Nokia 7280 Service Manual 06(b) RM14 rf trouble

Nokia Customer Care

6(b) - RF Troubleshooting

6(b) RF Troubleshooting

Instructions

and Manual Tuning

RM-14

Nokia Customer Care RF Troubleshooting and Manual Tuning

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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care

Table of Contents

Page No

Introduction .........................................................................................................5

Notes on reference measurements.................................................................... 5

Helgo / Synthesizer Troubleshooting................................................................6

N500 Helgo troubleshooting .............................................................................. 7

Synthesizer troubleshooting............................................................................... 8

Tx Troubleshooting............................................................................................. 9

Tx 900 GMSK troubleshooting......................................................................... 10

Tx 1800/1900 GMSK troubleshooting.............................................................. 11

Rx Troubleshooting ..........................................................................................12

Rx 900 troubleshooting.................................................................................... 13

Rx 1800 troubleshooting. ................................................................................. 14

Rx 1900 troubleshooting. ................................................................................. 15

Bluetooth / FM Radio Troubleshooting........................................................... 16

Bluetooth troubleshooting................................................................................ 17

FM radio troubleshooting................................................................................. 18

Service Tool Concept for RF Tunings .............................................................19

Service concept for RM-14 RF tunings............................................................ 20

Receiver Tunings............................................................................................... 21

RX channel select filter calibration................................................................... 21

RX calibration................................................................................................... 22

EGSM900 band ............................................................................................. 22

GSM1800 band ..............................................................................................24

GSM1900 band ..............................................................................................25

RX band filter response compensation............................................................ 26

EGSM900 band ............................................................................................. 27

GSM1800 band ..............................................................................................30

GSM1900 band ..............................................................................................31

T ransmit ter Tunings.......................................................................................... 33

TX power level tuning ...................................................................................... 33

EGSM900 PA High Mode with EDGE off .......................................................34

EGSM900 PA high mode with EDGE on ....................................................... 35

GSM1800 PA high mode with EDGE off ........................................................36

GSM1800 PA high mode with EDGE on ........................................................37

GSM1900 PA high mode with EDGE off ........................................................38

GSM1900 PA high mode with EDGE on ........................................................39

TX I/Q tuning.................................................................................................... 40

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Nokia Customer Care RF Troubleshooting and Manual Tuning

EGSM900 band with EDGE Off .....................................................................40

EGSM900 band with EDGE On .....................................................................42

EGSM1800 band with EDGE Off ...................................................................42

GSM1800 band with EDGE On .....................................................................42

GSM1900 band with EDGE Off .....................................................................42

GSM1900 band with EDGE On .....................................................................43

List of Figures

Page No

Fig 1 Helgo/Synthesizer........................................................................................6

Fig 2 PA/TX........................................................................................................... 6

Fig 3 Helgo/Synthesizer........................................................................................9

Fig 4 PA/TX........................................................................................................... 9

Fig 5 TX 900 GMSK troubleshooting ....................................................................10

Fig 6 TX 1800/1900 GMSK troubleshooting .........................................................11

Fig 7 Helgo/Synthesizer........................................................................................12

Fig 8 PA/TX........................................................................................................... 12

Fig 9 RX 900 troubleshooting................................................................................ 13

Fig 10 RX 1800 troubleshooting............................................................................ 14

Fig 11 RX 1900 troubleshooting............................................................................ 15

Fig 12 Bluetooth/FM.............................................................................................. 16

Fig 13 Bluetooth troubleshooting ..........................................................................17

Fig 14 FM radio troubleshooting ...........................................................................18

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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care

Introduction

This document is the troubleshooting guide for RM-14. On the following pages you will find a step-by-step fault finding procedure and reference measurements at the relevant signal points.

Note! Most test points are not accessible unless shielding cans are cut open. This must ONLY be done by the Return Analysis technicians and for analysis only!

■ Notes on reference measurements

• LF & DC signals are measured with Textronix 100 MHz Scope (TDS3014) and P3010 13pF probe.

• RF signals are measured with R&S FSIQ 7GHz Spectrum Analyzer and Agilent resistive divider probe (10dB, 500ohm).

• Please be aware that the RF connector on service adaptor is leaking power (into air) and acts as noise source when probing on RX chain. In 1800 band the problem is most severe while there is no external LNA to amplify the signal above the noise level like in the 1900 band. In 900 band the leakage is not as high due to lower frequency.

• GSM SA settings: RBW=500kHz, VBW=500kHz.

• Bluetooth SA settings: RBW=2MHz, VBW=2MHz.

• All reference measurements were made on a RM-14 phone (GSM900).

• RF loss Module Repair Jig: 900: 0.6 dB, 1800: 1.1dB and 1900: 1 .2dB. Bluetooth is 1.8dB.

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Nokia Customer Care RF Troubleshooting and Manual Tuning

Helgo / Synthesizer Troubleshooting

Figure 1:Helgo/Synthesizer

Figure 2:PA/TX

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■ N500 Helgo troubleshooting

N500 HELGO troubleshooting

Set Phoenix to RF local burst RX mode

Measure N500 Helgo supply voltages:

- VR1 at C551 - 4,75V?

-VR1 at C516 - 4,75V?

- VR2 at C520 - 2,8V?

-VR2 at C510 - 2,8V?

- VR3 at C503 - 2,8V?

-VR3 at C522 - 2,8V?

- VR4 at C554 - 2,8V?

-VR4 at C520 -2,8V?

- VR5 at C553 - 2,8V?

-VR5 at C518 -2,8V

- VR6 at C555 - 2,8V?

-VR6 at C521 -2,8V?

- VR7 at C297 - 2,8V? (located at BB bottom grid S3)

-VR7 at C500 -2,8V?

Measure N500 reference voltage:

VrefRF01 = 1,35V (C549)

1,44V

(C524)

Measure N500 serial bus signals

- RfBusClk at J501

- RfBusEna1 at J502

- Reset at J503

- RfBusData at J509 All measured in Burst Mode

.

Logic high level = 1,8V.

NOK

Check baseband.

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R420

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Nokia Customer Care RF Troubleshooting and Manual Tuning

■ Synthesizer troubleshooting

Synthesizer Troubleshooting

Phoenix: RF local mode Rx continuous

Frequency = 3770.4 MHz @ ch. 38

Measure G501 VCTCXO output voltage at G501 pin 3

26 MHz 900 mVpp. OK ?

Measure N500 26 MHz reference output voltage at L515 800 mVpp. OK?

Measure G501 VCTCXO AFC voltage at C540.

Measure RF frequency and level at T500.

Place the probe through the hole in the shield!

Correct frequency found?

NO

No frequency or wrong frequency ?

No frequency found within the 3-4 GHz span

YES

Measure VCO supply voltage at C560

C501

= 2.8 V OK ?

YES

C52

YES

Synthesizer is ok

Wrong frequencies found

YES

Measure VCO control voltage at C505. Voltage = 4.8V?

NO

VCO does not work or the control loop is open

C504

Replace VCO

Check C503, R501, R502,

Check R502, C503, C504

C504, C505

R501 and C502

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Tx Troubleshooting

Figure 3:Helgo/Synthesizer

Figure 4:PA/TX

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TX850/900 GMSK t

Nokia Customer Care RF Troubleshooting and Manual Tuning

■ Tx 900 GMSK troubleshooting

Figure 5:TX 900 GMSK troubleshooting

TX 900 GMSK troubleshooting

Apply a 50 ohm load at the antenna connector of the jig. GSM900/ cha. 37 = 897.4 MHz, burst mode power level 10 Spectrum analyzer: RBW = 500 Khz and VBW = 500 kHz, center = 500 kHz and span = 20 MHz

Measure voltage of a) TXI at C529 and TXQ at C530, Txi and TXQ = 500 mVpp min. and 1.4 VDC during burst

Measure a) TXC = 800 mV during burst at R514 and b) TXP = 1.8 V during burst at J504 . Note: TXC voltage is a function of power level

roubleshooting

Measure modulator supply voltage VR2 = 2.7 V (C511, both terminals)

Measure RF level = -13 dBm at input of Z700 SAW filter C702

Measure RF level = -13 dBm at N700 PA input (R704 pin1)

Measure RF level = +10 dBm at N700 PA output TX_OUT_EGSM (Z800 pin1)

Measure N700 PA power detector DET = 850 mV during burst at R701.

Note: DET voltage is a function of power level

Measure N700 PA control voltage a) VPCTRL_G = 1.2 V during burst at R713 and N700 PA bias voltage. b) VTXB_G = 2.7V (C701). Note: VPCTRL_G voltage is a function of power level.

NOK

OK

Check baseband.

Check N500 Helgo.

Check Z700 Tx SAW.

Measure N700 PA supply voltage VBAT at C705

Measure RF level = 20 dBm at antenna pad J124

Measure Z800 antenna switch control signal voltages a) VANT_1 = 2.7 V at C811

b) VANT_2 = 0 V at C809 c) VANT_3 = 2.7 V at C810

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■ Tx 1800/1900 GMSK troubleshooting

Figure 6:TX 1800/1900 GMSK troubleshooting

TX1800/1900 GMSK troubleshooting

Apply a 50 ohm load at the antenna connector of the jig. GSM1800 ch. 700 = 1747,8 MHz, burst mode power level 5 GSM1900 ch. 661 = 1880,0 MHz, burst mode power level 5 Spectrum analyzer RBW = 500 kHz and VBW = 500 kHz and span = 20 MHz

Measure voltage of a) TXI at C529 and TXQ at C530, Txi and TXQ = 500 mVpp min. and 1.4 VDC during burst

Measure a) TXC = 800 mV during burst at R514 and b) TXP = 1.8 V during burst at J504 .

Note: TXC voltage is a function of power level

Measure modulator supply voltage VR2 = 2.7 V at L505

Measure RF level = -15 dBm at input of T700 Tx balun C714

Measure RF level = -10 dBm at N700 PA input R707 pin1

Measure RF level = -3 dBm at N700 PA output TX_OUT_DCS (Z800)

NOK

Measure N700 PA power detector DET = 810 mV during burst at R701.

Note: DET voltage is a function of power level

Measure N700 PA control voltage a) VPCTRL_1800/1900 = 1.0 V during burst at R715 and N700 PA bias voltage

and N700 PA bias voltage b) VTXB_1800/1900 = 2.7 V (C709). Note: VPCTRL_1800/1900 voltage is a function of power level.

NOK

OK

Check baseband.

Check N500 Helgo.

Check T700 Tx balun.

Measure N700 PA supply voltage VBAT at C705

Measure RF level = 2 dBm at antenna pad J124

Measure Z800 antenna switch control signal voltages a) VANT_1 = 0 V at C811

b) VANT_2 = 2.7 V at C809 c) VANT_3 = 2.7 V at C810

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Nokia Customer Care RF Troubleshooting and Manual Tuning

Rx Troubleshooting

Figure 7:Helgo/Synthesizer

Figure 8:PA/TX

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■ Rx 900 troubleshooting

Figure 9:RX 900 troubleshooting

RX 900 Troubleshooting

GSM900 ch. 37. Continuous Rx. Use AGC “gain step” 14

Apply a signal of 942.46771 MHz (+67.71 kHz offset) at -90 dBm to the antenna pad J124

Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, center = 942 MHz and span = 20 MHz

Measure voltage of a) RXI (J512) b) RXQ (J513). RXI and RXQ = 800 mVpp and 1.35 VDC.

Note: DC level drops after a while. Change the signal level to -30 dBm

OK

Measure RF level = -55 dBm at Z803 SAW filter input.

NOK

Measure Z800 antenna switch control signal voltages

a) VANT_1 = 0V (C811) b) VANT_2 = 0V (C809)

c) VANT_3 = 0V (C810).

OK

Measure RF level = -55 dBm at Helgo input (C808, both terminals).

NOK

go to “Helgo/Synthesizer troubleshooting”

OK

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Nokia Customer Care RF Troubleshooting and Manual Tuning

■ Rx 1800 troubleshooting

Figure 10:RX 1800 troubleshooting

RX 1800 Troubleshooting

GSM1800 ch. 700. Continuous Rx. Use AGC “gain step” 14

Apply a signal of 1842,86771 MHz (+67.71 kHz offset) at -90 dBm to the antenna pad J124

Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, center = 1840 MHz and span = 20 MHz

Measure voltage of a) RXI (J512) b) RXQ (J513). RXI and RXQ = 500 mVpp and 1.35 VDC.

Note: DC level drops after a while. Change the signal level to -30 dBm

OK

Measure RF level = -30 dBm at Z802 SAW filter input.

(Z800 antenna switch pin11)

NOK

Measure Z809 antenna switch control signal voltages

a) VANT_1 = 0V (C811) b) VANT_2 = 0V (C809)

c) VANT_3 = 0V (C810).

OK

Measure RF level (C807, not assembled, both terminals).

at Helgo input

NOK

go to “Helgo/Synthesizer troubleshooting”

OK

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■ Rx 1900 troubleshooting

Figure 11:RX 1900 troubleshooting

RX 1900 Troubleshooting

GSM1900 ch. 661. Continuous Rx. Use AGC “gain step” 12.

Apply a signal of 1960,06771 MHz (+67.71 kHz offset) at -90 dBm to the antenna pad J124.

Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, f = 1960 MHz and span = 20 MHz

Measure voltage of a) RXI (J512) b) RXQ (J513). RXI and RXQ = 700 mVpp and 1.35 VDC.

OK

Change the signal level to -50 dBm and set “gain step” = 6

Measure RF level at Z801 SAW filter input.

(Z800 antenna switch pin1)

NOK

Measure antenna switch control signal voltages

a) VANT_1 = 0V (C811) b) VANT_2 = 2.7V (C809)

c) VANT_3 = 2.7V (C810).

Measure RF level at V800 LNA input (C801).

Measure RF level at V800 LNA output (C804)

go to “Helgo/Synthesizer troubleshooting”

Measure a) V800 LNA supply voltage LNA_P = 2.8 V (V800 pin 4) and b) LNA control voltage LNAB_P = 2,8 V (R801)

Measure RF level at N500 Helgo input (L807).

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OK

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Nokia Customer Care RF Troubleshooting and Manual Tuning

Bluetooth / FM Radio Troubleshooting

Figure 12:Bluetooth/FM

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■ Bluetooth troubleshooting

Figure 13:Bluetooth troubleshooting

Bluetooth troubleshooting

Phoenix normal mode: Tx data 1 ch. 39 (2441 MHz approx. 1 MHz BW).

BC02 Bluetooth control. Options: Internal gain = 52 Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, center = 942 Mhz and span = 20 Mhz.

OK

Measure N130 BT supply voltage = 2.8V (C6036).

NOK

Replace N6031

OK

Measure N6030 VDD-ANA voltage regulator output = 1.8V (C6031)

OK

Measure a) N6030 VDD_VCO supply voltage = 1.8V (C6048)

b) VDD_MEM supply voltage = 1.8V c) Rx/Tx supply voltage = 1.8V (C130)

OK

Measure SYSCLK voltage = 800 mVpp (26 MHz) 1.8 VDC (C6038).

OK

Measure N6030 XTAL_IN voltage = 0.6Vpp square wave (R6042)

OK

Measure RF level = -15 dBm at a TX_A and TX_B, (C6046) at both terminals

NOK

Measure D6030 supply voltage = 2,8V at C6040

NOK

Check L6031, L6032. If passive components OK, replace D6030.

Check L6031, L6032. If passive componen OK, replace N6030

Replace N6030

Check L6033

Check L6033 and L130

and

and R6034

Check C6038 and go to Synthesizer troubleshooting.

NOK

OK

Measure RF level = -18 dBm at Z6030 SAW filter output.

NOK

ISSUE 1 11/04 COMPANY CONFIDENTIAL 17

Replace Z6030

RM-14

Nokia Customer Care RF Troubleshooting and Manual Tuning

■ FM radio troubleshooting

Figure 14:FM radio troubleshooting

FM Radio Troubleshooting

Phoenix: Testing -> FM radio -> Power on. FM signal: Frequency = 100 MHz, frequency deviation = 67.5 kHz, modulation fre-

quency = 1 kHz, R=L, pilot tone on and RF level -67 dBm. Signal is injected at X102 bottom connector pin 11, 12, 13 or 14. Alternative: Use FM signal received by headset.

Measure audio voltage a) VAFL = 200 mVpp (1 kHz) 850 mVDC (C6180, both sides

b) VAFR = 200mVpp (1 kHz) 850 mVDC (C6182, both sides).

NOK

Measure CPOUT voltage = 0.9 V @ 100 MHz (C6162).

OK

Measure RF level at antenna input (C6176).

OK

NOK

FM Radio OK

Check 6158, R6159, R6160, C6162 and C6157

Visual inspect C110, C111 and L1103

(all bottom side) and

C6179, C6176, C6178 and L6176

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Service Tool Concept for RF Tunings

All RF tunings for RM-14 phones must be carried out in MJ-34 Module Jig. Power to MJ-34 should be supplied from an external DC power supply, not MJ-34 input voltages:

• Maximum + 16 VDC

• Nominal input for RF tunings is +12 V DC Remember cable attenuation when setting required RF levels. RF tunings should be made in the same order as shown in this document, the order of the cor-

responding menu items in the Phoenix Service SW may be different. If baseband tunings are needed, they should be made before the RF tunings. Avoid unnecessary tuning – factory tuning values are always the most accurate ones. Views in this document may change as the service sof tware is developed. Please refer to the

Phoenix help files, phone model specific service manual and bulletins for help.

FPS-8 prommer.

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Nokia Customer Care RF Troubleshooting and Manual Tuning

■ Service concept for RM-14 RF tunings

Table 1:

Item Type Description Product code

1 MJ-34 Module jig 0780346 2 PCS-1 DC power cable 0730012 3 XRF-1 Modular cable 0730085 4 DAU-9S Service MBUS cable 0730108

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Receiver Tunings

■ RX channel select filter calibration

Extra equipment / external RF signal is not needed. Must be done before other RX calibrations. This function is used to calibrate RX channel select filter in GSM Phones. Rx Channel select filter is tuned only in one (lowest) band = Single calibration for all bands. Select Tuning => Rx Channel select filter calibration.

Press “Tune" to start the tuning.

Values will be saved to the phone when the “Save to Phone” tick box is checked. If the “Save to Phone” tick box is not checked, the values are not saved to the phone when

you stop the tuning or exit the dialog. Tuning values should be 0…31. Select “Stop”. Close the “RX Channel Select Filter Calibration“ dialog to end tuning.

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Nokia Customer Care RF Troubleshooting and Manual Tuning

■ RX calibration

RF generator is needed. This tuning performs RX Calibration. Must be done separately on all bands Calibration is automatically performed at EGSM (GSM900), then at GSM1800 and finally at the

GSM1900 band. If the tuning is successful, it continues in the next band. AFC tuning is carried out while EGSM (GSM900) band RX Calibration is performed. Remember to take jig and cable attenuations into account! Select Tuning => Rx calibration

!

EGSM900 band

Press "Start" to begin.

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Set RF generator to required EGSM900 frequency => OK

Tuning values and ADC readings will be shown Typical values and limits in (GSM900) RX Calibration:

Table 2:

GSM900 Typical value Low limit High limit

AFC value 0 -350 350 AFC slope 150 50 350 RSSI 0 68 58 78 RSSI 1 74 64 84 RSSI 2 80 70 90 RSSI 3 86 76 96 RSSI 4 92 82 102 RSSI 5 97 87 107 RSSI 6 103 93 113 RSSI 7 109 99 119 RSSI 8 115 105 125 RSSI 9 121 111 131 RSSI 10 127 117 137 RSSI 11 133 123 143 RSSI 12 139 129 149 RSSI 13 145 135 155 RSSI 14 151 141 161

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Nokia Customer Care RF Troubleshooting and Manual Tuning

Tuning will automatically move to the next band (GSM1800) when you press “Save & Contin- ue”.

GSM1800 band

When asked, set the RF generator to required GSM1800 frequency => OK

Tuning values and ADC readings will be shown. Typical values and limits in (GSM1800) RX Calibration:

Table 3:

GSM1800 Typical value Low limit High limit

RSSI 0 65 55 75 RSSI 1 71 61 81 RSSI 2 77 67 87 RSSI 3 83 73 93 RSSI 4 89 79 99 RSSI 5 94 84 104 RSSI 6 100 90 110 RSSI 7 106 96 116 RSSI 8 112 102 122 RSSI 9 118 108 128 RSSI 10 124 114 134 RSSI 11 130 120 140 RSSI 12 136 126 146 RSSI 13 142 132 152 RSSI 14 148 138 158

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Tuning will automatically move to the next band (GSM1900) when you press “Save & Contin- ue”

GSM1900 band

Set RF generator to required GSM1900 frequency => OK

Tuning values and ADC readings will be shown Typical values and limits in (GSM1900) RX Calibration:

Table 4:

GSM1900 Typical value Low limit High limit

RSSI 0 67 57 77 RSSI 1 73 63 83 RSSI 2 79 69 89 RSSI 3 85 75 95 RSSI 4 91 81 101 RSSI 5 98 88 108 RSSI 6 104 94 114 RSSI 7 110 100 120 RSSI 8 116 106 126 RSSI 9 122 112 132 RSSI 10 128 118 138 RSSI 1 1 134 124 144 RSSI 12 140 130 150 RSSI 13 146 136 156 RSSI 14 152 142 162

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Nokia Customer Care RF Troubleshooting and Manual Tuning

Tuning will be completed when you press “Save & Continue”. Close the “RX – Calibration” dialog to end tuning.

■ RX band filter response compensation

RF generator needed. Must be performed separately on all bands Start the RX calibration at EGSM (GSM900), then continue to the GSM1800 band and finally

to the GSM1900 band. Remember to carry out the RX calibration before carrying out Rx band filter response compen-

sation! Remember to take jig and cable attenuations into account! Select Tuning => Rx Band Filter Response Compensation

!

Select "Manual tuning" and “Start”. You will be asked to supply 9 different RF frequencies to the phone on each band. The tuning begins from EGSM900 band and continues the same way for GSM1800 and

GSM1900 bands.

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EGSM900 band

Set first required frequency and level => OK

Set 2nd required frequency and level => OK

Set 3rd required frequency and level => OK

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Set 4th required frequency and level => OK

Set 5th required frequency and level => OK

Set 6th required frequency and level => OK

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Set 7th required frequency and level => OK

Set 8th required frequency and level => OK

Set 9th required frequency and level => OK

Tuning values and ADC readings will be shown.

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Typical values and limits in Rx Band Filter Response Compensation EGSM900:

Table 5:

Channel

Input

frequency

[MHz]

Typical value

[dB]

Low limit

[dB]

High limit

[dB]

965 923.26771 +-3 -10 5 975 925.26771 +-1 -5 5 987 927.66771 +-1 -5 5 1009 932.06771 +-1 -5 5 37 942.46771 +-1 -5 5 90 953.06771 +-1 -5 5 114 957.86771 +-1 -5 5 124 959.86771 +-1 -5 5 136 962.26771 +-3 -10 5

Tuning will automatically move to the ne xt band (GSM1800) when you press “Save & Contin- ue”.

GSM1800 band

Repeat the same steps as for the EGSM900 band above. Typical values and limits in Rx Band Filter Response Compensation GSM1800:

Table 6:

Channel

Input

frequency

[MHz]

Typical value

[dB]

Low limit

[dB]

High limit

[dB]

497 1802.26771+-3 -10 5

512 1805.26771+-1 -5 5

535 1809.86771+-1 -5 5

606 1824.06771+-1 -5 5

700 1842.86771+-1 -5 5

791 1861.06771+-1 -5 5

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Table 6:

870 1876.86771+-1 -5 5

885 1879.86771+-1 -5 5

908 1884.46771+-3 -10 5

Tuning will automatically move to the ne xt band (GSM1900) when you press “Save & Contin- ue”.

GSM1900 band

Repeat the same steps as for the EGSM900 and GSM1800 bands above. Typical values and limits in Rx Band Filter Response Compensation GSM1900:

Table 7:

Channel

Input

frequency

[MHz]

Typical value

[dB]

Low limit

[dB]

496 1927.06771+-3 -10 5

512 1930.26771+-1 -5 5

537 1935.26771+-1 -5 5

586 1945.06771+-1 -5 5

661 1960.06771+-1 -5 5

736 1975.06771+-1 -5 5

794 1986.66771+-1 -5 5

High limit

[dB]

810 1989.86771+-1 -5 5

835 1994.86771+-3 -10 5

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Tuning will be completed when you press “Save & Continue”.

Close the “RX Band Filter Response Compensation” dialog to end tuning.

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Transmitter Tunings

■ TX power level tuning

Power Meter (or Spectrum analyzer) is needed. With Tx power level tuning, the coefficients are adjusted for each power level. Tuning must be performed separately on all band and all modes When EDGE is on, the tuning must be carried out for all power levels. Tx power level tuning steps are:

• EGSM900 PA High Mode with EDGE off

• EGSM900 PA High Mode with EDGE on

• GSM1800 PA High Mode with EDGE off

• GSM1800 PA High Mode with EDGE on

• GSM1900 PA High Mode with EDGE off

• GSM1900 PA High Mode with EDGE on Select Tuning => Tx power level tuning Remember to take jig and cable attenuations into account!

!

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EGSM900 PA High Mode with EDGE off

Select “Start”, the tuning begins automatically from the EGSM900 band.

Set Power Meter (or Spectrum analyzer) as required.

Note that TX PA mode is “High” at this point. The coefficient table lists the power level, coef ficient, target dBm and DAC value for each power

level. The tuned power level can be chosen by using up and down arrows or mouse. The current power level is shown with inverse colors. The tuning value can be adjusted with “-“ and “+” keys.

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Tune base level and power levels 19,15 and 5 to target level.

When tuning values are correct, choose “Save & Continue”. If all coefficients are within specified limit s, tuning will continue on the EGSM900 PA Low Mode

with EDGE off. Typical values:

Table 8:

Power level GSM900 EDGE off

5 0.650 … 0.850 15 0.140 … 0.200 19 0.120 … 0.170 Base 0.090 … 0.130

EGSM900 PA high mode with EDGE on

Set Power Meter (or Spectrum analyzer) as required. Repeat the same steps as for EGSM high and low mode above. When EDGE is on, the tuning must be made for all power levels.

Tune base level

When tuning values are correct, choose “Save & Continue”. If all coefficients are within specified limits, tuning will continue on th e EGSM900 PA low mode

with EDGE on.

ISSUE 1 11/04 COMPANY CONFIDENTIAL 35

and all power levels from 19 to 8 to target level.

RM-14

Nokia Customer Care RF Troubleshooting and Manual Tuning

Typical values:

Table 9:

Power level GSM900 EDGE on

8 0.500 … 0.650 9 0.400 … 0.550 10 0.350 … 0.500 11 0.320 … 0.470 12 0.300 … 0.440 13 0.280 … 0.400 14 0.250 … 0.350 15 0.230 … 0.330 16 0.210 … 0.310 17 0.200 … 0.300 18 0.190 … 0.290 19 0.180 … 0.280 Base 0.100 … 0.180

GSM1800 PA high mode with EDGE off

Set Power Meter (or Spectrum analyzer) as required. Repeat the same steps as for EGSM high and low mode above.

Tune base level

When tuning values are correct, choose “Save & Continue”. If all coefficients are within specified limit s, tuning will continue on the GSM1800 PA high mode

with EDGE on. Typical values:

and power levels 15,11 and 0 to target level.

Table 10:

Power level GSM1800 EDGE off

0 0.600 … 0.750 11 0.130 … 0.190 15 0.110 … 0.150 Base 0.090 … 0.130

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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care

GSM1800 PA high mode with EDGE on

Set Power Meter (or Spectrum analyzer) as required. Repeat the same steps as for EGSM high and low mode above. When EDGE is on, the tuning must be made for all power levels.

Tune base level

When tuning values are correct, choose “Save & Continue”. If all coefficients are within specified limit s, tuning will continue on the GSM1900 PA high mode

with EDGE off. Typical values:

and all power levels from 15 to 2 to target level.

Table 11:

Power level GSM1800 EDGE on

2 0.550 … 0.700 3 0.470 … 0.620 4 0.400 … 0.550 5 0.350 … 0.500 6 0.320 … 0.470 7 0.290 … 0.430 8 0.260 … 0.360 9 0.240 … 0.330 10 0.220 … 0.310 11 0.210 … 0.300 12 0.200 … 0.280 13 0.180 … 0.260 14 0.170 … 0.250 15 0.160 … 0.240 Base 0.090 … 0.160

ISSUE 1 11/04 COMPANY CONFIDENTIAL 37

RM-14

Nokia Customer Care RF Troubleshooting and Manual Tuning

GSM1900 PA high mode with EDGE off

Set Power Meter (or Spectrum analyzer) as required. Repeat the same steps as for EGSM high and low mode above.

Tune base level

When tuning values are correct, choose “Save & Continue”. If all coefficients are within specified limit s, tuning will continue on the GSM1900 PA high mode

with EDGE on. Typical values:

and power levels 15,11 and 0 to target level.

Table 12:

Power level GSM1900 EDGE off

0 0.600 … 0.750 11 0.130 … 0.190 15 0.110 … 0.150 Base 0.090 … 0.130

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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care

GSM1900 PA high mode with EDGE on

Set Power Meter (or Spectrum analyzer) as required. Repeat the same steps as for EGSM high and low mode above. When EDGE is on, the tuning must be made for all power levels.

Tune base level

When tuning values are correct, choose “Save & Continue”. Typical values:

and all power levels from 15 to 2 to target level.

Table 13:

Power level GSM1900 EDGE on

2 0.550 … 0.700 3 0.470 … 0.620 4 0.400 … 0.550 5 0.350 … 0.500 6 0.320 … 0.470 7 0.290 … 0.430 8 0.260 … 0.360 9 0.240 … 0.330 10 0.220 … 0.310 11 0.210 … 0.300 12 0.200 … 0.280 13 0.180 … 0.260 14 0.170 … 0.250 15 0.160 … 0.240 Base 0.090 … 0.160

If values shown are within limits select “Save & Continue”, values are saved to phone memory . Close the “TX Power Level Tuning” dialog to end tuning.

ISSUE 1 11/04 COMPANY CONFIDENTIAL 39

RM-14

Nokia Customer Care RF Troubleshooting and Manual Tuning

■ TX I/Q tuning

Spectrum analyzer is needed. Tx IQ tuning allows changing the Tx I DC Offset, Tx Q DC Offset, Amplitude difference and

Phase difference. Must be performed separately on all bands TX I/Q tuning steps are:

• EGSM (GSM900) with EDGE off

• EGSM with EDGE on

• GSM1800 with EDGE off

• GSM1800 with EDGE on

• GSM1900 with EDGE off

• GSM1900 with EDGE on Remember to take jig and cable attenuations into account! Select Tuning => TX IQ Tuning

!

EGSM900 band with EDGE Off

Select “Start” to begin tuning at EGSM900 band with EDGE off. Set spectrum analyzer to required settings => OK

The tuning is carried out by setting each of the sliders to desired value. The sliders can be changed only when the tuning is ongoing.

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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care

The order of tuning should be the same as the order of the sliders e.g. the Tx I DC Offset is tuned first and Phase difference is tuned last.

Use <= , =>, PgUp or PgDn keys The tuning is performed by setting each of the sliders to desired value.

Tune LO leak to minimum with TXI/TXQ DC of fset contro l (f0 on spectrum analyzer screen). Tune the wrong sideband to minimum using Amplitude/Phase difference controls (f0+68kHz

on spectrum analyzer screen).

Table 14:

Before tuning After tuning

ISSUE 1 11/04 COMPANY CONFIDENTIAL 41

RM-14

Nokia Customer Care RF Troubleshooting and Manual Tuning

Tx IQ Tuning limits are the same for all bands (GSM900, GSM1800 and GSM1900):

Table 15:

Tuning Limits EDGE off EDGE on

TX I DC Offset -4 … +4 -6 … +6 TX Q DC Offset -4 … +4 -6 … +6 Amplitude Difference -1.2 … +1.2 -1 … +1 Phase Difference 80 … 100 80 … 100

Tuning will automatically move to the next step, EGSM900 with EDGE on when you press “Save & Continue”.

EGSM900 band with EDGE On

Choose “Start” to begin tuning. Set the spectrum analyzer to required settings for EGSM900 band => OK Repeat the same tuning steps as for the EGSM900 with EDGE off above. Tuning will automatically move to the next step, EGSM1800 with EDGE off when you press

“Save & Continue”.

EGSM1800 band with EDGE Off

Choose “Start” to begin tuning. Set the spectrum analyzer to required settings settings for GSM1800 band => OK Repeat the same tuning steps as for the EGSM900 band above. Tuning will automatically move to the next step, EGSM1800 with EDGE on when you press

“Save & Continue”.

GSM1800 band with EDGE On

Choose “Start” to begin tuning. Set the spectrum analyzer to required settings for GSM1800 band => OK. Repeat the same tuning steps as for the EGSM900 band above. Tuning will automatically move to the next step, EGSM1900 with EDGE off when you press

“Save & Continue.

GSM1900 band with EDGE Off

Choose “Start” to begin tuning. Set the spectrum analyzer to required settings for GSM1900 band=> OK. Repeat the same tuning steps as for the EGSM900 band above. Tuning will automatically move to the next step, EGSM1900 with EDGE on when you press

“Save & Continue”.

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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care

GSM1900 band with EDGE On

Choose “Start” to begin tuning. Set the spectrum analyzer to required settings for GSM1900 band=> OK. Repeat the same tuning steps as for the EGSM900 band above. Tuning will be completed when you press “Save & Continue”. Choose “OK” to close the “TX I/Q Tuning” dialog.

ISSUE 1 11/04 COMPANY CONFIDENTIAL 43

RM-14

Nokia Customer Care RF Troubleshooting and Manual Tuning

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Nokia 7280 Service Manual 06(b) RM14 rf trouble

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

■ Notes on reference measurements

Helgo / Synthesizer Troubleshooting

N500 HELGO troubleshooting

Synthesizer Troubleshooting

Tx Troubleshooting

TX 900 GMSK troubleshooting

TX1800/1900 GMSK troubleshooting

Rx Troubleshooting

RX 900 Troubleshooting

RX 1800 Troubleshooting

RX 1900 Troubleshooting

Bluetooth / FM Radio Troubleshooting

Bluetooth troubleshooting

FM Radio Troubleshooting

Service Tool Concept for RF Tunings

■ Service concept for RM-14 RF tunings

Receiver Tunings

■ RX channel select filter calibration

■ RX calibration

EGSM900 band

GSM1800 band

GSM1900 band

■ RX band filter response compensation

EGSM900 band

GSM1800 band

GSM1900 band

Transmitter Tunings

■ TX power level tuning

EGSM900 PA High Mode with EDGE off

EGSM900 PA high mode with EDGE on

GSM1800 PA high mode with EDGE off

GSM1800 PA high mode with EDGE on

GSM1900 PA high mode with EDGE off

GSM1900 PA high mode with EDGE on

■ TX I/Q tuning

EGSM900 band with EDGE Off

EGSM900 band with EDGE On

EGSM1800 band with EDGE Off

GSM1800 band with EDGE On

GSM1900 band with EDGE Off

GSM1900 band with EDGE On