Nokia RH-18 - Batteries

RH-36 Company confidential
CCS Technical Documentation
Page 22 Nokia Corporation. Issue 1 10/03
Troubleshooting diagram for GSM850 Receiver
Figure 17: GSM850 Receiver troubleshootingt
Apply -55dBm
942.4 MHz
offset 67.71kHz
from generator
to
antenna conn
Oscilloscope
at RX i/Q
signal 588mVpp
DC offset 1.35V
Freq.67.71kHz
YES
YES
NO NO
YES
YES
EGSM
Check RX/TX
Oscilloscope
Check Mjoelner
Check
chain
OK
switch at
RX900
Z700
-56dBm
check
VC1 and VC2
at Z700
Signal = 0V
RX/TX
switch
Spectrum analyzer
Spectrum analyzer
Oscilloscope
Check
Check
EGSM SAW filter
Z602
output
-65dBm
NO
YES
NO
YES
NO
YES
SAW filter
Z602
Inductor
L603, L602
check signal after
inductors
L602 and L603
-65DbM
VRX 2.7V
Check Mjoelner
serial
interface
Baseband
Check