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Nokia Customer Care
TF4 Technical Information
Company Confidential
TFE-4/RV-1
Issue 2.0 Mar/2005
Copyright
©
2005
Nokia Corporation.
Page 8b-59
Company Confidential
Fault finding chart for GSM1800 transmitter
Use Phoenix to select
TX_Data Type: "1" or "0"
TX Power Level: 5
Yes
A
Oscilloscope
R612
VREF01
Vdc = 1.35 Volt
Check
C627
VR2
Vdc = 2.78 Volt
No
Base Band
C717
TXP
V = 1.8 Volt
C623
VR5
Vdc = 2.78 Volt
C605
VR3
Vdc = 2.78 Volt
Yes
A
Oscilloscope
C715
TXIOUTP
67kHz
Vac = 0.4 Vpp, Vdc = 1.1 V
No
Check
C715
TXIOUTN
67kHz
Vac = 0.4 Vpp, Vdc = 1.1 V
Base Band
C716
TXQOUTP
67kHz
Vac = 0.4 Vpp, Vdc = 1.1 V
C716
TXQOUTN
67kHz
Vac = 0.4 Vpp, Vdc = 1.1 V
Yes
A
Oscilloscope
C702
CONT1
Vdc = 2.78 Volt
No
Check:
Mjoelner Serial
Interface
Mjoelner
C701
CONT2
Vdc = 0 Volt
C703
CONT3
Vdc = 0 Volt
C803
VBD
Vdc = 2.78 Volt
Yes
A
Spectrum analyzer
No
Check
R819 in
TX_1800
P>= -3 dBm, 1747.8 MHz
DCS Balun T701
Yes
A
Mjoelner
Use Phoenix to select
Synthesizer
TX_Data Type: Random
TX Power Level: 5
Yes
A
Spectrum analyzer
Check PA N801
L801 B1_in (PA N801
Pout_DCS)
No
Check Power Loop
L801,V801
Power = +22 dBm, 1747.8 MHz
Check TXC
Yes
A
Spectrum analyzer
Check
RF-connector
No
Directional Coupler (L801)
Pout = +20 dBm, 1747.8 MHz
Antenna Switch (Z601)
Yes
A
DCS TX
OK