Nokia 3595 Service Manual 07npm10_3595RFtrouble

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CC Technical Documentation

NPM-10 (3595) Series Transceivers

Troubleshooting - RF

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Contents Page

RF Troubleshooting ....................................................................................................... 3

Abbreviations in Troubleshooting Charts ....................................................................3

Introduction ..................................................................................................................3

General Description of the RF Circuits .......................................................................4

Receiver Signal Path ................................................................................................. 4

Transmitter Signal Path............................................................................................. 5

PLL............................................................................................................................ 5

Key RF Component Placement................................................................................. 7

Power Supply Configuration..................................................................................... 8

Receiver .....................................................................................................................10

General Instructions for GSM 850 Rx Troubleshooting......................................... 10

Troubleshooting Chart for the GSM 850 Receiver................................................. 12

General Instructions for GSM 1900 Rx Troubleshooting....................................... 13

Troubleshooting Chart for PCS Receiver................................................................ 15

Measurement Points in the Receiver....................................................................... 17

Transmitter .................................................................................................................18

Measurement Points for the Transmitter................................................................. 18

General Instructions for GSM Tx Troubleshooting................................................ 19

Troubleshooting Chart for GSM 850 Transmitter................................................... 21

General instructions for PCS Tx troubleshooting................................................... 23

Synthesizer .................................................................................................................26

General Instructions for Synthesizer Troubleshooting............................................ 26

26 MHz Reference Oscillator (VCXO)................................................................... 27

VCO ........................................................................................................................ 28

Troubleshooting Chart for PLL Synthesizer.......................................................... 28

Measurement Points for the PLL ............................................................................ 31

Frequency Lists....................................................................................................... 33

Alignment ..................................................................................................................35

NPM-10 (3595) Manual Align with Phoenix.......................................................... 35

Rx Calibration......................................................................................................... 36

Rx Channel Select Filter ......................................................................................... 39

Rx Band Filter Response......................................................................................... 40

Tx Tuning ..................................................................................................................42

Tx Power Tuning GSM 850.................................................................................... 42

Tx Power Tuning PCS 1900.................................................................................... 44

Tx I/Q Tuning ............................................................................................................44

RF Control .................................................................................................................48

Call Testing ................................................................................................................48

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

RF Troubleshooting

Abbreviations in Troubleshooting Charts

Table 1: Troubleshooting Abbreviations

Abbreviation Definition

BB Base band

DC Direct current

ESD Electrostatic discharge

FEM Front End Module

LF Low frequency

LO Local oscillator

LPF Low pass filter

Introduction

Two types of measurements are used in this chapter. It will be specified if the measurement type is RF or LF.

• Use a spectrum analyzer with a high impedance probe for RF measurements.

PA Power amplifier

PLL Phase-locked loop

PWB Printed wiring board

RCT Radio communication tester

RF Radio Frequency

Rx Receiver

Tx Transmitter

UHF Ultra-high frequency

VCO Voltage-controlled oscillator

Also, it is recommended that you use a good phone as a benchmark for the measurement technique because signal levels can vary depending on the measurement setup. Measurements stated in this section were done with an HP85024 high-impedance probe.

Note: The test jigs have some losses which must be taken into consideration when calibrating the test system.

• Use a 10:1 probe and an oscilloscope to measure the LF (low frequency) and DC (direct current). The probe used in this chapter is an 10MΩ/8pF passive probe. If using another probe, keep in mind that the voltages displayed may be slightly different.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Always make sure the measurement set-up is calibrated when measuring RF parameters on the antenna pad. Remember to include the loss in the module test jig when realigning the phone.

Most RF semiconductors are static-discharge sensitive. Use ESD protection during repair (ground straps and ESD soldering irons). Mjoelner is moisture-sensitive, so parts must be pre-baked prior to soldering.

Apart from key components described in this section, there are a lot of discrete components (resistors, inductors, and capacitors) for which troubleshooting is done by checking whether the soldering of the component is done properly, and whether the component is missing from the PWB. Capacitors can be checked for short-circuits and resistors for value by means of an ohmmeter, but be aware that in-circuit measurements should be evaluated carefully.

In this chapter, both GSM and GSM 850 will be used for the lower band and both PCS and GSM 1900 will be used for the upper band.

General Description of the RF Circuits

Figure 1 and Figure 2 include different colors in the block diagrams. The GSM 850 signal route is red, the GSM 1900 route is green, and the common signal lines are blue. Control, supply voltage, and unused lines are shown in black.

Receiver Signal Path

The signal from the antenna pad is routed to the front end module (N700). The GSM 850 signal passes through the switch inside the FEM to TGSM_Rxout, and the GSM 1900 signal passes through the switch inside the FEM to PCS_Rxout.

R XSUPPL

FEM N700

SAW

R X

GSM

T X

R X

SAW

S T

VANTL / VANTM/ VANTH

Z60

BIA

INP

INM INP

INM

L M

M H

R FCONTROL S

INP

RX85

INM

RX190

RX180

YFILTE R

X R

D D V

PRE

-GAI

PRE

-GAI

VDDDI

DCN

RXI

RXQ

B X R

D D V

DCN

LPF

BBAM

LPF

BBAM

222

DCN

Mjoelner

LPF

BIQUA

2BIQUA D

N600

Figure 1: Receiver signal path

From the FEM PA, the GSM 850 signal is routed to the SAW filter (Z602). The purpose of the SAW filter is to provide out-of-band blocking immunity and to provide the LNA in Mjoelner (N600) with a balanced signal. The front end of Mjoelner is divided into an LNA and a pre-gain amplifier before the mixers.

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

The output from the mixer is fed to the Mjoelner BB where the signal is amplified in the BBAMP, and the low pass is filtered in LPF1 before the DC compensation circuits in DCN1. The DCN1 output is followed by a controlled attenuator and a second low pass filter (LPF2). The output from LPF2 is DC centered in DCN2 before being fed to the BB for demodulation.

The GSM 1900 signal chain is similar to GSM 850, but the signal is routed through the SAW filter (Z601).

Transmitter Signal Path

The I/Q signal from the BB is routed to the modulators for both 850 MHz and 1900 MHz. The output of the modulators is either terminated in a SAW filter (Z603) for GSM 850 or a balun (T602) for GSM 1900. The amplitude’s limited signal is then amplified in the PA of the FEM (N700). The internal FEM detector, some discrete components, and the Mjoelner IC (N600) make up the transmitter gain control circuitry. In order to establish the right Tx output power level, a sample of the signal is taken from the FEM detector and used in the gain control loop. The Tx signal from the FEM is routed to the antenna, which depends on the internal switch setting of the FEM.

VANTL / VANTM / VANTH

Controls

VTXLOL

FEM N700

S w

GSM

i t

PCN

DET

SAW Z603

VBATTRF

Balun

Loop

filter

VTXBH

VTX

PLFB1

PLFB2

Controls

OUTHP

OUTHM

OUTLP

OUTLM

DET

VPCH/VPCL

VDDDIG

VDDRXBB

PWC

1/2

1/4

Mjoelner

N600

TXP

TXC

VDDT

Suppl

filter

VTX

VR2

TXC

TXIM

TXIP/

TXQM

TXQP/

Figure 2: Transmitter signal path

PLL

The phase-locked loop (PLL) supplies local oscillator (LO) signals for the Rx and Tx mixers. In order to generate LO frequencies for the required GSM and PCS channels, a regular synthesizer circuit is used. All PLL blocks (except for the VCO, reference X-tal, and loop filter) are located in the Mjoelner IC.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

The reference frequency is generated by a 26 MHz, voltage-controlled X-tal oscillator (VCXO), which is located in Mjoelner. Only the X-tal is external. Twenty-six MHz is supplied to the BB, where a divide-by-2 circuit (located in the UPP IC) generates the BB clock at 13 MHz. The reference frequency is supplied to the reference divider (RDIV) where the frequency is divided by 65. The output of RDIV (400 kHz) is used as the reference clock for the phase detector (ϕ).

The PLL is a feedback control system, which controls the phase and frequency of the LO signal. Building blocks for the PLL include:

• Phase detector

•Charge pump

• Voltage-controlled oscillator (VCO)

• N-divider

• Loop filter

Note: As mentioned earlier, only the VCO, reference X-tal, and loop filter are external to the Mjoelner IC.

The VCO (G600) is the component that actually generates the LO frequency. The VCO generates a differential RF output based on the control voltage input. This signal is fed to the prescaler and N-divider in Mjoelner. Together, these two blocks divide the frequency by a ratio based on the selected channel. The divider output is supplied to the phase detector, which compares the frequency and phase to the 400 kHz reference clock. Based on this comparison, the phase detector controls the charge pump to either charge or discharge the capacitors in the loop filter. By charging/discharging the loop filter, the control voltage to the VCO changes and the LO frequency changes. Therefore, the PLL keeps the LO frequency locked to the 26 MHz VCXO frequency.

The loop filter consists of the following components: C639-C641 and R618-R619.

The PLL is operating at twice the channel center frequency when transmitting or receiving in the PCS band. For the GSM band, the PLL is operating at four times the channel frequency. Therefore, divide-by-2 and divide-by-4 circuits are inserted between the PLL output and LO inputs to the PCS and GSM mixers.

Table 2 shows the PLL frequency plan.

Table 2: PLL Frequency Plan

Frequency

Band

Channel #

System Frequency

Band [MHz]

PLL Frequency

Band [MHz]

GSM RxTx128 - 251 869.2 - 893.8

824.2 - 848.8

PCS RxTx512 - 810 1930.2 - 1989.8

1850.2 - 1909.8

3476.8 - 3575.2

3296.8 - 3395.2

3860.4 - 3979.6

3700.4 - 3819.6

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

As Table 2 indicates, the PLL must be able to cover the frequency range from 3296.8 MHz to 3979.6 MHz.

To PCS RX

mixer

2 22

To GSM RX

mixer

1/2

1/4

64/

1/2

To PCS

Modulator

1/4

222

To GSM

Modulator

Mjoelner

N600

VDDRXBB

Resistor Ext/R2H/R2

VBEXT

Ref. filter

VREF1

RFCONV_0(9)

Main Bias

Circuit

RBEXT

Key RF Component Placement

RESETX

VCOSENSE

Charge

Pump

Lock Detect

1/2

I/O

level shift

LOCNT

REFCNT

2,7k

NDIV ADIV

VCXO Bias

VDDRXBB

SENSE

Rpa

RDIV

R2H/

VDDTX

Sensor

BIST / Temp.

AFC/CAL

AGC

Control

Buf/

Digital

Control

Figure 3: Synthesizer block diagram

Buffer

VDDLO VDDPLL VDDPRE

VDDCP

CPOUT

VDDXO VDDBBB

REFOUT XTALM XTALP

INPLO

INMLO

VDDDIG

VDDDL SELADDR

RESETX

RF_EN

RF_CLK

RF_DATA

Synth supply

filter Vcp

supply

filter PLL

VCTRL

loop

filter

VCXO supply

filter

REFOUT (26MHz)

26MH

VCO (G600)

VBB (1.8V)

RESETX_Mjoel

VPLL

VXO

VVCO

Ref clk set

RFBUSX RFBUSDA RFBUSCLK

VR1A

VIO

VIO GENIO6

Refer to Table 3 and Figure 4 for key RF component locations.

Table 3: Key RF Components

Component Description

N600 Mjoelner RF IC

Z601 PCS Rx SAW

Z602 GSM Rx SAW

Z603 GSM Tx SAW

B600 26MHz crystal

G600 VCO (3.6GHz UHF VCO)

N700 Front End Module (FEM)

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Figure 4: Key RF Component Locations

Power Supply Configuration

All power supplies for the RF unit are generated in the UEM IC (D200). All power outputs from this IC have a decoupling capacitor at which the supply voltage can be checked.

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Figure 5 shows the power supply configuration used in the NPM-10 (3595) phone.

UEM

Battery

VR2

VR3

VR5

VR1A

VR6

VIO

MJOELNER

Vtx

VXO

VPLL

VCP

Vrx

Vbb

Vref1

VddXO Vddbbb

VddRXF

VddRXBB

Vbext

VddTX

Vdddig

VddPLL

VddLO VddPre

VddCP

Sel_addr

VddDL

Vref01

VR7

Vvco

VCO

module

Figure 5: Power supply configuration

The names in bold are signal names, which are used in the RF schematics. The names in the boxes within the Mjoelner and VCO refer to pin names on the respective ICs (N600, G600).

Table 4: Power Supply Details

RF Supply Name

VTX VR2 2.64 2.78 2.86 V

VXO VR3 2.64 2.78 2.86 V

VCP VR1A 4.75 V

VPLL VR5 2.64 2.78 2.86 V

UEM Supply Name

Minimum Type Maximum Unit

VRX VR6 2.64 2.78 2.86 V

VVCO VR7 2.64 2.78 2.86 V

VBB VIO 1.72 1.8 1.88 V

VREF2 VrelRF01 1.334 1.35 1.366 V

VBATT BATTERY 3.1 3.6 5.2 V

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Figure 6 shows the measuring points at the UEM (D200).

VR2=Vtx (C643) VR5=Vpll (C226)

VR7=Vvco (C224)

VR3=Vvcxo (C227)

VR6=Vrx (C225)

Vref01=Vref2 (C231)

Figure 6: Supply points at the UEM (D200)

Figure 7 shows the supply point at the Mjoelner (N600).

Figure 7: Supply point at the Mjoelner (N600)

Vio=Vbb (C621)

Receiver

General Instructions for GSM 850 Rx Troubleshooting

Use the following steps to troubleshoot the GSM 850 Rx:

1. Connect the phone to a PC with the module test jig.

2. Start Phoenix, and establish a connection to the phone.

3. Open the File menu, and click Scan for Product.

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

4. Open the Maintenance menu, point to Testing, and click RF Controls.

5. Select the following values on the RF Controls dialog box:

• Band = GSM 850

• Active Unit = Rx

• Operation Mode = Continuous

• Rx/Tx Channel = 190

• AGC = 9

Figure 8: GSM 850 Rx values on the RF Controls dialog box

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Troubleshooting Chart for the GSM 850 Receiver

Apply -55 dBm

881.6 MHz,

offset 67.71 kHz

from generator to

antenna connector

YES

Oscilloscope at

RX I/Q signal

704 mVpp

DC offset 1.38 V

freq. 67.64 kHz

Check FEM

RX 850 at

Pin6 of N700

-56 dBm

Oscilloscope

check

VANT1,VANT2

and VANT3 at

N70

signal 0V

Check Mjoelner

YES

GSM chain

functional

YES

Check

FEM

Spectrum analyzer

GSM SAW filter

Z602

output -59 dBm

Check SAW filter

Z602

YES

Spectrum analyzer

Check signal after

inductors L603 and

L602

-59 dBm

Check inductors

L603, L602

YES

Oscilloscope

VRX 2.7 V

check Mjoelner

serial interface

Check Base band

Figure 9: GSM 850 receiver troubleshooting chart

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Figure 10 shows the results of measuring with an oscilloscope at RXIP or RXQP on a working GSM 850 receiver.

• Signal general frequency = 881.66771 MHz

• Amplitude = -55 dBm

• Signal amplitude peak = 704 mV

• DC offset = 1.38 V

Figure 10: RX850 I/Q signal waveform

General Instructions for GSM 1900 Rx Troubleshooting

Use the following steps to troubleshoot the GSM 1900 Rx:

1. Connect the phone to a PC with the module test jig.

2. Start Phoenix, and establish a connection to the phone.

3. Open the File menu, and click Scan for Product.

4. Open the Maintenance menu, point to Testing, and click RF Controls.

5. Select the following values on the RF Controls dialog box:

• Band = GSM 1900

• Active Unit = Rx

• Operation Mode = Continuous

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

• Rx/Tx Channel = 661

• AGC = 9

Figure 11: GSM 1900 values on the Rx RF Controls dialog box

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Troubleshooting Chart for PCS Receiver

Apply -55 dBm

1960 MHz,

offset 67.71 kHz

from generator to

antenna connector

YES

Oscilloscope at

RX I/Q signal

416 mVpp

DC offset 1.35 V

freq. 67.68 kHz

Check FEM

RX 1900

at Pin 8 of N700

-58 dBm

YES

Oscilloscope

check

VANT1,VANT2

and

VANT2 at

N700

signal 0V

Check

Mjoelner

YES

PCS chain functional

YES

Spectrum analyzer

PCS SAW filter

Z601

output -66 dBm

Check

FEM

Check SAW filter

Z601

YES

Spectrum analyzer

Check signal after

inductors L611 and

L601

-66 dBm

Check inductors

L611, L601

YES

Oscilloscope

VRX 2.7 V check Mjoelner serial interface

Check Base band

Figure 12: GSM 1900 receiver troubleshooting chart

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Figure 13 shows the results of measuring with an oscilloscope at RXIP or RXQP on a working GSM 1900 receiver.

• Signal general frequency = 1960.06771 MHz

• Amplitude = -55 dBm

• Signal amplitude peak-peak 416 mV

• DC offset 1.35 V

Figure 13: RX1900 I/Q signal waveform

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Measurement Points in the Receiver

VANT1 Z700

VANT3 N700

Figure 14: Rx measurement points at the front-end module PA (N700)

RX850 Mjoelner input INML L602

RX850 SAW filter bal output Z602

RF Antenna (RX in) N700

RX850 Mjoelner input INPL L603

VANT2 Z700

RX1900 Mjoelner input INMM L611

RX850 Mjoelner input INPM L601

RX1900 SAW filter bal output Z601

RX850 SAW filter unbal input Z602

Figure 15: Measurement points at the Rx filters – Z601/Z602

RX1900 SAW filter unbal input Z601

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

RXQM D200

RXIM D200

Figure 16: Rx I/Q Signals, baseband shielding can

Transmitter

Measurement Points for the Transmitter

RXIP D200

RXQP D200

VANT1

VANT3

ANT (Tx out)

VANT2

Figure 17: Tx measurement points in the PA (N700) shielding can

VTXLO_G

VTX_B_P

OUT_D_TX

DET

VPCTRL_G

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

VTX

TXQM

TXQP

TXIP

Bal_Input2 PCS

OUT_D_TX

Figure 18: Tx measurement points in the Mjolner (N600) shielding can

Bal_Input1 PCS

Bal_Input1 GSM

OUT_G_TX

General Instructions for GSM Tx Troubleshooting

Use the following steps to troubleshoot the GSM Tx:

1. Apply an RF cable to the RF connector to allow the transmitted signal to act as normal. The RF cable should be connected to measurement equipment with at least a 10 dB attenuator. Otherwise, the test equipment may be damaged.

2. Start Phoenix, and establish a connection to the phone (e.g., FBUS, MBUS).

3. Open the File menu, and click Choose Product.

4. Select NPM-10.

TXIM

Bal_Input2 GSM

5. Open the Maintenance menu, point to Testing, and click RF Controls.

6. Select the following values on the RF Controls dialog box:

• Band = GSM 850

• Active Unit = Tx

• Operation Mode = Burst

• Rx/Tx Channel = 190

• Tx PA Mode = Free

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

• Tx Power Level = 5

• Tx Data Type = All 1

Figure 19: GSM Tx values on the RF Controls dialog box

7 Measure the output power of the phone; it should be around 32.0 dBm.

Remember the loss along the end launch connector in the test jig (around 0.3 dB).

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Troubleshooting Chart for GSM 850 Transmitter

Use a high impedance probe for the spectrum analyzer measurements in the following chart. Set the trace to maxhold because the signal is bursted.

Measure power on

ANT with power

meter or RCT

>31dBm

Yes

Check R759, C746

Measure pin 1 of

No No No No

FEM: -0dBm

Yes

Check FEM with

scope:

Vant1= 2.4 to 2.8V

Vant2, Vant3= 0V

VTX_B_P= 0

VTXLO_G= 2.8V

Yes

Measure BAL input to Z603

0dBm

Check Z603

(TX SAW filter)

Check VTX with

scope: 2.8V +

discretes around

YesYes

Check TX IP and

TXQP

(See Figure 22)

Yes

Check baseband

Check VPCTRL_G

with scope at pin

15 of N700

(See Figure 21)

Yes

Check N700

(FEM)

Check TXC with

scope

(See Figure 21)

Yes

Check Det with

scope

(See Figure 21)

Yes

Check N700

(detector) +

discrete around

Figure 20: GSM 850 transmitter troubleshooting chart

The following apply to Figure 21:

• GSM 850 band, Power level 5, Channel 190

•Black trace: TXP

• Green trace: TXC

• Red trace: Vpctrl_G @ R713 output

Check Mjoelner +

the serial bus

• Blue trace: VDet_G @ R704 input

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Figure 21: TXP, VPCTRL_G and TXC

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Troubleshooting the Modulation

The following plots show different situations of Tx IQ measurements. Depending on the time, the modulation may cause the signal to look differently.

Pink trace: TXQP Blue trace: TXIP - All 1 Pink trace: TXQP Bluetrace: TXIP - Random

Pink trace: TXQP Blue trace: TXIP - All 1 (Zoom In)

Figure 22: Tx I/Q waveforms

Pink trace: TXQP Blu etrace: TXIP - Random ( Zoom In)

I/Q signals look almost the same regardless if modulation is by "1" or by "0". There is no significant difference between TXIP and TXIM. The same is valid for TXQP and TXQM.

General instructions for PCS Tx troubleshooting

Use the following steps to troubleshoot the PCS Tx:

1. Apply an RF cable to the RF connector to allow the transmitted signal to act as normal. The RF cable should be connected to measurement equipment or at least to a 10 dB attenuator. Otherwise, the test equipment may be damaged.

2. Start Phoenix, and establish a connection to the phone (e.g., FBUS).

3. Open the File menu, and click Choose Product.

4. Select NPM-10.

5. Open the Maintenance menu, point to Testing, and click RF Controls.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

6. Select the following values on the RF Controls dialog box:

• Band = GSM 1900

• Active Unit = Tx

• Tx Power Level = 0

• Tx Data Type = All 1

Figure 23: PCS Tx values on the RF Controls dialog box

7. Measure the output power of the phone; it should be around 29.5 dBm. Remember the loss in the test jig (around 0.7 dB).

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Figure 24 shows a troubleshooting chart for the PCS transmitter

Measure power on

ANT with power

meter or RCT

>28dBm

Yes

Check R759, C746

No No No No

Measure

Pin_PCS:

-2dBm

Yes

Check FEM with

scope:

Vant1,Vant3 = 0

Vant2, Vant4=

2.4 to 2.8 V

VTX_B_P and

VTXLO_G= 2.8V

Yes

Measure BAL input to T600

-4dBm

Check T602

(PCS Balun)

Check VTX with

scope: 2.7V +

discretes around

YesYes

Check TXIP and

TXQP

(See Figure 22)

Yes

Check baseband

Check VPCTRL_P

with scope

(See Figure 25)

Yes

Check N700

(FEM)

Check TXC with

scope

(See Figure 25)

Yes

Check Det with

scope

(See Figure 25)

Yes

Check N700

(detector) +

discrete around

Figure 24: GSM 1900 transmitter troubleshooting chart

Check Mjoelner +

the serial bus

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

The following applies to Figure 25:

• PCS 1900 band, Power level 0, Channel 661

• Red trace: Vpctrl_P @ R713 output

Figure 25: VPCTRL_P

Note: TXIQ signals look the same in PCS and GSM

Synthesizer

There is only one PLL synthesizer generating local oscillator frequencies for both the Rx and Tx in both bands (PCS and GSM). The VCO frequency is divided by two for PCS operation or by four for GSM operation inside the Mjoelner IC.

General Instructions for Synthesizer Troubleshooting

Use the following steps to troubleshoot the synthesizer:

1. Start Phoenix, and establish a connection to the phone.

2. Open the File menu, and click Choose Product.

3. Select NPM-10.

4. Open the Maintenance menu, point to Testing, and click RF Controls.

5. Select the following values on the RF Controls dialog box:

• Band = GSM 1900

• Active Unit = Rx

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

• Operation Mode = Continuous

• Rx/Tx Channel = 661

Figure 26: Synthesizer values on the RF Controls dialog box

It is not possible to measure the output of the VCO (G600) directly because this component is placed underneath a shielding can without a detachable lid. However, it is possible to get an indication if the VCO outputs the correct frequency with a spectrum analyzer and a high impedance probe. To do this, probe R656 and C654. The frequency should be 3920 MHz and the power should be around –50 dBm.

26 MHz Reference Oscillator (VCXO)

The 26 MHz oscillator is located in the Mjoelner IC (N600). The coarse frequency for this oscillator is set by an external crystal (B600). The oscillator is used as a reference frequency for the PLL synthesizer and as the system clock for the baseband. The 26 MHz signal is divided by two to achieve 13 MHz inside the UPP IC (D400). The 26 MHz signal from the VCXO can be measured by probing R420 (measure on the UPP side of R420, which is the end that is not connected to C420). The level at this point is approximately 700 mVpp. The frequency of this oscillator is adjusted by changing the AFC-register inside the Mjoelner IC via the Mjoelner serial interface.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Example Signal Measured at VCXO output (R420)

Figure 27: VCXO 26 MHz waveform

VCO

The VCO generates frequencies in the range of 3296.8 MHz–3979.6 MHz when the PLL is running. The output frequency from the VCO is led to the local oscillator input of the Mjoelner IC (N600), where the frequency is divided by two or four so that they can generate all channels in GSM and PCS respectively. The frequency of the VCO is controlled by a DC-voltage (Vctrl) coming from the loop filter. The loop filter consists of the R618, R619, and C639-C641 components. The Vctrl range when the PLL is running (locked) is 0.4 V–2.4 V. Even if the PLL is not in a locked state (the Vctrl is out of range), there is some frequency at the output of the VCO (G600), which is between 3 GHz and 4 GHz. This is only true if the VCO is working and if the VCO power supply is present (2.7 V).

Troubleshooting Chart for PLL Synthesizer

Use the following settings in Pheonix to troubleshoot the PLL synthesizer in Figure 29.

1. Open the File menu, and click Choose Product.

2. Select NPM-10.

3. Open the Maintenance menu, point to Testing, and click RF Controls.

4. Select the following values on the RF Controls dialog box:

• Band = GSM 1900

• Active Unit = Rx

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

• Operation Mode = Continuous

• Rx/Tx Channel = 661

Figure 28: RF Controls settings for PLL troubleshooting

5. Troubleshoot using Figure 29.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Spectrum analyzer VCO

frequency (R656) 3920.0

MHz

Yes

PLL block functional

Oscilloscope VCXO power

supply (C620) 2.7 V

Yes

Oscilloscope VC XO out put

(R420) 26 MHz,

approx. 700 mVpp

Yes

Oscilloscope VCO power

supply (R656) 2.7 V

Yes

Oscilloscope PLL powe r

supply (C665 and C634)

ALL 2.7 V

Check UEM, Software,

phone not in function

VCXO is not functiona l,

check crystal (B6 00)

Check UEM, software,

phone not in function

Check UEM, software,

phone not in function

Yes

Spectrum analyzer VCO

output (R656) some signal

between 4 GHz and 4 GHz

Yes

Oscilloscope: Measure

control voltage (C641 )

between 0.5 V and 4.0 V

Yes

Check Mjoe lner (N600), UPP

(D400), FRBusClk (J608),

RFBusDA (J610), FRBusX

(J609), and Reset_Mjoel

Figure 29: PLL troubleshooting chart

VCO (N601) is not

functional

Check loop filter R618,

R619, C639-C641

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

If the phone stops working a short time after the power is turned ON, the 26 MHz system clock signal might not be getting to the UPP clock-input in the baseband. In this case, turn on the phone and verify the following:

• VCXO power supply (C620) = 2.7 V

• VCXO output (R420 – the end not connected to C420) is 26 MHz and approximately 700 mVpp

If this is not the case, check the reference crystal (B600), Mjoelner (N600), R420, R426, C420, and C426.

Measurement Points for the PLL

VCXO Vcc (C620)

VCXO Output (R420) Measure at this end!

Figure 30: Measurement point for VCXO supply

Figure 31: Measurement point for VCXO output

NPM-10 (3595)

h t

Troubleshooting - RF CC Technical Documentation

Measurement Points at the PLL/VCO

PLL Vcc (C634)

VCO Vcc (C654, R656) Be careful - do not short this point wit shield. The VCO Ou put is also detected here.

Figure 32: Measurement points at the PLL/VCO

PLL Vcc (C665)

Figure 33: Measurement point for PLL

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Frequency Lists

GSM 850

Ch TX RX VCO TX VCO RX Ch TX RX VCO TX VCO RX Ch TX RX VCO TX VCO RX

128 824.2 869.2 3296.8 3476.8 170 832.6 877.6 3330.4 3510.4 210 840.6 885.6 3362.4 3542.4 129 824.4 869.4 3297.6 3477.6 171 832.8 877.8 3331.2 3511.2 211 840.8 885.8 3363.2 3543.2 130 824.6 869.6 3298.4 3478.4 172 833 878 3332 3512 212 841 886 3364 3544 131 824.8 869.8 3299.2 3479.2 173 833.2 878.2 3332.8 3512.8 213 841.2 886.2 3364.8 3544.8 132 825 870 3300 3480 174 833.4 878.4 3333.6 3513.6 214 841.4 886.4 3365.6 3545.6 133 825.2 870.2 3300.8 3480.8 175 833.6 878.6 3334.4 3514.4 215 841.6 886.6 3366.4 3546.4 134 825.4 870.4 3301.6 3481.6 176 833.8 878.8 3335.2 3515.2 216 841.8 886.8 3367.2 3547.2 135 825.6 870.6 3302.4 3482.4 177 834 879 3336 3516 217 842 887 3368 3548 136 825.8 870.8 3303.2 3483.2 178 834.2 879.2 3336.8 3516.8 218 842.2 887.2 3368.8 3548.8 137 826 871 3304 3484 179 834.4 879.4 3337.6 3517.6 219 842.4 887.4 3369.6 3549.6 138 826.2 871.2 3304.8 3484.8 180 834.6 879.6 3338.4 3518.4 220 842.6 887.6 3370.4 3550.4 139 826.4 871.4 3305.6 3485.6 181 834.8 879.8 3339.2 3519.2 221 842.8 887.8 3371.2 3551.2 140 826.6 871.6 3306.4 3486.4 182 835 880 3340 3520 222 843 888 3372 3552 141 826.8 871.8 3307.2 3487.2 183 835.2 880.2 3340.8 3520.8 223 843.2 888.2 3372.8 3552.8 142 827 872 3308 3488 184 835.4 880.4 3341.6 3521.6 224 843.4 888.4 3373.6 3553.6 143 827.2 872.2 3308.8 3488.8 185 835.6 880.6 3342.4 3522.4 225 843.6 888.6 3374.4 3554.4 144 827.4 872.4 3309.6 3489.6 186 835.8 880.8 3343.2 3523.2 226 843.8 888.8 3375.2 3555.2 145 827.6 872.6 3310.4 3490.4 187 836 881 3344 3524 227 844 889 3376 3556 146 827.8 872.8 3311.2 3491.2 188 836.2 881.2 3344.8 3524.8 228 844.2 889.2 3376.8 3556.8 147 828 873 3312 3492 189 836.4 881.4 3345.6 3525.6 229 844.4 889.4 3377.6 3557.6 148 828.2 873.2 3312.8 3492.8 190 836.6 881.6 3346.4 3526.4 230 844.6 889.6 3378.4 3558.4 149 828.4 873.4 3313.6 3493.6 191 836.8 881.8 3347.2 3527.2 231 844.8 889.8 3379.2 3559.2 150 828.6 873.6 3314.4 3494.4 192 837 882 3348 3528 232 845 890 3380 3560 151 828.8 873.8 3315.2 3495.2 193 837.2 882.2 3348.8 3528.8 233 845.2 890.2 3380.8 3560.8 152 829 874 3316 3496 194 837.4 882.4 3349.6 3529.6 234 845.4 890.4 3381.6 3561.6 153 829.2 874.2 3316.8 3496.8 195 837.6 882.6 3350.4 3530.4 235 845.6 890.6 3382.4 3562.4 154 829.4 874.4 3317.6 3497.6 196 837.8 882.8 3351.2 3531.2 236 845.8 890.8 3383.2 3563.2 155 829.6 874.6 3318.4 3498.4 197 838 883 3352 3532 237 846 891 3384 3564 156 829.8 874.8 3319.2 3499.2 198 838.2 883.2 3352.8 3532.8 238 846.2 891.2 3384.8 3564.8 157 830 875 3320 3500 199 838.4 883.4 3353.6 3533.6 239 846.4 891.4 3385.6 3565.6 158 830.2 875.2 3320.8 3500.8 200 838.6 883.6 3354.4 3534.4 240 846.6 891.6 3386.4 3566.4 159 830.4 875.4 3321.6 3501.6 201 838.8 883.8 3355.2 3535.2 241 846.8 891.8 3387.2 3567.2 160 830.6 875.6 3322.4 3502.4 202 839 884 3356 3536 242 847 892 3388 3568 161 830.8 875.8 3323.2 3503.2 203 839.2 884.2 3356.8 3536.8 243 847.2 892.2 3388.8 3568.8 162 831 876 3324 3504 204 839.4 884.4 3357.6 3537.6 244 847.4 892.4 3389.6 3569.6 163 831.2 876.2 3324.8 3504.8 205 839.6 884.6 3358.4 3538.4 245 847.6 892.6 3390.4 3570.4 164 831.4 876.4 3325.6 3505.6 206 839.8 884.8 3359.2 3539.2 246 847.8 892.8 3391.2 3571.2 165 831.6 876.6 3326.4 3506.4 207 840 885 3360 3540 247 848 893 3392 3572 166 831.8 876.8 3327.2 3507.2 208 840.2 885.2 3360.8 3540.8 248 848.2 893.2 3392.8 3572.8 167 832 877 3328 3508 209 840.4 885.4 3361.6 3541.6 249 848.4 893.4 3393.6 3573.6 168 832.2 877.2 3328.8 3508.8 250 848.6 893.6 3394.4 3574.4 169 832.4 877.4 3329.6 3509.6 251 848.8 893.8 3395.2 3575.2

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

PCS 1900

Ch TX RX VCO TX VCO RX Ch T X RX VCO TX VCO RX Ch T X RX VCO TX VCO RX

512 1850.2 1930.2 3700.4 3860.4 612 1870.2 1950.2 3740.4 3900.4 712 1890.2 1970.2 3780.4 3940.4 513 1850.4 1930.4 3700.8 3860.8 613 1870.4 1950.4 3740.8 3900.8 713 1890.4 1970.4 3780.8 3940.8 514 1850.6 1930.6 3701.2 3861.2 614 1870.6 1950.6 3741.2 3901.2 714 1890.6 1970.6 3781.2 3941.2 515 1850.8 1930.8 3701.6 3861.6 615 1870.8 1950.8 3741.6 3901.6 715 1890.8 1970.8 3781.6 3941.6 516 1851 1931 3702 3862 616 1871 1951 3742 3902 716 1891 1971 3782 3942 517 1851.2 1931.2 3702.4 3862.4 617 1871.2 1951.2 3742.4 3902.4 717 1891.2 1971.2 3782.4 3942.4 518 1851.4 1931.4 3702.8 3862.8 618 1871.4 1951.4 3742.8 3902.8 718 1891.4 1971.4 3782.8 3942.8 519 1851.6 1931.6 3703.2 3863.2 619 1871.6 1951.6 3743.2 3903.2 719 1891.6 1971.6 3783.2 3943.2 520 1851.8 1931.8 3703.6 3863.6 620 1871.8 1951.8 3743.6 3903.6 720 1891.8 1971.8 3783.6 3943.6 521 1852 1932 3704 3864 621 1872 1952 3744 3904 721 1892 1972 3784 3944 522 1852.2 1932.2 3704.4 3864.4 622 1872.2 1952.2 3744.4 3904.4 722 1892.2 1972.2 3784.4 3944.4 523 1852.4 1932.4 3704.8 3864.8 623 1872.4 1952.4 3744.8 3904.8 723 1892.4 1972.4 3784.8 3944.8 524 1852.6 1932.6 3705.2 3865.2 624 1872.6 1952.6 3745.2 3905.2 724 1892.6 1972.6 3785.2 3945.2 525 1852.8 1932.8 3705.6 3865.6 625 1872.8 1952.8 3745.6 3905.6 725 1892.8 1972.8 3785.6 3945.6 526 1853 1933 3706 3866 626 1873 1953 3746 3906 726 1893 1973 3786 3946 527 1853.2 1933.2 3706.4 3866.4 627 1873.2 1953.2 3746.4 3906.4 727 1893.2 1973.2 3786.4 3946.4 528 1853.4 1933.4 3706.8 3866.8 628 1873.4 1953.4 3746.8 3906.8 728 1893.4 1973.4 3786.8 3946.8 529 1853.6 1933.6 3707.2 3867.2 629 1873.6 1953.6 3747.2 3907.2 729 1893.6 1973.6 3787.2 3947.2 530 1853.8 1933.8 3707.6 3867.6 630 1873.8 1953.8 3747.6 3907.6 730 1893.8 1973.8 3787.6 3947.6 531 1854 1934 3708 3868 631 1874 1954 3748 3908 731 1894 1974 3788 3948 532 1854.2 1934.2 3708.4 3868.4 632 1874.2 1954.2 3748.4 3908.4 732 1894.2 1974.2 3788.4 3948.4 533 1854.4 1934.4 3708.8 3868.8 633 1874.4 1954.4 3748.8 3908.8 733 1894.4 1974.4 3788.8 3948.8 534 1854.6 1934.6 3709.2 3869.2 634 1874.6 1954.6 3749.2 3909.2 734 1894.6 1974.6 3789.2 3949.2 535 1854.8 1934.8 3709.6 3869.6 635 1874.8 1954.8 3749.6 3909.6 735 1894.8 1974.8 3789.6 3949.6 536 1855 1935 3710 3870 636 1875 1955 3750 3910 736 1895 1975 3790 3950 537 1855.2 1935.2 3710.4 3870.4 637 1875.2 1955.2 3750.4 3910.4 737 1895.2 1975.2 3790.4 3950.4 538 1855.4 1935.4 3710.8 3870.8 638 1875.4 1955.4 3750.8 3910.8 738 1895.4 1975.4 3790.8 3950.8 539 1855.6 1935.6 3711.2 3871.2 639 1875.6 1955.6 3751.2 3911.2 739 1895.6 1975.6 3791.2 3951.2 540 1855.8 1935.8 3711.6 3871.6 640 1875.8 1955.8 3751.6 3911.6 740 1895.8 1975.8 3791.6 3951.6 541 1856 1936 3712 3872 641 1876 1956 3752 3912 741 1896 1976 3792 3952 542 1856.2 1936.2 3712.4 3872.4 642 1876.2 1956.2 3752.4 3912.4 742 1896.2 1976.2 3792.4 3952.4 543 1856.4 1936.4 3712.8 3872.8 643 1876.4 1956.4 3752.8 3912.8 743 1896.4 1976.4 3792.8 3952.8 544 1856.6 1936.6 3713.2 3873.2 644 1876.6 1956.6 3753.2 3913.2 744 1896.6 1976.6 3793.2 3953.2 545 1856.8 1936.8 3713.6 3873.6 645 1876.8 1956.8 3753.6 3913.6 745 1896.8 1976.8 3793.6 3953.6 546 1857 1937 3714 3874 646 1877 1957 3754 3914 746 1897 1977 3794 3954 547 1857.2 1937.2 3714.4 3874.4 647 1877.2 1957.2 3754.4 3914.4 747 1897.2 1977.2 3794.4 3954.4 548 1857.4 1937.4 3714.8 3874.8 648 1877.4 1957.4 3754.8 3914.8 748 1897.4 1977.4 3794.8 3954.8 549 1857.6 1937.6 3715.2 3875.2 649 1877.6 1957.6 3755.2 3915.2 749 1897.6 1977.6 3795.2 3955.2 550 1857.8 1937.8 3715.6 3875.6 650 1877.8 1957.8 3755.6 3915.6 750 1897.8 1977.8 3795.6 3955.6 551 1858 1938 3716 3876 651 1878 1958 3756 3916 751 1898 1978 3796 3956 552 1858.2 1938.2 3716.4 3876.4 652 1878.2 1958.2 3756.4 3916.4 752 1898.2 1978.2 3796.4 3956.4 553 1858.4 1938.4 3716.8 3876.8 653 1878.4 1958.4 3756.8 3916.8 753 1898.4 1978.4 3796.8 3956.8 554 1858.6 1938.6 3717.2 3877.2 654 1878.6 1958.6 3757.2 3917.2 754 1898.6 1978.6 3797.2 3957.2 555 1858.8 1938.8 3717.6 3877.6 655 1878.8 1958.8 3757.6 3917.6 755 1898.8 1978.8 3797.6 3957.6 556 1859 1939 3718 3878 656 1879 1959 3758 3918 756 1899 1979 3798 3958 557 1859.2 1939.2 3718.4 3878.4 657 1879.2 1959.2 3758.4 3918.4 757 1899.2 1979.2 3798.4 3958.4 558 1859.4 1939.4 3718.8 3878.8 658 1879.4 1959.4 3758.8 3918.8 758 1899.4 1979.4 3798.8 3958.8 559 1859.6 1939.6 3719.2 3879.2 659 1879.6 1959.6 3759.2 3919.2 759 1899.6 1979.6 3799.2 3959.2 560 1859.8 1939.8 3719.6 3879.6 660 1879.8 1959.8 3759.6 3919.6 760 1899.8 1979.8 3799.6 3959.6 561 1860 1940 3720 3880 661 1880 1960 3760 3920 761 1900 1980 3800 3960

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Ch TX RX V CO T X V CO RX Ch TX RX VCO TX V CO RX Ch TX RX VCO TX V CO RX

562 1860.2 1940.2 3720.4 3880.4 662 1880.2 1960.2 3760.4 3920.4 762 1900.2 1980.2 3800.4 3960.4 563 1860.4 1940.4 3720.8 3880.8 663 1880.4 1960.4 3760.8 3920.8 763 1900.4 1980.4 3800.8 3960.8 564 1860.6 1940.6 3721.2 3881.2 664 1880.6 1960.6 3761.2 3921.2 764 1900.6 1980.6 3801.2 3961.2 565 1860.8 1940.8 3721.6 3881.6 665 1880.8 1960.8 3761.6 3921.6 765 1900.8 1980.8 3801.6 3961.6 566 1861 1941 3722 3882 666 1881 1961 3762 3922 766 1901 1981 3802 3962 567 1861.2 1941.2 3722.4 3882.4 667 1881.2 1961.2 3762.4 3922.4 767 1901.2 1981.2 3802.4 3962.4 568 1861.4 1941.4 3722.8 3882.8 668 1881.4 1961.4 3762.8 3922.8 768 1901.4 1981.4 3802.8 3962.8 569 1861.6 1941.6 3723.2 3883.2 669 1881.6 1961.6 3763.2 3923.2 769 1901.6 1981.6 3803.2 3963.2 570 1861.8 1941.8 3723.6 3883.6 670 1881.8 1961.8 3763.6 3923.6 770 1901.8 1981.8 3803.6 3963.6 571 1862 1942 3724 3884 671 1882 1962 3764 3924 771 1902 1982 3804 3964 572 1862.2 1942.2 3724.4 3884.4 672 1882.2 1962.2 3764.4 3924.4 772 1902.2 1982.2 3804.4 3964.4 573 1862.4 1942.4 3724.8 3884.8 673 1882.4 1962.4 3764.8 3924.8 773 1902.4 1982.4 3804.8 3964.8 574 1862.6 1942.6 3725.2 3885.2 674 1882.6 1962.6 3765.2 3925.2 774 1902.6 1982.6 3805.2 3965.2 575 1862.8 1942.8 3725.6 3885.6 675 1882.8 1962.8 3765.6 3925.6 775 1902.8 1982.8 3805.6 3965.6 576 1863 1943 3726 3886 676 1883 1963 3766 3926 776 1903 1983 3806 3966 577 1863.2 1943.2 3726.4 3886.4 677 1883.2 1963.2 3766.4 3926.4 777 1903.2 1983.2 3806.4 3966.4 578 1863.4 1943.4 3726.8 3886.8 678 1883.4 1963.4 3766.8 3926.8 778 1903.4 1983.4 3806.8 3966.8 579 1863.6 1943.6 3727.2 3887.2 679 1883.6 1963.6 3767.2 3927.2 779 1903.6 1983.6 3807.2 3967.2 580 1863.8 1943.8 3727.6 3887.6 680 1883.8 1963.8 3767.6 3927.6 780 1903.8 1983.8 3807.6 3967.6 581 1864 1944 3728 3888 681 1884 1964 3768 3928 781 1904 1984 3808 3968 582 1864.2 1944.2 3728.4 3888.4 682 1884.2 1964.2 3768.4 3928.4 782 1904.2 1984.2 3808.4 3968.4 583 1864.4 1944.4 3728.8 3888.8 683 1884.4 1964.4 3768.8 3928.8 783 1904.4 1984.4 3808.8 3968.8 584 1864.6 1944.6 3729.2 3889.2 684 1884.6 1964.6 3769.2 3929.2 784 1904.6 1984.6 3809.2 3969.2 585 1864.8 1944.8 3729.6 3889.6 685 1884.8 1964.8 3769.6 3929.6 785 1904.8 1984.8 3809.6 3969.6 586 1865 1945 3730 3890 686 1885 1965 3770 3930 786 1905 1985 3810 3970 587 1865.2 1945.2 3730.4 3890.4 687 1885.2 1965.2 3770.4 3930.4 787 1905.2 1985.2 3810.4 3970.4 588 1865.4 1945.4 3730.8 3890.8 688 1885.4 1965.4 3770.8 3930.8 788 1905.4 1985.4 3810.8 3970.8 589 1865.6 1945.6 3731.2 3891.2 689 1885.6 1965.6 3771.2 3931.2 789 1905.6 1985.6 3811.2 3971.2 590 1865.8 1945.8 3731.6 3891.6 690 1885.8 1965.8 3771.6 3931.6 790 1905.8 1985.8 3811.6 3971.6 591 1866 1946 3732 3892 691 1886 1966 3772 3932 791 1906 1986 3812 3972 592 1866.2 1946.2 3732.4 3892.4 692 1886.2 1966.2 3772.4 3932.4 792 1906.2 1986.2 3812.4 3972.4 593 1866.4 1946.4 3732.8 3892.8 693 1886.4 1966.4 3772.8 3932.8 793 1906.4 1986.4 3812.8 3972.8 594 1866.6 1946.6 3733.2 3893.2 694 1886.6 1966.6 3773.2 3933.2 794 1906.6 1986.6 3813.2 3973.2 595 1866.8 1946.8 3733.6 3893.6 695 1886.8 1966.8 3773.6 3933.6 795 1906.8 1986.8 3813.6 3973.6 596 1867 1947 3734 3894 696 1887 1967 3774 3934 796 1907 1987 3814 3974 597 1867.2 1947.2 3734.4 3894.4 697 1887.2 1967.2 3774.4 3934.4 797 1907.2 1987.2 3814.4 3974.4 598 1867.4 1947.4 3734.8 3894.8 698 1887.4 1967.4 3774.8 3934.8 798 1907.4 1987.4 3814.8 3974.8 599 1867.6 1947.6 3735.2 3895.2 699 1887.6 1967.6 3775.2 3935.2 799 1907.6 1987.6 3815.2 3975.2 600 1867.8 1947.8 3735.6 3895.6 700 1887.8 1967.8 3775.6 3935.6 800 1907.8 1987.8 3815.6 3975.6 601 1868 1948 3736 3896 701 1888 1968 3776 3936 801 1908 1988 3816 3976 602 1868.2 1948.2 3736.4 3896.4 702 1888.2 1968.2 3776.4 3936.4 802 1908.2 1988.2 3816.4 3976.4 603 1868.4 1948.4 3736.8 3896.8 703 1888.4 1968.4 3776.8 3936.8 803 1908.4 1988.4 3816.8 3976.8 604 1868.6 1948.6 3737.2 3897.2 704 1888.6 1968.6 3777.2 3937.2 804 1908.6 1988.6 3817.2 3977.2 605 1868.8 1948.8 3737.6 3897.6 705 1888.8 1968.8 3777.6 3937.6 805 1908.8 1988.8 3817.6 3977.6 606 1869 1949 3738 3898 706 1889 1969 3778 3938 806 1909 1989 3818 3978 607 1869.2 1949.2 3738.4 3898.4 707 1889.2 1969.2 3778.4 3938.4 807 1909.2 1989.2 3818.4 3978.4 608 1869.4 1949.4 3738.8 3898.8 708 1889.4 1969.4 3778.8 3938.8 808 1909.4 1989.4 3818.8 3978.8 609 1869.6 1949.6 3739.2 3899.2 709 1889.6 1969.6 3779.2 3939.2 809 1909.6 1989.6 3819.2 3979.2 610 1869.8 1949.8 3739.6 3899.6 710 1889.8 1969.8 3779.6 3939.6 810 1909.8 1989.8 3819.6 3979.6 611 1870 1950 3740 3900 711 1890 1970 3780 3940

Alignment

NPM-10 (3595) Manual Align with Phoenix

Use the following steps to manually align the NPM-10 (3595).

Note: The alignments and calibrations must be performed in the order shown to give reliable results.

1. Start Phoenix, and establish a connection to the phone via FBUS. If you power up the powerboard before selecting FBUS, it works without any error messages.

2. Use a test jig or other device for the RF and bus connection.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

3. Open the File menu, and click Choose Product.

4. Select NPM-10.

5. Attenuation in the test jig RF connector alone is 0.3 dB for GSM 850 and 0.7 dB for GSM1900.

6. Use an RCT (radio communication tester), spectrum analyzer, or another suitable device for tuning or testing the phone. The default channels are 190 for GSM 850 and 661 for GSM 1900.

Saving data to the phone and loading data from the phone are different processes in the various tuning procedures. Always look at what is shown in the windows regarding these issues and act accordingly.

Rx Calibration

Use the following steps to calibrate the Rx:

1. Open the Maintenance menu, point to Tuning, and click Rx Calibration.

2. Select GSM 850 in the Band field on the Rx Calibration dialog box. The GSM 850 must be calibrated before the PCS 1900.

3. Click the Calibrate button.

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Figure 34 shows the current values stored in permanent memory.

Figure 34: Rx Band GSM 850 calibration values

4. Adjust the signal generator settings to the frequency and amplitude specified in the Calibration with band GSM850 message box.

5. Click OK. The 850 band is calibrated and automatically stored in PM.

6. Phoenix prompts for the 1900 MHz calibration while displaying the current values in PM.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

7. Adjust the signal generator settings to the frequency and amplitude specified in the Calibration with band GSM 1900 message box.

Figure 35: Rx Band GSM 1900 calibration values

8. Click OK.

9. New RSSI values are calculated and stored in PM.

NPM-10 (3595)

CC Technical Documentation Troubleshooting - RF

Rx Channel Select Filter

Use the following steps to calibrate the Rx channel select filter:

1. Open the Maintenance menu, point to Tuning, and click Rx Channel Select Filter Calibration.

2. Choose whether you want to load values from the phone on the Phoenix - (Rx Channel Select Filter Calibration) window.

3. Click the Auto Tune button.

Figure 36: Phoenix - Rx Channel Select Filter Calibration window

4. When finished, press the Stop button.

5. Click Yes on the Tune ending message box if you want to save the values to the phone.

Figure 37: Tune ending message box

Note: This calibration requires no input signal

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Rx Band Filter Response

Use the following steps to calibrate the Rx band filter response:

1. Open the Maintenance menu, point to Tuning, and click Rx Band Filter Response Compensation.

2. Click the Start, Read from PM area button.

3. Choose whether you want to load values from the phone on the Rx Band Filter

Response Compensation dialog box.

Figure 38: Rx Band Filter Response Compensation dialog box

4. Click the Manual Tuning button.

5. Adjust the signal generator settings as specified in the message box.

6. When finished, press the Stop, Write to PM area button.

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7. Click Yes on the Tune ending message box if you want to save the values to the phone.

Figure 39: Tune ending message box

8. Repeat steps 1-7 for the GSM 1900.

Note: This calibration requires a lot of different frequencies from the generator. If you have a signal generator with a frequency list option, you can use Auto Tuning (the dwell should be around 10 ms).

Figure 40: Phoenix - Rx Band Filter Response Compensation window for the GSM 1900.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Tx Tuning

Use the following steps to tune the Tx:

1. Open the Maintenance menu, point to Tuning, and click Tx Power Level Tuning.

2. Press the Start, Read from PM area button.

3. Use the following settings and considerations for tuning with a spectrum analyzer:

• A DC block and at least a 10 dB attenuator on the RF input port to protect

the spectrum analyzer

• A span of 0 Hz (the burst power should be measured)

• A resolution bandwidth of 1 MHz

• A video bandwidth of 1 MHz

• A sweep time of 10 msec

• A RF attenuation value of 30 dB

Reference level: if you set this to 40 dBm, you can tune both the low band (target output power of 32.0 dBm for power level 5) and highband (target output power of 29.5 dBm for power level 0) at the maximum output levels. The reference level must be reduced, to say 0 dB level when tuning the base level.

Trigger: Video. Set the level to 0 dbm. This must be lowered when you are setting the base level (base level target output power of -30 dBm). If you do not lower the video trigger level to below –30 dBm when tuning the base level, the spectrum analyzer will not be triggered when you are tuning the base level.

Center Frequency: 836.6 MHz (For GSM 850 band, channel 190 is used for Tx output power tuning). For GSM 1900, center frequency is 1880 MHz (mid Channel 661) for Tx output power tuning.

Tx Power Tuning GSM 850

When you enter Tx power level tunings, the Tx Power Level Tuning dialog box displays (Figure 41). Phoenix automatically loads the coefficients currently stored in PM. DUT should be transmitting at the channel and frequency shown in the lower left of the dialog box.

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Figure 41: GSM 850 values on the Tx Power Level Tuning dialog box

Use the following steps to tune the GSM 850 Tx:

1. Set the Tx data type modulation to 1, 0, or Random. (Select Random if a GSM tester is used so it can be synchronized to the burst.)

2. Select High in the Tx PA Mode field. (Do not use Low PA Mode tuning.)

3. The first power tuning should be setting the base level to –30 dBm.

4. Tune the values that appear bold in Figure 41 to the target values in the Target dBm column (highlighted in blue). Use the average burst power. Also, note that the PL5 target value is 32 dBm, not 32.5 dBm.

5. Click the Continue to next band button.

6. Phoenix calculates the coefficients for the remaining power levels, saves them to permanent memory, and proceeds to the 1900 MHz power level tuning.

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

Tx Power Tuning PCS 1900

Repeat steps 1-6 from the “Tx Power Tuning GSM 850” section above for the 1900 MHz. After you tune the power levels, which appear bold in Figure 42, click OK. Phoenix calculates the coefficients for the remaining power levels and saves them to permanent memory.

Figure 42: GSM 1900 values on the Tx Power Level Tuning dialog box

Tx I/Q Tuning

Use the following steps to tune the Tx I/Q:

1. Open the Maintenance menu, point to Tuning, and click Tx IQ Tuning.

2. Use the following spectrum analyzer settings for Tx I/Q tuning:

• Same center frequencies for GSM 850 (Ch190 = 836.6 MHz) and GSM 1900

(Ch661 = 1880 MHz) as in the Tx output power tuning

• Span = 200 kHz

•RBW = 10 kHz

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•VBW = 1 kHz

• Sweeptime = .5 seconds

• RF attenuation = 20 dB

• Reference level = 30 dBm

• Trigger = free run

3. Select where to get the values. Typically, you would click Load From Product.

4. Push the Start soft key.

5. Use the sliding arrows or the + and - keys to adjust the Tx I DC offset and Tx Q DC offset values to reduce the carrier frequency to a minimum. The carrier must be at least –30 dBc. Typically, carrier suppression is better than –40 dBc.

Figure 43: Tx IQ Tuning dialog box settings

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

6. Use the sliding arrows or the + and - keys to adjust the Amplitude difference and Phase difference values to reduce the lowest sideband frequency. The sideband must be reduced at least –35 dBc. Typically, sideband suppression is better than -40 dBc.

7. Ensure that the IQ tuning values meet the specifications for both 1 and 0 data types.

Figure 44: GSM 850 Tx IQ tuning values on the Set the spectrum analyzer message box

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8. Select the Save to Product box if you want to save the tuning values to the phone.

9. Push the Stop soft key. This ends tuning and saves the values to the phone if you have selected the Save to product box.

10. Repeat steps 1-11 for the PCS 1900 using channel 661. Figure 45 includes typical tuning values for the PCS 1900.

Figure 45: PCS 1900 Tx IQ tuning values on the Set the spectrum analyzer message box

NPM-10 (3595) Troubleshooting - RF CC Technical Documentation

RF Control

Use the following steps to check the receiver or transmitter without going in a call. This process is similar to a call, but you have control through the PC instead of the tester. Ensure that the GSM 850 Tx PA mode is set to High.

1. Open the Maintenance menu, point to Testing, and click RF Controls.

2. If you want to tune at other channels than the default, then you must select the channels first in RF control and then start the tuning.

Call Testing

A call is the ultimate test of the phone if the tunings are complete and the phone’s Tx and Rx are working properly. Use the following steps to manually test the phone with a call:

1. Set the communications tester to manual test.

2. Switch the phone to Normal if it was in Local Mode. Remember to have a test

3. A call can be made after the phone has registered to the communications tester.

4. In the Autocaller (Maintenance Testing) you can answer by ticking Answer when

Figure 46: RF Controls dialog box

simcard in the phone.

It is possible to let the phone answer via Phoenix.

button pushed and then push the button.

Nokia 3595 Service Manual 07npm10_3595RFtrouble

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents Page

RF Troubleshooting

Abbreviations in Troubleshooting Charts

Introduction

General Description of the RF Circuits

Receiver Signal Path

Transmitter Signal Path

Key RF Component Placement

Power Supply Configuration

Receiver

General Instructions for GSM 850 Rx Troubleshooting

Troubleshooting Chart for the GSM 850 Receiver

General Instructions for GSM 1900 Rx Troubleshooting

Troubleshooting Chart for PCS Receiver

Measurement Points in the Receiver

Transmitter

Measurement Points for the Transmitter

General Instructions for GSM Tx Troubleshooting

Troubleshooting Chart for GSM 850 Transmitter

General instructions for PCS Tx troubleshooting

Synthesizer

General Instructions for Synthesizer Troubleshooting

26 MHz Reference Oscillator (VCXO)

Troubleshooting Chart for PLL Synthesizer

Measurement Points for the PLL

Frequency Lists

Alignment

NPM-10 (3595) Manual Align with Phoenix

Rx Calibration

Rx Channel Select Filter

Rx Band Filter Response

Tx Tuning

Tx Power Tuning GSM 850

Tx Power Tuning PCS 1900

Tx I/Q Tuning

RF Control

Call Testing