Nokia N70 Service Manual 7 rf troubleshooting and manual tuning guide

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

(This page left intentionally blank.)

Page 1–2 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Table of Contents

Introduction to RF troubleshooting..........................................................................................................................................1–5

RF key component placement.....................................................................................................................................................1–5

Troubleshooting test point locations.......................................................................................................................................1–7

Receiver troubleshooting...........................................................................................................................................................1–10

Introduction to Rx troubleshooting..................................................................................................................................1–10

GSM Rx chain activation for manual measurements / GSM RSSI measurement.................................................1–10

WCDMA Rx chain activation for manual measurement..............................................................................................1–11

WCDMA RSSI measurement..................................................................................................................................................1–12

Transmitter troubleshooting....................................................................................................................................................1–13

General instructions for Tx troubleshooting..................................................................................................................1–13

Checking antenna functionality.........................................................................................................................................1–16

RF tunings.......................................................................................................................................................................................1–17

Introduction to RF tunings...................................................................................................................................................1–17

RF autotuning..........................................................................................................................................................................1–18

RF autotuning....................................................................................................................................................................1–18

RF manual tuning guide.......................................................................................................................................................1–23

Required manual tunings after component changes...........................................................................................1–23

System mode independent manual tunings............................................................................................................1–24

RF channel filter calibration.....................................................................................................................................1–24

PA (power amplifier) detection..............................................................................................................................1–25

Temperature sensor calibration ............................................................................................................................1–25

GSM receiver tunings.......................................................................................................................................................1–26

Rx calibration (GSM)...................................................................................................................................................1–26

Rx band filter response compensation (GSM)....................................................................................................1–30

Rx AM suppression (GSM)..........................................................................................................................................1–36

GSM transmitter tunings.................................................................................................................................................1–39

Tx IQ tuning (GSM)......................................................................................................................................................1–39

Tx power level tuning (GSM)....................................................................................................................................1–42

RM-84 WCDMA receiver tunings....................................................................................................................................1–45

Rx AGC alignment (WCDMA).....................................................................................................................................1–45

Rx band response calibration (WCDMA)...............................................................................................................1–47

RM-84 WCDMA transmitter tunings.............................................................................................................................1–50

Tx AGC & power detector (WCDMA).......................................................................................................................1–50

Tx band response calibration (WCDMA)...............................................................................................................1–55

Tx LO leakage (WCDMA).............................................................................................................................................1–56

List of Tables

Table 1 RF channel filter calibration tuning limits.............................................................................................................1–24

Table 2 Temperature sensor calibration tuning limits.....................................................................................................1–26

Table 3 RF tuning limits in Rx calibration.............................................................................................................................1–28

Table 4 RSSI level values.............................................................................................................................................................1–38

List of Figures

Figure 1 RF key component placement....................................................................................................................................1–6

Figure 2 Test point locations for spectrum analyzer...........................................................................................................1–7

Figure 3 Test points for oscilloscope - bottom......................................................................................................................1–8

Figure 4 Test points for oscilloscope - top..............................................................................................................................1–9

Figure 5 RSSI Reading window.................................................................................................................................................1–11

Issue 1 Company Confidential Page 1–3

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Figure 6 Activating Rx Control window in Phoenix...........................................................................................................1–11

Figure 7 Rx Control window......................................................................................................................................................1–12

Figure 8 RF Controls window....................................................................................................................................................1–15

Figure 9 Tx Control window......................................................................................................................................................1–16

Figure 10 Feed and GND spots of the main antenna.........................................................................................................1–17

Figure 11 BT antenna..................................................................................................................................................................1–17

Figure 12 RF channel filter calibration typical values.......................................................................................................1–25

Figure 13 High burst measurement........................................................................................................................................1–53

Page 1–4 Company Confidential Issue 1

RM-84/99 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)

Caution: A mobile phone WCDMA transmitter should never be tested with full Tx power, if there is no

possibility to perform the measurements in a good performance RF-shielded room. Even low power WCDMA transmitters may disturb nearby WCDMA networks and cause problems to 3G cellular phone communication in wide area. WCDMA Tx measurements should be performed at least in an RF-shielded box and never with higher Tx power level than 0 dBm! Test full WCDMA Tx power only in RF-shielded environment.

Also all measurements with an RF coupler should be performed in RF shielded environment because nearby base stations can disturb sensitive receiver measurements. If there is no possibility to use RF shielded environment, it should be checked that there are no transmissions on the same frequencies as used in the tests.

The RF section of the phone is build around two RF ASICS: Rx ASIC N7500 and Tx ASIC N7501. There are also two PA’s on board, one for GSM (N7502) and another for WCDMA (N7503).

The WCDMA PA needs variable supply voltage to work properly and therefore there is a switched mode power supply component (N7504) added to the PWB.

Please note that the grounding of the PA module is directly below the PA module. Therefore, it is difficult to check or change the module.

Most RF semiconductors are static discharge sensitive! ESD protection must be taken care of during repair (ground straps and ESD soldering irons). N7501, N7500, both PAs and SMPS are moisture sensitive, so parts must be pre-baked prior to soldering.

In addition to key components, there are lot of discrete components (resistors, inductors and capacitors) which troubleshooting is done mainly by checking if the soldering of the component is done properly.

Capacitor can be checked for shorts and resistors for value by means of an ohmmeter, but be aware in-circuit measurements should be evaluated carefully.

Keep in mind that all measured voltages or RF levels depicted in the service manual are rough figures. Especially RF levels vary because of different measuring equipment or different grounding of the probe used. All spectrum analyser measurements in this manual are made with a Fluke PM9639/011 10:1 (500 ohm) probe. It is recommended that a similar kind of probe is used for all troubleshooting measurements.

When using an RF probe, use a pair of metallic tweezers to connect the probe ground to the PWB ground as close to the measurement point as possible. If measurements are performed in a product specific module jig, then “GND” pads should be used for the probe ground.

For additional RF troubleshooting instructions, see Appendix A. These instructions include descriptions/ instructions for RF self-tests as well as troubleshooting instructions for various fault cases.

RF key component placement

The RF section of the phone is build around two RF ASICs: Rx ASIC N7500 and Tx ASIC N7501. There are also two PAs on the board, one for GSM (N7502) and one for WCDMA (N7503). The WCDMA PA needs

variable supply voltage to work power efficiently and therefore there is a Switched Mode Power Supply (SMPS) component (N7504) added to the PWB.

Issue 1 Company Confidential Page 1–5

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Figure 1 RF key component placement

Page 1–6 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Troubleshooting test point locations

Test points for spectrum analyzer

Figure 2 Test point locations for spectrum analyzer

Issue 1 Company Confidential Page 1–7

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Test points for oscilloscope

Figure 3 Test points for oscilloscope - bottom

Page 1–8 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Figure 4 Test points for oscilloscope - top

Issue 1 Company Confidential Page 1–9

RM-84/99

Nokia Customer Care 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. For GSM RSSI measurement, see GSM Rx chain

activation for manual measurements / GSM RSSI measurement (Page 1–10), and for the same measurement

in WCDMA, see WCDMA RSSI measurement (Page 1–12). In GSM, the input signal can be either a real GSM signal or a CW signal that is 67.771kHz up from the carrier

frequency. For service tool usage instructions, refer to section Service Tools and Service Concepts.

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.

I and Q branches can be measured separately. In GSM, the input signal can be either real GSM signal or CW signal that is 67.771kHz up from the carrier frequency.

Steps

1. Start Phoenix service software.

2. From the Testing menu, choose GSM and RSSI Reading.

3. Set the RF signal generator for channel frequency +67.771kHz CW mode with –80dBm signal. Alternatively set cellular tester downlink channel to the appropriate channel.

Page 1–10 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

4. In the RSSI Reading window, select the appropriate band and channel.

Figure 5 RSSI Reading window

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

Results

RSSI reading values of the selected band and channel are displayed.

WCDMA Rx chain activation for manual measurement

Steps

1. Start Phoenix service software.

2. From the Testing menu, choose WCDMA and Rx Control.

Figure 6 Activating Rx Control window in Phoenix

3. In the Rx Control window:

Issue 1 Company Confidential Page 1–11

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Figure 7 Rx Control window

• From the AGC Mode pane, select Algorithm.

• Set Channel to 10700.

• Set AFC Algorithm to OFF (Default = OFF).

Next action

When settings are ready, click Start to activate them. If settings are changed later on (for example, you give a new channel number), you will need to click Stop and

Start again.

Note: Clicking Stop also disables Tx Control if that was active!

WCDMA RSSI measurement

Before you begin

WCDMA Rx must be activated before RSSI can be measured. See WCDMA Rx chain activation for manual

measurement (Page 1–11).

Steps

1. From the Testing menu in Phoenix, choose WCDMA -> Rx Power Measurement.

2. In the Rx Power Measurement window, choose the following settings:

• Mode: RSSI

• Continuous Mode

Page 1–12 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

3. To perform the measurement, click Start.

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"; in WCDMA transmitter testing the

best tool is "Tx Control".

• Tx IQ tuning and Tx power tuning can be also used in some cases.

• 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 Phoenix service software. The first section is

for the EGSM900/GSM1800/GSM1900 bands and the latter for WCDMA.

Caution: Never activate the GSM or WCDMA 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 or WCDMA PA may be damaged.

Steps

1. Connect a test jig to a computer with a DAU-9S cable or to a FPS-8 flash prommer with a 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 a product-specific module jig.

Note: When repairing or tuning a transmitter, use an external DC supply with at least 3 A current

capability. Set the DC supply voltage to 3.9 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 product-specific module test jig and measurement

equipment or alternatively use a 50 ohms (at least 2 W) dummy load in the module test jig RF connector, otherwise GSM or WCDMA PA may be damaged.

Note: There are three antenna connectors in the module jig:

• one for GSM

• one for WCDMA

• one for Bluetooth

Issue 1 Company Confidential Page 1–13

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Make sure that all connections are made to the correct RF connector.

Normally a spectrum analyser is used as measurement equipment.

Note: The maximum input power of a spectrum analyser is +30 dBm.

To prevent any damage, it is recommended to use 10 dB attenuator on the spectrum analyzer input.

4. Set Tx on. i Set the phone module to the test jig and start Phoenix service software.

ii Initialize connection to the phone. (With FPS-8 use FBUS driver when using DAU-9S and COMBOX driver). iii From the File menu, choose product: File -> Choose Product -> xx-x* (* = type designator of the phone). iv From the toolbar, set Operating mode to “Local”.

Alternative steps

• EGSM900/GSM1800/GSM1900 troubleshooting i From the Testing menu, activate the RF Controls window: Testing -> GSM -> RF Controls .

ii In the RF Controls window:

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

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

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

• Set Tx data type to “All1” (Default = “All1”).

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

• Set Edge to “Off” (Default).

• Set Tx PA mode to “Free” (Default).

• Set power level to 5 (Default = 19) on GSM900 or to 0 (Default = 15) on GSM1800 or GSM1900.

Page 1–14 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Figure 8 RF Controls window

• WCDMA troubleshooting

i From the Testing menu, activate the Tx Control window:Testing -> WCDMA -> Tx Control .

ii In the Tx Control window:

• Select the Algorithm mode tab.

• Set Start level to “0” dBm (Default = “0”).

• Set Step size, Step count and Sequence to “0” (Default = “0”).

• Set Scrambling code class to “LONG” (Default = “LONG”).

• Set Scrambling code to “16” (Default = “16”).

• Set DPDCH Code number to “0”, Code class to “2” and Weight to “15” (Defaults).

• Set DPCCH Code number to “0”, Code class to "2" and Weight to “8” (Defaults).

• Set Channel to 9750.

• Check the "DPDCH enabled" checkbox (Default).

Issue 1 Company Confidential Page 1–15

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Figure 9 Tx Control window

Next action

When settings are done, click “Send” to enable them. If you change the settings (e.g. give a new channel number), you need to click “Stop” and “Send” again.

Checking antenna functionality

The main antenna has two separate antenna elements: GSM and WCDMA.

Note: RM-99 only has the GSM antenna element.

In the GSM antenna, there is one Feed and two GND contacts. In the WCDMA antenna, there is one Feed and one GND contact. The contacts of the GSM antenna are separated in the (RDC = 0 ohm) short-circuit. The contacts of the WCDMA

antenna are in the (RDC = 0 ohm) short-circuit.

Page 1–16 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Figure 10 Feed and GND spots of the main antenna

The antenna is functioning normally when the contacts function (RDC = 0 ohm) and the antenna is visually intact.

BT antenna

BT antenna has one Feed and two GND contacts. The antenna is functioning normally when the contacts function (RDC = 0 ohm) and the antenna is visually intact.

Figure 11 BT antenna

RF tunings

Introduction to RF tunings

Phone RF is tuned in production. There is no reason to do the re-calibration unless:

• One or more of the RF components is changed

• FLASH memory chip (D3000) is changed or otherwise corrupted.

Issue 1 Company Confidential Page 1–17

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Note: RF calibration is always performed with the help of a product-specific module jig, never with

an RF coupler. Using an RF coupler in the calibration phase will cause a complete mistuning of the RF side.

Important: After RF component changes, always use autotuning. Manual tunings are only required

in rare cases.

Cable and adapter losses

RF cables and adapters have some losses. They have to be taken into account when the phone is tuned. As all the RF losses are frequency dependent, the user have to be very careful and understand the measurement setup. The following table presents the RF attenuations of the product-specific module jig:

Band Attenuation

GSM900 0.3 dB

GSM1800 0.4 dB

GSM1900 0.5 dB

WCDMA 2100 0.8 dB

RF autotuning

Before you begin

For information on the recommended test set-up, refer to the corresponding information on PWS/NOL. Before you can use the auto-tune feature, the GPIB driver from the GPIB card vendor must be installed and

running. The autotune .ini file must be in a correct place: C:\Program Files\Nokia\Phoenix\products\xx-x*

\autotune_xx-x*.ini (*= indicates the type designator of the phone, e.g. RM-1)

Context

RF autotuning is performed with the aid of Digital Radio Communication Tester. Autotuning covers all RF tunings that are needed to perform after RF component repairs.

Note: Do not perform RF autotuning without a proper reason. Phones are tuned in production and an

RF tuning may be performed only after component repairs or if the RF tuning information is lost.

Steps

1. Connect the communication tester to the GPIB bus.

2. Start Phoenix service software.

Page 1–18 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

3. From the Tools menu, choose Options -> GPIB Card.

4. In the Card Type line, select CEC8Bit, then click Start.

After clicking Start, the name of the communication tester appears in the list of found Listeners.

5. To specify the cable loss from module jig to the communication tester, choose "Set Loss" from the Tuning

menu.

Issue 1 Company Confidential Page 1–19

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

6. In the Set Loss window, click the Jig tab and select the right jig for the phone.

7. Click the Cable tab and add the extra cable attenuation.

Page 1–20 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

8. To start autotuning, choose Auto-Tune from the Tuning menu.

9. In the Auto-Tune window, click Options.

10. In the Auto-Tune options window, see that the "Enable showing of messages" check box is checked, then

click OK.

Issue 1 Company Confidential Page 1–21

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

11. Connect the phone's WCDMA RF port to the communication tester, and click Tune.

Page 1–22 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

12. Change the phone's RF adapter from WCDMA port to GSM port.

13. To complete the RF autotuning, click OK.

Results

"Autotuning completed successfully" message appears.

RF manual tuning guide

Required manual tunings after component changes

Important: After RF component changes, always use autotuning. Manual tunings are only required

in rare cases.

If, however, manual tuning is used, only relevant tunings should be performed. Refer to the following table:

Issue 1 Company Confidential Page 1–23

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Changed component Perform the following tunings

Tx RF ASIC Vinku (N7501) RF Channel Filter Calibration, Tx IQ Tuning, Tx Power

Level Tuning, Temperature Sensor Calibration, TX AGC & Power Detector, Tx Band Response Calibration, Tx LO Leakage

RX RF ASIC Hinku (N7500) RF Channel Filter Calibration, Rx Calibration, Rx Band

Filter Response Compensation, Rx AM Suppression, Rx AGC Alignment, Rx Band Response Calibration

Any component in the GSM TX RF chain before the PA Tx IQ Tuning, Tx Power Level Tuning

Any component in the GSM TX RF chain after the PA or PA

Any component in the WCDMA TX RF chain before thePATx AGC & Power Detector, Tx Band Response

Any component in the WCDMA TX RX chain after the PA, PA, power detector or PA switch mode power supply

Any component in the GSM RX chain Rx Calibration, RX Band Filter Response

Any component in the WCDMA RX chain Rx AGC Alignment, RX Band Response Calibration

VCTCXO (G7501) Rx Calibration (GSM900 band)

Tx Power Level Tuning

Calibration, Tx LO Leakage

Tx AGC & Power Detector, Tx Band Response Calibration, PA Detection

Compensation, RX AM Suppression

System mode independent manual tunings

RF channel filter calibration

Context

Rx channel filter calibration tunes Rx and Tx ASICs' internal low pass filters that limit the bandwidth of BB IQ signals.

One common calibration is made for GSM and WCDMA.

Table 1 RF channel filter calibration tuning limits

Min Typ Max

Tx filter 0 10 31

Rx filter 0 16 31

Steps

1. From the "Operating mode" dropdown menu, set mode to "Local".

2. From the Tuning menu, choose "RF Channel Filter Calibration".

3. Click Tune.

4. To save the values to the PMM (Permanent Memory) area, click Write.

5. To close the tuning window, click Close.

Page 1–24 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Results

Figure 12 RF channel filter calibration typical values

PA (power amplifier) detection

Context

PA detection procedure detects which PA manufacturer is used for GSM and WCDMA PAs. If PA is changed or if the permanent memory (PMM) data is corrupted, PA detection has to be performed before

Tx tunings.

Steps

1. From the "Operating mode" dropdown menu, set mode to "Local".

2. From the Tuning menu, choose "PA Detection".

3. Click Tune.

4. Check that the detected PA manufacturers are corresponding to the actual chips on the board.

5. To end the procedure, click Close.

Temperature sensor calibration

Context

There is a temperature sensor integrated into VINKU ASIC. VINKU provides DC-voltage, which is temperature dependent.

Temperature sensor calibration is done in room temperature, in which offset caused by VINKU variation and AD-converter inside RETU are nullified.

The module is able to do this calibration by itself, no external equipment is needed. The temperature of the module and components must be 23 +/-2 degrees.

Steps

1. From the "Operating mode" dropdown menu, set mode to "Local".

2. From the Tuning menu, choose "Temperature Sensor Calibration".

Issue 1 Company Confidential Page 1–25

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

3. Click "Tune".

Table 2 Temperature sensor calibration tuning limits

Min Typ Max Unit

-20 -4 20 V

4. To save the calibration values, click "Write".

5. To finish the calibration, click "Close".

GSM receiver tunings

Rx calibration (GSM)

Context

Rx Calibration is used to find out the real gain values of the GSM Rx AGC system and tuning response of the AFC system (AFC D/A init value and AFC slope)

Steps

1. Connect the module jig’s GSM connector to signal generator.

2. From the "Operating mode" dropdown menu, set mode to "Local".

3. From the Tuning menu, choose GSM -> Rx Calibration.

4. Check the “Load from Phone” check box and clear the “Save to Phone” check box.

5. From the Band dropdown menu, choose GSM900.

Page 1–26 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

6. Click Start (if not active already).

7. Click Calibrate.

8. Connect signal generator to the phone and set frequency and amplitude as instructed in the "Rx Calibration

with band EGSM900" popup window. The calibration uses a non-modulated CW signal. Increase the signal generator level by cable attenuation

and module jig probe attenuation!

Issue 1 Company Confidential Page 1–27

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

9. To perform tuning, click OK.

10. Check that the tuning values are within the limits specified in this table:

Table 3 RF tuning limits in Rx calibration

Min Typ Max Unit

GSM900

AFC Value -200 -105...62 200

AFC slope 0 122 200

RSSI0 106 107...110 114 dB

GSM1800

RSSI0 104 104...109 114 dB

GSM1900

RSSI0 104 104...109 114 dB

Page 1–28 Company Confidential Issue 1

RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

11. To save values to the phone, click "Save & Continue".

12. Repeat steps 3 to 8 for GSM1800 and GSM1900.

Issue 1 Company Confidential Page 1–29

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Results

Rx band filter response compensation (GSM)

Before you begin

Rx Calibration must be performed before the Rx Band Filter Response Compensation.

Context

On each GSM Rx band, there is a band rejecting filter in front of the HINKU front end. The amplitude ripple caused by these filters causes ripple to the RSSI measurement and therefore calibration is needed.

The calibration has to be repeated for each GSM band.

Steps

1. Connect the module jig’s GSM connector to the signal generator.

2. From the "Operating mode" dropdown menu, set mode to "Local".

3. Select GSM900 band.

Page 1–30 Company Confidential Issue 1

+ 156 hidden pages

Nokia N70 Service Manual 7 rf troubleshooting and manual tuning guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction to RF troubleshooting

RF key component placement

Troubleshooting test point locations

Receiver troubleshooting

Introduction to Rx troubleshooting

GSM Rx chain activation for manual measurements / GSM RSSI measurement

WCDMA Rx chain activation for manual measurement

WCDMA RSSI measurement

Transmitter troubleshooting

General instructions for Tx troubleshooting

Checking antenna functionality

RF tunings

Introduction to RF tunings

RF autotuning

RF autotuning

RF manual tuning guide

Required manual tunings after component changes

System mode independent manual tunings

RF channel filter calibration

PA (power amplifier) detection

Temperature sensor calibration

GSM receiver tunings

Rx calibration (GSM)

Rx band filter response compensation (GSM)