Sony-Ericsson T200 Service Manual

Trouble Shooting Guide, Electrical

Trouble Shooting Guide T200, Electrical

by Toko ([e-mail])

Contents

Explanations....................................................................................................................2

1

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

2 Network Problems ..........................................................................................................3

3 On/Off Problem...............................................................................................................4

4 Display / Illumination Problems ....................................................................................5

5 Charging Problems .........................................................................................................6

6 LED Problems .................................................................................................................7

7 Alert Problems ................................................................................................................8

8 Microphone Problem......................................................................................................9

9 Real time clock problem............................................................................................... 10

10 SIM Card recognition Problem ................................................................................... 10

11 Revision history............................................................................................................. 12

4/00021-2/FEA 209 544/71 B

 Sony Ericsson Mobile Communications AB

Approved according to 000 21-LXE 107 42/1

Trouble Shooting Guide, Electrical

1 Explanations

For Component replacement refer to doc. Component List.
The Go / No Go test has to be performed with a mounted phone.

1.1 Service functions in the software

In the software of the phone there is a built in service function that allows testing some of the
functions of the phone.

They are as follows:

• Service info

• Service settings

• Service tests

• Text labels

To use the function press the following combination, using the naviation button and the
keyboard: > * < < * < *

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Trouble Shooting Guide, Electrical

2 Network Problems

• Check the Antenna Units flex film is properly fitted and undamaged.

(Fig2.1) Also check the connectors on the antenna unit.

Replace the Antenna unit if it’s necessary.
Also check the PCB pads, if necessary clean them.

• Check the External Antenna Connector (Fig2.2) if it’s incorrectly soldered,

mechanically damaged, dirty, deformed or oxidized. Measure the resistance through the

Antenna Connector; it should be less than 1Ω.

Replace Antenna Connector if it’s necessary.

If fault still remains, send the unit to higher level according to local company directives.

Fig. 2.1 Fig. 2.2 Fig. 2.2

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Trouble Shooting Guide, Electrical

3 On/Off Problem

• Check that the telephone battery connector if it is incorrectly soldered,

mechanically damaged, dirty, deformed or oxidized (Fig. 3.1).
Replace battery Connector if necessary.

• Make sure that the battery is working properly.

Replace battery if necessary.

• Make sure that the keypad is not damaged.

Replace keypad if necessary.

• Make sure that the system connector is not damaged

Replace system connector if necessary.

If fault still remains, send the unit to higher level according to local company directives

Fig. 3.1

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