Nokia RH-6 Series Rf Description & Troubleshooting page 22

RH-6
7 - RF Description & Troubleshooting
Now the measurement equipment should measure the following output signal from the
phone:
P = +23dBm @ 897.4MHz
out
If this is not the case, then go to the next chapter for finding the fault.
Fault finding chart for EGSM900 transmitter
In following, it is assumed that the TXP signal is used as trigger-signal. For that a TXP
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
Page 22
Company Confidential
VREF01 Vdc =
VR2 Vdc =
TXP V =
VR5 Vdc =
VR3 Vdc =
TXIOUTP
Vac = 0.4 Vpp, Vdc
TXIOUTN
Vac = 0.4 Vpp, Vdc
TXQOUTP
Vac = 0.4 Vpp, Vdc
TXQOUTN
Vac = 0.4 Vpp, Vdc
VTXB_900 Vdc = 2.78 Volt
CONT1
CONT2
CONT3 Vdc = 2.78 Volt
VBD
Copyright © 2003 Nokia Corporation.
Company Confidential
CCS Technical Documentation
1.35 Volt
2.78 Volt
1.8 Volt
2.78 Volt
2.78 Volt
67kHz
= 1.1 V
67kHz
= 1.1 V
67kHz
= 1.1 V
67kHz
= 1.1 V
Vdc = 0 Volt
Vdc = 0 Volt
Vdc - 2.78 Vol
No Check
baseband
Check
No
Baseband
Check:
Mjoelner Serial
No Interface
Mjoelner
Issue 1 10/2003