Nokia 7710, rm-12 Troubleshooting Instruction

Customer Care Solutions

Technical Documentation

6-Troubleshooting Instructions

Issue 1 11/2004 COMPANY CONFIDENTIAL 1

CCS Technical Documentation

RM-12

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2 COMPANY CONFIDENTIAL Issue 1 11/2004

Introduction to RM-12 troubleshooting .........................................................................2

General guidelines for RM-12 troubleshooting ............................................................. 2

Tools needed for troubleshooting ............................................................................... 2

General guidelines .......................................................................................................2

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

Introduction to RF troubleshooting .............................................................................3

RF Key component placement ....................................................................................4

RF Measurement points .............................................................................................. 5

EGSM900, GSM1800 & GSM1900 Transmitter .......................................................... 6

General instructions for Tx troubleshooting ...............................................................6

Additional information for EDGE troubleshooting ..................................................12

EGSM900, GSM1800 and GSM1900 Receiver .......................................................... 21

General instructions for Rx troubleshooting ............................................................. 21

Synthesizer .................................................................................................................. 28

General instructions for synthesizer troubleshooting ................................................ 28

Baseband troubleshooting ........................................................................................... 33

Partially damaged device ..........................................................................................33

Most common symptoms reported by customer .......................................................33

Dead or jammed device troubleshooting .................................................................. 35

ASIC is changed ........................................................................................................ 40

Test points .................................................................................................................40

Selftests / “Contact service” on display ....................................................................40

Flashing troubleshooting ........................................................................................... 44

Power troubleshooting .............................................................................................. 47

Audio troubleshooting ............................................................................................... 53

Display troubleshooting ............................................................................................60

Pixel defects ..............................................................................................................65

Backlight troubleshooting (1) ................................................................................... 67

Backlight troubleshooting (2) ................................................................................... 68

Backlight troubleshooting (3) ................................................................................... 69

Hall sensor troubleshooting ......................................................................................70

Keyboard troubleshooting ......................................................................................... 71

Camera Module Troubleshooting ............................................................................. 72

Camera construction .................................................................................................79

Camera fault finding diagrams .................................................................................. 86

FM Radio troubleshooting ........................................................................................ 89

USB Problems (1) .....................................................................................................93

USB Problems (2) .....................................................................................................94

BC3 Bluetooth Troubleshooting ............................................................................... 95

MMC Troubleshooting (1) ........................................................................................ 99

MMC Troubleshooting (2) ...................................................................................... 100

Accessory troubleshooting ...................................................................................... 101

SIM troubleshooting ...............................................................................................102

Vibra Troubleshooting ............................................................................................106

Clocks and Reset troubleshooting ........................................................................... 107

RM-12

CCS Technical Documentation

Introduction to RM-12 troubleshooting

This document is intended to be a guide for localising and repairing electrical faults in the RM12 device. First there is a brief guide for fault localising. Then fault repairing is divided into troubleshooting paths.

Before any service operation you must be familiar with the RM-12 product and module level architecture. You have to also be familiar with the RM-12 specified service tools such as the Phoenix service software, flashing tools and software.

General guidelines for RM-12 troubleshooting

Tools needed for troubleshooting

• Service tools (as listed at service tools chapter in service manual)

• Laboratory power supply with current indicator

• Oscilloscope

• Digital multimeter etc. normal equipments

General guidelines

If the device cannot be turned on by any means, see “Dead device” troubleshooting. Current consumption (missing consumption) gives an idea whether the device is able to start

up. Dropping supply voltage or very large current consumption indicates a short circuit. Check whether the connection with Phoenix works and what can be discovered with Phoenix

(ADC-readings, baseband selftest, bb-calibrations etc.). Check display, keyboard and rocker faults visually. Force phone to LOCAL mode and make keyboard test by Phoenix.

NOTE! If liquid damage, stop repairing.

Flash phone before disassembling it if fault is not obvious and Phoenix connection is OK. Continue with specific troubleshooting procedure for the current fault. If flashing does not work go to “Flashing” troubleshooting. Due to CSP packages short circuits or broken solder joints are not easily seen. If the examined

signal seems to be continuously in low or high level, then measure for possible short circuit to ground (signal low) or to supply voltage (signal high). Note that if a problem is not found from any visible contact/component, it can be under CSPs where the signal is connected.

Care must be taken when assembling and disassembling the transceiver. Failure to do this may result in unnecessary damage to the device.

NOTE! If an ASIC is changed, see “ASIC Changed” troubleshooting flow chart.

Issue 1 11/2004 COMPANY CONFIDENTIAL 2

RM-12

CCS Technical Documentation

RF Troubleshooting

Introduction to RF troubleshooting

Measurements should be done using Spectrum analyzer with high-frequency high-impedance 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 N7300). 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 during 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) the troubleshooting of which is done by checking if sold ering 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 that in-circuit measurements should be evaluated carefully.

Please be also aware that all measured voltages or RF levels in this document are rough figures. Especially RF levels vary 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.

Note! If the measurement values of RM-12 are as mentioned in this RF troubleshooting guide, but there are still difficulties making calls with the device, then check the antenna contacts in PWB.

3 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

RF Key component placement

1900 RX SAW

900 RX SAW

CCS Technical Documentation

1900 LNA 1900 RX balun

4GHz VCO

Antenna Switch Module

Power Amplifier

900 TX SAW

VCO balun

1800 RX SAW

Helgo86 RF ASIC

26 MHz VCTCXO

1800/1900 TX balun

Figure 1: Component placement 1

Issue 1 11/2004 COMPANY CONFIDENTIAL 4

CCS Technical Documentation

RF Measurement points

RM-12

VANT_3

ASM_in_900TX

To antenna

VANT_2

VANT_1

ASM_in_1800/1900TX

Mode

Iref_900

VTXB_900

PA_in_900

VPCTRL_900

ASM_out_1900RX

ASM_out_1800RXASM_out_900RX

VPCTRL_1800/1900

PA_in_1800/1900

VBAT

RX_1900_saw _out

LNA_P

1900_RX_In

Iref_1800_1900

VTXB

_1800_1900

LNA_VCC

1800_RX_In

VPECTRL3(ALC)

900_RX_In

VR7

RFBusEna1/J7306

VR4

TXC

VR5

VR6

RXQ/J7303

RXI/J7302

TXP/J7300

TXA/J7301

TXQP/QN

TXIN/TXIP

VR1

VR2

VR3

26MHz to BB

VCTCXO

26Mhz out

RFBusReset/J7307 RFBusData/J7304

RFBusClk/J7305

Figure 2: Measurement points

5 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

CCS Technical Documentation

EGSM900, GSM1800 & GSM1900 Transmitter

General instructions for Tx troubleshooting

Kindly refer to the Service Software Section, Service Concept diagram. Connect test jig to computer with DAU-9S cable or to FPS-8 Flash Prommer with XCS-4 mod-

ular cable. Make sure that you have PKD-1 dongle connected to computer’s parallel port. Connect DC power supply to module test jig with FLC-2 cable.

NOTE! 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 (MJ-32) 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.

NOTE! 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, COMBOX driver when

using FPS-8.) Select product from the menu:

File -> Choose product -> RM-12

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 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

Issue 1 11/2004 COMPANY CONFIDENTIAL 6

CCS Technical Documentation

g

p

Transmitter troubleshooting diagrams

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?

Yes

No

Synthesizer troubleshootin

Tune TX coefficient values

Replace Helgo

RM-12

7 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

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

Check modulator output components OK?

No

HELGO IC troubleshooting

Replace faulty component(s)

Baseband troubleshooting

Synthesizer troubleshooting

Replace HELGO

Issue 1 11/2004 COMPANY CONFIDENTIAL 8

CCS Technical Documentation

p

)

p

RM-12

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

PA & Antenna Switch troubleshooting

No

Check component s 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

9 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

Pictures of transmitter signals

CCS Technical Documentation

Figure 6: Transmitter signals, VPCTRL

VPCTRL900 power level high at R7003 VPCTRL1800/1900 power level high at R7007

Figure 7: Transmitter signals

200mV/div

TX I/Q at R7304/7305 power level high Random data

100us/div

Issue 1 11/2004 COMPANY CONFIDENTIAL 10

CCS Technical Documentation

RM-12

500mV/div 100us/div

VANT_1 / GSM900 TX at C7100 VANT_2 / GSM1800 TX at C7102

VANT_3 / GSM1900 TX at C7101 OV (no signal/ Flatline on Oscilloscope screen)

500mV/div 100us/div

TXC at R7303

1

VTXB_900 at C7013 VTXB_1800_1900 at C7014

500mV/div 100us/div

TXP at J7300

11 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

m

A

CCS Technical Documentation

Figure 8: Tx out signal, 900 band, burst mode, channel 37

Ref Lvl

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

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 -> RM-12

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”)

Issue 1 11/2004 COMPANY CONFIDENTIAL 12

CCS Technical Documentation

• 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.

RM-12

13 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

g

p

CCS Technical Documentation

Figure 9: Transmitter EDGE troubleshooting

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

No

Yes

No

Yes No

TX signal found?

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

Start TX Edge power level tuning and check tuned coefficient values: Highest level ~0.684…0.841(GSM900); ~0.763…0.860(GSM1800&190 0) 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?

Check control voltages with oscilloscope: Pa Iref ~2V peak (GSM900) Pa Iref ~2.1V peak (GSM1800@1900) Mode ~1.8V OK?

PA & ant switch EDGE troubleshooting

Yes

TX OK

Check all power levels, OK?

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

Helgo EDGE troubleshootin

Check EDGE control loop components OK?

Replace faulty com

onents

Yes

Tune TX power levels, OK?

Synthesizer troubleshootin

Tune TX coefficient values

No

Replace Helgo

Issue 1 11/2004 COMPANY CONFIDENTIAL 14

CCS Technical Documentation

Figure 10: 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

Check modulator output components and VPECTRL3 signal

No

Helgo EDGE troubleshooting

Replace faulty component(s)

Baseband troubleshooting

Synthesizer troubleshooting

Replace HELGO

RM-12

15 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

p

)

p

)

CCS Technical Documentation

Figure 11: Pa & ant switch EDGE troubleshooting

PA & ant switch EDGE troubleshooting

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

Issue 1 11/2004 COMPANY CONFIDENTIAL 16

CCS Technical Documentation

Pictures of EDGE transmitter signals

Figure 12: I_ref_900 power level 8 at R7019/C7001

RM-12

Figure 13: VTXB 900 power level 8 at C7013

17 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

CCS Technical Documentation

Figure 14: I_ref_1800/1900 power level 2 at R7017/C7000

Figure 15: VTXB 1800/1900 power level 2 at C7014

Issue 1 11/2004 COMPANY CONFIDENTIAL 18

Figure 16: TXA 900/1800/1900 at C7309

Figure 17: TXI/TXQ signal at C7311/C7312/R7304/R7305

Figure 18: VPECTRL3 (ALC) signal at C7309

RM-12

CCS Technical Documentation

EGSM900, GSM1800 and GSM1900 Receiver

General instructions for Rx troubleshooting

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 the computer’s parallel port. Connect DC power supply to module test jig with FLC-2 cable. Set the DC supply voltage to 4.2V. Connect an RF-cable to the module test jig (MJ-32) RF connector and to RF signal generator. Set the phone module to test jig and start Phoenix service sofware. Initialize connection to phone. (Use FBUS driver when using DAU-9S, COMBOX driver when

using FPS-8.) Choose product from the menu:

File -> Choose product -> RM-12

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", "GSM 1800" or “GSM1900” (Default = "GSM900")

• Set Active unit to "Rx" (Default = "Rx")

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

For continuous mode:

• Set Operation mode to "Continuous"

• Set AGC to "12: FEG_ON + DTOS_ON + BB_30=Vgain60” (maximum gain setting used in normal mode)

(Default = "14: FEG_ON + DTOS_ON + BB_42=Vgain72")

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

Apply 942.46771 MHz (channel 37 + 67.710 kHz offset), 1842.86771 MHz (channel 700 +

67.710 kHz offset) or 1960.06771 MHz (channel 661 + 67.71 kHz) –90 dBm signal to the RFconnector (remember to compensate for cable attenuation).

Issue 1 11/2004 COMPANY CONFIDENTIAL 21

RM-12

CCS Technical Documentation

Measuring with an oscilloscope on "RXI" or "RXQ" following screens should be seen on a working GSM900, GSM1800 or GSM1900 receiver:

Figure 1: RX I/Q signal, burst mode, input level –90dBm

Receiver I or Q burst mode signal (channel 37) measured from testpoint RXI or RXQ with

942.46771 MHz signal, input level –90dBm at RF-connector. Correct signal amplitudes approximately:

• GSM900~170mVpp

• GSM1800~140mVpp

• GSM1900~160mVpp

Signal part frequency 67.7kHz sine. DC level of signal part is 1.35V. DC level can variate about +/-100mV between I and Q signals

and between different bands as well.

22 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

CCS Technical Documentation

Figure 2: GSM1900 RX I or Q signal (trace2), burst mode

GSM1900 receiver burst mode I or Q signal at ch 661 with input signal 1960.067MHz, level – 90 dBm at RF-connector.

Trace2: With wider time scaling both monitoring and own RX bursts are seen, 1

nd

is monitoring and 2

burst (longer) is own RX burst.

st

burst (shorter)

Trace1: External LNA VCC supply voltage at burst mode, input level –90 dBm. Measured from testpoint LNA_VCC.

Issue 1 11/2004 COMPANY CONFIDENTIAL 23

CCS Technical Documentation

Figure 3: RX I&Q, phase difference 90 deg between signals

RM-12

Detailed view of GSM900 continuous mode RX I and Q signals measured from testpoints RXI and RXQ simultaneously.

Used channel 37, input signal 942.46771 MHz, level –90 dBm at antenna port, AGC setting 12. Phase difference should be 90 degrees between RX I and Q signals at all bands.

24 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

A

q

A

–

A

)

A

Troubleshooting diagram for GSM900 receiver

Phone in “Continuous” mode, AGC setting “12”..

CCS Technical Documentation

pply –90dBm

942.46771MHz signal from generator to antenna connector

Osilloscope at RX_I signal 170mVpp DC offset 1.35*** Fre

uency 67.7kHz

Rx 900 chain functional

Check L809,L810

L7104, L7103

Figure 4: GSM900 receiver troubleshooting

Note! Generator level can be set higher if needed. Just note that levels will be different in whole chain respectively.

Spectrumanalyzer:

ntenna Switch

output GSM900

88dBm

Spectrumanalyzer: HELGO inputs GSM900 –89dBm

Oscilloscope VANT_1…3 0V

Check Antenna Switch Z800

Spectrumanalyzer:

ntenna Switch

input –88dBm

Z7100

Oscilloscope:Check HELGO serial interface (burst mode

Check C809

X7100

Check Baseband

Check SAW Z809

Z7101

Check SAW filter output

Oscilloscope: VR1,3…6 2.7V Check HELGO serial interface (burst mode)

Spectrumanalyzer: 4G VCO output

3769.6MHz ~-30dBm*

Check HELGO N500

N7300

Check Baseband

Synthesizer troubleshooting

Check HELGO N500

N7300

reading values are measured with 1 kohm passive probe (use tweezers to connect the probe ground to the nearest PWB ground). Reading value is represented without +26 dB compensation.

* Spectrumanalyzer reading with 1 kohm passive probe (right value add +26dB)

*** DC-level of RXI/RXQ in continuous mode will decrase slowly. The original level can be rest ored by rewriting gain set

ll spectrumanalyzer

Issue 1 11/2004 COMPANY CONFIDENTIAL 25

CCS Technical Documentation

A

q

A

)

A

Troubleshooting diagram for GSM1800 receiver

Phone in “Continuous” mode, AGC setting “12”.

RM-12

pply –90dBm

1842.86771MHz signal from generator to antenna connector

Osilloscope at RX_I signal 170mVpp DC offset 1.35*** Fre

uency 67.7kHz

Rx 1800 chain functional

Z7102,

Check Z808, L838,L839

L7105, L7106

Figure 5: GSM1800 receiver troubleshooting

Note! Generator level can be set higher if needed.

Spectrumanalyzer

ntenna Switch

output, GSM1800

-88dBm

Spectrumanalyzer HELGO inputs GSM1800 –88dBm

Just note that levels will be different in whole chain respectively.

Spectrumanalyzer input –84dBm

Oscilloscope VANT_1…3 0V

Check Antenna

Z7100

Switch Z800

ntenna Switch

Oscilloscope:Check HELGO serial interface (burst mode

Check C809

X7100

Check Baseband

Check Z808

Z7102

Check SAW filter output

Oscilloscope VR1,3…6 2.7V Check HELGO serial interface (burst mode)

Spectrumanalyzer 4G VCO output

3685.6MHz ~-30dBm*

Check HELGO N500

N7300

Check Baseband

Synthesizer troubleshooting

Check HELGO N500

N7300

ll spectrumanalyzer reading values are measured with 1 kohm passive probe (use tweezers to connect the probe ground to the nearest PWB ground). Reading value is represented without +26 dB compensation.

* Spectrumanalyzer reading with 1 kohm passive probe (right value add +26dB)

*** DC-level of RXI/RXQ in continuous mode will decrase slowly. The original level can be restored by rewriting gain set

26 COMPANY CONFIDENTIAL Issue 1 11/2004

RM-12

A

q

A

p

A

)

A

Troubleshooting diagram for GSM1900 receiver

Phone in “Continuous” mode, AGC setting “12”.

Figure 6: GSM1900 receiver troubleshooting

pply –90dBm

1960.06771MHz signal from generator to antenna connector

Note! Generator level can be set higher if needed. Just note that levels will be different in whole chain respectively.

CCS Technical Documentation

Osilloscope at RX_I signal 160mVpp DC offset 1.35***

uency 67.7kHz

Fre

Rx 1900 chain functional

Spectrumanalyzer: HELGO inputs GSM1900 –88dBm

Check LNA output from C829 –84dBm

Check Balun T701 output

Z7104

C808, C807

C7111, C7112

C7110

Spectrumanalyzer:

ntenna Switch

outputs, GSM1900

ut -88dBm

SAW in

Oscilloscope: VANT_3 2.7V VANT_1/2 0V

Spectrumanalyzer: RX_SAW_out – 90dBm (C826)

(C7108)

Oscilloscope: LNA_VCC 2.6 LNA_P 0V

Check Antenna Switch Z800

Z7100

Spectrumanalyzer:

ntenna Switch

input –84dBm

Oscilloscope:Check HELGO serial interface (burst mode

Check Z806

Oscilloscope: Check R800,

R7100

R810, L800

R7101, L7107

VR1,3…6 2.7V Check HELGO serial interface (burst mode)

Z7103

Check C809

X7100

Check Baseband

Check HELGO N500

N7300

Check Baseband

Oscilloscope: VR1,3…6 2.7V Check HELGO serial interface (burst mode)

Spectrumanalyzer: 4G VCO output 3920 MHz ~-30dBm*

Check HELGO N500

N7300

Check Balun

Check Baseband

Synthesizer troubleshooting

C7111,

Check C808, L805, C807

L7108, C7112

Check HELGO N500

N7300

ll spectrumanalyzer reading values are measured with 1 kohm passive probe (use tweezers to connect the probe ground to the nearest PWB ground). Reading value is represented without +26 dB compensation.

* Spectrumanalyzer reading with 1 kohm passive probe (right value add +26dB)

*** DC-level of RXI/RXQ in continuous mode will decrase slowly. The original level can be restored by rewriting gain set

Issue 1 11/2004 COMPANY CONFIDENTIAL 27

RM-12

CCS Technical Documentation

Synthesizer

General instructions for synthesizer troubleshooting

Connect test jig to computer with DAU9S cable or to FPS-8 Flash Prommer with XCS-4 modular cable.

Make sure that you have PKD-1 dongle connected to the computer’s parallel port. Connect DC power supply or FPS-8 to module test jig with PCS-1 cable. Set the DC supply voltage to 4.2V. Set the phone module to test jig and start Phoenix service sofware. Initialize connection to phone. (Use FBUS driver when using DAU9S, COMBOX driver when

using FPS-8.) Select product from the menu:

File -> Choose product -> RM-12

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", "GSM 1800" or "GSM1900" (Default = "GSM900")

• Set Active unit to "Rx" (Default = "Rx")

• Set Operation mode to "Continuous" (Default = "Burst")

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

28 COMPANY CONFIDENTIAL Issue 1 11/2004