia Corporation.
Oscilloscope
check
VC1 and VC2
at Z700
Signal = 0V
YES
Check
RX/TX
switch
NO
Check
SAW filter
Z601
NO
Check
Inductor
L601, L611
Check
NO
Baseband
RH-36
NO
Check Mjoelner
YES
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