Sony Ericsson K750 Bedienungsanleitung

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical

Applicable for K750

Contents

General...........................................................................................2

1.1.

Service functions in the software....................................2

1.2.

Misuse and other no warranty issues.............................3

Appearance Problems....................................................................6

Network/Signal Problems ...............................................................9

On/Off Problems...........................................................................10

Audio Problems ............................................................................12

Key Problems ...............................................................................16

Display Problems..........................................................................19

Illumination Problems ...................................................................21

Alert Problems..............................................................................23

SIM Problems...............................................................................25

Charging/Capacity Problems........................................................26

Camera Problems.........................................................................27

Data Communication Problems....................................................30

Hands-Free Problems...................................................................32

Software Problems .......................................................................32

Revision History............................................................................33

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 2(33)

1 General

This document outlines the mechanical repairs that should be made in an attempt to fix the common failures that are seen in the field. To gain a

complete understanding of how to test and repair a specific failure, this document should be used in conjunction with the Test Instructions,

Mechanical and the Working Instructions, Mechanical.

1.1. Service functions in the software

The service menu will be accessed with the following key combination. Use the joystick.

⇒*⇐⇐*⇐*

They are as follows:

Service info

Service tests

Text labels

The phones software has a built in service functionality that allows you to test some of the phones functions. (See point 2 above) It looks like this:

Main display

LED/illumination

Keyboard

Speaker

Earphone

Microphone

Vibrator

Camera

Flash LED

Memory Stick

Real time clock

FM radio (You need a headset to test)

Total call time

NOTE: Different names may occur depending on language setting and customization.

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 3(33)

1.2. Misuse and other no warranty issues

Misuse is not covered by warranty. This chapter will explain what’s not covered by warranty. Phones that have been exposed to misuse will not

be covered by warranty.

This means: if it is possible to repair the phone, the customer will have to pay for the repair. SEMC will not allow any of these phones to be

claimed into WCMS. Some local perspectives may interfere with this. Please reference to local directives.

1.1.1 Action

Make a general visual inspection for misuse.

Below are some examples of what is not covered by warranty.

Front window broken due

to misuse. LCD cracked due to

drop. Clear scratches Mark after drop Corrosion components on

the PCB.

Corrosion components on the PCB. Corrosion components on the PCB. SIM reader damaged by liquid. System connector damaged by liquid

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 4(33)

Components around system

connector damaged by liquid System connector pad(s) damaged

by liquid

1.1.2 Liquid damage sticker

In the phone there is placed a sticker that can give you a hint to see if the phone is damage by liquid or not. This sticker is located near the SIM

reader (Fig. 1.2.1) and it is possible to see it without disassemble the phone.

Fig. 1.2.1

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 5(33)

On the pictures below you will see the different between a sticker that has been in contact with liquid (Fig. 1.2.3) and with one that hasn’t (Fig.

1.2.2).

1.1.3 Action

Make a general visual inspection for misuse, corrosion or oxidation from liquid damage. No further action should be taken for a liquid damaged

phone. Handle the unit according to local directives.

This sticker is ok This sticker is not ok

The white sticker that has been in contact with

liquid turns into a red or pink sticker. In this case

you should check the phone for liquid damage

(See point 1.1.1).

Note: There must be clear marks after liquid on the

PCB before rejecting the phone for repair.

Fig. 1.2.2 Fig. 1.2.3

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 6(33)

2 Appearance Problems

Problem Area Items to Check Repair Action Reference Image

Appearance Visually inspect the cosmetic quality of all

user viewable surfaces

Front

System connector

Joystick button

Frame assembly

IRDA window

Memory card rubber lid

Antenna cover assembly

Battery cover assembly

Co-brand inlay

• If dirty – Clean parts as necessary.

• If unacceptably scratched or damaged –

Replace damage parts as necessary.

NOTE: Misuse is not covered by warranty.

Refer to chapter 1.2

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 7(33)

Problem Area Items to Check Repair Action Reference Image

Visually inspect all keys

Keyboard

On/Off key

Music key

Volume key

Camera key

• If dirty – Clean parts as necessary.

• If unacceptably scratched or damaged –

Replace damaged parts as necessary.

NOTE: Misuse is not covered by warranty.

Refer to chapter 1.2

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 8(33)

Problem Area Items to Check Repair Action Reference Image

Visually inspect for improper gap between

seams • Reassemble or replace damaged parts as

necessary.

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 9(33)

3 Network/Signal Problems

Problem Area Items to Check Repair Action Reference Image

Before proceeding !Perform a flash upgrade.

Visually inspect SIM holder • If dirty or oxidized – Clean it.

• If damaged – Send to an electrical repair

location.

No Signal or Poor

Signal

Visually inspect antenna contact pads • If dirty or oxidized – Clean the pads and

replace the antenna assembly.

Trouble Shooting Guide, Mechanical

4/000 21-1/FEA 209 544/94 C

Sony Ericsson Mobile Communications AB 10(33)

Problem Area Items to Check Repair Action Reference Image

Visually inspect antenna • If dirty or oxidized – Replace it.

• If damaged – Replace it.

If the issue has not been resolved !• Handle the unit according to local

directives.

4 On/Off Problems

Problem Area Items to Check Repair Action Reference Image

Check whether the phone vibrates 10 to 15

seconds after pressing the power key and

whether the keypad illuminates

• If activation of the vibrator and keypad are

detected, refer to the “Display Problems”

section

Power On problems

Before proceeding !• Perform a flash upgrade.

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