Troubleshooting Diagram For Gsm850 Receiver; Fig 19 Gsm1900 Rf Controls - Nokia RH-59 Troubleshooting Instructions

Nokia Customer Care

Troubleshooting diagram for GSM850 receiver

Apply -55dBm
881.6 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
24
Figure 17:GSM850 receiver troubleshootingt
Check RX/TX
switch at
RX850
Z700
-56dBm
YES
Spectrum analyzer
GSM850 SAW filter
Z602
output
-65dBm
YES
Spectrum analyzer
check signal after
inductors
L602 and L603
-65DbM
YES
Oscilloscope
VRX 2.7V
Check Mjoelner
serial
interface
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Oscilloscope
NO
check
VC1 and VC2
at Z700
Signal = 0V
YES
Check
RX/TX
switch
NO
Check
SAW filter
Z602
NO
Check
Inductor
L603, L602
Check
NO
Baseband
RH-59/60
NO
Check Mjoelner
YES
ISSUE 1 09/2004