GXT25_final.pdf

CONFIDENTIAL

GX-T25

SERVICE MANUAL

No. SX425TQG2521B

DIGITAL MOBILE PHONE

MODEL

GX-T25

(INTERNAL MODEL NAME: TQG2521B)

For Taiwan

• In the interests of user-safety the set should be restored to its

original condition and only parts identical to those specified

should be used.

• Caution

Risk of explosion if battery is replaced by an incorrect type,

dispose of used batteries according to the instruction.

CONTENTS

SERVICING CONCERNS

CHAPTER 4. DIAGRAMS

[1] Block diagram................................................4-1

CHAPTER 1. GENERAL DESCRIPTION

[1] Specifications.................................................1-1

[2] Names of parts...............................................1-2

[3] Quick Start Guide...........................................1-3

[4] Optional Accessories.....................................1-3

CHAPTER 5. SCHEMATIC DIAGRAM AND

WIRING SIDE OF P.W.BOARD

[1] Notes on schematic diagram.........................5-1

[2] Types of transistor and LED..........................5-1

[3] Waveforms of circuit......................................5-2

[4] Schematic diagram/

Wiring side of P.W.Board.............................5-4

CHAPTER 2. ADJUSTMENTS,

PERFORMANCE CHECK, AND

FIRMWARE UPGRADE

[1] SHARP Programme Support Tool (SPST)........2-1

[2] Test points.................................................... 2-40

[3] Troubleshooting........................................... 2-43

CHAPTER 6. OTHERS

[1] Function table of IC .......................................6-1

[2] Function table of Display.............................6-26

CHAPTER 3. DISASSEMBLY AND REASSEMBLY

[1] Servicing Concerns........................................3-1

[2] Disassembly and reassembly........................3-4

Parts Guide

Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for

maintaining the safety and performance of the set.

SHARP CORPORATION

This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

GX-T25

CONFIDENTIAL

SERVICING CONCERNS

1. When requested, back up user’s handset data using SPST (SHARP Programme Support Tool). Otherwise, before servicing, warn the user that

data in the memory may be lost during repairs.

2. Upgrade the firmware to the latest version using SPST before returning the handset to the customer.

3. After repairs, inspect the handset (phone) according to the following flowchart.

Repairs are completed.

(Fixed parts have been checked for proper operation.)

Check IMEI NO./Operator code (Destination)/

Firmware version by Identity function of SPST.

Inspect each device using performance check

adjustment function of SPST.

Carry out RF performance check with SPST.

All completed.

4. When storing or transporting a PWB, put it into a conductive bag or wrap it in aluminum foil. (C-MOS IC may be damaged by electrostatic

charges.)

5. Do not leave fingerprints, etc. on ornamental parts including a cabinet, especially clear windows for main and external displays. Wear fingerstalls

to avoid this.

Also, ensure not to leave fingerprints on the surface of main and external display panels.

6. To prevent oxidation which causes connection problems, do not touch any terminals on the electric board, microphone, vibrator, earpiece and

speaker.

When handling these parts, wear fingerstalls. Should you touch these parts, clean them with a soft dry cloth.

Always wear fingerstalls when handling a shield case on the electric board. Otherwise oxidation may occur causing handset performance deterio-

ration.

7. The FPC is a precision device. Handle it carefully to prevent any damages.

8. Do not expose the moisture sensor to liquids.

If the sheet gets wet, red ink runs. In this case, replace the sheet with a new one.

Be careful about your perspiration.

9. Before you disassemble or reassemble handset, make sure to remove the Li-Ion battery.

10.Be sufficiently careful with static electricity of integrated circuits and other circuits. Wear static electricity prevention bands whilst servicing.

Phone

GX-T25

Market

Service Manual

CONFIDENTIAL

GX-T25

PRECAUTIONS FOR USING LEAD-FREE SOLDER

Employing lead-free solder

This model employs lead-free solder.

This is indicated by the “LF” symbol printed on the PWB and in the service manual.

The suffix letter indicates the alloy type of the solder.

Example:

Indicates lead-free solder of tin, silver and copper.

Using lead-free solder

When repairing a PWB with the “LF” symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder may

result in cold soldered joints and damage to printed patterns.)

As the melting point of lead-free solder is approximately 40ºC higher than tin/lead alloy solder, it is recommended that a

dedicated bit is used, and that the iron temperature is adjusted accordingly.

Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wettability (flow), to prevent damage to the land

of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time.

Remove the bit as soon as a good flow is achieved.

The high content of tin in lead free solder will cause premature corrosion of the bit.

To reduce wear on the bit, reduce the temperature or turn off the iron when it is not required.

Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their

characteristics, making good soldering more difficult.

It will be necessary to clean and replace bits more often when using lead-free solder. To reduce bit wear, care should be

taken to clean the bit thoroughly after each use.

GX-T25

CONFIDENTIAL

CHAPTER 1. GENERAL DESCRIPTION

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE

REFER TO THE OPERATION MANUAL.

[1] Specifications

General:

Tri - band (GSM 900 MHz/DCS 1800 MHz/

PCS 1900MHz)

GPRS-enabled

WAP, MMS, SMS

Sound: 40-polyphonic ring melodies

Mobile light: 1 colours

External DC

supply voltage: 5.2 V

Battery: 3.7 V, 780 mAh, Li-Ion

Standby time: Up to 210 hours

Talk time:

Dimensions

(folded, exclud-

ing the aerial)

(H x W x D): 92 x 46 x 23.5 mm

Weight:

Up to 230 minutes

90 g

Others:

Side key

Infrared port 1.2 L/P (maximum distance 20 cm)

Connector for AC charger and data cable

Standard hands free connector (ø2.5)

Battery operating

temperature: 0°C - 40°C

Main display: Display dimensions: 2.0 inch

Resolution: 240 x 320 pixels

LCD display: TFT 262,144 colours with backlight

LCD back light: LED back light white colour LEDs

External display: Resolution: 72 x 12 pixels

LCD display: STN B/W LCD with back light

Battery running time depends on the battery and SIM card as well as

the network conditions and usage.

Specifications for this model are subject to change without prior

notice.

Camera:

C-MOS 310K pixels built-in camera

Zoom: Wide and zoom mode

[Supported 20 (when image size is

160 x 120 pixels) x zoom]

Lens: F2.8, f = 3.5 mm

2004AplixCorporation.Allrightsreserved.

JBlend and all JBlend-based trademarks

and logos are trademarks or registered

trademarks of Aplix Corporation in Japan

and other countries.

CP8 PATENT

Information contained in this manual is the property of

FarEasTone and Sharp.

FarEasTone and Sharp reserve the right to change product

specifications without prior notice.

FarEasTone and Sharp reserve the right to change

information contained in this manual without prior notice.

Mascot Capsule is a registered trademark of HI

Corporation

ThisproductislicensedundertheMPEG-4VisualPatent

PortfolioLicenseforthepersonalandnon-commercialuseof

aconsumertoencodevideoincompliancewiththeMPEG-4

VideoStandard(“MPEG-4Video”)and/ordecodeMPEG-4

Videothatwasencodedbyaconsumerengagedina

personalandnon-commercialactivityand/orwasobtained

fromalicensedvideoprovider.Nolicenseisgrantedor

impliedforanyotheruse.Additionalinformationmaybe

obtainedfromMPEGLA.Seehttp://www.mpegla.com.

LicensedbyInterDigitalTechnologyCorporationunderone

ormoreofthefollowingUnitedStatesPatentsand/ortheir

domesticorforeigncounterpartsandotherpatents

pending,includingU.S.Patents:4,675,863:4,779,262:

4,785,450&4,811,420.

ThisproductislicensedundertheMPEG-4SystemsPatent

PortfolioLicenseforencodingincompliancewiththeMPEG-

4SystemsStandard,exceptthatanadditionallicenseand

paymentofroyaltiesarenecessaryforencodingin

connectionwithdatastoredorreplicatedinphysicalmedia

whichispaidforonatitlebytitlebasisand/ordatawhichis

paid for on a title by title basisandistransmittedtoanend

userforpermanentstorageand/oruse.Suchadditional

licensemaybeobtainedfromMPEGLA,LLC.Seehttp://

www.mpegla.comforadditionaldetails.

T9TextInputislicensedunderoneormoreofthefollowing:

U.S.Pat.Nos.5,818,437,5,953,541,5,187,480,5,945,928,

and 6,011,554; Australian Pat. No. 727539; Canadian Pat.

No. 1,331,057; United KingdomPat. No. 2238414B; Hong

KongStandardPat.No.HK0940329;RepublicofSingapore

Pat.No.51383;Euro.Pat.No.0842463(96927260.8)DE/

DK,FI,FR,IT,NL,PT.ES,SE,GB;RepublicofKoreaPat.

Nos.KR201211B1andKR226206B1;andadditional

patentsarependingworldwide.

Bluetooth is a trademark of the Bluetooth SIG, Inc.

The Bluetooth word mark and logos are owned by the

Bluetooth SIG, Inc. and any use of such marks by Sharp is

under license. Other trademarks and trade names are

those of their respective owners.

1 – 1

Phone

GX-T25

Market

Service Manual

CONFIDENTIAL

GX-T25

[2] Names of parts

1. Earpiece

2. Navigation Keys (Arrow Keys):

Moves cursor to select

menu items, etc.

Up/Down arrow keys: Displays Phonebook

entries in stand-by mode.

and indicate in this

manual these keys.

Left arrow key: Displays the list of Java

Gallery in stand-by mode.

indicates in this manual

this key.

Right arrow key: Displays Saved Pictures in

stand-by mode.

indicates in this manual

this key.

3. Left Soft Key: Executes the function at the

bottom left of the screen.

4. Send Key: Makes or accepts calls,

views the call logs in

stand-by mode.

5. Centre Key: Displays Main menu in

stand-by mode and

executes functions.

Long press this key to start

the digital camera in stand-

by mode.

6. Voicemail Key: Long press this key to

connect to the Voicemail

centre automatically.

(Depends on the SIM card.)

13.# Key:

Switches symbol screens,

and long press

launches

"Profiles" screen.

Long press this key on the

text entry screen to shift

text input method between

multi-tap and T9 mode.

Press , then during

stand-by to activate Voice

Recorder.

14.Microphone

15.Self-Portrait Mirror: For taking a self-portrait.

16.Camera

17.Speaker

18.Mobile Light: Used as an auxiliary light in

digital camera/video

camera mode, as a battery

charge indicator, or

notification for incoming

calls, data/fax calls or

messages.

19.External Display

20.Handsfree Kit Connector

21.External Connector:

Used to connect either the

charger or USB data cable.

22.RF Connector

23.Battery Cover

24.Built-in Aerial: Warning:Do not cover the

hinge area of the phone

with your hand when in use

as this may interfere with

the performance of the

built-in aerial.

25.Side-Up/Side-Down Keys:

7. * /Shift Key:

Switches character case

among four modes:Abc,

ABC, 123 and abc.

8. Main Display

9. Right Soft Key: Executes the function at the

bottom right of the screen.

10.End/Power Key: Ends a call, turns power on/

off.

11.Browser Key: Launches the browser in

stand-by mode.

Moves cursor to select

menu items, adjusts

earpiece volume, etc.

Long press this key during

stand-by to turn the mobile

light on or off.

12.Keypad

26.Infrared Port: Sends and receives data via

infrared.

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