Nokia N70 Service Manual 7 rf troubleshooting and manual tuning guide

RM-84/99

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

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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

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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

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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.

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.

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Figure 1 RF key component placement

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Troubleshooting test point locations

Test points for spectrum analyzer

Figure 2 Test point locations for spectrum analyzer

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Test points for oscilloscope

Figure 3 Test points for oscilloscope - bottom

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Figure 4 Test points for oscilloscope - top

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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.

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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:

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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

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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

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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.

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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).

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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.

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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.

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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.

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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.

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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.

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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.

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

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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:

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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.

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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".

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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.

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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!

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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 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

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

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

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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.

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4. From the Tuning menu, choose GSM -> Rx Band Filter Response Compensation.

5. In the Tuning mode pane, select Manual.

6. Click Start.

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7. Click Save & Continue.

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

Filter Response Compensation for EGSM900" popup window.

9. To perform tuning, click OK.

10. Go through all 9 frequencies.

11. Check that the tuning values are within the limits specified in the following table:

Min Typ Max Unit

GSM900

Ch. 965 /

923.26771 MHz

Ch. 975 /

925.26771 MHz

Ch. 987 /

927.66771 MHz

Ch. 1009 /

932.06771 MHz

Ch. 37 / 942.46771 MHz

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-10 -1 5 dB

-3 0 5 dB

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Min Typ Max Unit

Ch. 90 / 953.06771 MHz

Ch. 114 /

957.86771 MHz

Ch. 124 /

959.86771 MHz

Ch. 136 /

962.26771 MHz

GSM1800

Ch. 497 /

1802.26771 MHz

Ch. 512 /

1805.26771 MHz

Ch. 535 /

1809.86771 MHz

Ch. 606 /

1824.06771 MHz

Ch. 700 /

1842.86771 MHz

-3 0 5 dB

-10 -1 5 dB

-3 0 5 dB

Ch. 791 /

1861.06771 MHz

Ch. 870 /

1876.86771 MHz

Ch. 885 /

1879.86771 MHz

Ch. 908 /

1884.46771 MHz

GSM1900

Ch. 496 /

1927.06771 MHz

Ch. 512 /

1930.26771 MHz

Ch. 537 /

1935.26771 MHz

Ch. 586 /

1945.06771 MHz

Ch. 661 /

1960.06771 MHz

-3 0 5 dB

-10 -1 5 dB

-3 0 5 dB

Ch. 736 /

1975.06771 MHz

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Min Typ Max Unit

Ch. 794 /

1986.66771 MHz

Ch. 810 /

1989.86771 MHz

Ch. 835 /

1994.86771 MHz

12. If the values are within the limits, click "Save & Continue".

-3 0 5 dB

-10 -1 5 dB

13. Repeat the steps 4 to 10 for GSM1800 and GSM1900.

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Results

Rx AM suppression (GSM)

Context

Rx AM suppression is used to tune the AM suppression capabilities of the GSM receiver. AM suppression is related to ability of the receiver to operate when there is a disturbing AM modulated signal

near the received channel signal frequency. RFIC has tunable compensation circuit which has an effect on the AM suppression ability. In Rx AM suppression, a continuous useful signal accompanied with an AM modulated signal 10MHz above the

current channel is fed to the antenna. RFIC control word values are iterated until a minimum RSSI signal is found.

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. From the Tuning menu, choose GSM -> Rx AM Suppression.

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4. Select GSM900 band.

5. Click Start.

6. Connect the signal generator to the phone according to the frequency and modulation parameters

displayed in the pop-up window:

Frequency 952.46771MHz / 1852.86771MHz / 1970.06771

MHz (depending on the band used)

Power level -25 dBm / -26 dBm / -29 dBm (increase by cable

and jig attenuations)

Modulation AM

AM modulation depth 90%

Modulation signal 50 kHz sinewave (or 15 kHz if 50 kHz is not

available)

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7. Click OK.

8. Check that RSSI level value is between the limits presented in the following table.

Table 4 RSSI level values

Band Min Max Unit

GSM900 -115 -90 dB

GSM1800 -115 -85 dB

GSM1900 -115 -100 dB

9. To proceed to the next band, click "Next".

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10. To end the tuning, click "Finish" and "Close".

GSM transmitter tunings

Tx IQ tuning (GSM)

Context

• The Tx path branches to I and Q signals at RF I/Q modulator. Modulator and analog hardware located after

it cause unequal amplitude and phase disturbance to I and Q signal paths. Tx IQ tuning balances the I and Q branches.

• Tx IQ tuning must be performed on all GSM bands.

Steps

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

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2. From the Tuning menu, choose GSM -> Tx IQ Tuning.

3. Set "Mode" to Automatic and "Edge" to Off.

4. Click Start. Wait until automatic tuning has finished and moved the sliders. Values are written to the phone memory automatically.

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5. When the values have been written to the phone memory, click Next to change to the next band.

6. When all bands have been tuned, click Finish and Close to end the tuning procedure.

Next action

Tuning sliders should be close to the center of the scale after the tuning and within the limits specified in the following table. If they are not within the limits, check Tx IQ quality manually.

Min Typ Max Unit

GSM900

I DC offset / Q DC offset

Ampl -1 0 1 dB

Phase 85 90 95 dB

GSM1800/GSM1900

I/Q DC -6 0.5 6 dB

Ampl -1 0 1 dB

Phase 95 100 110 dB

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Tx power level tuning (GSM)

Context

Because of variations at IC process and discrete component values, the actual transmitter RF gain of each phone is different. Tx power level tuning is used to find out mapping factors called 'power coefficients’. These adjust the GSM transmitter output power to fulfill the specifications.

In dual or triple band phones, the power level tuning is made for both high and low PA Modes (Power Amplifier Mode) in the GSM900 band but only for high PA mode in GSM1800/GSM1900 bands

For EDGE transmission the bias settings of the GSM PA are adjusted in order to improve linearity. This affects the PA gain and hence the power levels have to be aligned separately for EDGE transmission.

Tx power level tuning has to be performed on all GSM bands.

Steps

1. Connect the phone to a spectrum analyzer.

2. Start Phoenix service software.

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

4. From the Tuning menu, choose GSM -> Tx Power Level Tuning.

5. Set the spectrum analyzer for power level tuning:

Frequency channel frequency (897.4MHz GSM900, 1747.8MHz

GSM1800, 1880MHz GSM1900)

Span 200 kHz

Sweep time 3s

Trigger Video triggering: Free run

Resolution BW 3 kHz

Video BW 3 kHz

Reference level offset sum cable attenuation with module jig

attenuation

Reference level 33dBm

A power meter with a peak power detector can be also used. Remember to take the attenuations in the account!

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6. Click Start.

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7. Adjust power levels 5, 15 and 19 to correspond the "Target dBm" column by pressing + or – keys.

Check that the coeffiecient values are within the limits specified in the following table.

Min Typ Max

GSM900 EDGE off

PL5 coefficient 0.45 0.626 0.73

PL15 coefficient 0.234

PL19 coefficient 0.12 0.195 0.3

GSM900 EDGE on

PL8 coefficient 0.35 0.419 0.6

PL15 coefficient 0.247

PL19 coefficient 0.12 0.204 0.3

GSM1800 EDGE off

PL0 coefficient 0.45 0.51 0.7

PL11 coefficient 0.219

PL15 coefficient 0.12 0.185 0.3

GSM1800 EDGE on

PL2 coefficient 0.35 0.394 0.6

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Min Typ Max

PL11 coefficient 0.23

PL15 coefficient 0.12 0.194 0.3

GSM1900 EDGE off

PL0 coefficient 0.45 0.482 0.7

PL11 coefficient 0.218

PL15 coefficient 0.12 0.184 0.3

GSM1900 EDGE on

PL2 coefficient 0.35 0.377 0.6

PL11 coefficient 0.23

PL15 coefficient 0.12 0.193 0.3

8. If the values are within the limits, click "Save & Continue" to proceed to the next band and click Start.

9. Set Edge mode on and start tuning again. Change video averaging to 50.

10. Tune EDGE power levels to the corresponding target power levels.

Only power levels 8, 15 and 19 are tuned in GSM900 and 2, 10 and 15 in GSM1800/1900.

11. When the tuning is completed, close the Tx Power Level Tuning window.

RM-84 WCDMA receiver tunings

Rx AGC alignment (WCDMA)

Context

Rx AGC alignment tuning is used to find out the real gain values of the WCDMA Rx AGC system and converters.

Steps

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

2. From the Tuning menu, choose WCDMA -> Rx AGC Alignment.

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3. Click Start and Tune.

4. Setup the signal generator to correspond the values in the "RX AGC Calibration" pop-up window and click OK:

Frequency: 2141MHz

Level: –51 dBm + cable and adapter attenuations

Modulation: FM

Deviation: 500 kHz

Modulation frequency: 50 kHz

5. Check that the “Rx Chain” value in “Tuning Results” is within the limits presented in the following table.

Min Typ Max Unit

RX chain -6 1.5 3.5 6 dB

Low freq -5 -0.7 4.0 5

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Min Typ Max Unit

High freq -5 -0.7 4.0 5

i If the Rx gain is acceptable, click Yes to save the results to the phone.

6. To close the tuning window, click Close.

Rx band response calibration (WCDMA)

Context

There is a band rejecting filter for each WCDMA Rx band between the front end LNA and the mixer of HINKU. The amplitude ripple caused by this filter causes ripple to the RSSI measurement and therefore Rx band response calibration is needed.

Rx band response calibration can be done in two different ways. If the signal generator in use supports frequency sweep table, the calibration can be done as a part of Rx calibration. If not, it is possible to calibrate all the necessary frequencies one by one.

The first set of steps shows how to perform the calibration without the signal generator sweep feature and the alternative steps give instructions how to perform the calibration if the signal generator supports frequency sweeps and the calibration can be performed within Rx AGC calibration.

Steps

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

2. From the Tuning menu choose WCDMA -> Rx Band Response Calibration.

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3. Click Start and Tune.

4. Setup the signal generator to correspond the values in the pop-up window:

Frequency: 2113.4MHz

Level: –48 dBm + cable and adapter attenuations

Modulation: FM

Deviation: 500 kHz

Modulation frequency: 50 kHz

5. Click OK.

6. Change frequency to 2166.6 MHz and click OK.

7. Check that the tuned values are within the limits specified in the table below:

Min Max

Frequency compensation low -5 +5

Frequency compensation high -5 +5

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i If the values are OK, click Yes to save the values.

8. Close the tuning window.

Alternative steps

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

• From the Tuning menu, choose WCDMA -> Rx AGC Alignment.

• Click Start.

• Check the “Tune Rx Band Response” checkbox and click Tune.

• Setup the signal generator according to the values in the pop-up window:

Frequency list: 2113.4 MHz, 2141 MHz and 2166.6 MHz

Dwell time: 2 ms

Sweep control: Automatic continuous sweep

Level: –48 dBm + cable and adapter attenuations

Modulation: FM

Deviation: 500 kHz

Modulation frequency: 50 kHz

• Click OK.

• Check that the “Rx chain” , “Low freq.” and “High freq.” values in the Tuning Results window are within the

limits presented in the following table.

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Min Typ Max Unit

Rx chain -6 1.5... 3.5 6 dB

Low freq -5 -0.7...4.0 5

High freq -5 -0.7...4.0 5

• If the Rx gain is acceptable, click Yes to save the results to the phone.

• To end the calibration, click Close.

RM-84 WCDMA transmitter tunings

Tx AGC & power detector (WCDMA)

Context

Tx AGC & power detector tuning has two purposes:

• to enable the phone to select the correct TxC value accurately in order to produce the required RF level

• to enable the phone to measure its own transmitter power accurately

There are two ways to perform the tuning. For an alternative method, see Alternative steps.

Steps

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

2. From the Tuning menu, choose WCDMA -> Tx AGC & Power Detector.

3. Click Start.

4. In the "Wide Range" pane, click Tune (the leftmost Tune button).

5. Setup the spectrum analyzer in the following way:

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6. After setting the spectrum analyzer, click OK.

7. Measure the power levels with a marker.

Take the first measurement from 250 us after the trigger, the second from 750 us, the third on 1225 us and so on in every 500 us until the table is filled.

Note: It must be possible to measure power levels down to –68 dBm. The measured power levels must

be monotonously decreasing. Make sure that the marker is not measuring the level of noise spike on lower levels.

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8. Fill in the power level values (in dBm) to the Wide Range table.

9. In the "Wide Range pane", click Calculate.

10. In the "High Burst" pane, click Tune.

11. Adjust the spectrum analyzer according to the following settings:

12. Measure the power levels with a marker.

Take the first measurement from 250 us after the trigger, the second from 750 us, third on 1225 us and so on in every 500 us until the table is filled.

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Figure 13 High burst measurement

13. In the "High Burst" pane, click Calculate.

14. Check that the calculated values are within the limits specified in the following table:

Min Max

C0-high -0.5 5

C1-high -50 50

C2-high 400 900

C0-mid -0.7 0.7

C1-mid 0 50

C2-mid 400 900

C0-low -4 4

C1-low -400 440

C2-low -10000 15000

Det-k 0 800

Det-b -1000 1000

15. To save the coefficients to the phone, click Write.

16. To close the tuning window, click Close.

17. From the Testing menu, choose WCDMA -> Tx Control.

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18. Select the Algorithm mode tab.

19. Write the target power level 25 dBm to the "Start level" line and check the "Max power limit" check box

(detector calibration check).

20. Setup the spectrum analyzer with the following settings:

Center frequency: 1950.0 MHz

Span: 0 Hz

Reference level offset: Cable attenuations + adapter attenuation

Reference level: 24 dBm or -20 dBm depending on the level

measured

Input attenuation: Automatic

Resolution bandwidth: 5 MHz

Video bandwidth: 5 MHz

Sweep time: 20 ms

Detector: RMS detector

Average: No

Trigger: Free run

21. Click Send.

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22. Measure the WCDMA output power.

It should be around 21 dBm.

23. Click RF Stop and uncheck the "Max power limit" check box.

24. Repeat steps 19 to 23 for levels +19, +7, 0, -20 and –40 dBm levels.

The measured output power may not differ more than +-2 dB from the requested value at level +19dBm and no more than +-4dB on lower levels.

Remember to stop the RF before sending new data.

Alternative steps

• Measure the wide range levels normally and write down the levels that are possible to measure.

• Click Finish.

• Click Options.

• Change the first wide range DAC value to 573 and change the number of tuning steps to 21.

• Change the spectrum analyzer reference level to –20 dBm and adjust the input attenuator to the lowest

value possible.

• In the "Wide Range" pane, click Tune and fill in the rest of values starting from the 19th level.

Tx band response calibration (WCDMA)

Context

Tx band response calibration is required to get compensation parameters for DSP algorithm in order for it to handle frequency response variations (caused by SAW filter, PA and duplexer unidealities) in open loop power control and maximum power limitation situations.

Steps

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

2. From the Tuning menu, choose WCDMA -> Tx Band Response Calibration.

3. Setup the spectrum analyzer according to the following settings:

Frequency: 1950.3 MHz

Span: 100 MHz

Reference level offset: Cable attenuations + adapter attenuation

Reference level: 30 dBm

Input attenuation: Default

Resolution bandwidth: more than 4.7 MHz (i.e. 5MHz)

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Video bandwidth: more than 4.7 MHz (i.e. 5MHz)

Trigger: Free run

Markers: 1922.4 MHz, 1950.0 MHz and 1977.6 MHz

4. Click Start and OK.

5. Adjust the "Mid Channel Power Level" to 21.0 dBm.

6. Click Accept and OK.

7. Read the marker power level on the low channel and fill it in to the “Low Power Level” line.

8. Click Accept and OK.

9. Read the marker power level on the high channel and fill it in to the “High Power Level” line.

10. Click Accept.

11. Check that the tuned values are within the limits presented in the following table. If they are OK, click Yes.

Min Max

Tx Freq Comp (the first and last value)

12. Close the tuning window.

-4 +4

Tx LO leakage (WCDMA)

Context

The purpose of Tx LO leakage tuning is to minimize the carrier leakage of the IQ-modulator which is caused by the DC offset voltages in the Tx IQ-signal lines and in the actual IQ-modulator.

The tuning improves WCDMA Tx AGC dynamics at low power levels. A self-calibration routine selects the best combination for internal control words in order to produce minimum LO leakage.

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Steps

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

2. From the Tuning menu, choose WCDMA -> Tx LO Leakage.

3. Click Tune.

4. To end the tuning, click Close.

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Appendix A: Additional RF

Troubleshooting Instructions

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Appendix A: RF Troubleshooting

Table of Contents

1. Using these instructions...................................................................................................................4

2. RF Self tests ..................................................................................................................................... 5

2.1 RF-BB interface (ST_CDSP_RF_BB_IF_TEST) ....................................................................................7

2.2 Supply test for Hinku and Vinku (ST_CDSP_RF_SUPPLY_TEST) ........................................................9

2.3 TX IQ self test (ST_CDSP_TX_IQ_TEST) .........................................................................................13

2.4 TXC Data test (ST_TXC_DATA_TEST) ............................................................................................14

2.5 WCDMA power detector biasing self test (ST_CDSP_PWR_DETECTOR_BIAS_TEST) ..........................15

2.5.1 WCDMA power detector ok?..............................................................................................15

2.6 RX PLL phase lock self test (ST_CDSP_RX_PLL_PHASE_LOCK_TEST) .................................................17

2.7 TX PLL phase lock self test (ST_CDSP_TX_PLL_PHASE_LOCK_TEST) .................................................18

2.8 WCDMA transmitter self test (ST_CDSP_WCDMA_TX_POWER_TEST)...............................................19

2.9 RX IQ loop back self test (ST_CDSP_RX_IQ_LOOP_BACK_TEST) .......................................................20

2.10 GSM transmitter self test (ST_CDSP_GSM_TX_POWER_TEST)......................................................21

2.11 Error Code Interpretation Examples......................................................................................22

2.11.1 Example 1 ........................................................................................................................ 22

2.11.2 Example 2 ........................................................................................................................ 22

2.11.3 Example 3 ........................................................................................................................ 22

3. Does the phone register to the network and make a call (GSM)? .....................................................24

3.1 GSM transmitter power levels and transmit frequency ok? .......................................................24

3.1.1 Does GSM TX transmit RF-power at all? .............................................................................24

3.1.2 Does GSM TX transmit enough RF-power and power levels otherwise ok? .........................35

3.1.3 GSM transmitter frequency correct?..................................................................................44

3.2 Does the phone give realistic RSSI-values? ...............................................................................48

3.2.1 Is Hinku (N7500) ASIC receiving RF-power correctly from the GSM-antenna connector?......49

3.2.2 Are RX-IQ signal waveforms and levels correct? ................................................................51

3.2.3 Is RAP3G ASIC getting ok VREFCM-signal from Hinku (N7500)? Signal level ok? ...................62

3.2.4 RAP3G faulty?...................................................................................................................63

3.3 GSM Transmitter phase error ok? .............................................................................................63

3.3.1 Are capacitors in Vinku REG1 and REG2 lines in place? .......................................................64

3.3.2 Are capacitors in GSM PA power supply line in place? ........................................................64

3.3.3 Are TX-IQ signals ok? ........................................................................................................64

3.3.4 Is TX VCO signal level in the T7503 output high enough?...................................................64

3.3.5 VCTCXO frequency and output level correct?......................................................................65

3.4 GSM (GMSK) modulation spectrum ok? .....................................................................................66

3.4.1 Are components in GSM power control loop in place and working ok? ..............................67

3.4.2 Does GSM PA (N7502) get correct bias currents? Is the level of bias currents ok?................67

3.4.3 Are TX-IQ signals ok? ........................................................................................................68

3.4.4 Is TX VCO signal level in the T7503 output high enough?...................................................68

3.4.5 Replace Vinku (N7501) or GSM PA (N7502) or both ............................................................69

3.5 TX power vs. time ok?..............................................................................................................69

3.5.1 Is the TXC-signal coming to Vinku ASIC (N7501) OK? ..........................................................69

3.5.2 Does GSM PA (N7502) get correct bias currents? Is the level of bias currents ok?................70

3.5.3 Does GSM PA (N7502) get correct DET_SW_G -voltage from Vinku ASIC (N7501)? ................. 71

3.5.4 Are components in GSM power control loop in place and working ok? ..............................71

4. Does the phone register to the network and make a call (WCDMA)? ................................................72

4.1 WCDMA TX power and transmit frequency ok? .........................................................................72

4.1.1 Does the WCDMA TX transmit RF-power at all? ..................................................................72

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4.1.2 Does WCDMA TX transmit enough RF-power and power levels otherwise ok? ....................85

4.1.3 WCDMA transmitter frequency correct?.............................................................................94

4.2 Does the phone give realistic RSSI-values? ...............................................................................99

4.2.1 Is Hinku ASIC (N7500) receiving RF-power correctly from the WCDMA-antenna connector? 99

4.2.2 Hinku WCDMA LNA output ok? ........................................................................................100

4.2.3 WCDMA SAW Z7501 in place and working correctly?........................................................100

4.2.4 Are RX-IQ signal waveforms and levels correct? ..............................................................101

4.2.5 Does RAP3G ASIC get ok VREFCM-signal from Hinku (N7500)? Signal level ok? ..................109

4.2.6 RAP3G faulty?.................................................................................................................109

4.3 WCDMA modulation spectrum and ACLR ok?...........................................................................109

4.3.1 Does N7504 give correct voltage level (Vcc11) to the WCDMA PA (N7503)?.......................109

4.3.2 Does WCDMA PA (N7503) get correct bias currents Icont11 and Icont12? .........................111

4.3.3 Are TX-IQ signals ok? ......................................................................................................113

4.3.4 Is TX VCO signal level in the T7503 output high enough?.................................................113

4.3.5 Replace Vinku (N7501) or WCDMA PA (N7503) or both.....................................................114

5. Does the phone have a reliable connection to the network (GSM)?................................................115

5.1 GSM receiver Bit Error Rate (BER) ok?......................................................................................115

5.1.1 Does the phone give realistic RSSI-values?......................................................................115

5.1.2 Hinku (N7500) or RAP3G (D2800) faulty?.........................................................................115

5.2 GSM transmitter power levels and transmit frequency ok? .....................................................115

5.3 GSM Transmitter phase error ok? ...........................................................................................115

5.4 GSM (GMSK) modulation spectrum ok? ...................................................................................115

5.5 TX power vs. time ok?............................................................................................................115

6. Does the phone have a reliable connection to the network (WCDMA)? ..........................................115

6.1 WCDMA receiver Bit Error Rate (BER) ok? ................................................................................116

6.1.1 Does the phone give realistic RSSI-values?......................................................................116

6.1.2 Hinku (N7500) or RAP3G (D2800) faulty?.........................................................................116

6.2 WCDMA TX power and transmit frequency ok? .......................................................................116

6.3 WCDMA Transmitter error vector magnitude ok? ....................................................................116

6.3.1 Is capacitor C7579 in WCDMA PA (N7503) bias line in place? ............................................117

6.3.2 Are capacitors in Vinku REG1 and REG2 lines in place? .....................................................117

6.3.3 Are capacitors in WCDMA PA power supply lines in place? ...............................................117

6.3.4 Are TX-IQ signals ok? ......................................................................................................117

6.3.5 Is TX VCO signal level in the T7503 output high enough?.................................................117

6.3.6 VCTCXO frequency and output level correct?....................................................................118

6.4 WCDMA modulation spectrum and ACLR ok?...........................................................................118

6.5 Troubleshooting pictures ......................................................................................................119

6.5.1 VCTCXO Output (DC Offset 1.24 V) ....................................................................................119

6.5.2 TXC in GSM mode (DC Offset 0 V)......................................................................................119

6.5.3 TX VC in GSM mode (DC Offset 1.8 V) ................................................................................120

6.5.4 Icont_21/Icont_22 (DC Offset 1.2 V) .................................................................................120

6.5.5 Icont_31/Icont_32 (DC Offset 1.2 V) .................................................................................121

6.5.6 GSM RX IQ (DC Offset 0.4 V)..............................................................................................122

6.5.7 RX VC in GSM mode (DC Offset 1.5 V) ................................................................................123

6.5.8 TX Modulation spectrum (GSM) .......................................................................................124

6.5.9 RFBUS ............................................................................................................................125

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Appendix A: RF Troubleshooting

1. USING THESE INSTRUCTIONS

The following sections include lots of headings and subheadings that are asking simple positive style questions.

For example heading 4.2 asks if the phone does measure RSSI-values correctly in GSM-bands. If the answer is “Yes” then user should go to the next heading on the same level (heading number that has as many decimal numbers as the heading 4.2) In our example case moving to the section 4.3. If the answer is “No” then user should go to one heading level deeper in hierarchical system meaning the section 4.2.1 in our example case.

Figure 1 Use of this troubleshooting manual presented with an example. Notice that real section numbers are not used.

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2. RF SELF TESTS

The RF part of the device is equipped with self test functionality which tests most of RF-BB interface signals and some parts of RF circuitry. Self tests are designed to detect faults on some critical parts, but they can not prove that everything is OK even if all the self tests are passed.

Self-tests can be run with Phoenix service software. Tests can return pass/fail result and detailed measurement data and error codes in fail case. Select “Testing” -> “Self Tests” from the Phoenix menu. Select appropriate RF self tests and run them with “Start”-button. Notice that self tests should be run in “Local”-mode (change “Operating Mode” to “Local” in Phoenix before running self tests). For service tool usage instructions refer to the “Service Software” and “Service Tools and Service Concepts” sections.

Nokia Customer Care

NOTICE! Perform WCDMA transmitter self test (

ST_CDSP_WCDMA_TX_POWER_TEST) always in an RF

shielded environment (for example in an RF-shield box).

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If one or more self tests show fail results (for example: “minor” or “fatal”) more detailed error codes can be read from the phone with “Details” button. Error codes are shown in hexadecimal format, but notice that all returned hexadecimal values are not necessarily useful in RF troubleshooting because some of the self tests return also different kind of measurement information together with “real” error codes. If self tests are not passed, please refer to following subchapters for detailed troubleshooting information.

IMPORTANT!

In order to use these self-tests most efficiently, it is very important that the tests are performed in certain order (or at least the error data is analyzed in this order). The tests are designed so that by performing them in this order it is easy to find the problematic component without any redundant checks. The following flowchart is based on that idea (i.e. if RFBUS fails, there is no need to spend time wondering why there is no power at TX).

RF SELFTEST FAILS

YES

(86) ST_CDSP_RF_BB_IF_TEST FAILS

YES

ST_CDSP_RF_BB_IF_TEST

Go to

Appendix A: RF Troubleshooting

NO NO

It’s not possible to get here…

NO

(83) ST_CDSP_RF_SUPPLY_IF_TEST

FAILS FOR VINKU

YES

Go to ST_CDSP_RF_SUPPLY_TEST

VINKU ERRORS

NO

(83) ST_CDSP_RF_SUPPLY_IF_TEST FAILS

FOR HINKU

YES

Go to ST_CDSP_RF_SUPPLY_TEST

HINKU ERRORS

NO

(85) ST_CDSP_TXIQ_TEST FAILS

YES

Go to ST_CDSP_TXIQ_TEST

ERRORS

(79) ST_CDSP_RX_PLL_LOCK_TEST

FAILS

YES

S _CDSP_RX_PLL_LOCK_TEST

Go to

T

ERRORS

(81) ST_CDSP_RX_IQ_LOOP_BACK_TEST

FAILS

YES

Go o ST_CDSP_RX_IQ LOOP_BACK

t

ERRORS

NO

(74) ST_CDSP_TXC_DATA_TEST FAILS

YES

Go to

ST DSP_TXC_DATA_TEST

_C

ERRORS

(80) ST_CDSP_TX_PLL_LOCK_TEST FAILS

YES

ST_CDSP_TX_PLL_LOCK_TEST

Go to

ERRORS

(77) ST_CDSP_GSM_POWER_TEST

FAILS

YES

ST_CDSP_GSM_POWER_TEST

Go to

ERRORS

NO

(82) ST_CDSP_POWER_DETECTOR

_BIAS_TEST FAILS

YES

Go to

ST DSP_POWER_DETECTOR_

_C

BIAS_TEST ERRORS

NO

(75) ST_CDSP_WCDMA_TX POWER_TEST

FAILS

YES

ST DSP_WCDMA_TX_POWER_

NO

Go to

_C

TEST ERRORS

It’s not possible to get here…

NO

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:

s

:

(

)

Appendix A: RF Troubleshooting

2.1 RF-BB interface (ST_CDSP_RF_BB_IF_TEST)

RF_BB_IF test (86) tests the functionality of the RAP3G/HINKU/VINKU serial interface & reset lines. If this test fails, it means that there’s a problem programming Hinku and or Vinku and all of the following tests cannot give correct data.

Tested signals: VBAT_ASIC, VDIG, VREFRF01, VXO, RFBUSDAT, RFBUSCLK, RFBUSENA, RXRESETX, TXRESETX

Error code for this self test is given in format:

• 0xyy, 0xzz

,where 0xyy, 0xzz part is the total error code: 0xyyzz

ST_CDSP_RF_BB_IF_TEST

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Incorrect version number

read from the RX_IC

(0x0001)

0x0001

YES

YES YES

Incorrect version number

Incorrect version

read from the TX_IC

number read from the

(0x0008)

TX_IC (0x0008)

YES

YES YES

VXO (VDIG) voltage OK?

O (VDIG) voltage OK?

VX

YES

YES YES

Propable cause:

Solder problem/faulty RAP

Other possible reasons

- Solder problem/faulty

Other possible reasons:

Hinku AND Vinku

-Solder problem/faulty

- Problem with RXRESETX

Hinku AND Vinku

AND TXRESETX

-Problem with RXRESETX and TXRESETX

Propable cause:

Solder problem/faulty

NO

NO NO

Other possible reasons:

-Problem in VDIG between RETU & HINKU

-Problem with RXRESETX

NO

NO NO

Propable cause:

Problem in RETU or in

VDIG between route

RETU & HINKU & VINKU

NO

HINKU

Continue to

NO

RX_IC is not reset correctly

RX_IC is not reset

(0x0002)

correctly (0x0002)

YES

YESYES

TX_IC is not reset correctly

(0x0010)

YES

YESYES

NO

VXO (VDIG) voltage OK?

Solder problem/faulty RAP

Other possible reasons

Other possible reasons:

Solder problem/faulty

-Solder problem/faulty

YES

YESYES

Propable cause:

Hinku AND Vinku

NO

NONO

Is RXRESETX signal OK?

YES

YESYES

Propable cause:

Solder problem/faulty

HINKU

Other possible reasons

Other possible reason

Other possible reasons:

Problem in VDIG between

RETU & HINKU

Continue to

_CDSP_RF_BB_IF_TEST

ST

_CDSP_RF_BB_IF_TEST

ST

T_CDSP_RF_BB_IF_TESTS

LURE PAGE_2

FAI

LURE PAGE_2

FAI

Solder problem/faulty RAP

Other possible reasons

Other possible reasons:

Short circuit under HINKU/

FAILURE PAGE 2

Propable cause:

-Short circuit under Faulty HINKU

Faulty HINKU

HINKU/Faulty HINKU

NO

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(

)

(

)

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ST_CDSP_RF_BB_IF_TEST FAILURE PAGE_2

Appendix A: RF Troubleshooting

Incorrect version

number read from the

TX_IC

0x0008)

YES

YES YES

Propable cause:

Poor solder/Faulty VINKU

Poor solder/faulty Vinku

Other possible reasons

Other possible reasons:

VDIG connection between

RETU & VINKU

NO

Please, refer to chapter interpretation is needed.

Register write - read cycle

Register write-read cycle

(RX)

failed

failed (RX)

(0x0004)

0x0004

Propable cause:

Faulty HINKU

NO

TX_IC is not reset correctly

(0x0010)

Is TXRESETX signal OK?

Is XRESETX signal OK?T

Register write - read cycle

Register write-read cycle

NO

NONO

failed (TX) (0x0012)

YES

YESYES

NO

YES

YESYES

failed (TX)

0x0012

YES

Propable cause: Propable cause:

Faulty VINKU

NO

Propable cause:

Propablecause:

Faulty VINKU

Propable cause:

Propablecause:

Solder problem/faulty RAP

Other possible reasons

Other possible reasons:

Short circuit under VINKU/

Short circuit under

Faulty VINKU

VINKU/Faulty VINKU

It’s not possibleto

It’s not possible to

get here…

Error Code Interpretation Examples if more information about error code

A-8

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Appendix A: RF Troubleshooting

2.2 Supply test for Hinku and Vinku (ST_CDSP_RF_SUPPLY_TEST)

This self test includes two different RF-supply self tests…one for Vinku and one for Hinku:

RF_SUPPLY_TEST (VINKU) (83) tests the functionality of Vinku’s bias block, regulators, reference voltage line and, supply connections. If these fail, all other Vinku tests can/will fail. Also many Hinku tests can be affected and can’t be trusted.

RF_SUPPLY_TEST (HINKU) (83) tests the functionality of Hinku’s bias block, regulators, reference voltage line and, supply connections. If these fail, all other Hinku tests can/will fail and can’t be trusted.

Error code for this self test is given in format:

• 0xyy, 0xyy, 0xzz, 0xzz, MeasResult1, MeasResult2, …

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,where 0xyy, 0xyy part is the main part of the error code for Vinku TX ASIC: 0xyyyy

and 0xzz, 0xzz is the main part of the error code for Hinku TX ASIC: 0xzzzz

ST_CDSP_RF_SUPPLY_TEST

ST_CDSP_RF_SUPPLY_T

VINKU

ALL ERRORS

simultaneously (0x0FFF)

Does also Hinku’s ALL

supply tests fail?

(0x0FFF)

Propable cause:

Poor soldering/faulty RETU

Poor soldering/faulty VINKU

Go

NO

ST_CDSP_RF_SUPPLY

T ST VINKU ERRORSE

PAGE 2

YES

Propable cause:

NO

YES

Poor soldering/faulty VINKU

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VB_EXT line fail

Does also Hinku’s VB_EXT

line fail (0x0001)

Propable cause:

Poor soldering/faulty RETU

Other possible reasons:

Other possible reasons

-Problem in VB_EXT connection

- Problem in VB_ext connection between RF & BB

between RF & BB

- Poor soldering/faulty

- Poor soldering/ faulty HINKU an d

HINKU AND VINKU

(0x0001)

YES

VINKU

YES

Appendix A: RF Troubleshooting

ST_CDSP_RF_SUPPLY_TEST,

VINKU ERRORS, PAGE2

NO

VXO supply fail

Propable cause:

Faulty Vinku /Test error

Faulty Vinku/Test error

(BB/IF tests have bee n

(BB/IF tests have b een passed so

passed so VDIG has to be OK!

VDIG has to be OK! So the

So the problem is in the testmux )

problem is in the test mux)

Poor solder/fau lty VINKU

Poor solder/Faulty VINKU

(0x0002)

YES

Propable ca use:

Propable cause:

NO

VBAT1 (VBAT_ASIC) OK?

VR1 (VREG1) OK? VR2 (VREG2) OK?

VBAT1 OR VR1

(0x0004)

YES

Propable cause:

Test error

NO

VBAT2 OR VR2

(0x0008)

YES

VBAT2 (VBAT_ASIC) OK?

YES

Propable cause:

Test error

Go to

NO

ST_CDSP_RF_SUPP

ST_CDSP_RF_SUPPLY

TEST VINKU ERRORS

LY

PAGE 3

_TEST VINKU ERRORS PAGE 3

NO

Propable cause:

Poor solder/Fa ulty VINKU

Poor soldering/faulty RETU

Other possible reasons

Other possible reasons:

Faulty capacito r connected

to VR1

Propable cause:

Poor solder/faulty VINKU

Poor solder/Fault y VINKU

Other possible reasons:

Other possible reasons

Faulty capacitor connected

to VR2

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Appendix A: RF Troubleshooting

VRFTX fail

VRFTX Fail (0x0010)

Faulty capacitor at VRXTX pin

(0x0010)

YES

Propable cause:

Poor solder

Other possible reasons:

Other possible reasons

Faulty capacitor at VRXTX pin

NO

VVGA Fail (0x0020)

Propable cause:

Other possible reasons:

Other possible reasons

Faulty capacitor at VVGA pin

VVGA fail (0x0020)

YES

Poor solder

ST_CDSP_RF_SUPPLY_TEST,

ST_CDSP_RF_SUPPLY_TES

VINKU ERRORS, PAGE 3

VINKU ERRORS, PAGE

NO

VVCO Fail (0x0040)

Propable cause:

Other possible reasons:

Other possible reasons

Faulty capacitor at VVCO pin

VVCO fail (0x0040)

YES

Poor solder

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NO

VLO Fail (0x0080)

Other possible reasons

Faulty capacitor at VLO pin

VLO fail

Propable cause:

Poor solder

Other possible reasons:

Faulty capacitor at VLO pin

(0x0080)

YES

Poor solder

NO

VPRE Fail

VPRE fail

(0x0100)

Propable cause:

Poor solder

Other possible reasons: Other possible reasons

Faulty capacitor at VPRE pin Faulty capacitor at VPRE pin

(0x0100)

YES

RBE_EXT or internal

RB_EXT or internal

NO

Wrong or missing resistor at

bias block

bias block (0x0200)

(0x0200)

YES

Propable cause:

Poor solder/Faulty VINKU

Poor solder/Faulty Vinku

Other possible reasons:

Other possible reasons

Wrong or missing resistor at

RB_ext pin

NO

Temperature sensor

(0x0800)

Propable cause:

Faulty VINKU Faulty Vinku

Other possible reasons:

Other possible reasons

Too hot or cold

environment…

(0x0800)

YES

NO

It’s not possible to

It’s not possible to get

get here …

here…

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:

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ST_CDSP_RF_SUPPLY_TEST

ST_CDSP_RF_SUPPLY_TES

HINKU ERRORS

Appendix A: RF Troubleshooting

VB_EXT Fail

VB_EXT fail (0x0001)

Faulty capacitor at VDDLNA1 pin

(0x0001)

YES

Propable cause:

Poor soldering in HINKU

Poor soldering in

VDDLNA1 Fail (0x0010)

Propable cause:

Poor solder in

Poor solder in HINKU

Other possible reasons

Other possible reasons:

RB_EXT or internal

RB_EXT or internal block

bias bloc (0x0100)

Propable cause:

Poor solder/Faulty Hinku

Poor solder/Faulty HINKU

Other possible reasons

Other possible reasons:

Wrong or missing resistor at

Hinku

VDDLNA1 Fail

(0x0010)

YES

Hinku

(0x0100)

YES

RB_ext pin

NO

VDIG Fail

VDIG Fail (0x0002)

Propable cause:

Propablecause:

Poor soldering in HINKU

Poor soldering inHinku

VDDLNA2 Fail (0x0020)

Poor solder inHinku

Other possible reasons

Other possible reasons:

Faulty capacitor at VDDLNA2 pin

NO

Temperature sensor (0x0800)

Other possible reasons

Too hot or cold environment…

(0x0002)

YES

VDDLNA2 Fail

(0x0020)

YES

Propablecause:

Propable cause:

Poor solder in HINKU

Temperature sensor

(0x0800)

Propablecause:

Propable cause:

Faulty Hinku

Faulty HINKU

Other possible reasons:

VBAT1 or VR1 Fail

NO

VBAT1or VR1 Fail (0x0004)

Propablecause:

Propable cause:

Poor solder/FaultyHinku

Poor solder/Faulty HINKU

Other possible reasons

Other possible reasons:

Faulty capacitor at VR1

NO

VLO Fail (0x0040)

Poor Solder in Hinku

Other possible reasons

Other possible reasons:

Faulty capacitor at VDDLNA2 pin

Faulty capacitor at VDDLNA1 pin

NO

YES

(0x0004)

YES

VLO Fail

(0x0040)

YES

Propable cause:

Propablecause:

Poor solder in HINKU

It’s not possible to get

here…

NO

VMIX Fail (0x0008)

YES

VPRE Fail

(0x0080)

YES

Hinku

Propable cause:

Poor solder in Hinku

Poor solder in HINKU

Other possible reasons

Other possible reasons:

Faulty capacitor at VMIX pin

VPRE Fail (0x0080)

Propable cause:

Poor Solder in

Poor solder in HINKU

Other possible reasons

Other possible reasons:

Faulty capacitor at VLO pin

NO

Please, refer to chapter

Error Code Interpretation Examples if more information about error code

interpretation is needed.

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Appendix A: RF Troubleshooting

2.3 TX IQ self test (ST_CDSP_TX_IQ_TEST)

TX_IQ_TEST (85) checks that the TXIQ lines between RAP & Vinku are properly connected. If this fails also power tests and RXIQ loopback will fail.

Tested signals: VBAT_ASIC, TXIP, TXIQ, TXQP, TXQN, DAC_REF1, RFBUS

Error code for this self test is given in format:

• 0xyy, 0xzz, MeasResult1, MeasResult2, …

,where 0xyy, 0xzz is the main part of the error code: 0xyyzz

Nokia Customer Care

ST_CDSP_TX_IQ_TEST

ERRORS

ALL or ANY ERROR (0x00xx)

YES

Propable cause:

Poor soldering/faulty

VINKU

Poor soldering/faulty RAP

Other possible reasons:

RETU, but since we’ve

gotten this far

without fails it should be

OK

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2.4 TXC Data test (ST_TXC_DATA_TEST)

TXC_DATA_TEST (74) tests that the TXC line between RETU & VINKU is properly connected. If this fails also TX power tests will fail.

Test covers: TxC power control signal, Retu (N2200), RFBUS, Vinku (N7501), VBAT_ASIC

Error code for this self test is given in format:

• 0xyy, 0xzz, MeasResult1, MeasResult2, …

,where 0xyy, 0xzz part is the main part of the error code: 0xyyzz

ST_CDSP_TXC_DATA_TEST ERRORS

Appendix A: RF Troubleshooting

TXC too high at min

input (0x0001)

Propable cause:

Faulty RETU

Other possible reasons:

Vinku, but it only routes the

voltage back to RETU so in this

test, so it’s very unlikely.

YES

NO

TXC too low at max

input (0x0002)

Propable cause:

Poor soldering/Faulty VINKU

Poor soldering/Faulty RETU

YES

NO

It’s not possible to get here…

A-14

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Appendix A: RF Troubleshooting

2.5 WCDMA power detector biasing self test (ST_CDSP_PWR_DETECTOR_BIAS_TEST)

POWER_DETECTOR_BIAS_TEST (82) tests the biasing of the power detector. If this fails, also the power tests will fail/can’t be trusted.

Test covers: Vinku (N7501) WCDMA power detector biasing circuit functionality, Retu (N2200) WTXDET input. RFBUS, VBAT_ASIC

Error code for this self test is given in format:

• 0xyy, 0xzz, MeasResult1, MeasResult2

,where 0xyy, 0xzz part is the main part of the error code: 0xyyzz

Nokia Customer Care

ST_CDSP_WCDMA_POWER_DET

EC TOR_BIAS_TEST ERRORS

Test error (0x0001,

0x0002, 0x0008,

0x0010

YES

Propable cause:

?

Other possible reasons:

RFBUS, but shouldn’t be

since we’ve gotten this

far.

Please, refer to chapter interpretation is needed.

Error Code Interpretation Examples if more information about error code

NO

Detector reading outside

limits (0x0004)

YES

Propable cause:

Problem in detector circuitry see “WCDMA power detector

ok?” for debugging details.

Other possible reasons:

Poor solder/faulty Retu

NO

It’s not possible to get here…

2.5.1 WCDMA power detector ok?

Follow these instructions if it’s needed to check WCDMA power detector functionality. Please notice that WCDMA power detector is used only in maximum TX power limiting and WCDMA PA supply voltage controlling purposes.

• WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “Transmitter troubleshooting”.

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• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to R7531.

• WTXDET signal should be constant DC-voltage. Voltage level should change if TX power is changed.

Vcontrol is lower on lower power levels and higher if higher power levels are used.

• WTXDET should be about 325 mV with power level +10 dBm, about 1.03 V with power level +21 dBm and about 150 mV when power levels below 0 dBm are used.

• NOTICE: Perform WCDMA transmitter tests with > 0 dBm power only in RF shielded environment.

Appendix A: RF Troubleshooting

• If WTXDET –signal is not as expected follow the same troubleshooting instructions as in:

SMPS get correct control voltage from the WCDMA power detector (signal Vcontrol)?

Does

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Appendix A: RF Troubleshooting

2.6 RX PLL phase lock self test (ST_CDSP_RX_PLL_PHASE_LOCK_TEST)

RX_PLL_LOCK_TEST (79) tests the functionality of RX PLL. If this fails, none of the RX related measurements cannot be trusted.

Tested signals: VBAT_ASIC, VDIG, VR1, VR1RX, VCP1, RFBUSDAT, RFBUSCLK, RFBUSENA, RXRESETX

Error code for this self test is given in format:

• 0xyy, 0xzz

,where 0xyy, 0xzz part is the total error code: 0xyyzz

Nokia Customer Care

Is t ere RF power at

h

Is there RF power at VCO

VCO output?

output?

YES

Is RF power at Hinku

there

there RF power at

Is

in ut?

p

Hinku input?

YES

there ENOUGH RF

Is

Is ere ENOUGH RF power

th

power at Hinku input?

at Hinku input?

I he RX VCO frequency

s t

Is t e Frequency correct ?

h

YES

correct?

YES

Hinku PLL not locked

(0x0004)

YES

NO

there supply voltage for VCO?

Is

If VR1RX is OK then the problem is

VCO, otherwise Hinku is faulty. (VR1

is routed through Hinku to VCO)

NO

Propable cause:

Poor solder/Faulty balun

NO

correct freq and not locked then

Propable cause:

Balun or VCO

Propable cause:

Correct frequency and Hinku

says it’s not locked then

change Hinku

ST_CDSP_RX_PLL_PHASE_LOCK_TE

NO

YES

Hinku says it’s change Hinku

Propable cause:

Poor solder/Faulty VCO

ERRORS

ST

Any other code It’s not possible to get

Any other code

YES

NO

Is CP1 voltage ok?

the V

Is the VCP voltage ok?

NO

It’s not possible to

get here …

here…

Propable cause: Propable cause:

Test problem Test problem

RFBUS failure (but this

RFBUS failure (but this should

should be ok if we’ve

be ok if we’ve gotten this far)

otten this far)

Propable cause:

Poor solder/ Faulty Hinku

Poor solder/Faulty Hinku

Other possible reasons

Other possible reasons:

VCP line shorted to ground

YES

Poor solder/Faulty RETU Poor solder/Faulty RETU

NO

Go through this and this link

c

not working change VCO

c ntrol voltage VC ok?” link

o

Hinku, if still not working

Hinku , if still

Propable cause:

Go through “Are

if no help then

omponents near the RX

change

VCO ok?” and “RX VCO

f no help then change

i

change VCO.

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Nokia Customer Care

2.7 TX PLL phase lock self test (ST_CDSP_TX_PLL_PHASE_LOCK_TEST)

TX_PLL_LOCK_TEST (80) tests the functionality of RX PLL. If this fails also the TX power tests will fail.

Tested signals: VBAT_ASIC, VDIG, VR1, VCP2, RFBUSDAT, RFBUSCLK, RFBUSENA, TXRESETX

Error code for this self test is given in format:

• 0xyy, 0xzz

,where 0xyy, 0xzz part is the total error code: 0xyyzz

Appendix A: RF Troubleshooting

I there RF power at

s

Is there RF power at VCO

VCO output?

output?

YES

I there RF power at

s

Is ere RF power at Vinku

th

Vinku input?

input?

YES

Is there ENOUGH RF

Is there ENOUGH RF power

power at Vinku input?

at

Vinku input?

he TX VCO frequency

Is t

Is the Frequency correct ?

YES

correct?

YES

Vinku PLL not locked

(0x0004)

YES

NO

there supply

Is

Is there supply

voltage for VCO?

voltage

(VINKU VREG2)

NO

Propable cause:

Poor solder/Faulty balun

NO

correct freq and

Correct frequency and Hinku

Propable cause:

Balun

Balun or VCO

Propable cause:

not locked

then change Hinku

says it’s not locked then

change Hinku

ST_CDSP_TX_PLL_PHASE_LOCK_TE

ST_CDSP_TX_PLL_PHASE_LOCK ST

NO

for VCO?

YES

Poor solder/Faulty VCO

ERROR

Any other code

YES

Propable cause:

Poor solder/Faulty Vinku

Propable cause:

Other possible reasons:

Poor solder/ Faulty Vinku

(This should have already

failed in earlier tests)

Propable cause:

NO

or VCO

Hinku says it’s

Is the VCP2 voltage ok?

Is the VCP voltage ok?

It’s not possible to get

NO

It’s not possible to

here…

get here …

Propable cause:

Test problem

RFBUS failure (but this

should be ok if we’ve

otten this far)

round

TX VCO

VCO.

Propable cause:

Poor solder/Faulty RETU

Other possible reasons

Other possible reasons:

VCP line shorted to ground

VCP line shorted to

NO

Propable cause:

Check the loop components/

Check the loop

YES

solder joints, if no help, change

components/solder joints, if

Vinku

. If still not working, change

no help, change Vinku. If

still not working, change TX

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Appendix A: RF Troubleshooting

2.8 WCDMA transmitter self test (ST_CDSP_WCDMA_TX_POWER_TEST)

TX_WCDMA_POWER_TEST (75) checks the output power of the WCDMA transmitter.

Test covers: Modulator, Vinku (N7501) IC gain stages, IC output supply components, TX filter, WCDMA PA (N7503), DCDC-converter (N7504), RFBUS, VBAT_ASIC, VBAT_PA

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Test does not cover: Circulator (Z7505), duplexer (Z7502), and antenna

To prevent network interference, the phone must be in an RF shield box, when this test is run!

Error code for this self test is given in format:

• 0xyy, 0xzz, MeasResult1, MeasResult2

,where 0xyy, 0xzz part is the main part of the error code: 0xyyzz

ST_CDSP_WCDMA_TX_POWER_TEST

Too low output power

(0x0010)

YES

NO

Any other code

YES

It’s not possible to

NO

It’s not possibleto

get here…

get here

…

ny power at Vinku

A

Any power at Vinku output

output at all?

at all ?

YES

Propable cause:

Plenty of components

Plenty of components involved. Go

involved. Go through the whole

thro

ugh the whole “WCDMA TX

“WCDMA TX power and transmit

o

p wer and transmit frequency

Frequency ok?”

to find reason.

ok?” to find reason.

NO

Propable cause:

Propablecause:

Poor solder/Faulty Vinku

Poor solder/FaultyVinku

Propablecause:

Propable cause:

Test problem

RFBUS failure (but this should

RFBUS failure (but this

be ok if we’ve gotten this far)

should be ok if we’ve

otten this far

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2.9 RX IQ loop back self test (ST_CDSP_RX_IQ_LOOP_BACK_TEST)

RX_IQ_LOOPBACK (81) tests that the RXI lines & VREFCM line between RAP & HINKU are connected.

Tested signals: VBAT_ASIC, RXQP, RXQN, RXIP, RXIN, VREFCM, TXIP, TXIN, RFBUS

Error code for this self test is given in format:

• 0xyy, 0xzz, MeasResult1, MeasResult2

,where 0xyy, 0xzz part is the main part of the error code: 0xyyzz

ST_CDSP_RX_IQ_LOOP_BACK_TEST

Appendix A: RF Troubleshooting

A IQ signals OK?

re RX

Are RXIQ signals OK?

VREFCM OK?

Propable cause:

Poor solder/Faulty RAP

Measured IQ power

under limit

(0x0010)

NO

YES

NO

YES

NO

under limit

(0x0010)

YES

Propable cause: Propable cause:

Poor solder/Faulty Hinku

Other possible reasons: Other possible reasons

Vinku, but it should have

failed already in earlier

Retu/VB_ext line, but these should

tests

Propable cause: Propable cause:

Poor solder/Faulty Hinku Poor solder/Faulty Hinku

Other possible reasons:

Other possible reasons

Retu/VB_ext line, but these

should have failed already in

have failed already

earlier tests.

in earlier tests

NO

Any other code

YES

Propable cause:

Test problem

RFBUS failure (but this

RFBUS failure (but this should

should be ok if we’ve

be ok if we’ve gotten this

gotten this far)

NO

Test problem

It’s not possible to get

It’s not possible to

get here

here…

…

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Appendix A: RF Troubleshooting

2.10 GSM transmitter self test (ST_CDSP_GSM_TX_POWER_TEST)

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TX_GSM_POWER_TEST (77) checks the output power of the GSM transmitter.

Test covers: RFIC Vinku (N7501), modulator, IC gain control stages, filter/balun solder joints, GSM PA (N7502), PA bias lines & DACs, RFBUS, TX power detector functionality, VBAT_ASIC, VBAT_PA.

Test does not cover: Antenna functionality, RX/TX-switch functionality, and TX signal quality

Error code for this self test is given in format:

• 0xyy, 0xzz, MeasResult1, MeasResult2, …

,where 0xyy, 0xzz part is the main part of the error code: 0xyyzz

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2.11 Error Code Interpretation Examples

This section presents three different examples of RF error code interpretation.

2.11.1 Example 1

ST_CDSP_RX_PLL_PHASE_LOCK self test gives “Fatal” result with error code: 0x00, 0x04

This means that the total error code is “0x004” (“0000 0000 0000 0100” in binary format) and if we look a flowchart in section for the code is “Hinku PLL is not locked”.

2.11.2 Example 2

Some of the self-tests can return multiple errors at the same time.

For example: RF-BB interface (ST_CDSP_RF_BB_IF_TEST) self test gives “Fatal” result with

error code: 0x00, 0x09, …

Appendix A: RF Troubleshooting

RX PLL phase lock self test (ST_CDSP_RX_PLL_PHASE_LOCK_TEST) the meaning

This means that the total error code without measurement values is “0x0009” and this is the same as “0000 0000 0000 1001” in binary format. If we look closer there are multiple errors (2) found:

Bit mask “---- ---- ---- ---1” = “0x0001”

Bit mask “---- ---- ---- 1---“ = “0x0008”

Troubleshooting can be continued with there are errors with two error codes: 0x0001 and 0x0008.

2.11.3 Example 3

Supply test for Hinku and Vinku (ST_CDSP_RF_SUPPLY_TEST) is slightly different self test from others because there are both Vinku and Hinku errors shown in the same error code (

explained in section

For example: ST_CDSP_RF_SUPPLY_TEST gives “Fatal” result with error code: 0x0B, 0xBC, 0x00, 0x00, …

This error code means that there are probably no errors in Hinku RX ASIC supply voltages because the main part of the error code for Hinku is 0x00, 0x00 (=0x0000) and means the same as “no errors”.

Anyway, there are many errors with Vinku TX ASIC supply voltages. The main part of the error code for Vinku is 0x0B, 0xBC and that’s the same as “101110111100” in binary format. If we look closer there are multiple (8) errors found:

RF-BB interface (ST_CDSP_RF_BB_IF_TEST) flowchart because

The format for error code is

Supply test for Hinku and Vinku).

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Bit mask “---- ---- ---- -1--“ = “0x0004”

Bit mask “---- ---- ---- 1---“ = “0x0008”

Bit mask “---- ---- ---1 ----“ = “0x0010”

Bit mask “---- ---- --1- ----“ = “0x0020”

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Bit mask “---- ---- 1--- ----“ = ”0x0080”

Bit mask “---- ---1 ---- ----“ = “0x0100”

Bit mask “---- --1- ---- ----“ = ”0x0200”

Bit mask “---- 1--- ---- ----“ = ”0x0800”

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Troubleshooting can be continued with

ST_CDSP_RF_SUPPLY_TEST VINKU flowchart because there are

errors with eight VINKU error codes.

Typically this kind of error occurs if there is no VBAT_ASIC voltage coming to the Vinku TX ASIC at all or the ASIC is poorly soldered to the PWB (All voltages that are somehow related to VBAT_ASIC are causing errors).

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3. DOES THE PHONE REGISTER TO THE NETWORK AND MAKE A CALL (GSM)?

• Test against a GSM communication tester or real GSM network with a proper SIM.

3.1 GSM transmitter power levels and transmit frequency ok?

• Attach the phone to the product specific test jig and a spectrum analyser to the RF-coupler. Coupler attenuation should be also taken into account during measurements.

• Set GSM Tx ON. Procedure is explained in section “Transmitter troubleshooting”.

• Spectrum analyser centre frequency should be set according the used TX channel (See section

“Frequency mappings”).

• Spectrum analyser RBW = VBW = 1 MHz, Span 0 MHz, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

Appendix A: RF Troubleshooting

• Test at least the maximum and minimum power levels:

- EGSM900: The maximum power level is “5” (31 – 34 dBm, typ. value +33 dBm)

The minimum power level is “19” (3 – 7 dBm, typ. value +5 dBm)

- GSM1800: The maximum power level is “0” (28 – 32 dBm, typ. value +30 dBm)

The minimum power level is “15” (-2 - +2 dBm, typ. value +0 dBm)

- GSM1900: The maximum power level is “0” (28 – 32 dBm, typ. value +30 dBm)

The minimum power level is “15” (-2 - +2 dBm, typ. value +0 dBm)

• If power is not as expected separate the phone into parts and place to the module jig. Connect the spectrum analyser to the module jig GSM RF connector and measure power levels again (Notice

that there are three antenna connectors in the module jig, one for GSM, one for WCDMA and one for Bluetooth. Make sure that all connections are made to the correct RF-connector).

- Power levels ok in the module jig: Antenna or antenna connection bad. Replace the antenna

- Power levels still wrong or no TX signal found at all: Continue troubleshooting

• If TX signal is not found at all use wider span setting and check if the transmitter is transmitting on wrong frequency. If the signal is found to be on wrong frequency or frequency is not stabile, see section

3.1.3. "GSM transmitter frequency correct".

3.1.1 Does GSM TX transmit RF-power at all?

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• If TX signal is not found at all use wider span setting and check if the transmitter is transmitting on wrong frequency. If signal is found to be on wrong frequency or frequency is not stabile, see section,

3.1.3. "GSM transmitter frequency correct".

3.1.1.1 Is Vinku (N7501) transmitting RF-power at all?

• GSM transmitter has to be active before Vinku’s output level can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurements can be done with a spectrum analyser and an RF probe. RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”). Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• EGSM900:

- Connect the RF probe to Z7504 input. The level should be about the same on both input pins. Check output level with at least the maximum (5) and the minimum (19) power levels.

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- Maximum power level – Output level should be about -15…-25 dBm

- Minimum power level – Output level should be about -45…-55 dBm

• GSM1800/GSM1900:

- Connect the RF probe to C7577 or C7575. The level should be about the same on both capacitors. Check output level with at least the maximum (0) and the minimum (15) power levels.

- Maximum power level – Output level should be about -25…-35 dBm

- Minimum power level – Output level should be about -55…-65 dBm

• Check if output levels of Vinku are as expected.

• NOTE! If VINKU output RF-power is totally missing just in one or two GSM-bands, typically this

means that Vinku ASIC (N7501) is faulty or the ASIC is badly soldered. For example: VINKU is not transmitting at all in EGSM900-band but TX-power is ok in other GSM-bands. Then it’s quite clear that VINKU (N7501) is faulty or badly soldered and the component should be replaced.

3.1.1.1.1 RF operating voltage VBAT_ASIC?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7503 (or C7501, C7541)

• VBAT_ASIC voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V.

3.1.1.1.1.1 Ferrite inductor L7503 ok?

• Check that component is in place and solder joints are ok

• Measure voltage from the both ends of L7503. Is it faulty or is there short circuit in RF end?

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• Disconnect the power supply from the phone and use an ohmmeter to check that inductor is conducting DC.

3.1.1.1.2 RFBUS signals ok?

• GSM receiver has to be active before RFBUS signals can be measured. Procedure is explained in section “GSM RX chain activation for manual measurements”. Also WCDMA/GSM transmitter and WCDMA receiver activation can be used for the measurement but then RFBUS -signals don’t necessarily look like in figures mentioned below.

• Measurements can be performed with an oscilloscope and a probe. Check all five RF BUS signals:

- RFBUSDAT: Connect the probe to J7504. Typical RFBUSDAT -signal is shown in section 6.5.9.3

RFBUSDAT (GSM RX)”

“

- RFBUSCLK: Connect the probe to J7505. Typical RFBUSCLK -signal is shown in sections 6.5.9.1

RFUSCLK (GSM RX)” and 6.5.9.2 “RFBUSCLK and RFBUSENA (GSM RX)”

“

- RFBUSENA: Connect the probe to J7506. Typical RFBUSENA -signal is shown in section 6.5.9.2

RFBUSCLK and RFBUSENA (GSM RX)”

“

Appendix A: RF Troubleshooting

- RXRESETX: Connect the probe to J7515. RXRESETX -signal is a constant 2 V DC-signal after GSM or WCDMA transceiver has been activated the first time after phone boot up. The level of this signal should be about 0 V before transceiver activation.

- TXRESETX: Connect the probe to J7517. TXRESETX -signal is a constant 2 V DC-signal after GSM or WCDMA transceiver has been activated the first time after phone boot up. The level of this signal should be about 0 V before transceiver activation.

3.1.1.1.2.1 RAP3G (or Vinku or Hinku) faulty?

• RAP3G (D2800) cannot be replaced.

3.1.1.1.3 Vinku (N7501) regulator voltages VREG1, VREG2 ok?

• GSM transmitter has to be active before VREG1 and VREG2 voltages can be measured. Procedure is explained in section “Transmitter troubleshooting.”

• Measurements can be done with an oscilloscope and a probe.

• VREG1: Connect the probe to C7543

• VREG2: Connect the probe to C7548 (or C7547)

• VREG1 and VREG2 voltage levels should be 2.65 – 2.86 V. Typical value is 2.7 V.

3.1.1.1.3.1 Vinku (N7501) RB_EXT voltage ok?

• GSM transmitter has to be active before Vinku’s RB_EXT voltage can be measured. Procedure is explained in section “Transmitter troubleshooting”.

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• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to R7521.

• RB_EXT voltage should be 1.325 – 1.375 V.

3.1.1.1.3.1.1 VREFRF01-voltage ok?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to R7503.

• VREFRF01 voltage should be 1.325 – 1.375 V. Typical value is 1.35 V.

3.1.1.1.3.1.1.1 Desolder R7503. Is VREFRF01 voltage still wrong?

• Remember to solder a new component to R7503 pads after the measurement.

3.1.1.1.3.1.1.1.1 Capacitors C7518, C7520 and C7570 working correctly?

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• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that capacitors are

not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not help go to the next step.

3.1.1.1.3.1.1.1.2 Replace Vinku (N7501) or Hinku (N7500) or both

3.1.1.1.3.1.2 R7521 and R7504 in place and working correctly?

• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and check R7521 and R7504 resistance values with

an ohmmeter.

3.1.1.1.3.1.3 VB_EXT voltage ok?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7518.

• VB_EXT voltage should be 1.325 – 1.375 V. Typical value is 1.35 V.

3.1.1.1.3.1.3.1 Is R7503 in place and working correctly?

• Check that the component is in place and solder joints are ok

• Disconnect the power supply from the phone and check R7503 resistance value with an ohmmeter

3.1.1.1.3.1.3.2 Capacitors C7518, C7520 and C7570 working correctly?

• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that capacitors are

not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not

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Appendix A: RF Troubleshooting

help go to the next step.

3.1.1.1.3.1.3.3 Replace Vinku (N7501) or Hinku (N7500) or both

3.1.1.1.3.1.4 Replace Vinku (N7501)

3.1.1.1.3.2 Are capacitors in Vinku (N7501) regulator lines working correctly?

VREG1: C7543

VREG2: C7547, C7548, C7554, C7555, C7553, C7552, C7558 and C7567

• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that regulator lines

are not short-circuited to the ground. If short-circuit is found replace capacitors mentioned above. If this does not help go to the next step.

3.1.1.1.3.3 TX VCO (G7502) ok?

3.1.1.1.3.4 Replace Vinku (N7501)

3.1.1.1.4 VXO-voltage ok? (=Vdig).

• Measurement can be done with an oscilloscope and a probe

• Connect the probe to C7560 (or C7526, C7513) Notice: C7526 is a non-assembled component so the

probe should be connected to the pad that can still be found from the PWB.

• VXO-voltage should be about 2.5 V

3.1.1.1.4.1 C7560, C7513, C7526 and C2214 ok?

• Check that components are in place and solder joints are ok

• Notice: C7526 is a non-assembled component so the probe should be connected to the pad that

can still be found from the PWB.

• Disconnect the power supply from the phone and use an ohmmeter to find out if the VXO-line is short-circuited to the ground. If short-circuit is found replace C7560, C7513, C7526 and C2214. If replacing does not help then go to the next steps.

3.1.1.1.4.2 Replace Retu

3.1.1.1.4.3 Replace Hinku (N7500) or Vinku (N7501) or VCTCXO (G7501) or all three components

3.1.1.1.5 VCP2-voltage ok?

• GSM transmitter has to be active before VCP2 voltage can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurement can be done with an oscilloscope and a probe.

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• Connect the probe to C2221 (or C7550).

• VCP2 voltage should be about 4.75 V.

3.1.1.1.5.1 C7550 and C2221 working correctly?

• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to find out if the VCP2-line is

short-circuited to the ground. If short-circuit is found replace C7550 and C2221. If this does not help go to the next steps.

3.1.1.1.5.2 Retu ok?

3.1.1.1.5.3 Vinku (N7501) ok?

3.1.1.1.6 Is there RF power in the TX VCO output at all?

• GSM transmitter has to be active before TX VCO’s output frequency and output level can be measured. Procedure is explained in section “Transmitter troubleshooting”.

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• Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and VCO output power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• Connect the RF probe to the T7503 input. VCO shield has to be removed before measurement. Remember to solder the shield back after the phone repairing. Quick VCO alive check can be done

also without removing the RF shield. The RF probe should be placed as near the TX VCO output as possible (Put the head of the probe carefully inside the VCO can through the holes of the shield). Remember to use low RF Attenuator value in the spectrum analyser with this method.

• Check if the frequency of the TX VCO is as expected. If the VCO signal is not found try to use wider span setting. The correct VCO frequency can be found in section “Frequency mappings”. The output level of the VCO should be about -25 dBm during GSM TX burst.

3.1.1.1.6.1 TX VCO operating voltage VREG2 (VR2) ok?

• See section

"Vinku (N7501) regulator voltages VREG1, VREG2 ok?"

3.1.1.1.6.2 Replace TX VCO (G7502)

3.1.1.1.7 Is TX VCO RF-signal coming to the Vinku at all?

• GSM transmitter has to be active before TX VCO’s output level can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM

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transmission has pulsed nature and VCO output power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• Check the level of the TX VCO frequency in T7503 outputs. The level should be about -30…-35 dBm in both output lines. If the signal level is correct in the input (about -25 dBm) but output level is not as expected then replace T7503. VCO shield has to be removed before measurement. Remember to solder the shield back after the phone repairing.

3.1.1.1.7.1 Replace balun T7503

3.1.1.1.8 Are TX-IQ signals ok?

• These current mode signals are not possible to measure, but are tested with self-tests. So if there is no fail in 2.3. “

ST_CDSP_TX_IQ_TEST” these signals should be ok. Otherwise Vinku (N7501) or

RAP3G (D2800) is faulty. Notice that it is not possible to replace RAP3G ASIC.

3.1.1.1.9 Is there TXC-signal coming to Vinku ASIC (N7501)?

Appendix A: RF Troubleshooting

• GSM transmitter has to be active before TX control voltage TXC can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level first to the maximum (“5” in EGSM900 and “0” in GSM1800/GSM1900)

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7549

• Typical TX control voltage TXC timing should look somehow similar to figure

6.5.2 "TXC in GSM

mode (DC Offset 0 V)" (EGSM900 TX power level 5) and voltage levels should be roughly:

- EGSM900: 1.8 V while TX burst and 0 V otherwise.

- GSM1800/GSM1900: 1.8 V while TX burst and 0 V otherwise.

• Change the TX to the minimum power level (“19” in EGSM and “15” in GSM1800/GSM1900)

• Typical TX control voltage TXC levels should be now about:

- EGSM900: 1.0 V while TX burst and 0 V otherwise.

- GSM1800/GSM1900: 0.7 V while TX burst and 0 V otherwise.

3.1.1.1.9.1 R7514 in place?

• Check that the component is in place and solder joints are ok

• Disconnect the power supply from the phone and check R7514 resistance value with an ohmmeter

3.1.1.1.9.2 C7549 working correctly?

• Check that the component is in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that C7549is not

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short-circuited. If short-circuit is found replace the capacitor.

3.1.1.1.9.3 Retu ok?

3.1.1.1.10 VCTCXO frequency and output level correct?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7529 (or C7582)

• The frequency of the VCTCXO should be quite exactly 38.4 MHz and level about 0.5 - 0.9 Vpp.

Example of the correct VCTCXO output signal is presented in figure

1.24 V)"..

3.1.1.1.10.1 VXO-voltage ok? (=Vdig).

• Measurement can be done with an oscilloscope and a probe

• Connect the probe to C7560 (or C7526, C7513) Notice: C7526 is a non-assembled component so the

probe should be connected to the pad that can still be found from the PWB.

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6.5.1. "VCTCXO Output (DC Offset

• VXO-voltage should be about 2.5 V

3.1.1.1.10.1.1 C7560, C7513, C7526 and C2214 ok?

• Check that components are in place and solder joints are ok

• Notice: C7526 is a non-assembled component so the probe should be connected to the pad that

can still be found from the PWB.

• Disconnect the power supply from the phone and use an ohmmeter to find out if the VXO-line is short-circuited to the ground. If short-circuit is found replace C7560, C7513, C7526 and C2214. If replacing does not help then go to the next steps.

3.1.1.1.10.1.2 Replace Retu

3.1.1.1.10.1.3 Replace Hinku (N7500) or Vinku (N7501) or VCTCXO (G7501) or all three components

3.1.1.1.10.2 BB AFC-voltage ok?

• See section

"BB AFC-voltage ok?"

3.1.1.1.10.3 Replace VCTCXO G7501

3.1.1.1.11 Replace Vinku (N7501)

3.1.1.2 Is there RF-power in the GSM PA (N7502) input at all?

• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level to the maximum (“5” in EGSM900 and “0” in GSM1800/GSM1900)

• Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct

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Appendix A: RF Troubleshooting

frequency settings to the spectrum analyser. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• EGSM900: Connect the probe to J7521 (test point). The RF level should be roughly -15…-20 dBm.

• GSM1800 or GSM1900: Connect the probe to R7512 output. The RF level should be roughly -20…-

30 dBm.

3.1.1.2.1 EGSM900: Replace SAW Z7504

3.1.1.2.2 GSM1800/GSM1900: Is Vinku (N7501) output RF-signal coming to the T7502 (Balun)?

• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”. Set TX power level to the maximum (“0” in GSM1800/GSM1900)

• Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• GSM1800 or GSM1900: Connect the probe to T7502 input. There are two input ports in T7502 because the input port is balanced. The RF level should be roughly -25 dBm in both inputs.

3.1.1.2.2.1 Matching components ok?

GSM1800/GSM1900: C7575 and C7577

• Check that components are in place and solder joints are ok

• GSM1800 and GSM1900: Disconnect the power supply from the phone and use an ohmmeter to

check that capacitors C7575 and C7577 are not short-circuited. If short-circuit is found replace the faulty capacitor.

3.1.1.2.3 GSM1800/GSM1900: Is there RF power in the balun (T7502) output at all?

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• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”. Set TX power level to the maximum (“0” in GSM1800/GSM1900)

• Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct frequency settings to the spectrum analyser. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering

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Appendix A: RF Troubleshooting

needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• GSM1800 or GSM1900: Connect the probe to R7512 input. The RF level should be roughly -20…30 dBm.

3.1.1.2.3.1 Replace balun T7502

3.1.1.2.4 GSM1800/GSM1900: Replace attenuator R7512

3.1.1.3 Does GSM PA (N7502) transmit RF-power at all?

• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level to the minimum (“19” in EGSM900 and “15” in GSM1800/GSM1900)

• Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre

frequency should be set according the used TX channel (see section “Frequency mappings”).

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• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• EGSM900: Connect the probe to J7520 (test point). The RF level should be about -16…-17 dBm.

• GSM1800 or GSM1900: Connect the probe to J7519 (test point). The RF level should be roughly

-29…-30 dBm in both bands.

3.1.1.3.1 GSM PA (N7502) operating voltage ok?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7593

• Voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V

3.1.1.3.1.1 PA operating voltage VBAT_PA ok?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7569 (or C7564, C7583)

• Voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V.

3.1.1.3.1.1.1 Ferrite Z7500 ok?

• Check that component is in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that inductor is

conducting DC.

3.1.1.3.1.2 C7593 ok?

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• Check that the component is in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that the capacitor is

not short-circuited. If short-circuit is found replace the capacitor.

3.1.1.3.1.3 Replace inductor L7516

• If replacing does not help, replace GSM PA (N7502)

3.1.1.3.2 Are bias currents coming correctly to the GSM PA (N7502)?

EGSM: Icont_21 and Icont_22

GSM1800/GSM1900: Icont_31 and Icont_32

• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level to the maximum (“5” in EGSM900 and “0” in GSM1800/GSM1900)

Appendix A: RF Troubleshooting

• Measurements can be done with an oscilloscope and a VOLTAGE probe.

• EGSM900:

- Connect the probe to C7545 or C7544. Notice: C7544 is a non-assembled component so the probe should be connected to the pad that can be still found from the PWB.

- Typical full TX power bias currents (Icont_21 and Icont_22) should look somehow similar to figure

6.5.4 "lcont_21/lcont_22 (DC offset 1.2V)" when measured with an oscilloscope and a probe. Check

both currents.

• GSM1800 or GSM1900:

- Connect the probe to C7561 or C7556.

- Typical full TX power bias currents (Icont_31 and Icont_32) should look somehow similar to figure

6.5.5 when measured with an oscilloscope and a probe. Check both currents.

3.1.1.3.2.1 Vinku (N7501) RB_EXT voltage ok?

• See section

"Vinku (N7501) RB_EXT voltage ok?"

3.1.1.3.2.2 Are capacitors in GSM PA (N7502) bias lines working correctly?

EGSM: Icont_21 missing – Replace Vinku Icont_22 missing – C7545 short-circuited? GSM1800/GSM1900: Icont_31 missing – C7556 short-circuited? Icont_32 missing – C7561 short-circuited?

• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that capacitors are

not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not

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Appendix A: RF Troubleshooting

help go to the next step.

3.1.1.3.2.3 Replace Vinku (N7501)

3.1.1.3.3 Replace PA (N7502)

3.1.1.4 Are control voltages VC1, VC2 and VC3 coming correctly to the antenna switch (Z7503)?

• Use “RF Controls” window in Phoenix test software to activate the GSM transmitter and to select the wanted GSM band. Procedure is explained in section “Transmitter troubleshooting”. GSM RX activation is described in section “GSM RX chain activation for manual measurements”.

• Use an oscilloscope and probe to find out if antenna switch control lines are working according to table shown below. “Hi” means that there is 2.4 – 2.8 V control voltage level in the corresponding control line. “Lo” means levels 0 – 0.2 V. Remember to trigger the oscilloscope because control voltages VC1, VC2 and VC3 are pulsed

• Connect the probe to correct test points to measure VC1, VC2 and VC3 voltages (check test point locations from section “Test point locations”). Notice: these test points are PWB pads for three non-assembled capacitors.

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3.1.1.4.1 Replace Hinku (N7500)

3.1.1.5 Replace antenna Switch Z7503

3.1.2 Does GSM TX transmit enough RF-power and power levels otherwise ok?

3.1.2.1 Is Vinku ASIC (N7501) transmitting correct RF-power?

• GSM transmitter has to be active before Vinku’s output level can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurements can be done with a spectrum analyser and an RF probe. RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”). Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• EGSM900:

- Connect the RF probe to Z7504 input. The level should be about the same on both input pins. Check output level with at least the maximum (5) and the minimum (19) power levels.

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- Maximum power level – Output level should be about -15…-25 dBm

- Minimum power level – Output level should be about -45…-55 dBm

• GSM1800/GSM1900:

- Connect the RF probe to C7577 or C7575. The level should be about the same on both capacitors. Check output level with at least the maximum (0) and the minimum (15) power levels.

- Maximum power level – Output level should be about -25…-35 dBm

- Minimum power level – Output level should be about -55…-65 dBm

• Check if output levels of Vinku are as expected.

• NOTE! If VINKU ASIC is transmitting wrong TX power just in one or two GSM-bands, typically

this means that Vinku ASIC (N7501) is faulty or the ASIC is badly soldered. Of course SAW-filter Z7504 or balun T7502 can be also faulty/badly soldered and causing short-circuit, but probability to this is quite low. For example: VINKU is transmitting too low power in EGSM900-band but TXpower is ok in other GSM-bands. Then it’s almost clear that VINKU (N7501) is faulty or badly soldered and the component should be replaced.

Appendix A: RF Troubleshooting

3.1.2.1.1 RF operating voltage VBAT_ASIC ok?

• See section

“RF operating voltage VBAT_ASIC ok?”

3.1.2.1.2 Are Vinku (N7501) regulator voltages VREG1, VREG2 ok?

• GSM transmitter has to be active before VREG1 and VREG2 voltages can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurements can be done with an oscilloscope and a probe.

• VREG1: Connect the probe to C7543

• VREG2: Connect the probe to C7548 (or C7547)

• VREG1 and VREG2 voltage levels should be 2.65 – 2.86 V. Typical value is 2.7 V.

3.1.2.1.2.1 Vinku (N7501) RB_EXT voltage ok?

• GSM transmitter has to be active before Vinku’s RB_EXT voltage can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to R7521.

• RB_EXT voltage should be 1.325 – 1.375 V.

3.1.2.1.2.1.1 VREFRF01-voltage ok?

• Measurement can be done with an oscilloscope and a probe.

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• Connect the probe to R7503.

• VREFRF01 voltage should be 1.325 – 1.375 V. Typical value is 1.35 V.

3.1.2.1.2.1.1.1 Desolder R7503. Is VREFRF01 voltage still wrong?

• Remember to solder a new component to R7503 pads after the measurement.

3.1.2.1.2.1.1.1.1 Capacitors C7518, C7520 and C7570 working correctly?

• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that capacitors are

not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not help go to the next step.

3.1.2.1.2.1.1.1.2 Replace Vinku (N7501) or Hinku (N7500) or both

3.1.2.1.2.1.2 R7521 and R7504 in place and working correctly?

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• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and check R7521 and R7504 resistance values with

an ohmmeter.

3.1.2.1.2.1.3 VB_EXT voltage ok?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7518.

• VB_EXT voltage should be 1.325 – 1.375 V. Typical value is 1.35 V.

3.1.2.1.2.1.3.1 Is R7503 in place and working correctly?

• Check that the component is in place and solder joints are ok

• Disconnect the power supply from the phone and check R7503 resistance value with an ohmmeter

3.1.2.1.2.1.3.2 Capacitors C7518, C7520 and C7570 working correctly?

• Check that components are in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that capacitors are

not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not help go to the next step.

3.1.2.1.2.1.3.3 Replace Vinku (N7501) or Hinku (N7500) or both

3.1.2.1.2.2 Replace Vinku (N7501)

3.1.2.1.3 Are TX-IQ signal waveforms looking correct?

• These current mode signals are not possible to measure, but are tested with self-tests. So if there is no fail in 2.3

ST_CDSP_TX_IQ_TEST these signals should be ok. Otherwise Vinku (N7501) or RAP3G

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Appendix A: RF Troubleshooting

(D2800) is faulty. Notice that it is not possible to replace RAP3G ASIC.

3.1.2.1.4 Is the TXC-signal coming to Vinku ASIC (N7501) OK? Is signal level correct?

• GSM transmitter has to be active before TX control voltage TXC can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level first to the maximum (“5” in EGSM900 and “0” in GSM1800/GSM1900)

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7549

• Typical TX control voltage TXC timing should look somehow similar to figure 6.5.2 “

mode (DC offset 0 V)” (EGSM900 TX power level 5) and voltage levels should be roughly:

- EGSM900: 1.8 V while TX burst and 0 V otherwise.

- GSM1800/GSM1900: 1.8 V while TX burst and 0 V otherwise.

• Change the TX to the minimum power level (“19” in EGSM and “15” in GSM1800/GSM1900)

• Typical TX control voltage TXC levels should be now about:

- EGSM900: 1.0 V while TX burst and 0 V otherwise.

• GSM1800/GSM1900: 0.7 V while TX burst and 0 V otherwise.

3.1.2.1.4.1 R7514 in place and working correctly?

• Check that the component is in place and solder joints are ok

• Disconnect the power supply from the phone and check R514 resistance value with an ohmmeter

3.1.2.1.4.2 C7549 working correctly?

• Check that the component is in place and solder joints are ok

TXC in GSM

• Disconnect the power supply from the phone and check with an ohmmeter that C7549 is not short-circuited.

3.1.2.1.4.3 Retu ok?

3.1.2.1.5 Does GSM PA (N7502) get correct DET_SW_G -voltage from Vinku ASIC (N7501)?

• GSM transmitter has to be active before DET_SW_G voltage can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7595 pad. Notice: C7595 is a non-assembled component so the probe

should be connected to the pad that can be still found from the PWB.

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• DET_SW_G voltage should be about 2.8 V while TX burst and 0 V otherwise.

3.1.2.1.5.1 C7595 working correctly?

• Check that the component is in place and solder joints are ok

• Disconnect the power supply from the phone and check with an ohmmeter that C7595 is not

short-circuited.

3.1.2.1.5.2 Replace Vinku (N7501)

3.1.2.1.6 Are components in GSM power control loop in place and working ok?

R7516 and C7559

• Disconnect the power supply from the phone and use an ohmmeter to check that C7559 is not short-circuited. If short-circuit is found replace the capacitor.

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• Check R7516 resistance value with an ohmmeter and replace resistor if needed.

3.1.2.1.7 Is TX VCO signal level in the T7503 output high enough?

• GSM transmitter has to be active before TX VCO’s output level can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurements can be done with a spectrum analyser and an RF probe. RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”). Notice that GSM transmission has pulsed nature and VCO output power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• Check the level of the VCO frequency in T7503 outputs. The level should be about -30…-35 dBm in both output lines during GSM TX burst. If the signal level is correct in the input (about -25 dBm) but output level is not as expected then replace T7503. VCO shield has to be removed before measurement. Remember to solder the shield back after the phone repairing.

3.1.2.1.7.1 TX VCO G7502 output level high enough?

• GSM transmitter has to be active before TX VCO’s output frequency and output level can be measured. Procedure is explained in section “Transmitter troubleshooting”.

• Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and VCO output power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• Connect the RF probe to the T7503 input. VCO shield has to be removed before measurement. Remember to solder the shield back after the phone repairing.

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• Check if the frequency of the TX VCO is as expected. If the VCO signal is not found try to use wider span setting. The output level of the VCO should be about -25 dBm during GSM TX burst.

3.1.2.1.7.1.1 Replace TX VCO G7502

3.1.2.1.7.2 Replace balun T7503

3.1.2.1.8 Replace Vinku (N7501) or GSM PA (N7502)

• If the output level of Vinku is higher than wanted then replace GSM PA (N7502). Otherwise replace TX ASIC Vinku (N7501).

3.1.2.2 Does GSM PA (N7502) have enough RF-power in its input?

• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level to the maximum (“5” in EGSM900 and “0” in GSM1800/GSM1900)

Appendix A: RF Troubleshooting

• Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct frequency settings to the spectrum analyser. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• EGSM900: Connect the probe to J7521 (test point). The RF level should be roughly -15…-20 dBm.

• GSM1800 or GSM1900: Connect the probe to R7512 output. The RF level should be roughly -20…-

30 dBm.

3.1.2.2.1 EGSM900: Replace SAW Z7504

3.1.2.2.2 GSM1800/GSM1900: Is Vinku (N7501) output RF-signal coming correctly to the T7502 (Balun)?

• GSM transmitter has to be active before measurements Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level to the maximum (“0” in GSM1800/GSM1900)

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• Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• GSM1800 or GSM1900: Connect the probe to T7502 input. There are two input ports in T7502 because the input port is balanced. The RF level should be roughly -25 dBm in both inputs.

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Appendix A: RF Troubleshooting

3.1.2.2.2.1 Matching components ok?

GSM1800/GSM1900: C7575 and C7577

• Check that components are in place and solder joints are ok

• GSM1800 and GSM1900: Disconnect the power supply from the phone and use an ohmmeter to

check that capacitors C7575 and C7577 are not short-circuited. If short-circuit is found replace the faulty capacitor.

3.1.2.2.3 GSM1800/GSM1900: Is there correct RF power in the balun (T7502) output?

• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level to the maximum (“0” in GSM1800/GSM1900)

• Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct

frequency settings to the spectrum analyser. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”).

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• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• GSM1800 or GSM1900: Connect the probe to R7512 input. The RF level should be roughly -20…30 dBm.

3.1.2.2.3.1 Replace balun T7502

3.1.2.2.4 GSM1800/GSM1900: Replace attenuator R7512

3.1.2.3 GSM PA (N7502) transmitting correct RF-power?

• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level to the minimum (“19” in EGSM900 and “15” in GSM1800/GSM1900)

• Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre

frequency should be set according the used TX channel (see section “Frequency mappings”).

• Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds.

• EGSM900: Connect the probe to J7520 (test point). The RF level should be about -16…-17 dBm.

• GSM1800 or GSM1900: Connect the probe to J7519 (test point). The RF level should be roughly

-29…-30 dBm in both bands.

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3.1.2.3.1 GSM PA (N7502) operating voltage ok?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7593

• Voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V.

3.1.2.3.1.1 PA operating voltage VBAT_PA ok?

• Measurement can be done with an oscilloscope and a probe.

• Connect the probe to C7569 (or C7564, C7583)

• Voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V.

3.1.2.3.1.1.1 Ferrite Z7500 ok?

• Check that component is in place and solder joints are ok

Appendix A: RF Troubleshooting

• Disconnect the power supply from the phone and use an ohmmeter to check that inductor is conducting DC.

3.1.2.3.1.2 C7593 ok?

• Check that the component is in place and solder joints are ok

• Disconnect the power supply from the phone and use an ohmmeter to check that the capacitor is

not short-circuited. If short-circuit is found replace the capacitor.

3.1.2.3.1.3 Replace inductor L7516

• If replacing doesn’t help then replace GSM PA (N7502)

3.1.2.3.2 Are bias currents coming correctly to the GSM PA (N7502)? Level ok?

EGSM: Icont_21 and Icont_22

GSM1800/GSM1900: Icont_31 and Icont_32

• GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”.

• Set TX power level to the maximum (“5” in EGSM900 and “0” in GSM1800/GSM1900)

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• Measurements can be done with an oscilloscope and a VOLTAGE probe.

• EGSM900:

- Connect the probe to C7545 or C7544. Notice: C7544 is a non-assembled component so the probe should be connected to the pad that can be still found from the PWB

- Typical full TX power bias currents (Icont_21 and Icont_22) should look somehow similar to figure

6.5.4 “Icont_21/Icont_22 (DC Offset 1.2 V)” when measured with an oscilloscope and a probe. Check

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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)

Rx AM suppression (GSM)

GSM transmitter tunings

Tx IQ tuning (GSM)

Tx power level tuning (GSM)

RM-84 WCDMA receiver tunings

Rx AGC alignment (WCDMA)

Rx band response calibration (WCDMA)

RM-84 WCDMA transmitter tunings

Tx AGC & power detector (WCDMA)

Tx band response calibration (WCDMA)

Tx LO leakage (WCDMA)

2.10 GSM transmitter self test (ST_CDSP_GSM_TX_POWER_TEST)