Troubleshooting Chart For Gsm900 Transmitter - Nokia RH-53 Troubleshooting Instructions

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Measure the output power of the phone; it should be around 32.5 dBm for low band and 29.5
dBm for highband. Remember the loss in the jig; around 0 dB for the low band and 0.1 dB for
the high band.

Troubleshooting chart for GSM900 transmitter

For the spectrum analyzer measurements in the following chart use the 500ohm passive probe
giving an approximately 20 dB lower reading than indicate in the following figures. Since the
signal measured is bursted it is advised to set the analyzer to maxhold.
Figure 44:Troubleshooting chart for GSM900 transmitter
Signal ok on
GSM tester
No
SPA Burst Yes
Power
No
Check PA input Yes
power
No
Output power
Mjoelner
No
Check I/Q, PLL,
TXC, DC
56
Yes
Check frequency,
TXC, PLL, Vdet, I/
Q
Signal ok on Yes
GSM tester
No
Check I/Q
Yes
Z603/R714
(T600/R711)
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
laccording to
tuning working
Change FEM
Change FEM,
loop, Z603/T600
RH-53/54
Power
Yes
level
Yes
No
TX Power
No
Check DC Yes
signals
No
ISSUE 1 09/2004
Check channels
and bands
Change FEM
(N700)