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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RM-340; RM-341

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

RM-340; RM-341

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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RM-340; RM-341

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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Earpiece fault

Troubleshooting flow

Figure 24 Earpiece fault flow chart

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IHF/ringing tone fault

Troubleshooting flow

RM-340; RM-341

Baseband Troubleshooting Instructions

Figure 25 IHF/ringing tone fault flow chart

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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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