User Guide

CCS Technical Documentation Troubleshooting - RF
RH-48
Issue 1 11/2003 © 2003 Nokia Corporation Confidential Page 21
6 Use a spectrum analyzer to test TP3 (I+,I-, Q+, Q-). Set the S.A to 300KHz center
frequency, 200KHz SPAN, and +10dBm reference level. The spectrum analyzer
should read –8dBm without any settings to the PDM.
Use the following CDMA Generator Code Domain Setup table to configure the CDMA
generator code domain.
The following Rx IF Troubleshooting table shows the steps for Rx IF troubleshooting.
CDMA Generator Code Domain Setup
Channel Power
Walsh
code
Pilot -7dB 0
Paging -12dB 1
Traffic -15.6dB 10
Sync -16dB 32
Rx IF Troubleshooting
Step # Part* Function
Typical Value/
Frequency
HP85024A
Typical Value
Frequency
Prod Probe
Comments
TP1 L702R IF-IN +1.3 dBm/
183.6MHz
-12/-27 dBm
183.6MHz
I.F Input to Z701 (I.F filter).
NOT 50 ohm
TP2 L701L/R SAW Out -16 dBm/
183.6MHz
-35/-50 dBm
183.6MHz
Differential outputs of Z701.
NOT 50 ohm
TP3 I+, I-, Q+, Q- I/Q out-
puts of
Yoda N700
300KHz tone
for input:
881.22MHz
-69/-84 dBm
300KHz
Baseband differential outputs of
the IF IC (N700). To test: set the
input to 881.22 or 881.82MHz/
-75dBm to get a 300KHz tone
when receiver is on channel 384
(881.52MHz)
TP4 C728T 19.2MHz
In
+6.5 dBm
19.2MHz
-22 dBm
19.2MHz
Sine wave input to N700 from
VCTCXO.
TP5 C711T 19.2MHz
Out
+4 dBm
19.2MHz
-25 dBm
19.2MHz
Square wave output of N700 to
baseband.
TP6 L708R (L708R
for Prod Probe)
VHF VCO +1.0 dBm
367.2MHz
-61 dBm
367.2MHz
Rx VHF VCO - Fixed at
367.2MHz (Be careful not to
load the circuit with the probe.)
TP7 C731T VREF 1.35Vdc System reference voltage
1.35Vdc from UEM.
TP8 R702L (C703R) RX_IF_AGC 0.2 to 1.8 Vdc AGC control Voltage. 0.2V =
Max Gain, 1.8V = Minimum Gain