Fault Finding Chart For Egsm900 Transmitter - Nokia 616 Service Manual

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Fault finding chart for EGSM900 transmitter

The TXP signal is intended to be used as trigger, a test point is provided.
Use Phoenix to select
TX_Data Type: "1" or "0"
TX Power Level: 10
Yes
Oscilloscope
R612
C627
C717
C623
C605
Yes
Oscilloscope
C715
C715
C716
C716
Yes
Oscilloscope
R823
C702
C701
C703
C803
Yes
Spectrum analyzer
Z701 out, R806 in
Yes
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 10
Yes
Spectrum analyzer
L801 B1_in (PA N801
Pout_GSM)
Power = +25 dBm, 897,4 MHz
Yes
Spectrum analyzer
RF-connector
Pout =+23 dBm, 897,4 MHz
Yes
EGSM TX
OK
Issue 2.0 Mar/2005
Company Confidential
VREF01 Vdc =
VR2 Vdc =
TXP V =
VR5 Vdc =
VR3 Vdc =
TXIOUTP
Vac = 0.4 Vpp, Vdc = 1.1 V
TXIOUTN
Vac = 0.4 Vpp, Vdc = 1.1 V
TXQOUTP
Vac = 0.4 Vpp, Vdc = 1.1 V
TXQOUTN
Vac = 0.4 Vpp, Vdc = 1.1 V
VTXB_900 Vdc = 2.78 Volt
CONT1 Vdc = 0 Volt
CONT2 Vdc = 0 Volt
CONT3 Vdc = 2.78 Volt
VBD Vdc = 2.78 Volt
TX_900 P>= -3 dBm, 897,4 MHz
Compare with good sample
Check PA N801
Check Power Loop
No
L801,V801
Check TXC
Check
No Directional Coupler (L801)
Antenna Switch (Z601)
Copyright © 2005 Nokia Corporation.
Company Confidential
TF4 Technical Information
n
1.35 Volt
2.78 Volt No
1.8 Volt
2.78 Volt
2.78 Volt
n
67kHz
No
67kHz
67kHz
67kHz
n
No
n
No
n
TFE-4/RV-1
Check
Base Band
Check
Base Band
Check:
Mjoelner Serial
Interface
Mjoelner
Check
EGSM TX SAW Filter
Mjoelner
Synthesizer
n
n
n
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