Fault Finding Chart For Gsm1800 Transmitter - Nokia 616 Service Manual

Nokia Customer Care

Fault finding chart for GSM1800 transmitter

Use Phoenix to select
TX_Data Type: "1" or "0"
TX Power Level: 5
Yes
Oscilloscope
R612
C627
C717
C623
C605
Yes
Oscilloscope
C715
C715
C716
C716
Yes
Oscilloscope
C702
C701
C703
C803
Yes
Spectrum analyzer
R819 in
Yes
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 5
Yes
Spectrum analyzer
L801 B1_in (PA N801
Pout_DCS)
Power = +22 dBm, 1747.8 MHz
Yes
Spectrum analyzer
RF-connector
Pout = +20 dBm, 1747.8 MHz
Yes
DCS 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
CONT1 Vdc = 2.78 Volt
CONT2 Vdc = 0 Volt
CONT3 Vdc = 0 Volt
VBD Vdc = 2.78 Volt
TX_1800 P>= -3 dBm, 1747.8 MHz
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
A
1.35 Volt
2.78 Volt No
1.8 Volt
2.78 Volt
2.78 Volt
A
67kHz
No
67kHz
67kHz
67kHz
A
No
A
No
A
A
A
A
TFE-4/RV-1
Check
Base Band
Check
Base Band
Check:
Mjoelner Serial
Interface
Mjoelner
Check
DCS Balun T701
Mjoelner
Synthesizer
Page 8b-59