Nokia 2600 Service Manual 06 RH59

Nokia Customer Care

6-T roubleshooting

Instructions

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Nokia Customer Care 6-Troubleshooting Instructions

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Table of Contents Page No

Baseband troubleshooting................................................................................. 7

Baseband test points ......................................................................................... 7

Troubleshooting diagrams ................................................................................. 7

Phone is dead.................................................................................................... 8

Flash programming do not work ........................................................................ 9

Power does not stay on or phone is jammed................................................... 10

Display information : "Contact Service"............................................................ 11

The phone do not register to the network, or the phone cannot make a call... 12

SIM related faults............................................................................................. 13

Insert SIM card fault ....................................................................................... 13

SIM-Card rejected .......................................................................................... 14

Audio related faults 1: Earpiece and microphone ............................................ 15

Audio related faults 2: Headset........................................................................ 16

Charging failure troubleshooting...................................................................... 17

Charging troubleshooting 2.............................................................................. 18

General RF Troubleshooting............................................................................ 19

RF key component placement ......................................................................... 20

RH-60 Receiver Troubleshooting .................................................................... 23

General instructions for GSM850 RX troubleshooting..................................... 23

Troubleshooting diagram for GSM850 Receiver ........................................... 24

General instructions for RH-60 GSM1900 RX troubleshooting........................ 26

Phoenix commands .......................................................................................26

Troubleshooting diagram for GSM1900Receiver ........................................... 27

Measurement points in the receiver ...............................................................29

RH-60 transmitter troubleshooting................................................................... 31

Measurement points for the transmitter .........................................................31

General instructions for RH-60 GSM TX troubleshooting................................ 32

GSM850 TX output power .............................................................................33

General instructions for RH-60 GSM1900 TX troubleshooting........................ 34

Phoenix commands .......................................................................................34

GSM1900 TX output power ........................................................................... 34

Troubleshooting diagram for GSM1900 TX..................................................... 35

General Instructions for RH-59 GSM900 RX Troubleshooting...................... 37

Troubleshooting chart for GSM900 receiver .................................................. 38

General instructions for GSM1800 RX troubleshooting................................... 40

Troubleshooting Chart for GSM1800Receiver ............................................... 41

Measurement points in the receiver ...............................................................42

RH-59 Transmitter troubleshooting.................................................................. 44

Measurement points for the transmitter .........................................................44

General instructions for RH-59 GSM TX troubleshooting................................ 45

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PCN Transmitter general instructions for PCN TX troubleshooting................. 47

Synthesizer...................................................................................................... 48

26 MHz Reference Oscillator ( VCXO ) ......................................................... 48

VCO ...............................................................................................................48

Troubleshooting diagram for PLL Synthesizer ...............................................49

Phone fails after power on ............................................................................. 50

Measurement points at the VCXO ................................................................. 50

Measurement points at the PLL/VCO ............................................................51

List of Figures

Page No

Fig 1 Phone is dead troubleshooting..................................................................... 6

Fig 2 Flash programming fault .............................................................................. 7

Fig 3 Phone jammed troubleshooting ................................................................... 8

Fig 4 Troubleshooting when Contact Service message seen............................... 9

Fig 5 No call troubleshooting................................................................................. 10

Fig 6 SIM troubleshooting..................................................................................... 11

Fig 7 Signal diagram............................................................................................. 11

Fig 8 Signal diagram............................................................................................. 12

Fig 9 Top: Earpiece troubleshooting, bottom: Microphone troubleshooting.......... 13

Fig 10 Headset troubleshooting............................................................................ 14

Fig 11 Charging troubleshooting 1........................................................................15

Fig 12 Charging troubleshooting 2........................................................................16

Fig 13 RF key components ................................................................................... 18

Fig 14 Supply points at UEM (D200).................................................................... 19

Fig 15 Supply point at Mjoelner (N600)................................................................. 19

Fig 16 GSM850 RF controls window..................................................................... 21

Fig 17 GSM850 Receiver troubleshootingt ...........................................................22

Fig 18 RX850 I/Q signal waveform ....................................................................... 23

Fig 19 GSM1900 RF controls ............................................................................... 24

Fig 20 GSM1900 receiver troubleshooting diagram.............................................. 25

Fig 21 RX1900 I/Q signal waveform .................................................................... 26

Fig 22 RX measurements point at the RX/TX Switch - Z700................................ 27

Fig 23 Measurements points at the RX-Filters – Z601/Z602 ................................ 27

Fig 24 RX I/Q signals, baseband shielding can UEM (D200) ............................... 28

Fig 25 TX measurement points in the PA ( N700 ) shielding can ........................ 29

Fig 26 TX measurement point in Mjolner (N600) shielding can............................ 29

Fig 27 :GSM850 RF controls window....................................................................30

Fig 28 VPCTRL_G & TXC..................................................................................... 31

Fig 29 GSM1900 RF controls screen shot............................................................32

Fig 30 GSM1900 TX troubleshooting.................................................................... 33

Fig 31 GSM900 RF controls window..................................................................... 35

Fig 32 EGSM receiver troubleshooting chart........................................................ 36

Fig 33 RX900 I/Q signal waveform ....................................................................... 37

Fig 34 GSM1800 RF control window ...................................................................38

Fig 35 GSM1800 receiver Troubleshooting chart ................................................. 39

Fig 36 RX1800 I/Q signal waveform ..................................................................... 40

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Fig 37 RX measurements point at the RX/TX Switch - Z700................................ 40

Fig 38 Measurements points at the RX-Filters – Z601/Z602 ................................ 41

Fig 39 RX I/Q Signals, baseband shielding can UEM (D200)............................... 41

Fig 40 TX measuremnet points in the PA ( N700 ) shielding can ........................ 42

Fig 41 TX measurement point in Mjolner (N600) shielding can............................ 42

Fig 42 GSM900 RF controls window ....................................................................43

Fig 43 VPCTRL_G and TXC signal ...................................................................... 44

Fig 44 RF controls window ...................................................................................45

Fig 45 VCXO 26 MHz waveform..........................................................................46

Fig 46 PLL Troubleshooting diagram....................................................................47

Fig 47 Figure 22: Measurement point for VCXO supply ....................................... 48

Fig 48 Figure 23: Measurement point for VCXO output........................................48

Fig 49 Measurement point for PLL........................................................................ 49

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Baseband Troubleshooting

■ Baseband test points

This document contains the Nokia 2600 troubleshooting diagrams. Test points are described and listed in the A3 schematic diagrams.

■ Tr oubleshooting diagrams

In this section, Troubleshooting diagrams is prov ided for the most common problems of the Nokia 2600

NOTE : Since both D200 (UEM) and D400(UPP) are underfilled, they can not be replaced. If either D200 or D400 is defective, the whole PWB has be discarded.

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■ Phone is dead

This means that the phone do not draw any current at all when supply is connected and/or powerkey is pressed.

It is assumed that the voltage supplied is 3.6 VDC. The UEM will pre vent any functionality what so ever at battery/supply levels below 2.9 VDC.

Phone is dead

Yes

X105

VBAT = 3,6VDC

Yes

L260,L261,L262,L263,L264,L265

C260,C261,C262,C263,C264,C265

Voltage = 3,6VDC

Yes

J404

Sleep-clock is

32.768 kHz, 1,8Vpp

Yes

J402

PURX = 1,8VDC,

1 sec. after power-key

is pressed

Yes

C227

VR3 = 2,78VDC

No

Check :

X105

Check :

L260,L261,L262,L263,L264,L265

C260,C261,C262,C263,C264,C265

Check :

B200, C209, C210, PW B. Else

defective D200*

Check :

PWB.

Else defective D200*

Check :

C227, PWB.

Else defective D200*

Yes

26 MHz clock min. 300mVACpp,

R426

probe Cin=10-13 pF/10M

Yes

No

Check :

C227, PWB.

Else defective D200*

Check :

D450 (Flash).

Else defective D200*

Figure 1:Phone is dead troubleshooting

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■ Flash programming do not work

The flash programming can only be done via the pads on the PWB (J396). In case of Flash failure in FLALI station, problem is most likely related to SMD problems. Pos-

sible failures could be short-circuit of balls under µBGAs (UEM, UPP, FLASH). Missing or misaligned components.

In flash programming error cases the flash prommer can give some information about a fault. The fault information messages could be:

- Phone doesn't set FBUS_TX line low Because of the use of uBGA components it is not possible to verify if there is a short circu it in

control- and address lines of MCU (UPP) and memory (flash).

Flash prgramming

do not work

Error fro m p ro mmer:

"Phone doesn't set FBUS_T X line low"

Yes

J396, R108

Check connection between

pad 1,2 & 3 on J396

and R108

Yes

J409, J410, J411, J412

Voltage level at 1,8VDC

Yes

Try re a d in g MCU ID

with Phoenix.

Reading OK?

Yes

Try reading Flash ID

with Phoenix.

Reading OK?

No

Check :

R108, PW B

Check :

PWB.

Else defective D200*

Check :

PWB.

Else defictive D400*

Check :

Replace D450

Yes

Reflash phone

Figure 2:Flash programming fault

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■ Power does not stay on or phone is jammed

If this kind of failure is presenting itself immediately after FLALI, it is most likely caused by ASICs missing contact with PWB.

If for some reason the MCU does not service the watchdog register within the UEM, the operations watchdog will run out after approximately 32 seconds. Unfortunately , the service routine can not be measured.

Power doesn't stay on,

or phone is jammed

J404

Sleep clock = 32.768 kHz,

1.8Vpp

Yes

J402

PURX = 1,8VDC,

1 sec. after power-key i s

pressed

Yes

UI functionality,

and keys react

to pressure?

Yes

R426

26 MHz clock min.

300mVACpp,

probe Cin=10-13 pF/10M

No

Check :

B200, C209, C210, PW B.

Else defective D200*

Check :

PWB.

Else defictive D200*

Check :

D450, Keymat,

Lightguide, PWB .

Else defective D400*

Check :

C420, C426, R420,

R426, N600(Mjoelner)

Yes

Reflash phone

Figure 3:Phone jammed troubleshooting

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■ Display information : "Contact Service"

This error can only happen at power up where several self-tests is run. If any of these test cases fails the display will show the message: "Contact Service".

It's individual test cases so the below lineup of error hunting's has no chronological order . Use common sense and experience to decide which test case to start error hunting at.

Display shows

"Contact Service"

Yes

EarDa & MicDa

between

UPP and UEM?

MBUS interface

between

UPP and UEM?

AuxDa & UEMInt

between

UPP and UEM?

SleepX & SleepClk

between UPP & UEM?

TXI/QD & RXI/QD?

SIM interface between

UPP & UEM

No

Check :

PWB.

Else defecti v e D20 0*

or D400*

Key is stucked

Flash checksum

y ASIC version vs. compilation flag, PMM checksum y PMM validity y Warrenty Information State y SIM-Lock

Check :

A-cover, Keymat, Lightguide,

PWB.

Reflash phone

Check :

PWB.

Else defective D450 (FL A S H)

Figure 4:Troubleshooting when Contact Service message seen

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■ The phone do not register to the network, or the phone cannot make a call

If the phone doesn't register to the network, the fault can be in either BB or RF . Only few signals can be tested since several signals is 'burried' in one or more of the inner layers of the PWB.

First of all check that SIM LOCK is not causing the error by using a Test-SIM card and connect the phone to a tester.

Phone do not register to

network

or phone cannot make a call

C222, C223, C224, C225,

C226, C227

Voltage = ~2,78VDC

All during GSM frame-

call mode.

Use TXP on C646 as trigger

Yes

C230, C231

Voltage = ~1,35VDC

All during GSM frame (call mode)

Use TXP on C646 as trigger

Yes

J421, J422, J423

Check RF serial bus during

GSM-frame :

Logic HIGH = 1,8VDC

Logic LOW = 0V DC

RFBUSC LK (J421),

RFBUSD A (J422),

RFBUSEN1X (J423)

Yes

R601, R603

Check analog signals during

GSM-frame (RX slot):

RXIP/N (R601) = 0-1,45VDC

RXQP/N (R603) = 0-1,45VDC

Check :

No

C222,C223, C224, C225,

C226, C 227 , P WB .

Else defective D200 or D400*

Check :

No

C230, C 231 , P WB .

Else defective

D200* or D400*

Check :

No

Else defective D200*

Check :

No

Else defective D200*

PWB.

or D400*

PWB.

or D400*

Yes

R610, R611

Check analog signals during

GSM-frame (TX slot):

TXIP/N (R610) = 1-1,75VDC

TXQP/N (R611) = 1-1,75VDC

Yes

No

Check :

R610, R 611 ,P WB .

Else defective D200*

or D400*

Check RF

Figure 5:No call troubleshooting

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■ SIM related faults

Insert SIM card fault

The hardware of the SIM interface from UEM (D200) to the SIM connector (X387) can be tested without a SIM card. When the power is switched on the phone first check for a 1,8V SIM card and then a 3V SIM card. The phone will try this four times, whereaf ter it will display ”Insert SIM card”.

Figure 6:SIM troubleshooting

Display shows :

"Insert SIM Card"

Yes

Verify that phone checks for

X387

1,8V-SIM, and then 3V-SIM

during power-up.

(See illustration below)

Yes

SIM Interface OK

Figure 7:Signal diagram

No

Check :

X387, R386, PWB.

Else defective D200*

Check for SIM voltage during power-up Ch1 : VSIM

Ch2 : RESET

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Ch3 : CLOCK Ch4 : DATA

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SIM-Card rejected

The error ”SIM card rejected” means that the A TR message received from SIM card is corrupted, e.g. data signal levels are wrong. The first data is always ATR and it is sent from card to phone.

For reference a picture with normal SIM power-up is shown below.

Normal SIM power-up sequence Ch1 : VSIM

Ch2 : RESET

Ch3 : CLOCK Ch4 : DATA

Figure 8:Signal diagram

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■ Audio related faults 1: Earpiece and microphone

Figure 9:Top: Earpiece troubleshooting, bottom: Microphone troubleshooting

Earpiece do not work

Replace :

Earpiece

Error still present

Z150, R161

Check Z150, R161 is

working correctly

(no short/open-circuit)

Yes

Defective D200*

Microphone do not work and

the isn't any mechanical

problem

Z100

Check Z100 is

working correctly

(no short/open-circuit)

Replace :

System Connoctor

No

Check :

R386, PWB.

Else defective D200*

Replace :

Z100

Error still present

R165

Check voltage level on

R165 towards UEM (bias)

= 2,1V

Yes

R153

Check voltage level on

R153 towards mic-lines (bias)

= 1,0V - 1,4V

No

Check :

R165, C168, PWB. Else defctive D200*

Check :

R153, R157,C151, C152,

C153, C154, PWB.

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■ Audio related faults 2: Headset

Figure 10:Headset troubleshooting

Headset earpiece do not

work and the isn't any

mechanical problem

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R183, Z102

Check R183, Z102 is

working correctly (no open-circuit)

Defective D200*

Headset microphone do not

work and the isn't any

mechanical problem

R166

Check voltage level on R166

towards UEM (bias) = 2,1V

Yes

R151

Check voltage level on R151

towards UEM (bias)

= 1,0V - 1,4V

Yes

No

Replace :

C183 and/or Z102

Replace :

C183 and/or Z102

Check :

R166, R151, C171

R152, R165, R168, C172, C170, C173,

C174, Z101

Check XMIC line to UEM

(D200)

Error still present

No

Replace :

Defective component

Defective D200*

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■ Charging failure troubleshooting

Figure 11:Charging troubleshooting 1

Phone is OFF - battery is

completely empty

(<=3,1VDC)

and no current from

charger when connected

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L100

VCHAR > 2,1VDC

Yes

Defective D200*

No

Check :

F100, L100, V100, C100, R200, System-c onnector.

Phone is ON or OFF - battery

nominal voltage (~3,6VDC)

and no current from

charger when connected

L100

VCHAR > 3,6VDC

No

Check :

F100, L100, V100, C100, R200, System-c onnector.

Yes

Defective

D200 or D400*

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■ Charging troubleshooting 2

Figure 12:Charging troubleshooting 2

Display info when

charger is connected :

"Not charging"

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Voltage on R206 towards

R206

D200 is ~0,8VDC

when power is connected.

(BSI must be 75K)

Yes

R207

Voltage (use scope) on R207

towards D200 is ~0,9VDC at

peak.

(BSI must be 47K)

Yes

R200

Voltage on R200 towards

D200 same as VBAT voltage

Yes

R200

Voltage rises slowly on

R200 towards D200 when

charger is connected.

Yes

No

Check :

X105, R202, R206, C240.

Check :

X105, R202, R207, C220.

Check :

R200, PWB.

Else defective D200*v

Check :

PWB.

Else defective D200*

Check :

PWB

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General RF Troubleshooting

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

• • RF measurements are done with a Spectrum Analyser and a high-frequency 500 ohm passive probe, for example HP54006A. (Note that when measuring with the 500 ohm probe the signal will be around 20 dB attenuated. The values in the following will have these 20 dB subtracted and represent the real value seen on the spectrum analyser).

Note that the testjig have some losses which must be taken into consideration wh en calibrating the test system.

• • LF (Low frequency) and DC measurements should be done with a 10:1 probe and an oscilloscope. The probe used in the following is 10MW/8pF passive probe. If using another probe then bear in mind that the voltages displayed may be sligh tly different.

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 repair jig when realigning the phone.

Most RF semiconductors are static discharge sensitive.

plied during repair (ground straps and ESD soldering irons). Mjoelner and Bifrost is moisture sensitive so parts must be pre-baked prior to soldering.

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

In the following both the name EGSM and GSM850 will be used for the lower band and both PCN and GSM1900 will be used for the upper band.

So ESD protection must be ap-

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■ RF key component placement

Figure 13:RF key components

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Table 1: RF component placement

N600 Mjoelner RF IC Z601 PCN RX SAW Z602 EGSM RX SAW Z603 EGSM TX SAW B600 26 MHz crystal G600 VCO ( 4.0 GHz UHF VCO ) N700 Power Amplifier (PA) Z700 RX/TX switch

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Refer to the picture below for measuring points at the UEM (D200).

Figure 14:Supply points at UEM (D200)

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Figure 15:Supply point at Mjoelner (N600)

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RH-60 Receiver Troubleshooting

■ General instructions for GSM850 RX troubleshooting

Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone Phoenix commands

RF Controls .Band GSM 850 RX .Continuous mode

Channel 190 .AGC 8 FEG ON + 46 dB

The setup should now look like this:

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Figure 16:GSM850 RF controls window

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Troubleshooting diagram for GSM850 receiver

Figure 17:GSM850 receiver troubleshootingt

Apply -55dBm

881.6 MHz offset 67.71kHz from generator to antenna conn

YES

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Oscilloscope at RX i/Q signal 588mVpp DC offset 1.35V Freq.67.71kHz

YES

GSM850 chain OK

Check RX/TX switch at RX850 Z700

-56dBm

YES

Spectrum analyzer GSM850 SAW filter Z602 output

-65dBm

YES

Spectrum analyzer check signal after inductors L602 and L603

-65DbM

NO NO

NO

Oscilloscope check VC1 and VC2 at Z700 Signal = 0V

NO

YES

Check RX/TX switch

Check SAW filter Z602

Check Inductor L603, L602

Check Mjoelner

YES

Oscilloscope VRX 2.7V Check Mjoelner serial interface

NO

Check

Baseband

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By measuring with an oscilloscope at RXIP or RXQP on a working GSM 850 receiver this picture should be seen.

Signal amplitude peak-peak 789 mV

DC offset 1.2 V

Figure 18:RX850 I/Q signal waveform

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■ General instructions for RH-60 GSM1900 RX troubleshooting

Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone

Phoenix commands

RF Controls .Band GSM 1900 RX .Continuous mode

Channel 661 .AGC 8 FEG ON + 46 dB

The setup should now look like this:

Figure 19:GSM1900 RF controls

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Troubleshooting diagram for GSM1900 receiver

Figure 20:GSM1900 receiver troubleshooting diagram

Apply -55dBm

1960.0 MHz offset 67.71kHz from generator to antenna conn

YES

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Oscilloscope at RX i/Q signal 588mVpp DC offset 1.35V Freq.67.71kHz

YES

GSM850 chain OK

Check RX/TX switch at RX1900 Z700

-56dBm

YES

Spectrum analyzer PCN SAW filter Z602 output

-65dBm

YES

Spectrum analyzer check signal after inductors L601 and L611

-65DbM

NO NO

NO

Oscilloscope check VC1 and VC2 at Z700 Signal = 0V

NO

YES

Check RX/TX switch

Check SAW filter Z601

Check Inductor L601, L611

Check Mjoelner

YES

Oscilloscope VRX 2.7V Check Mjoelner serial interface

NO

Check

Baseband

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By measuring with an oscilloscope at RXIP or RXQP on a working GSM 1900 receiver this picture should be seen.

Signal amplitude peak-peak 460 mV

DC offset 1.2 V

Figure 21: RX1900 I/Q signal waveform

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Measurement points in the receiver

Figure 22:RX measurements point at the RX/TX Switch - Z700

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Figure 23:Measurements points at the RX-Filters – Z601/Z602

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Figure 24:RX I/Q signals, baseband shielding can UEM (D200)

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■ RH-60 transmitter troubleshooting

Measurement points for the transmitter

Figure 25: TX measurement points in the PA ( N700 ) shielding can

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Power amp.

Figure 26:TX measurement point in Mjolner (N600) shielding can

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■ General instructions for RH-60 GSM TX troubleshooting

Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RF-cable should be connected to measurement equipment or to at least a 10-dB attenuator, otherwise the PA may be damaged.

Start Phoenix-Service-Software and establish a connection to the phone e.g. FBUS. Select File and Product: Gemini Select: Maintenance, Testing and RF Controls Band:GSM 850 Active Unit:TX Tx Power Level:5 Tx Data Type:Random Your screen should look like:

Figure 27::GSM850 RF controls window

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GSM850 TX output power

Measure the output power of the phone; it should be around 32.1 dBm. Remember the loss in the jig; around 0.3 dB.

Figure 28:VPCTRL_G & TXC

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■ General instructions for RH-60 GSM1900 TX troubleshooting

Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RF-cable should be connected to measurement equipment or to at least a 10-dB attenuator, otherwise the PA may be damaged.

Start Phoenix-Service-Software and establish a connection to the phone e.g. FBUS.

Phoenix commands

RF Controls .Band GSM 1900 RX .Continuous mode

Channel 661

Your screen should look like:

Figure 29:GSM1900 RF controls screen shot

GSM1900 TX output power

Measure the output power of the phone. It should be around 29.7 dBm. Remember the loss in the jig; around 0.7 dB.

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■ Tr oubleshooting diagram for GSM1900 TX

Figure 30:GSM1900 TX troubleshooting

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General Instructions for RH-59 GSM900 RX Troubleshooting

Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone Phoenix commands

RF Controls .Band GSM 900 RX .Continuous mode

Channel 37. AGC 8 FEG ON + 46 dB

The setup should now look like this:

Figure 31:GSM900 RF controls window

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Troubleshooting chart for GSM900 receiver

Figure 32:EGSM receiver troubleshooting chart

Apply -55dBm

942.4 MHz offset 67.71kHz from generator to antenna conn

YES

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Oscilloscope at RX i/Q signal 588mVpp DC offset 1.35V Freq.67.71kHz

YES

EGSM chain OK

Check RX/TX switch at RX900 Z700

-56dBm

YES

Spectrum analyzer EGSM SAW filter Z602 output

-65dBm

YES

Spectrum analyzer check signal after inductors L602 and L603

-65DbM

NO NO

NO

Oscilloscope check VC1 and VC2 at Z700 Signal = 0V

NO

YES

Check RX/TX switch

Check SAW filter Z602

Check Inductor L603, L602

Check Mjoelner

YES

Oscilloscope VRX 2.7V Check Mjoelner serial interface

NO

Check

Baseband

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By measuring with an oscilloscope at RXIP or RXQP on a working GSM 900 receiver this picture should be seen.

Signal amplitude peak-peak 789 mV DC offset 1.2 V

Figure 33:RX900 I/Q signal waveform

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Nokia Customer Care

■ General instructions for GSM1800 RX troubleshooting

Connect the phone to a PC with the module repair jig. Start Phoenix and establish connection to the phone Phoenix commands

RF Controls .Band GSM 1800 RX .Continuous mode

Channel 700 .AGC 8 FEG ON + 46 dB

The setup should now look like this:

Figure 34:GSM1800 RF control window

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Troubleshooting chart for GSM1800 receiver

Figure 35:GSM1800 receiver troubleshooting chart

Apply -55dBm

1842.8 MHz offset 67.71kHz from generator to antenna conn

YES

Nokia Customer Care

Oscilloscope at RX i/Q signal 588mVpp DC offset 1.35V Freq.67.71kHz

YES

EGSM chain OK

Check RX/TX switch at RX1800 Z700

-56dBm

YES

Spectrum analyzer EGSM SAW filter Z601 output

-65dBm

YES

Spectrum analyzer check signal after inductors L601 and L611

-65DbM

NO NO

NO

Oscilloscope check VC1 and VC2 at Z700 Signal = 0V

NO

YES

Check RX/TX switch

Check SAW filter Z602

Check Inductor L603, L602

Check Mjoelner

YES

Oscilloscope VRX 2.7V Check Mjoelner serial interface

NO

Check

Baseband

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XIP or RXQP on a working GSM 1800 receiver this picture should be seen.

Signal amplitude peak-peak 460 mV

DC offset 1.2 V

Figure 36:RX1800 I/Q signal waveform

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Measurement points in the receiver

Figure 37:RX measurements point for the RX/TX Switch - Z700

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Figure 38:Measurements points for the RX-Filters – Z601/Z602

Figure 39:RX I/Q Signals, baseband shielding can UEM (D200)

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■ RH-59 Transmitter troubleshooting

Measurement points for the transmitter

Figure 40: TX measuremnet points for the PA ( N700 ) shielding can

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Figure 41:TX measurement point for Mjolner (N600) shielding can

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■ General instructions for RH-59 GSM TX troubleshooting

Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RF-cable should be connected to measurement equipment or to at least a 10-dB attenuator, otherwise the PA may be damaged.

Start Phoenix-Service-Software and establish a connection to the phone e.g. FBUS. Select File and Product: RH-59 Select: Maintenance, Testing and RF Controls

Band: GSM 900

Active Unit: TX

Tx Power Level: 19

Tx Data Type: All 1

Your screen should look like:

Figure 42:GSM900 RF controls window

Measure the output power of the phone; it should be around 32.1 dBm. Remember the loss in the jig; around 0.3 dB.

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Nokia Customer Care

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Figure 43:VPCTRL_G and TXC signal

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■ PCN Transmitter general instructions for PCN TX troubleshooting

Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RF-cable should be connected to measurement equipment or to at least a 10-dB attenuator, otherwise the PA may be damaged.

Start Phoenix-Service-Software and establish a connection to the phone e.g. FBUS. Phoenix commands RF Controls .Band GSM 1800 RX .Continuous mode Channel 700 .AGC 14 FEG ON + 24 dB Your screen should look like:

Figure 44:RF controls window

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

Troubleshooting chart for PCN transmitter: refer to Figure 30 “GSM 1900 transmitter troubleshooting diagram on page 33.

Note! The word PCS in “start” block should be PCN if this block is used for RH59 troubleshooting.

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■ Synthesizer

There is only one PLL synthesizer generating Local Oscillator frequencies for both RX and TX in both bands ( PCN and EGSM). The VCO frequency is divided by 2 for PCN operation or by 4 for EGSM operation inside the Mjoelner IC.

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 reference oscillator is used as a reference frequency for the PLL synthesizer and as the system clock for BaseBand. The 26MHz signal is divided by 2 to achieve 13MHz inside the UPP IC (D400).

The 26 MHz signal from the VCXO can be measured by probing R425 (must be measured on the UPP side of R425 i.e. the end not 700mVpp. Frequency of this oscillator is adjusted by changing the AFC-register inside the Mjoelner IC. This is done via the Mjoelner serial interface.

Example Signal Measured at VCXO output (R425)

Figure 45: VCXO 26 MHz waveform

connected to C425). The level at this point is approx.

VCO

The VCO is an ASIC with all the frequency determining parts inside. In order to reduce the requirements of the tuning voltage and coverage of the VCO, the VCO

core is composed of four VCOs in parallel. This VCO circuit enables a very wide tun-ing range of 3.4 - 4.0 GHz .

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Troubleshooting diagram for PLL Synthesizer

Figure 46:PLL Troubleshooting diagram

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Phone fails after power on

If the phone stops working a short time after the power is turned ON, a possible reason for this could be that the 26MHz system clock signal is not getting to the UPP clock-input in BaseBand. In this case check the following:

1Turn on the phone and check 2VCXO Power supply (C620) = 2.7V 3VCXO output (R425 – end not If this is not the case check the reference crystal (B600) and Mjolner (N600) as well as R425,

R426, C425, C426.

connected to C425) is 26MHz and approx. 700mVpp

Measurement points for the VCXO

Figure 47:Figure 22: Measurement point for VCXO supply

Figure 48:Figure 23: Measurement point for VCXO output

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Measurement points at the PLL/VCO

Figure 49:Measurement point for PLL

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52 COMPANY CONFIDENTIAL ISSUE 1 09/2004

Nokia 2600 Service Manual 06 RH59_60 troubleshoot

Baseband Troubleshooting

■ Baseband test points

■ Tr oubleshooting diagrams

Phone is dead

■ Flash programming do not work

■ Power does not stay on or phone is jammed

■ Display information : "Contact Service"

■ The phone do not register to the network, or the phone cannot make a call

■ SIM related faults

Insert SIM card fault

SIM-Card rejected

■ Audio related faults 1: Earpiece and microphone

■ Audio related faults 2: Headset

■ Charging failure troubleshooting

■ Charging troubleshooting 2

General RF Troubleshooting

■ RF key component placement

RH-60 Receiver Troubleshooting

■ General instructions for GSM850 RX troubleshooting

Troubleshooting diagram for GSM850 receiver

■ General instructions for RH-60 GSM1900 RX troubleshooting

Phoenix commands

Troubleshooting diagram for GSM1900 receiver

Measurement points in the receiver

■ RH-60 transmitter troubleshooting

Measurement points for the transmitter

■ General instructions for RH-60 GSM TX troubleshooting

GSM850 TX output power

■ General instructions for RH-60 GSM1900 TX troubleshooting

Phoenix commands

GSM1900 TX output power

■ Tr oubleshooting diagram for GSM1900 TX

Troubleshooting chart for GSM900 receiver

■ General instructions for GSM1800 RX troubleshooting

Troubleshooting chart for GSM1800 receiver

Measurement points in the receiver

■ RH-59 Transmitter troubleshooting

Measurement points for the transmitter

■ General instructions for RH-59 GSM TX troubleshooting

■ PCN Transmitter general instructions for PCN TX troubleshooting

■ Synthesizer

26 MHz reference oscillator ( VCXO )

Troubleshooting diagram for PLL Synthesizer

Phone fails after power on

Measurement points for the VCXO

Measurement points at the PLL/VCO