Samsung STH-A225 Manual de usuario

SERVICE

TDMA MOBILE

TELEPHONE

STH-A225

ABC

GHI

DEF

JKL

MNO

PQRS

TUV

WXYZ

Manual

TDMA MOBILE TELEPHONE CONTENTS

1. Trouble Shooting

2. Electrical Parts List

3. Exploded Views and Parts List

4. Block Diagrams

5. PCB Diagrams

6. Circuit Description &

Circuit Diagrams

©Samsung Electronics Co.,Ltd. December. 2001

Pinted in Korea.

Code No.: GH68-01930A

BASIC.

ELECTRONICS

SAMSUNG Proprietary-Contents may change without notice

1-1

1. STH-A225 Trouble Shooting

1. Baseband Section

1-1. Program No Running

Need to check

Q204, U311

Replace dome S/W

Need to check

Q204, U311

Need to replace

Memory(U206)

Need to check neighbor part

Need to check OSC302,

U202 & neighbor part

Press END Key

ON_SW=H

VBAT>3.2V

VCTCXO_IN=14.4 MHz

32K_XIN=32.768 kHZ

Memory (U206)

control signal OK?

VCC=3.0V

V_VCTCXO=3.0V

RST=3.0V

IVCC=2.2V

BOOT=H

Program Running

VCC, ADD(0:21), DATA(0:15),

FLASH_CS, SRAM_CS, UBE,

MEMOEB, MEMWEB

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1-2

STH-A225 Trouble Shooting

1-2. Abnormal LCD display ,EL Baob Light, Vibrator & Speaker Operation

LCD module

Good

Replace LCD module

Speaker Output OK?

Need to check

CN101 & neighbor part

Need to check

CN101

START

LCD Control

Signal OK?

EL_EN=H

EL Back light

OK?

VCC, ADD(2), DATA(0:7),

DISPLAY_CS, RST

LCD Display Running

Send Command EL

enable(Test mode:176)

Need to check

CN101

VIBRATOR=H

Replace LCD module

Vibrator Run

OK?

LCD Display Running

EL Back lingt Running

Send Command Vibrator

enable(Test mode:180)

Need to check CN101

& neighbor part

SPK+,SPK-

Signal OK?

LCD EL Vibrator OK Send Command

Main Audio Receiver Path ON

(Test mode:031, 131, 134, 185)

Need to check U106 out pin5

2.8 V al control pin3 ‘H’

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1-3

STH-A225 Trouble Shooting

1-3. Abnormal Key, Mic, LED’S operation

Need to check CN102-1

& neighbor part

Need to check CN102-1,

Q102 & neighbor part

Press Keys

Key Dispaly

OK?

Key Display Good

Send Command Main Audio Path ON

(Test mode:031, 131, 136, 187)

Talking Voice at MIC+

Need to check

CN102-1 & neighbor part

LED Operation

OK?

Key Display Good

Mic Path Good

Send Command ALT_LED_ON

Send Command SVC_LED_ON

Send Command LED_ON

(Test mode:178)

Audio signal output

at Speaker?

GOOD

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1-4

STH-A225 Trouble Shooting

1-4. Abnormal Buzzer Operation

START

Need to check

U104 & AU101

Ringer Signal

OK?

Send Command Ringer Path ON

(Test mode:183)

Replace AU101

Buzzer Sound Output

OK?

Buzzer Operation

Good

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1-5

STH-A225 Trouble Shooting

1-5. Abnormal external Ear_Mic Jack operation

START

Need to check Q103,

U102 & neighbor parts

HS_SENSE=H

Hock Up Ear_Mic Phone in the Jack(U313)

Send Command MIC_BIAS_EN enable Send

Command AMP_EN enable

Audio set Path=HS

(Test mode:187, 185, 032)

Need to check Q103,

U102 & neighbor parts

SEND_END=H

Press Button on the Ear-Jack

Ear_Mic phone

Operation Good

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1-6

STH-A225 Trouble Shooting

2. RF Section

2-1. Call processing and Online Test

DONE

START

Normal SVC?

Check RX path

Set up Call OK?

Check TX path

Measure SINAD/BER

Good?

Check RX path

Measure

Tx Power Good?

Check TX path

SAMSUNG Proprietary-Contents may change without notice

1-7

STH-A225 Trouble Shooting

2-2. Receiver Section (Offline test)

Need to check

U209, U208, U207

Need to check

F306

U301_8=-54dBm

Need to check

F304 & neighbor parts

RF_BAND=L, RX_BAT=H

PLL_ON=H, PON_LC=H

VCTCXO_PC=H, IF_ON=H

PON_VRF3=H

set up 8920B basestation for RX test

Set Base station RX Lev=-50 dBm

Send Command RX path ON

Send Command channel selecton

(Test mode:031)

START

V_LNA_CELL=H

U208_1=H

U207_1=H

Need to check

U301 & neighbor parts

F304 input=-34dBm

U304_45=-35dBm

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1-8

STH-A225 Trouble Shooting

AMPSTDMA

Replace U304

Replace

F302

Need to check OSC301,

neighbor parts & U304_1,2,3

Need to check

U207 & neighbor parts

YRF loal check

U304_48 Lev=-5dBm

Freq=adjusted freq?

U304_41 Lev=-19dBm

Freq=130.05MHz

U304_34 Lev=-26dBm

Freq=130.05MHz

NNeed to check

U304, L303, C308, L301, C307

U304_37 Lev=4dBm

Freq=450kHz

NReplace F301 or

Need to check R302, R304, C301

U304_25 Lev=-2dBm

Freq=450kHz

MODE

U304_40, 42=3.0V

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