Nokia E62 Service Manual 07troub red

Nokia Customer Care

7 — RF Troubleshooting and

Manual Tuning Guide

Issue 1 COMPANY CONFIDENTIAL Page 7 –1

RM-88

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

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RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Table of Contents

Introduction to RF troubleshooting.....................................................................................................................7–5

RF key component placement...............................................................................................................................7–5

Receiver troubleshooting......................................................................................................................................7–9

Introduction to Rx troubleshooting................................................................................................................7–9

General instructions for RX troubleshooting..................................................................................................7–9

GSM Rx chain activation for manual measurements / GSM RSSI measurement........................................7–10

Transmitter troubleshooting..............................................................................................................................7–11

General instructions for TX troubleshooting................................................................................................7–11

TX 850/900 troubleshooting..........................................................................................................................7–14

TX 1800/1900 troubleshooting......................................................................................................................7–15

Checking antenna functionality.....................................................................................................................7–15

RF tunings.............................................................................................................................................................7–17

Introduction to RF tunings.............................................................................................................................7–17

RF autotuning..................................................................................................................................................7–17

System mode independent manual tunings.....................................................................................................7–20

Rf channel filter calibration............................................................................................................................7–20

PA (power amplifier) detection.....................................................................................................................7–21

GSM receiver tunings............................................................................................................................................7–21

Rx calibration (GSM)........................................................................................................................................7–21

Rx band filter response compensation (GSM)...............................................................................................7–25

GSM transmitter tunings......................................................................................................................................7–30

Tx IQ tuning (GSM)...........................................................................................................................................7–30

Tx power level tuning (GSM)..........................................................................................................................7–32

List of Tables

Table 12 Rf channel filter calibration tuning limits..........................................................................................7–20

Table 13 RF tuning limits in Rx calibration........................................................................................................7–24

List of Figures

Figure 42 RM-88 RF components..........................................................................................................................7–6

Figure 43 RM-88 BT component placement.........................................................................................................7–7

Figure 44 RM-88 component placement (top).....................................................................................................7–8

Figure 45 RM-88 component placement (bottom).............................................................................................7–8

Figure 46 RF Controls window............................................................................................................................7–10

Figure 47 RSSI Reading window.........................................................................................................................7–11

Figure 48 RF Controls window............................................................................................................................7–13

Figure 49 Main antenna.......................................................................................................................................7–16

Figure 50 Feed and GND spots of the main antenna........................................................................................7–16

Figure 51 Rf channel filter calibration typical values.......................................................................................7–20

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Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

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RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Introduction to RF troubleshooting

All measurements should be done using:

• spectrum analyser with a high-frequency high-impedance passive probe (LO-/reference frequencies and RF power levels)

• oscilloscope with a 10:1 probe (DC-voltages and low frequency signals)

The RF section of the phone is around RF ASIC N7505, TX FEM N7520, and all of this RF section is built inside of non-removable shields A7506, A7507. Therefore, the engine will be replaced after carefully checked power and receiver tuning at antenna port.

RF key component placement

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RM-88

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Figure 42 RM-88 RF components

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RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Figure 43 RM-88 BT component placement

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RM-88

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Figure 44 RM-88 component placement (top)

Figure 45 RM-88 component placement (bottom)

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RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

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.

In GSM, the input signal can be either a real GSM signal or a CW (Continuous Wave) signal, which is 67.771 kHz above 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 DKE-2 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 a DC power supply to a module test jig (MJ-67).

Note: Set the DC supply voltage to 12 V and set the jumper connector on the test jig's reg.pass

switch to “ON” position.

3. Connect an RF cable between the RF connector of the module test jig (MJ-67) and measurement equipment

or alternatively use a 50 ohms (at least 2 W) dummy load in the module test jig RF connector, otherwise GSM 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

Phoenix service software

ii Initialize connection to the phone. (With FPS-10 use FBUS driver when using DKE-2 and COMBOX driver). iii From the File menu, choose product: File -> Choose Product -> xx-x* (* = type designator of the

phone, scan product).

iv From the toolbar, set operating mode to “Local”.

5. EGSM900, GSM850/1800/1900 troubleshooting

i From the Testing menu, activate the

ii In the

• Select band "GSM850", “GSM900” or “GSM1800” or “GSM1900” (Default = “GSM850”).

• Set Active unit to “Rx” (Default = “Rx”).

• Set Operation mode to “Burst” (Default = “Burst”).

RF Controls

window:

RF Controls

window: Testing -> GSM -> RF Controls .

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RM-88

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

• Set Rx/Tx channel to 190 on GSM850, 37 on GSM900 band or 700 on GSM1800 band or 661 on GSM1900 (Defaults).

• Set Edge to “Off” (Default). (Not active in RXmode).

• Set Tx PA mode to “Free” (Default). (Not active in RXmode).

• Apply 942.46771 MHz (channel 37 + 67.710 kHz offset), 881.66771MHz (channel 190 + 67.710 kHz),

1842.86771 MHz (channel 700 + 67.710 kHz offset) or 1960.06771 MHz (channel 661 + 67.71 kHz) – 90 dBm signal to the RF-connector (remember to compensate for cable attenuation).

Figure 46 RF Controls window

GSM Rx chain activation for manual measurements / GSM RSSI measurement

Context

RSSI signal measurement is the main Rx troubleshooting measurement. The test measures the strength of the received signal.

Steps

1. Start

2. Choose Testing→GSM→RSSI Reading .

3. Set the RF signal generator for channel frequency +67.771 kHz CW mode with –80 dBm signal.

Phoenix

Alternatively set the cellular tester downlink channel to the appropriate channel. Make sure that the tester is set to continuous mode, not to burst mode.

service software.

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RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

4. In the

5. To start the measurement, activate GSM Rx chain, click Start.

RSSI Reading

window, select the appropriate band and channel.

Figure 47

RSSI Reading

window

Results

RSSI reading values of the selected band and channel are displayed. The RSSI level must be the same value which is set at the signal generator (-90 dBm).

If RSSI reading is far away from -90dBm, try to do RX tuning. Change engine if problem still shows up after re-tuning.

Transmitter troubleshooting

General instructions for TX troubleshooting

Context

• Tx troubleshooting requires Tx operation.

• Do not transmit on frequencies that are in use!

• Transmitter can be controlled in the local mode for diagnostic purposes.

• The most useful Phoenix tool for GSM transmitter testing is "RF Controls".

• Remember that retuning is not a fix! Phones are tuned correctly in production. The first set of steps instructs how to assemble the test setup. This setup is general for all Tx troubleshooting

tasks. Alternative steps provide specific troubleshooting instructions for

Caution: Never activate the GSM transmitter without a proper antenna load. There should be always

50 ohm load connected to the RF connector (antenna, RF-measurement equipment or at least 2 watts dummy load), otherwise GSM PA may be damaged.

Phoenix

service software.

Steps

1. Connect a test jig to a computer with a DKE-2 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.

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