Nokia 6630 Service Manual rm 1 07_rf_trouble

Nokia Customer Care

7 — RF Troubleshooting and

Manual Tuning Guide

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Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

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Table of Contents

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

RM-1 RF key component placement.........................................................................................................................................7–5

RM-1 fault finding test point locations....................................................................................................................................7–7

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

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

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

WCDMA Rx chain activation for manual measurement.............................................................................................7–11

WCDMA RSSI measurement.................................................................................................................................................7–12

Transmitter troubleshooting...................................................................................................................................................7–12

General instructions for Tx troubleshooting.................................................................................................................7–12

Checking antennae functionality......................................................................................................................................7–15

RF manual tuning guide............................................................................................................................................................7–17

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

RF autotuning with CMU200...............................................................................................................................................7–18

System mode independent manual tunings......................................................................................................................7–25

RF channel filter calibration...............................................................................................................................................7–25

PA detection............................................................................................................................................................................7–26

Temperature sensor calibration ......................................................................................................................................7–26

GSM receiver tunings..................................................................................................................................................................7–27

Rx calibration (GSM)..............................................................................................................................................................7–27

Rx band filter response compensation (GSM)...............................................................................................................7–30

Rx AM suppression (GSM).....................................................................................................................................................7–34

GSM transmitter tunings...........................................................................................................................................................7–35

Tx IQ tuning (GSM).................................................................................................................................................................7–35

Tx power level tuning (GSM)..............................................................................................................................................7–37

WCDMA receiver tunings............................................................................................................................................................7–41

Rx AGC alignment (WCDMA)................................................................................................................................................7–41

Rx band response calibration (WCDMA)..........................................................................................................................7–43

WCDMA transmitter tunings.....................................................................................................................................................7–46

Tx AGC & power detector (WCDMA)..................................................................................................................................7–46

Tx band response calibration (WCDMA)..........................................................................................................................7–51

Tx LO leakage (WCDMA)........................................................................................................................................................7–52

List of Tables

Table 4 RF channel filter calibration tuning limits.............................................................................................................7–25

Table 5 Temperature sensor calibration tuning limits.....................................................................................................7–27

Table 6 RF tuning limits in Rx calibration.............................................................................................................................7–29

List of Figures

Figure 63 RF key component placement.................................................................................................................................7–6

Figure 64 Test point locations for spectrum analyzer.........................................................................................................7–7

Figure 65 Test points for oscilloscope - bottom....................................................................................................................7–8

Figure 66 Test points for oscilloscope - top............................................................................................................................7–9

Figure 67 RSSI Reading window..............................................................................................................................................7–10

Figure 68 Activating Rx Control window in Phoenix.........................................................................................................7–11

Figure 69 Rx Control window...................................................................................................................................................7–11

Figure 70 RF Controls window..................................................................................................................................................7–14

Figure 71 Tx Control window....................................................................................................................................................7–15

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Figure 72 Main antenna, GSM and WCDMA...........................................................................................................................7–16

Figure 73 Feed and GND spots of the main antenna.........................................................................................................7–16

Figure 74 RF channel filter calibration typical values.......................................................................................................7–26

Figure 75 High burst measurement........................................................................................................................................7–49

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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.

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.

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.

RM-1 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.

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Figure 63 RF key component placement

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RM-1 fault finding test point locations

Test points for spectrum analyzer

Figure 64 Test point locations for spectrum analyzer

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Test points for oscilloscope

Figure 65 Test points for oscilloscope - bottom

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Figure 66 Test points for oscilloscope - top

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.

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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 7–10), and for the same measurement

in WCDMA, see WCDMA RSSI measurement (Page 7–12). 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. Setup RF signal generator for channel frequency +67.771kHz CW mode with –80dBm signal. Alternatively set cellular tester downlink channel to an appropriate channel.

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

Figure 67 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.

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WCDMA Rx chain activation for manual measurement

Steps

1. Start Phoenix service software.

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

Figure 68 Activating Rx Control window in Phoenix

3. In the Rx Control window:

Figure 69 Rx Control window

• From the AGC Mode pane, select Algorithm.

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

• Set Channel to 10700.

Next action

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

and Update again.

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

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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 7–11).

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

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" and 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.

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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 jig (MJ-26).

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 module test jig (MJ-26) 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 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/DCS1800/PCS1900 troubleshooting i From the toolbar, set system to “GSM”.

ii From the Testing menu, activate the RF Controls window: Maintenance -> Testing -> GSM -> RF Controls.

iii 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).

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• 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.

Figure 70 RF Controls window

• WCDMA troubleshooting i From the toolbar, set system to "WCDMA".

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

iii 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 DPDCH enabled (Default).

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• Set Channel to 9750.

Figure 71 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 antennae functionality

The main antenna has two separate antenna elements: GSM and WCDMA. In the GSM antenna, there is one Feed and two GND contacts. In the WCDMA antenna, there is one Feed and one GND contact.

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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.

Figure 73 Feed and GND spots of the main antenna

Figure 72 Main antenna, GSM and WCDMA

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.

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RF manual tuning guide

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. RF calibration is always performed with the help of module jig MJ-26. Whenever possible, automatic tuning

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

Changed component Perform 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

Tx Power Level Tuning

Calibration, Tx LO Leakage

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

Compensation, RX AM Suppression

Cable and adapter losses

RF cables and adapters have some losses. They have to be taken in 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. In the following table there are RF attenuations of the module jig, MJ-26:

Band Attenuation

GSM900 0.2 dB

GSM1800 0.3 dB

GSM1900 0.3 dB

WCDMA 2100 (WCDMA connector)

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0.5 dB

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Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

RF autotuning with CMU200

Before you begin

Recommended test set-up:

• Windows 2000 PC

• CMU200 communication tester

• USB to GPIB converter from National Instruments. Order information: 778416-01 GPIB-USB-B, NI-488.2 for

Windows 2000/XP/Me/98.

Before you can use the auto-tune feature, the GPIB driver from the GPIB card vendor must be installed and running.

Then the auto tune .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

It is possible to perform an automatic RF tuning with the aid of CMU200. Autotuning covers all RF tunings that are needed to perform after RF component repairs.

Note: Do not perform RF autotuning “just for sure”. Phones are tuned in the production and RF tuning

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

Steps

1. Connect CMU200 to the GPIB bus.

2. From the Tools menu in Phoenix, choose Options -> GPIB Card.

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

After clicking Start, the name of the CMU200 communication tester appears in the list of found Listeners.

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4. To specify the cable loss from module jig to CMU200, choose Set Loss from the Tuning menu..

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

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

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

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

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

click OK.

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10. Connect the phone's WCDMA RF port to CMU200 and click Tune.

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

To complete the RF autotuning, click OK.

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Results

"Autotuning completed successfully" message appears.

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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 4 RF channel filter calibration tuning limits

Min Typ Max Unit

TX filter 0 10 31

RX filter 0 16 31

Steps

1. From the dropdown menus, set "System mode" to Local and "Operating mode" to WCDMA, GSM or Dual.

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

3. Click Tune.

4. Click Write.

Saves tuned values to the PMM area.

5. To close the tuning window, click Close.

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Results

Figure 74 RF channel filter calibration typical values

PA detection

Context

PA detection procedure asks DSP to detect which PA manufacturer is used for GSM and WCDMA PAs. If PA is changed or if PMM data is corrupted, PA detection has to be performed before Tx tunings.

Steps

1. From the dropdown menus, set "System mode" to Local and "Operating mode" to WCDMA, GSM or Dual.

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 dropdown menus, set "Operating mode" to Local and "System mode" to WCDMA, GSM or Dual.

2. From the Tuning menu, choose WCDMA -> Temperature Sensor Calibration.

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3. Click Tune.

Table 5 Temperature sensor calibration tuning limits

Min Typ Max Unit

-20 -4 20

A popup window appears asking: “Save Values to PM”. Click “Yes”

4. 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 module jig’s GSM connector to signal generator.

2. From the dropdown menus, set "Operating mode" to Local, "System mode" to GSM, and Band to GSM900.

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

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

5. From the Band dropdown menu, choose GSM900.

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6. Click Start (if it 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!

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9. To perform tuning, click OK.

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

Table 6 RF tuning limits in Rx calibration

GSM900 Min Typ Max Unit

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

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11. To save values to the phone, check the "Save to Phone" check box and click Stop.

Next action

Repeat steps 3 to 8 for GSM1800 and GSM1900

Rx band filter response compensation (GSM)

Before you begin

Rx calibration must be done before the Rx Band Filter Response Compensation

Context

In each GSM Rx band, there’s a band rejecting filter in front of 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 module jig’s GSM connector to signal generator.

2. From the dropdown menus, set "Operating mode" to Local, "System mode" to GSM, and Band to GSM900.

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