Nokia 3105 Manual Do Serviço
RH-48
Troubleshooting - RF
CCS Technical Documentation
Page 10
©
2003 Nokia Corporation Confidential
Issue 1 11/2003
Figure 7: RF PDM dialog box for Tx troubleshooting
14 Ensure that the Phone Tx Pout = +25dBm and the current = 770-860mA.
Cell Transmitter Path
The following table indicates the test points to probe when troubleshooting the cell
transmitter path. It is recommended that you follow the steps in order. An HP high fre-
quency probe was used to make the frequency and output power measurements.
transmitter path. It is recommended that you follow the steps in order. An HP high fre-
quency probe was used to make the frequency and output power measurements.
Cell Transmitter Test Path
Test
Point
Part*
Function
Typical Value/
Frequency
HP85024A
Typical Value
Frequency
Prod Probe
Comments
T1
Z601 pin1
Jedi-Out
-43dBm/
836.52MHz
836.52MHz
-13.2dBm/
836.52MHz
836.52MHz
Output of Jedi Driver, Input to Tx
SAW Filter
SAW Filter
T2
Z601 pin 3
PA-In
-25dBm/
836.52MHz
836.52MHz
-15.4dBm/
836.52MHz
836.52MHz
Output of Tx SAW, Input to PA
T3
N803 pin 8
PA-Out
5.0dBm/
836.52MHz
836.52MHz
18.3dBm/
836.52MHz
836.52MHz
Output of PA, Input to Isolator
T4
Z803T
Iso-Out
2.2dBm/
836.52MHz
836.52MHz
10.3dBm/
836.52MHz
836.52MHz
Output of Isolator, Input to
Duplexer
Duplexer
T5
C603L
IF-Out
-29dBm/
228.6MHz
228.6MHz
-24dBm/
228.6MHz
228.6MHz
Tx IF Probing Point at IF Filter
T6
C638T, C654T,
C633R, C635R,
C603LR
C633R, C635R,
C603LR
VR5
2.7V dc
VHF VCO/PLL, IQ modulator sup-
ply from UEM
ply from UEM
T7
C655R
VR7
2.7V dc
UHF PLL Supply from UEM