Issue 1 11/05
COMPANY CONFIDENTIAL
27
Copyright © 2005 Nokia. All Rights Reserved.
RA-8
7 - RF Description and Troubleshooting
Nokia Customer Care
•
EGSM900 and GSM1800 low noise amplifier (LNA) are integrated.
•
IPAD substrate, including integrated coils, resistors and capacitors
The Honi can be tested by test points only.
AFC function
AFC is used to lock the transceiver’s clock to the frequency of the base station.
Transmitter characteristics
General instructions for Tx troubleshooting
Please refer to section Service Concepts in Chapter 3, Service Software Instructions.
To start Tx troubleshooting:
1. Connect the test jig MJ-83 to a computer with a DAU-9S cable or to an FPS-8
flash prommer with an XCS-4 modular cable.
Make sure that you have a PKD-1 dongle connected to the computer’s parallel port.
2. Connect a DC power supply to the module test jig (MJ-83) with an FLC-2 cable.
Note: When repairing or tuning the transmitter use external DC supply with at least
3A current capability. Set the DC supply voltage to 3.9V and set the jumper connec-
tor on test jig to "bypass" position.
3. Connect an RF cable to the RF connector of the module test jig (MJ-83) and
measurement equipment; or at least a 10dB attenuator, otherwise the PA may be
damaged. Use a spectrum analyzer as measurement equipment.
Note: The maximum input power of a spectrum analyzer is +30dBm. It is recom-
mended to use 10dB attenuator on the spectrum analyzer input to prevent any dam-
age.
4. Set the phone module to test jig and start Phoenix service software.
5. Initialize connection to the phone. (Use FBUS driver when using DAU-9S and
COMBOX driver when using FPS-8).
Item
Values (EGSM900/1800/1900)
Type
Direct conversion, nonlinear, FDMA/TDMA
LO frequency range
3520…3660 MHz / 3420…3570 MHz /
3700…3820 MHz
Output power GMSK
33 / 30 / 30 dBm 2 W / 1W peak
Output power 8-PSK
27 / 26 / 26 dBm 0.5 W / 0.4 W peak
Gain control range
min. 30 dB
Maximum phase error (RMS/peak) GMSK
Maximum EVM (RMS/peak) 8-PSK
max 5 deg./20 deg. Peak
max 10% / 30%