Nokia 2600c, RM-340, RM-341 Service Manual

RM-340; RM-341 Baseband Troubleshooting Instructions

General baseband troubleshooting

Key components

Power supply test points

Phone cannot be powered on (I)

Context

This means that the phone does not use any current at all when the supply is connected and/or power key is pressed. It is assumed that the voltage supplied is 3.6VDC. The UEMCLite will prevent any functionality at battery/supply levels below 2.9VDC.

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Troubleshooting flow

RM-340; RM-341

Baseband Troubleshooting Instructions

Figure 9 Troubleshooting when phone cannot be powered on

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RM-340; RM-341 Baseband Troubleshooting Instructions

Phone cannot be powered on (II)

Context

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

If the MCU doesn’t service the watchdog register within the UEMCLite, the operations watchdog will run out after approximately 32 seconds. Unfortunately, the service routine can not be measured.

Troubleshooting flow

Figure 10 Troubleshooting when phone does not stay on or phone is jammed

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Baseband Troubleshooting Instructions

Phone cannot be flashed

Context

The flash programming can be done via the pads on the PWB (J2060). If failed, then follow up the trouble shooting flow chart.

In case of flash failure in the FLALI station, swap the phone and send it back to the care program for further analysis. Possible failures could be short-circuit of balls under µBGAs (UEMCLite, UPP4M, FLASH), or 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 circuit in the control and address lines of MCU (UPP8M) and the memory (flash).

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RM-340; RM-341 Baseband Troubleshooting Instructions

Troubleshooting flow

Figure 11 Flash programming fault

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Baseband Troubleshooting Instructions

Easy flash programming does not work

Context

The flash programming can be done via the easy flash connector. If failed, then follow up the trouble shooting below.

It is not possible to verify if there is a short circuit in control and address lines of MCU (UPP8M) and memory (flash) because BGA package is used in RM-340/341.

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RM-340; RM-341 Baseband Troubleshooting Instructions

Troubleshooting flow

Figure 12 Easy flash programming fault

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Baseband Troubleshooting Instructions

Display shows "Contact Service"

Troubleshooting flow

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

They are 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.

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RM-340; RM-341 Baseband Troubleshooting Instructions

Figure 13 Troubleshooting when the "Contact Service" message is seen

The phone does not register to the networks, or the phone cannot make a call

Context

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 are 'buried' in one or more of the inner layers of the PWB.

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

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Troubleshooting flow

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Baseband Troubleshooting Instructions

Figure 14 No registering or call

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RM-340; RM-341 Baseband Troubleshooting Instructions

SIM related faults

Insert SIM card fault

Troubleshooting flow

The hardware of the SIM interface from UEMCLite (D2200) to the SIM connector (X2700) 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, where after it will display ”Insert SIM card”.

Figure 15 Insert SIM card fault

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Baseband Troubleshooting Instructions

Figure 16 Signal diagram

SIM card rejected

The error ”SIM card rejected” means that the ATR 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.

Figure 17 Signal diagram

User interface

Blank display

Context

The display does not show any information at all. If there is only main or sub display blank, the problem mostly exists in individual display. Replace related display first. For main and sub display blank, refer to troubleshooting flow below.

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RM-340; RM-341 Baseband Troubleshooting Instructions

Troubleshooting flow

Corrupted display

Context

The display contains missing or fading segments, or color presentation is incorrect.

Troubleshooting flow

Dead keys

Context

One or more keys has no function.

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Baseband Troubleshooting Instructions

Troubleshooting flow

No backlight for display or/and keys

Context

There are 3 kinds of statuses: No backlight for both display and keys; No backlight for only display; No backlight for only keys.

Troubleshooting flow

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Baseband Troubleshooting Instructions

Figure 19 4-pole jack plug for audio accessory

Table 4 Connector for External Audio Accessories

Pin Signal name Direction Description

5 PLUGDET Input Terminal internal

connection, plug

detection 4 HS EAR L Output Audio output 3 HS EAR R Output Audio output 2 HS MIC Input Multiplexed

microphone audio and

control data 1 HS GND - Ground contact

Check microphone using "Hp microphone in Ext speaker out" loop

Steps

1. Connect phone with Phoenix.

2. Open “audio test” window from “Testing -> Audio test”, as shown in above.

3. Select “Hp microphone in Ext speaker out”

4. Select "Acc. Detection" as "Off".

5. Select “Loop” as “On”

6. Input sound at microphone port, for example 94dB SPL 1kHz.

Figure Phoenix audio test window

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RM-340; RM-341 Baseband Troubleshooting Instructions

Earpiece fault

Troubleshooting flow

Figure 24 Earpiece fault flow chart

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IHF/ringing tone fault

Troubleshooting flow

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Baseband Troubleshooting Instructions

Figure 25 IHF/ringing tone fault flow chart

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RM-340; RM-341 Baseband Troubleshooting Instructions

Microphone fault

Troubleshooting flow

Figure 26 Microphone fault flow chart

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Headset earpiece fault

Troubleshooting flow

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Baseband Troubleshooting Instructions

Figure 27 Headset earpiece fault flow chart

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RM-340; RM-341 Baseband Troubleshooting Instructions

Headset microphone fault

Troubleshooting flow

Figure 28 Headset microphone fault flow chart

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RM-340; RM-341 RF Troubleshooting Instructions

General RF troubleshooting

Most RF semiconductors are static discharge sensitive

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 Analyzer and a high-frequency 500 ohm passive probe, for

example HP54006A. (Note that when measuring with the 500ohm probe the signal will be around 20dB attenuated. The values in the following will have these 20dB subtracted and represent the real value seen on the spectrum analyzer). Note that the testing have some losses which must be taken into consideration when 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 10Mohm/8pF passive probe. If using another probe then bear in mind that the voltages displayed may be slightly 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.

So ESD protection must be applied during repair (ground straps and ESD soldering irons). Mjoelner and Bifrost are 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.

RF key components

Figure 29 RF key components on PWB

N7600 PMB3258 RF IC N7700 FEM (PA and antenna switch) Z7602 EGSM 850/900 RX SAW filter Z7600 DCS 1800/PCS1900 RX SAW filter

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RF Troubleshooting Instructions

Z7603 EGSM 850/900 TX filter Z7604 DCS 1800/PCS1900 TX filter B7600 26 MHz crystal N6000 BT & FM IC Z6000 BT SAW filter

Refer to the picture below for measuring points at the UEM (D2200).

RM-340; RM-341

Figure 30 Supply points at UEM (D2200)

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Figure 31 Supply point at RF IC (N7600)

Figure 32 Supply point at BT & FM IC (N6000)

Auto tuning

This phone can be tuned automatically.

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RF Troubleshooting Instructions

Autotune is designed to align the phone's RF part easier and faster. It performs calibrations, tunings and measurements of RX and TX. The results are displayed and logged in a result file, if initiated.

Hardware set up

Hardware requirements for auto tuning:

• PC (Windows 2000/NT) with GPIB card

• Power supply

• Product specific module jig

• Cables: 3 (alt.1) RF cable, 1 GPIB cable and DAU-9S

• Signal analyser (TX), signal generator (RX) and RF-splitter or one device including all.

Phoenix preparations

Copy the two phone specific ini-files, for example specific folder, for example

\Phoenix\products\RM-13\

rm_13_tunings.ini

.

and

autotune_RM-13.ini,

to a phone

Auto tuning procedure

1 Make sure the phone (in the jig) is connected to the equipment. Else, some menus will not be shown in

Phoenix.

2 The first time you are using automatic tuning on this phone model, on this computer, you will have to

Set loss

3 To go to autotune, select 4 If you need more assistance, please refer to the Phoenix

for cables and jigs.

Tuning (Alt-U)

>

Auto-Tune (Alt-A)

from the menu.

Help

.

RM-340 receiver

General instructions for GSM900 RX troubleshooting

Steps

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

2. Start

3. Select File and Scan product.

4. Wait a while for the PC to read the information from the phone.

5. Select Testing and RF Controls.

6. Set the parameters as follows:

Phoenix

i Active Unit: RX ii Band: GSM 900 iii Operation Mode: Continuous mode iv RX/TX Channel 37 v AGC: 8: FEG_ON + DTOS_ON+BB_6=Vgain_36

and establish a connection to the phone with the data cable e.g. FBUS.

Results

The setup should now look like this:

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Troubleshooting diagram for GSM900 receiver

Troubleshooting flow

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RF Troubleshooting Instructions

Figure 34 GSM900 receiver troubleshooting

Results

By measuring with an oscilloscope at RXIP or RXQP on a working GSM900 receiver this picture should be seen. Signal amplitude peak-peak 108mV. DC offset 1.0V.

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RM-340; RM-341 RF Troubleshooting Instructions

Figure 35 900 RX I/Q signal waveform

General instructions for GSM 1800 RX troubleshooting

Steps

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

2. Start

3. Select File and Scan product.

4. Wait a while for the PC to read the information from the phone.

5. Select Testing and RF Controls.

6. Set the parameters as follows:

Phoenix

i Active Unit: RX ii Band: GSM 1800 iii Operation Mode: Continuous mode iv RX/TX Channel 700 v AGC: 8: FEG_ON + DTOS_ON+BB_6=Vgain_36

and establish a connection to the phone with the data cable e.g. FBUS.

Results

The setup should now look like this:

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Troubleshooting diagram for GSM1800 receiver

Troubleshooting flow

Figure 37 GSM1800 receiver troubleshooting

Results

By measuring with an oscilloscope at RXIP or RXQP on a working GSM1800 receiver this picture should be seen. Signal amplitude peak-peak 114mV. DC offset 1.0V.

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RF Troubleshooting Instructions

Figure 38 1800 RX I/Q signal waveform

Measurement points in the receiver

Figure 39 RX measurements point of the control voltages to FEM N7700

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RM-340; RM-341 RF Troubleshooting Instructions

Figure 40 Measurement points at the RX SAW Filters – Z7600/Z7602

Figure 41 RX I/Q signals

RM-340 transmitter

General instructions for GSM 900 TX troubleshooting

Steps

1. Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RF-cable should be

connected to an attenuator at least 10dB before connected to the measurement equipment, otherwise the PA may be damaged.

2. Start

3. Select File and Scan product.

4. Wait a while for the PC to read the information from the phone.

5. Select Testing and RF Controls.

6. Set the parameters as follows:

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Phoenix

i Band: GSM 900

and establish a connection to the phone with the data cable e.g. FBUS.

RM-340; RM-341 RF Troubleshooting Instructions

Troubleshooting diagram for GSM900 transmitter

Troubleshooting flow

Figure 43 GSM900 tarnsmitter troubleshooting

GSM900 TX output power

Measure the output power of the phone; it should be about 32.5dBm. Remember the cable loss is about

0.3dB.

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RF Troubleshooting Instructions

Figure 44 TX I/O signal

Figure 45 VC1, VC3 signals

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Figure 46 TXP signal

Figure 47 TXC signals at PCL5

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RF Troubleshooting Instructions

Figure 48 TXC signals at PCL19

General instructions for GSM1800 TX troubleshooting

Steps

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

2. Start

3. Select File and Scan product.

4. Wait a while for the PC to read the information from the phone.

5. Select Testing and RF Controls.

6. Set the parameters as follows:

Phoenix

i Band: GSM 1800 ii Active Unit: TX iii TX Power Level: 0 iv TX Data Type: Random

and establish a connection to the phone with the data cable e.g. FBUS.

Results

The setup should now look like this:

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Figure 49 GSM 1800 RF controls window

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Troubleshooting diagram for GSM1800 transmitter

Troubleshooting flow

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RF Troubleshooting Instructions

Figure 50 GSM1800 transmitter troubleshooting

GSM1800 TX output power

Measure the output power of the phone; it should be about 30.5dBm. Remember the cable loss is about

0.5dB.

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Figure 51 TX I/O signal

Figure 52 VC1, VC2, VC3 signals

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Figure 53 TXP signal

Figure 54 TXC signals at PCL0

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Figure 55 TXC signals at PCL15

RM-341 receiver

General instructions for GSM 850 RX troubleshooting

Steps

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

2. Start

3. Select File and Scan product.

4. Wait a while for the PC to read the information from the phone.

5. Select Testing and RF Controls.

6. Set the parameters as follows:

Phoenix

i Active Unit: RX ii Band: GSM 850 iii Operation Mode: Continuous mode iv RX/TX Channel 190 v AGC: 8: FEG_ON + DTOS_ON+BB_6=Vgain_36

and establish a connection to the phone with the data cable e.g. FBUS.

Results

The setup should now look like this:

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RF Troubleshooting Instructions

Figure 56 GSM850 RF controls window

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Troubleshooting diagram for GSM850 receiver

Troubleshooting flow

Figure 57 GSM850 receiver troubleshooting

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RF Troubleshooting Instructions

Results

By measuring with an oscilloscope at RXIP or RXQP on a working GSM850 receiver this picture should be seen. Signal amplitude 114mVp-p. DC offset 1.0V.

Figure 58 850 RX I/Q signal waveform

General instructions for GSM1900 RX troubleshooting

Steps

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

2. Start Phoenix and establish a connection to the phone with the data cable e.g. FBUS.

3. Select File and Scan product.

4. Wait a while for the PC to read the information from the phone.

5. Select Testing and RF Controls.

6. Set the parameters as follows: i Active Unit: RX ii Band: GSM 1900 iii Operation Mode: Continuous mode iv RX/TX Channel 661 v AGC: 8: FEG_ON + DTOS_ON+BB_6=Vgain_36

Results

The setup should now look like this:

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Troubleshooting diagram for GSM1900 receiver

Troubleshooting flow

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RF Troubleshooting Instructions

Figure 60 GSM1900 receiver troubleshooting

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Results

By measuring with an oscilloscope at RXIP or RXQP on a working GSM1900 receiver this picture should be seen. Signal amplitude 108 mVp-p. DC offset 1.0V.

Figure 61 1900 RX I/Q signal waveform

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Measurement points in the receiver

RM-340; RM-341

RF Troubleshooting Instructions

Figure 62 RX measurements point of the control voltages to FEM N7700

Figure 63 Measurement points at the RX SAW Filters – Z7600/Z7602

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RM-340; RM-341 RF Troubleshooting Instructions

Figure 64 RX I/Q signals

RM-341 transmitter

General instructions for GSM 850 TX troubleshooting

Steps

1. Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RF-cable should be

connected to an attenuator at least 10dB before connected to the measurement equipment, otherwise the PA may be damaged.

2. Start

3. Select File and Scan product.

4. Wait a while for the PC to read the information from the phone.

5. Select Testing and RF Controls.

6. Set the parameters as follows:

Phoenix

i Band: GSM 850 ii Active Unit: TX iii TX Power Level: 5 iv TX Data Type: Random

and establish a connection to the phone with the data cable e.g. FBUS.

Results

The setup should now look like this:

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Troubleshooting diagram for GSM850 transmitter

Troubleshooting flow

Figure 66 GSM850 transmitter troubleshooting

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RF Troubleshooting Instructions

GSM850 TX output power

Measure the output power of the phone; it should be about 32.5 dBm. Remember the cable loss is about 0.3 dB.

Figure 67 TX I/O signal

Figure 68 VC1, VC3 signal

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Figure 69 TXP signal

Figure 70 TXC signals at PCL5

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RF Troubleshooting Instructions

Figure 71 TXC signals at PCL19

General instructions for GSM1900 TX troubleshooting

Steps

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

2. Start

3. Select File and Scan product.

4. Wait a while for the PC to read the information from the phone.

5. Select Testing and RF Controls.

6. Set the parameters as follows:

Phoenix

i Band: GSM 1900 ii Active Unit: TX iii TX Power Level: 0 iv TX Data Type: Random

and establish a connection to the phone with the data cable e.g. FBUS.

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Troubleshooting diagram for GSM1900 transmitter

Troubleshooting flow

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RF Troubleshooting Instructions

Figure 73 GSM1900 transmitter troubleshooting

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GSM1900 TX output power

Measure the output power of the phone; it should be about 29.1dBm. Remember the cable loss is about

0.5dB.

Figure 74 TX I/O signal

Figure 75 VC1, VC2, VC3 signals

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RF Troubleshooting Instructions

Figure 76 TXP signal

Figure 77 TXC signals at PCL0

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Figure 78 TXC signals at PCL15

Synthesizer troubleshooting

Introduction

26 MHz Reference Oscillator (VCXO)

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.

The 26MHz oscillator is located near the Mjoelner IC. (N7600). The coarse frequency for this oscillator is set by an external crystal (B7600). The reference oscillator is used as a reference frequency for the PLL synthesizer and as the system clock for the Baseband. The 26MHz signal is divided by 2 to achieve 13MHz inside the UPP IC (D2800).

The 26MHz signal from the VCXO can be measured by probing R2900. The level at this point is approx. 770mVpp. Frequency of this oscillator is adjusted by changing the AFC-register inside the UEM IC. Example Signal Measured at VCXO output (R2900).

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RF Troubleshooting Instructions

Figure 79 VCXO 26 MHz waveform

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Troubleshooting diagram for PLL synthesizer

Figure 80 PLL Troubleshooting diagram

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Measurement points at the VCXO

Figure 81 Measurement point for VCXO

FM radio and bluetooth troubleshooting

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RF Troubleshooting Instructions

Measurement settings

Steps

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

2. Start Phoenix and establish a connection to the phone with the data cable e.g. FBUS.

3. Phoenix settings shall be as follows:

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Troubleshooting diagram for FM radio

Troubleshooting flow

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RF Troubleshooting Instructions

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Figure 83 FM circuit troubleshooting diagram

RM-340; RM-341 RF Troubleshooting Instructions

Bluetooth and FM radio test points

Figure 84 Bluetooth and FM radio test points

Figure 85 XAUDIO output signal

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Bluetooth circuit troubleshooting diagram

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Antenna troubleshooting

Antenna troubleshooting diagram

Troubleshooting flow

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RF Troubleshooting Instructions

Figure 89 Antenna troubleshooting

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RM-340; RM-341 Camera Module Troubleshooting

Troubleshooting flow

Note: Make sure that the phone has the latest software before continuing.

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Camera baseband HW troubleshooting

Troubleshooting flow

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Camera Module Troubleshooting

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RM-340; RM-341 Camera Module Troubleshooting

Camera viewfinder troubleshooting

Troubleshooting flow

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Bad camera image quality troubleshooting

Troubleshooting flow

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Camera Module Troubleshooting

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RM-340; RM-341 System Module

System module block diagram

The main board consists of a radio frequency part and a baseband part. The User Interface parts are situated at the UI side, which is on the opposite side of the engine board. The 2CP is the engine module of the mobile device, and the 2CQ is the UI module of module of the mobile device.

Figure 106 Module block diagram

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RM-340; RM-341 System Module

Energy management

Filter components

The master of EM control is UEMCLite and with SW it has the main control of the system voltages and operating modes. The power distribution diagram is presented in the illustration below.

Figure 107 Power connection diagram

All connectors going to the “outside world” have filter components, ESD protection and EMC reduction. The Digital/Data lines on SIM have special dedicated filter ASIP. The below figure show the SIM filtering.

Figure 108 SIM filtering

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System Module

The Audio circuit: Earpiece, IHF, internal microphone and external speaker are filtered with discrete components (common mode reduction coils, Varistors, caps and resistors), where as the external microphone uses differential mode mic. ASIP

The 16 UEMECLite BB & RF regulators are specified to have a decoupling cap of 1 µF ±20%.

Modes of operation

BB4.0 LiteV2 base band has five different functional modes, which are defined in UEMCLite specification:

• No supply: In NO_SUPPLY mode, the phone has no supply voltage. This mode is due to disconnection of

main battery or low battery voltage level in battery. Phone is exiting from NO_SUPPLY mode when sufficient battery voltage level is detected. Battery voltage can rise either by connecting a new battery with VBAT > VMSTR+ or by connecting charger and charging the battery above VMSTR+.

• Acting Dead: If the phone is off when the charger is connected, the phone is powered on but enters a state

called ”Acting Dead”. To the user, the phone acts as if it was switched off. A battery charging alert is given and/or a battery charging indication on the display is shown to acknowledge the user that the battery is being charged.

• Active: In the Active mode the phone is in normal operation, scanning for channels, listening to a base

station, transmitting and processing information. There are several sub-states in the active mode depending on if the phone is in burst reception, burst transmission, if DSP is working etc.

In Active mode the RF regulators are controlled by SW writing into UEMCLite’s registers wanted settings: VR regulators can be disabled, enabled or forced into low quiescent current mode. VR2 is always enabled in Active mode for system clock chain supply

• Sleep: In sleep mode VCTCXO is shut down and 32 kHz sleep clock oscillator is used as reference clock for

the base band.

• Charging: Charging can be performed in any operating mode. The battery type / size is indicated by a

resistor inside the battery pack. The resistor value corresponds to a specific battery capacity. This capacity value is related to the battery technology as different capacity values are achieved by using different battery technology. The battery voltage, temperature, size and current are measured by the UEMCLite and controlled by the charging software running in the UPP. The charging control circuitry (CHACON) inside the UEMCLite controls the charging current delivered from the charger to the battery. The battery voltage rise is limited by turning the UEMCLite switch off when the battery voltage has reached 4.2 V. Charging current is monitored by measuring the voltage drop across a 220 mW resistor. The PWM output doesn’t exist any more from UEMCLite to the bottom connector

Voltage limits

Table 6 Voltage limits

Parameter Description Value/V

Vmstr+ Master reset threshold (rising) 2.1 ±0.1 Vmstr- Master reset threshold (falling) 1.9 ±0.1 Vcoff+ Hardware cutoff (rising) 3.1 ±0.1 Vcoff- Hardware cutoff (falling) 2.8 ±0.1 SW shutdown SW cutoff limit (> regulator drop-

out limit) MIN!

3.2 V

Audio function description

The basic audio structure and communication between HW-audio modules and the audio ASIC's is illustrated in the block diagram below.

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RM-340; RM-341 System Module

Figure 109 Audio block diagram

UEMcLite supports three microphone inputs and two outputs. The inputs can be used for internal, headset or handsfree microphones. The microphone signals from different sources are connected to separate inputs at the UEMcLite ASIC. The inputs and outputs are all differential.

Three inputs (MIC1, MIC2) and two outputs (EAR, HF) are used in the phone. MIC1P/MIC1N inputs are used for the internal microphone, using single-ended biasing circuitry. EARP/EARN

outputs from UEMcLite are used for hand-portable mode. Uplink external audio (headset as well as carkit) is connected to MIC2P/MIC2N, while downlink audio is

provided via the HF outputs from UEMcLite. A special situation exists since the carkit can be used with two different microphones: either the phone's internal microphone (MIC1-inputs) or an external microphone that connects to the carkit. In these cases UEMcLite is capable of switching between MIC1 and MIC2.

The audio control is taken care of by UEMcLite, which contains the MCU and audio codec. UPP contains DSP blocks, and handling and processing of the audio signals.

Input and output selection, and gain control is performed inside UEMcLite. DTMF-tones and other audio tones are generated and encoded by UPP and transmitted to UEMcLite for decoding.

External audio connector

The system connector, containing a 4-pole Jack plug, gains the access to the external audio interface. The Jack plug, which is integrated in the system connector, contains a mechanical switch, which is used to detect the connection of the accessories. The configuration for the 4-pole Jack-plug is shown in the following figure.

Issue 1 COMPANY CONFIDENTIAL Page 6 –9

RM-340; RM-341

System Module

Figure 110 4-pole jack plug for audio accessory

Table 7 Connector for External Audio Accessories

Pin Signal name Direction Description

5 PLUGDET Input Terminal internal

connection, plug

detection 4 HS EAR L Output Audio output 3 HS EAR R Output Audio output 2 HS MIC Input Multiplexed

microphone audio and

control data 1 HS GND - Ground contact

HALL sensor

The HALL sensor is used to recognize the position of the flap. The HALL sensor incorporates advanced chopper-stabilization techniques to provide accurate and stable

magnetic switch points. The circuit design provides an internally controlled clocking mechanism to cycle power to the HALL element and analog signal processing circuits. This serves to place the high currentconsuming portions of the circuit into the sleep mode. Periodically the device is awakened by this internal logic and the magnetic flux from the HALL element is evaluated against the predefined thresholds. If the flux density is above or below the BOP/BRP thresholds, the output transistor is driven to change states accordingly. While in the sleep cycle, the output transistor is latched in its previous state.

The output transistor of the SH248CSP is latched on at the presence of a sufficiently strong south or north magnetic field facing the marked side of the package. The output is latched off in the absence of a magnetic field.

The output of hall sensor is sent to GENIO24 of UPP. Baseband knows the status of the hall sensor that represents the phone position (folded or not).

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RM-340; RM-341 System Module

Figure 111 HALL sensor

Issue 1 COMPANY CONFIDENTIAL Page 6 –11

RM-340; RM-341

System Module

Figure 112 Keyboard schematics

SIM interface

The UEMCLite contains the SIM interface logic level shifting. The SIM interface can be programmed to support 3V and 1.8V SIMs. SIM supply voltage is selected by with register in the UEMCLite. It is only allowed to change the SIM supply voltage when the SIM IF is powered down.

The SIM power up/down sequence is generated in the UEMCLite. This means that the UEMCLite generates the RST signal to the SIM. In addition, the SIMCardDet signal is connected to UEMCLite. The detection is taken from the BSI signal, which detects the removal of the battery. The monitoring of the BSI signal is done by a comparator inside UEMCLite. The comparator offset is such that the comparator outputs do not alter state as long as the battery is connected. The threshold voltage is calculated from the battery size specifications.

The SIM interface is powered up when the SIMCardDet signal indicates ”card in”. This signal is derived from the BSI signal.

Page 6 –16 COMPANY CONFIDENTIAL Issue 1

PWB outline

RM-340; RM-341

System Module

RF description

Figure 115 PWB top side component placement

Figure 116 PWB bottom side component placement

Frequency band, power and multi-slot class

The requirement leads to the specification in the table below:

Table 14 Frequency bands and TX power class

System Frequency band TX power class

GSM900 Tx: 880 – 915 MHz 4 (33dBm)

Page 6 –20 COMPANY CONFIDENTIAL Issue 1

Nokia 2600c, RM-340, RM-341 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

General baseband troubleshooting

Key components

Power supply test points

Phone cannot be powered on (I)

Phone cannot be powered on (II)

Phone cannot be flashed

Easy flash programming does not work

Display shows "Contact Service"

The phone does not register to the networks, or the phone cannot make a call

SIM related faults

Insert SIM card fault

SIM card rejected

User interface

Blank display

Corrupted display

Dead keys

No backlight for display or/and keys

Check microphone using "Hp microphone in Ext speaker out" loop

Earpiece fault

IHF/ringing tone fault

Microphone fault

Headset earpiece fault

Headset microphone fault

General RF troubleshooting

General RF troubleshooting

RF key components

Auto tuning

RM-340 receiver

General instructions for GSM900 RX troubleshooting

Troubleshooting diagram for GSM900 receiver

General instructions for GSM 1800 RX troubleshooting

Troubleshooting diagram for GSM1800 receiver

Measurement points in the receiver

RM-340 transmitter

General instructions for GSM 900 TX troubleshooting

Troubleshooting diagram for GSM900 transmitter

GSM900 TX output power

General instructions for GSM1800 TX troubleshooting

Troubleshooting diagram for GSM1800 transmitter

GSM1800 TX output power

RM-341 receiver

General instructions for GSM 850 RX troubleshooting

Troubleshooting diagram for GSM850 receiver

General instructions for GSM1900 RX troubleshooting

Troubleshooting diagram for GSM1900 receiver

Measurement points in the receiver

RM-341 transmitter

General instructions for GSM 850 TX troubleshooting

Troubleshooting diagram for GSM850 transmitter

GSM850 TX output power

General instructions for GSM1900 TX troubleshooting

Troubleshooting diagram for GSM1900 transmitter

GSM1900 TX output power

Synthesizer troubleshooting

Introduction

Troubleshooting diagram for PLL synthesizer

Measurement points at the VCXO

FM radio and bluetooth troubleshooting

Measurement settings

Troubleshooting diagram for FM radio

Bluetooth and FM radio test points

Antenna troubleshooting

Antenna troubleshooting diagram

Camera baseband HW troubleshooting

Camera viewfinder troubleshooting

Bad camera image quality troubleshooting

System module block diagram

Energy management

Modes of operation

Voltage limits

Audio function description

External audio connector

HALL sensor

SIM interface

PWB outline

RF description