Nokia 6220 Service Manual 06 rh20 troubleshoot

Customer Care Solutions

RH-20 Series Transceivers

Troubleshooting Instructions

Issue 1 10/2003 Nokia Corporation

RH-20 Company confidential

Troubleshooting Instructions CCS Technical Documentation

Page 2 Nokia Corporation. Issue 1 10/2003

Company confidential RH-20

CCS Technical Documentation

RF Troubleshooting .......................................................................................................5

Introduction to RF troubleshooting .............................................................................5

RF Key component placement .....................................................................................6

RF Measurement points ...............................................................................................7

GSM900, GSM1800 & GSM1900 Transmitter .............................................................8

Additional information for EDGE troubleshooting .....................................................15

EGSM900, GSM1800 and GSM1900 Receiver ..........................................................23

Synthesizer ...................................................................................................................30

Baseband troubleshooting ............................................................................................35

Main Troubleshooting Diagram ................................................................................37

Phone is dead .............................................................................................................38

Flash Programming Fault ..........................................................................................39

Phone is jammed ........................................................................................................40

SIM card fault (Insert SIM / Card rejected) ...............................................................42

Keypad Fault ..............................................................................................................43

Display Fault ..............................................................................................................45

Illumination fault .......................................................................................................46

Charger Fault .............................................................................................................47

Accessory Fault .........................................................................................................48

Audio Fault ................................................................................................................49

Camera Troubleshooting ..............................................................................................53

Camera Fault ..............................................................................................................54

Camera troubleshooting diagram .................................................................................54

FM Radio troubleshooting ...........................................................................................55

FM Radio troubleshooting diagram ...........................................................................56

Draft 2 8/03 Copyright Nokia. All rights reserved.. Page 1

RH-20 Company confidential

CCS Technical Documentation

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Company confidential RH-20

CCS Technical Documentation

RF Troubleshooting

Introduction to RF troubleshooting

Measurements should be done using Spectrum analyzer with high-frequency high­impedance passive probe (LO-/reference frequencies and RF power levels) and Oscillo­scope with a 10:1 probe (DC-voltages and low frequency signals).

The RF-section is build around one RF-ASIC (HELGO N500). For easier troubleshooting,
this RF troubleshooting document is divided into sections.

Before changing HELGO, please check the following things: supply voltages are OK and
serial communication coming from baseband to HELGO.

Please note that the grounding of the PA module is directly below PA-module so it is dif­ficult to check or change. Most RF semiconductors are static discharge sensitive! So
ESD protection must be taken care of duriong repair (ground straps and ESD soldering
irons). HELGO and PA are moisture sensitive so parts must be pre-baked prior to solder­ing.

Apart from key components described in this document here are a lot of discrete compo­nents (resistors, inductors and capacitors) which troubleshooting is done by checking if
soldering of the component is done properly (for factory repairs checking if it is missing
from PWB). Capacitor can be checked for shortening and resistors for value by means of
an ohmmeter, but be aware in-circuit measurements should be evaluated carefully.

Please be aware that all measured voltages or RF levels in this document are rough fig­ures. Especially RF levels varies due to different measuring equipment or different
grounding of the used probe. When using RF probe usually a good way is to use metallic
tweezers to connect probe ground to PWB ground as close to measurement point as pos­sible.

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RF Key component placement

Figure 1: Component placement 1

ntenna switch

1900 RX Lna

1900 RX balun

1900 RX Saw

CCS Technical Documentation

1900/1800
TX Balun

TX 900 saw

PA

Helgo

VCTCXO

1800 RX Saw

900 RX Saw

VCO

VCO Balun

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A

A

A

A

A

CCS Technical Documentation

RF Measurement points

To Antenna

RX 1900 saw out

VANT_2

LNA P

SM Out Rx 900

LNA VCC

VANT_3

SM out 1800Rx

VANT_1

SM In Tx1800/1900

SM In Tx900

VPECTRL3(ALC)

VR2

RFBusEn

RFBusData

RFBusRes

RFBusClk

VR1

VR3

VCTCXO outpu

TXIN/TXIP

TXQN/QP

26MHz

VBATT

Figure 2: Component placement 2

SM out 1900Rx

1800/1900 PA in

VTXB 1800/1900

Pcrtl 1800/1900

MODE

Vpcrtl 900

VTXB 900

900 PA in

I_ref_1800/1900

I_ref_900

VTXLO 900

1900 RX in

1800 RX in

VR 4

900 RX in

VR 6

TXA

TXP

VR 5

VR 7

TXC

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CCS Technical Documentation

EGSM900, GSM1800 & GSM1900 Transmitter

General instructions for Tx troubleshooting

Kindly refer to the Service Software Section, Service Concept dagram (p.40)

Connect test jig to computer with DAU-9S cable or to FPS-8 Flash Prommer with XCS-4
modular cable.

Make sure that you have PKD-1 dongle connected to computers parallel port.

Connect DC power supply to module test jig with FLC-2 cable.

Attention: When repairing or tuning transmitter use external DC supply with at
least 3A current capability. Set the DC supply voltage to 4.2V.

Connect an RF-cable to the module test jig (MJS-38) RF connector and to measurement
equipment or at least a 10dB attenuator, otherwise the PA may be damaged. Normally a
spectrum analyzer is used as measurement equipment.

Attention: Normally Spectrum analyzer maximum input power is +30dBm. It is recom­mended to use 10dB attenuator on Spectrum analyzer input to prevent damage.

Set the phone module to test jig and start Phoenix service sofware

Initialize connection to phone. (use FBUS driver when using DAU9S and COMBOX driver
when using FPS-8)

Select product from the menu

File -> Choose product -> RH-20

From toolbar set operating mode to "Local"

Activate RF controls window from the menu

Testing -> RF Controls

From the RF controls window

- Select band "GSM900" or "GSM 1800" or "GSM1900" (Default = "GSM900")

- Set Active unit to "Tx" (Default = "Rx")

- Set Operation mode to "Burst" (Default = "Burst")

- Set Tx data type to "Random" (Default = "All1")

- Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band or 661 on

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CCS Technical Documentation

GSM1900 (Defaults)

- 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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Transmitter troubleshooting diagram

CCS Technical Documentation

Yes

Yes No

Check output signal level:
+32…+33dBm@897.4MHz(GSM900)
+29…+30dBm@1747.8 and 1880MHz
(GSM1800&1900)
OK?

No
No Yes

Yes No

Check with RF probe signal level on
PA input: ~ -1…+5dBm
OK?

No

Yes

Start TX power level tuning and check tuned coefficient values:
Highest level ~0.655…0.831(GSM900); ~0.567…0.782(GSM1800&1900)

Yes

Lowest level ~0.166…0.196(GSM900); ~0.176…0.225(GSM1800&1900)
Base level ~0.137…0.166(GSM900); ~0.132…0.161(GSM1800&1900)

Major differences?

No

Check control voltage with

Yes

oscilloscope:
PA Ctrl voltage >1.5V peak

No

OK?

Yes No

TX Troubleshooting

TX signal found?

PA & Antenna Switch
troubleshooting

Figure 3: Transmitter troubleshooting

TX OK

Check
all power
levels,
OK?

Check output signal
on 500MHz span
Signal found on incorrect
frequency?

Helgo
troubleshootin

Yes

Check control loop
components
OK?

Replace faulty
com

onents

Tune
TX power
levels,
OK?

Synthesizer
troubleshootin

Tune TX coefficient
values

Replace Helgo

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CCS Technical Documentation

Figure 4: HELGO IC troubleshooting

Check with oscilloscope:

-TXI/TXQ signals

No

-VR1, VR2, VR4, VR5, VR6 =2.8V

-VrefRF01 = 1.35V

-Helgo serial interface

-TXP & TXC signals
OK?

Yes

Check with RF probe:
4G VCO signal output:

No

-3589.6MHz (GSM900)

-3495.6MHz (GSM1800)

-3760MHz (GSM1900)
Level > - 10dBm
OK?

Yes

Yes

Check modulator output components
OK?

No

HELGO IC
troubleshooting

Replace faulty
component(s)

Baseband
troubleshooting

Synthesizer
troubleshooting

Replace HELGO

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CCS Technical Documentation

Check with RF probe signal level on PA

Yes Yes

input ~ -1…+5 dBm
OK?

Yes No

Check with oscilloscope:

-VBATT ~4V

-VTXB = 2.8V pulsed

-VPCTRL_900/1800/1900
OK?

Yes

Yes

PA & Antenna Switch
troubleshooting

No

Check components
around PA
OK?

No

Replace faulty

onent(s)

com

Figure 5: PA and Antenna Switch troubleshooting

Check with oscilloscope:

-VANT1 (GSM900)

-VANT2 (GSM1800)

-VANT3 (GSM1900)
OK?

Check VANT line
components
OK?

Yes No

Replace faulty

onent(s

com

Replace PA

Replace
HELGO

Replace ant.
switch

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CCS Technical Documentation

Pictures of transmitter signals

Figure 6: Transmitter signals

TXI

VPC

200mV/di

1

VPCTRL _900 power level high at R703/C703
VPCTRL_1800/1900 power level high at R704/C704

500mV/div 100us/div

VANT_1 / GSM900 TX at C805
VANT_2 / GSM1800 TX at R804

VANT_3 / GSM1900 TX at C806 OV
( no signal/ Flatline on Oscilloscope screen)

100us/di

200mV/div

100us/div

TX I/Q at R516/517 power level high Random data

_

1

500mV/div 100us/div

VANT_1,VANT_2,VANT_3

VTXB_900 at C713
VTXB_1800_1900 at C714

Issue 1 10/2003 Nokia Corporation. Page 13

500mV/div 100us/div

500mV/div MTB 100us/div

TXP at J504

RH-20 Company confidential

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A

Figure 7: Tx out signal, 900 band, burst mode, channel 37

CCS Technical Documentation

Ref Lvl

Ref Lvl

34 dBm

34 dBm

34

21 dB Offset

30

20

10

0

-10

-20

-30

-40

-50

Marker 1 [T1]

28.46 dBm

897.38997996 MHz

RBW 100 kHz

VBW 100 kHz

SWT 2 s

1

RF Att 40 dB

Unit dB

A

1M

-60

-66

Center 897.4 MHz Span 2 MHz200 kHz/

Date: 28.APR.2003 15:09:42

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CCS Technical Documentation

Additional information for EDGE troubleshooting

EDGE mode troubleshooting differs slightly from basic GSM troubleshooting.

Establish connection to the phone normally (see GSM900/1800/1900 troubleshooting
instructions).

Select product from the menu:

File -> Choose Product -> RH-20

From toolbar set operating mode to “Local”

Activate RF controls window from the menu:

Testing -> RF Controls

From the RF controls window:

Select Band “GSM900” or “GSM1800” or “GSM1900” (Default=”GSM900”)

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

Set Edge “On” (Default=”Off”)

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

Set Tx data type to “Alternate PN9” (Default=”All1”)

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

Set power level to 8 (Default = 19) on GSM900 or to 2 (Default = 15) on GSM1800 or
GSM1900

NOTE! For GSM900 Edge power levels 5, 6 and 7 are not in use and for GSM1800&1900 Edge power
levels 0 and 1 are not in use.

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CCS Technical Documentation

TX EDGE Troubleshooting

Yes

Yes No

Check output signal level:
+24…+30dBm@897.4MHz(GSM900)
+22…+29dBm@1747.8 and 1880MHz
(GSM1800&1900)
OK?

No
No Yes

Yes No

Check with RF probe signal level on
PA input:

No

~-8dBm@PCL=8 (GSM900)
~-10dBm@PCL=2 (GSM1800&1900)
OK?

Yes

Start TX Edge power level tuning and check tuned coefficient values:
Highest level ~0.684…0.841(GSM900); ~0.763…0.860(GSM1800&1900)

Yes

Lowest level ~0.333…0.420(GSM900); ~0.323…0.362(GSM1800&1900)
Base level ~0.273…0.313(GSM900); ~0.244…0.313(GSM1800&1900)

Major differences?

No

Check control voltages with

Yes

oscilloscope:
Pa Iref ~2V peak (GSM900)

No

Pa Iref ~2.1V peak (GSM1800@1900)
Mode ~1.8V OK?

Yes No

TX signal found?

PA & ant switch
EDGE troubleshooting

Figure 8: Transmitter EDGE troubleshooting

TX OK

Check
all power
levels,
OK?

Check output signal
on 500MHz span
Signal found on incorrect
frequency?

Helgo EDGE
troubleshootin

Yes

Check EDGE control
loop components
OK?

Replace faulty
com

onents

Tune
TX power
levels,
OK?

Synthesizer
troubleshootin

Tune TX coefficient
values

Replace Helgo

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CCS Technical Documentation

Figure 9: Helgo EDGE troubleshooting

Check with oscilloscope:

-TXI/TXQ signals

No

-VR1, VR2, VR4, VR5, VR6 =2.8V

-VrefRF01 = 1.35V

-Helgo serial interface

-TXP & TXC & TXA
OK?

Yes

Check with RF probe:
4G VCO signal output:

No

-3589.6MHz (GSM900)

-3495.6MHz (GSM1800)

-3760MHz (GSM1900)
Level > - 10dBm
OK?

Yes

Yes

Check modulator output components
and VPECTRL3 signal

No

Helgo EDGE
troubleshooting

Replace faulty
component(s)

Baseband
troubleshooting

Synthesizer
troubleshooting

Replace HELGO

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Figure 10: Pa & ant switch EDGE troubleshooting

PA & ant switch
EDGE troubleshooting

CCS Technical Documentation

Check with RF probe signal level on PA
input:
~ -8dBm@PCL=8 (GSM900)
~ -10dBm@PCL=2 (GSM1800&1900)
OK?

Yes No

Check with oscilloscope:

-VBATT ~4V

-Iref _900 ~2V peak

-Iref_1800_1900 ~2.1V peak

-VTXB = 2.8V pulsed

-Mode = ~1.8V
OK?

No

Check components
around PA
OK?

Yes No

Yes

Replace PA

Yes Yes

Yes

Check with oscilloscope:

-VANT1 (GSM900)

-VANT2 (GSM1800)

-VANT3 (GSM1900)
OK?

Check VANT line
components
OK?

Replace
HELGO

Replace faulty

onent(s

com

Replace ant.
switch

No

Replace faulty

onent(s)

com

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