Ericsson A2618s Bedienungsanleitung

Trouble Shooting Guide, Advanced

4/00021-3/FEA 209 544/25 C

Ericsson Mobile Communications AB

Approved according to 1776-1/FEA 209 544

Trouble Shooting Guide, Advanced

ApplicableforA2618s by Toko ([email protected])

Contents

1 Explanations .........................................................................................................................2

2 On/Off, Enter Test Program...............................................................................................6

3 EPROM...............................................................................................................................10

4 ADC-Calibration (Voltage-Calibration) ..........................................................................12

5 BDATA-Calibration...........................................................................................................15

6 Current Calibration...........................................................................................................16

7 Network Problems..............................................................................................................20

8 LO Fault..............................................................................................................................30

9 VCXO..................................................................................................................................32

10 RSSI.....................................................................................................................................34

11 Phase and Frequency Error..............................................................................................36

12 Transient Spectrum (Spectrum due to switching)...........................................................38

13 Modulation Spectrum Switched Mode (Spectrum due to Modulation) .......................42

14 Burst Timing (Power Time Template) .............................................................................50

15 Calibration Intermediate Power.......................................................................................52

16 Calibration Power Level....................................................................................................53

17 Audio ...................................................................................................................................56

18 Keyboard.............................................................................................................................65

19 Display.................................................................................................................................67

20 Buzzer..................................................................................................................................69

21 Illumination.........................................................................................................................70

22 Top Indicator......................................................................................................................71

23 SIM-Fault (“Insert Card”)................................................................................................72

24 Self-Test...............................................................................................................................75

25 ADC-Values ........................................................................................................................77

26 Revision History .................................................................................................................78

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1 Explanations

1.1 Conditions

All measurements described in the trouble shooting instruction are performed in EFRA.

If the faulty phone is a swap unit with no possibility to start the phone in signal-mode,

it still is possible to make a call by using the ”Go to call processing” under the Misc menu in

EFRA.

It is not needed to flash the phone to enter the test program,

the SW is a combined Signal and Test Software.

The Flashing is performed with the EMMA II application.

Some of the faults can occur in tests without test program, e.g. Go/No Go -tests.

In these cases you have to start the phone with test program in EFRA before starting to

trouble shoot.

The classification of the components and a possible demand of current-, BData-, ADC- and

radio calibration when changing a component are mentioned in separate documents.

There are four different calibrations: current-, BData-, ADC- and radio-calibrations.

Current-, BData- and ADC-calibration are performed in the trouble shooting part of EFRA,

while radio calibration can be found under the icon “Calibrate”.

Some replaces of component demands all three calibrations, other only need one or two of the

calibrations.

1.2 Component placement reference

For component placement see doc.1078-2/FEA 209 544/25

1.3 Service Test Menu

Code to enter Service Test Menu, > * < < * < *

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1.4 Abbreviations

B: Crystal.

C: Capacitor.

D: Digital circuit.

H: Buzzer, LED, and pads for display.

J: Connector.

L: Coil.

N: Analogue circuit, power amplifier at some units.

R: Resistor.

S: Keyboard pads.

U: Balun, component that converts a balanced signals to unbalance or vices versa.

V: Transistor, diode.

X: Contact surface on the circuit board.

Z: Filter.

DCIO: DC voltage through the system connector for charging.

GND: Ground.

RTC: Real Time Clock, the clock that keeps track of time.

SIMCONCLK: Signal from the processor used for communication to SIM, clock-signal.

SIMCONDAT: Signal from the processor used for communication to SIM, data-signal.

SIMCONRST: Signal from the processor used for communication to SIM, reset-signal.

SIM VCC: Feed voltage for SIM, 5.0 ± 0.10 VDC.

VBATT: Battery voltage, 3.70 ± 0.5 VDC.

VPPFLASH: Voltage to erase and program the memory. 12.0 ± 0.60 VDC

VCORE: DC voltage for the processor 2.4 ± 0.10 VDC.

VCORE DSP: DC voltage for the DSP 1.8 ± 0.10 VDC.

VDIG: DC voltage for the processor and memory, 2.75 ± 0.10 VDC.

VLCD: DC voltage for the display that controls the contrast, the voltage is generated in

the display-assembly.

VHOM: DC voltage for the radio part except the synthesiser, 3.8 ± 0.20 VDC.

VRAD: DC voltage for the radio part, 3.8 ± 0.20 VDC.

V380B: DC voltage for the radio part, 3.8 ± 0.20 VDC.

VRTC: DC voltage for the real time clock, 2.35 ± 0.15 VDC.

VVCO: DC voltage for the synthesiser, 3.8 ± 0.10 VDC.

I2C: Communications-standard for two-way communication using only 2 wires.

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1.5 External connectors

External units are connected to the transceiver by means of an 11-pin connector on the bottom

of the phone.

The pin numbering is starting from the right when looking on the system connector with the

front up.

Pin Signal Function

1 DCIO DC+ pole for charging phone battery and external

accessory powering.

2 GND Digital GND and DC return.

3 VPPFLASH Flash memory Vpp /Service.

4 GND Audio signal GND, 0 V reference.

5 CFMS_PHFS Accessory Control From Mobile Station serial (ACB)

communication/ Portable Hands Free Sense.

6 CTMS Accessory Control To Mobile Station serial (ACB)

communication.

7 DFMS Data From Mobile Station, serial bus communication.

8 DTMS Data To Mobile Station, serial bus communication/

External accessory Power on

9 CTS_ON Mobile station Clear To Send/ ON REQuest

10 AFMS/RTS Audio from Mobile station/ Ready To Send

11 ATMS Audio to Mobile station

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1.6 Pin placing

Single diode (PIN diode) Electrolytic capacitor. Double diode or single

transistor

Five pin circuit (usually volt-

age regulator). Double transistor. N392

Eight pin circuit. N200 N400

Crystal N300

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2 On/Off, Enter Test Program

2.1 Introduction

If the phone does not start in the radio calibration or trouble shooting part of EFRA,

despite an approved flash programming, go to section 2.2.

2.2 The phone does not start in the test program

Attach a dummy battery and press the On/Off button. Check the top led and the current

consumption.

If the top led starts lightning and the phone consumes 15 – 30 mA, it usually is without fault.

Check your equipment.

Following things are necessary for the phone to start in the test program:

Correct battery voltage.

The current limitation must be set high enough on both outputs of the power supply, 2 A.

The following signal must be at the system connector of the phone: CTMS, CFMS,

VPPFLASH and GND.

An Hardlock connected and installed.

Follow the Start-up instructions in EFRA.

If the fault really is electrical, open the phone and make a visual check of the board.

Make sure there is not any liquid damage or any mechanical damaged at the system

connector.

No further action should be taken for a liquid damaged unit, send it on according to the

local company directives.

Power up the board and start it using the On/Off button.

Measure the voltages VDIG, 2.75 ± 0.10 VDC (C723) and VCORE.DSP, 1.8 ± 0.10 VDC

(C722).

If the voltages are correct, check the 13 MHz clock (B320) and MCLK (N300, pin 52) with

an oscilloscope, the value of the measurements should be 500 mV p-p.

If not, change B320, if the fault still remains the fault probably is due to N700.

Also check D602 (pin 5 and 6) they should be 2.75 ± 0.10 VDC.

If not, check the soldering and resold if necessary.

If the fault still remains the fault probably is due to N700.

Check VBOOST, 4.1 ± 0.10 VDC and VRAD, 3.8 ± 0.20 VDC.

If the measured values are incorrect use the circuit diagram.

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2.3 The phone can not be programmed

Makesurethat:

The battery connector not is mechanically or liquid damaged.

The system connector not is dirty, mechanically or liquid damaged.

Replace it if necessary.

No further action should be taken for a liquid damaged unit, send it on according to the

local company directives.

Attach a “dummy battery”. If the phone consumes current immediately, the fault usually

depends on a short circuit of VBATT.

Start the phone with the On/Off button and check the current consumption.

If the phone consumes no current at all when the button is pressed, there probably is

liquid damage. Open the phone and check for liquid damage.

Check the keypads for dirt, mechanically or liquid damage and clean them it if necessary.

If the phone consume more than 30 mA, go to section 2.4.3.

If the phone does not start, try to program it.

If the phone does not start in the flash programmer, go to section 2.4.1.

If the phone can be programmed, but does not start afterwards or is troublesome in the flash

programmer, go to section 2.4.2.

If the phone starts after programming, there is probably no fault, but to eliminate the

possibility of intermittent faults check for bad soldering on the card.

2.4 Measuring at a powered circuit board

2.4.1 Does not start in the flash programmer

Make sure the system connector pads not are mechanically or liquid damaged.

No further action should be taken for liquid a damaged unit, send it on according to the

local company directives.

Attach the board to the fixture and connect the battery voltage and the programming interface.

Check VPPFLASH at X800 pin 3.

The voltage will not be switched on until you have started the phone in the EMMA II-flash,

after the message “TURN ON THE PHONE TO START”.

If the measurements are incorrect the fault is probably found in the test equipment.

Measure the voltages VDIG and VCORE.DSP.

If VDIG is to low, the fault is due to N700.

If VCORE.DSP is too low, change N720, C722 and R732.

If the fault still remains, it is probably due to N700.

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If the voltages are correct, check the 13 MHz clock (B320) and MCLK (N300, pin 52 or at

L340 at the side close to N300) with an oscilloscope, the value of the measurements should be

500 mV p-p.

If not, change B320.

If the fault still remains, it is probably due to N700.

Also check D602 (pin 5 and 6) they should be, 2.75 ± 0.10 VDC.

If not, check the soldering and resold if necessary.

If the fault still remains, it is probably due to N700.

Check VBOOST 4.1 ± 0.10 VDC and VRAD, 3.8 ± 0.20 VDC.

If the measured values are incorrect use the circuit diagram.

2.4.2 Can be programmed, but does not start afterwards or is troublesome

in the flash programmer

Open the phone and check for liquid damage.

No further action should be taken for a liquid damaged unit, send it on according to the

local company directives.

Make sure the pads of the system connector not are mechanically or liquid damaged.

Attach the board to the fixture. Power up the board.

Measure the voltages VDIG and VCORE.DSP.

If the voltages are correct, check the 13 MHz clock (B320) and MCLK (N300, pin 52 or at

L340 at the side close to N300) with an oscilloscope, the value of the measurements should be

500mVptp.

If not, change B320, if the f still remains, it is probably due to N700.

Also check D602 (pin 5 and 6) they should be, 2.75 ± 0.10 VDC.

If not, check the soldering and resold if necessary.

If the fault still remains, it is probably due to N700.

Check VBOOST ,4.1 ± 0.10 VDC and VRAD,3.8 ± 0.20 VDC.

If the measured values are incorrect use the circuit diagram.

2.4.3 Consumes more than 30 mA

Open the phone and check for liquid damage.

No further action should be taken for a liquid damaged unit, send it on according to the

local company directives.

Make sure the pads of the system connector not are mechanically or liquid damaged.

Attach the board to the fixture. Power up the board.

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Measure the voltages VDIG and VCORE.DSP.

If the voltages are correct, check the 13 MHz clock (B320) and MCLK (N300, pin 52 or at

L340 at the side close to N300) with an oscilloscope, the value of the measurements should be

500 mV p-p.

If not, change B320, if the fault still remains, it is probably due to N700.

Also check D602 (pin 5 and 6) they should be, 2.75 ± 0.10 VDC

If not, check the soldering and resold if necessary.

If the fault still remains, it is probably due to N700.

Check VBOOST 4.1 ± 0.10 VDC and VRAD, 3.8 ± 0.20 VDC..

If the measured values are incorrect use the circuit diagram.

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3 EEPROM

3.1 Write to EEPROM

Large amount of data is stored in the RAM memory of the phone during the radio calibration

in EFRA.

This information is stored permanently in a 32 kB*8 large EEPROM after interpolation.

This is done after calibration, write Local Table to EEPROM.

ThedatatransferisdoneseriallyatanI

2C-bus, Inter IC. The I2C-bus consists off two lines,

I2CDAT for data and I2CCLK for clocking.

The figure below shows a schematic over the data transfer.

DISPLAY

I2CCLK

I2CDAT

N700

D 600 D 602

EEPROM

Fig.3.1

3.2 How to find the fault

There is a possibility, in the trouble shooting part of EFRA, to test the communication and a

limited part of the function in the self-test.

The functionality test that is done is the processor writing and reading at a few addresses.

If the self-test shows ”Check EEPROM Failed”, the phone is faulty, but the self-test does not

display all faults, so there is a possibility for the self test not to detect the fault.

Open the phone and check for liquid damage.

No further action should be taken for a liquid damaged unit, send it on according to the

local company directives.

Check R801, R802.

Make sure there is not a short circuit against ground at I2CCLK or I2CDAT.

Power up the board and check VDIG.

The fault is usually due to D602.

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