Nokia RH-53 Troubleshooting Instructions page 50

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Figure 38:Troubleshooting chart for GSM1800 receiver
Apply -55dBm
1842.8MHz
(ch 700)
Offset 67.71kHz
from generator to X700
Osciloscope at
RX I/Q.
Signal 580mVpp
DC offset 1.35V
Freq. 67.71kHz
No
Spectrum analyser
RX level (FEM, N700) at
RX1800/1900 point
-56 dBm
Yes
Spectrum analyser
SAW filter Z601 output
-65dBm
Yes
Spectrum analyser
Check signal after inductors
L610 and L612
-65dBm
Yes
Osciloscope
VRX 2.78 Vdc (C225)
Check Mjoelner serial
interface
50
Yes GSM1800 OK
Osciloscope
check VC1, VC2, Vtx and
No
BS, according to logic table
at N700
Yes
No Check Z601
Check inductor
No
L610, L612
No Check UEM, UPP
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Check Mjoelner
No
N600
Check FEM
N700
Yes
ISSUE 1 09/2004
RH-53/54