Nokia RH-47 Series Rf Description And Troubleshooting page 48

RH-47
7 - RF Description and Troubleshooting
105
106 Seq_Measure_GS
M1900_Tx_Level
s
107
122
123 Seq_Tune_GSM8
50_Tx_IQ
124
125
126
127
128
129
130
131
132
133
134 Seq_Tune_GSM1
900_Tx_ IQ
135
Page 48
Company Confidential
Check_GSM1900_Tx_Coeff
0
Measure_GSM1900_MID_C
h_Levels
Check_GSM1900_MID_Ch_
Tx_Lev0
Check_GSM1900_MID_Ch_
Tx_Lev15
Set_SA_GSM850_TX_IQ_Tu
ning
Tune_GSM850_I_DC_Offset
Tune_GSM850_Q_DC_Offse
t
Tune_GSM850_I_DC_Offset
_2
Tune_GSM850_Q_DC_Offse
t_2
Tune_GSM850_IQ_Phase_Di
fference
Tune_GSM850_IQ_Amplitu
de_Difference
Tune_GSM850_IQ_Phase_Di
fference_2
Measure_GSM850_TX_IQ
Check_GSM850_TX_IQ_f0
Check_GSM850_TX_IQ_f0_
+67710
Set_SA_1900_TX_IQ_Tunin
g
Tune_GSM1900_I_DC_Offse
t
Copyright © 2004 Nokia Corporation
Company Confidential
0,75 1,0 ADC
Action
28,5 30,50 dBm
-3 3 dBm
Action
-6 6 mV
-6 6 mV
-6 6 mV
-6 6 mV
70 110 deg
-1,2 1,2 mV
70 110 deg
Action
-120 -35 dBc
-120 -40 dBc
Action
-6 6 mV
Nokia Customer Care
x
x
x
x
x Check TX850 path
around the modulator
(L706,L707,L708,
R725, R726,
R732,R733, Z701)
x
x Check TXIQ Signals
with oscilloscope
(TXIOUTP, TXIOUTN,
TXQOUTP, TXQOUTN)
x
x Check TX850 SAW fil-
ter Z604 and Buffer
Transistor V802
x
x Maybe Mjölner N601
must be replaced
x
x
x
x
x Check TX1900 path
aroung the modulator
(L705, C734, C735,
T701, L712, C721,
C722)
x
Issue 1 05/04