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Receiver Troubleshooting; Introduction To Rx Troubleshooting; General Instructions For Rx Troubleshooting - Nokia RM-272 Service Manual

Nokia 3500c mobile terminal
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RM-272; RM-273
RF Troubleshooting and Manual Tuning Guide

Receiver troubleshooting

Introduction to RX troubleshooting

Rx can be tested by making a phone call or in the local mode. For the local mode testing, use Phoenix service
software.
The main Rx troubleshooting measurement is RSSI measurement. This test measures the signal strength of
the received signal. I and Q branches can be measured separately.
In GSM, the input signal can be either a real GSM signal or a CW signal that is 67.71kHz up from the carrier
frequency.
For service tool usage instructions, refer to section Service Tools and Service Concepts.

General instructions for RX troubleshooting

Steps
1. Connect a test jig to a computer with a DAU-9S cable or to a FPS-10 flash prommer with a modular cable
(XCS-4).
Make sure that you have a PKD-1 dongle connected to the computer's parallel port.
2. Connect CU-4 with 12 V supply. The DC supply voltage is set to 3.7 V by default (in Phoenix).
3. Connect an RF cable between the RF connector of the module test jig (MJ-122) and measurement
equipment or alternatively use a 50 Ω (at least 2 W) dummy load in the module test jig RF connector,
otherwise the RF part may be damaged.
Note:
Make sure that all connections are made to the correct RF connector.
4. Set Rx on.
i
Set the phone module to the test jig and start
ii Initialize connection to the phone. (With the FPS-10 prommer use FPS10_USB or FPS10_TCP drivers,
depending on connection type. When using DAU-9S select FBUS).
iii From the File menu, choose product: File -> Choose Product -> xx-x* (* = type designator of the
phone, eg. RM-272/273), or press Ctrl + R to scan product.
iv From the toolbar, set operating mode to "Local".
5. EGSM850/900/1800/1900 troubleshooting
i
From the Testing menu, activate the
Issue 1
Figure 19 The visual differences between BOM1 and BOM3
RF Controls window: Testing -> GSM -> RF Controls .
COMPANY CONFIDENTIAL
Copyright © 2007 Nokia. All rights reserved.
Phoenix service software .
Page 4 –9
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