Samsung STH-N271 Service Manual

SERVICE

SINGLE BAND Mobile Cellular Phone

STH-N271

Manual

SINGLE BAND Mobile Cellular Phone CONTENTS

1. Specification

2. Trouble Shooting

3. Test Procedure

4. Function of All Active Devices

5. Frequency Synthesizer Circuit and Spurious Radiation Suppression Circuit

6. Easy NAM Programming

7. Electrical Parts List

8. Exploded Views and Parts List

9. Block Diagram

10. PCB Diagrams

11. Circuit Description &

Circuit Diagrams

©Samsung Electronics Co.,Ltd. August. 2001

Pinted in Korea. Code No.: GH68-02202A BASIC.

ELECTRONICS

1. STH-N271 SPECIFICATION (REF TIA/EIA/IS-137-A-1)

1. Confirmation of Power level (Class IV)

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1-1

Level Analog(dBm) Digital(dBm)

0,1,2 26.5 26.5 323 23 420 20 516 16 612 12 78 8 8- 3 9- -2 10 - -7

2. Channel Numbering and Frequency

System Channel Number Transmitter Receiver

(Not used) 990 CH 824.01 MHz 869.01 MHz

A” 991 CH ~ 1023 CH 824.04 ~ 825.00 MHz 869.04 ~ 870.00 MHz A 1 CH ~ 333 CH 825.03 ~ 834.99 MHz 870.03 ~ 879.99 MHz

B 334 CH ~ 666 CH 835.02 ~ 844.98 MHz 880.02 ~ 889.98 MHz A’ 667 CH ~ 716 CH 845.01 ~ 846.48 MHz 890.01 ~891.48 MHz B’ 717 CH ~ 799 CH 846.51 ~ 848.97 MHz 891.51 ~ 893.97 MHz

#. Transmitter : 1 < N < 799 : 0.03N + 825.00 MHz

990 < N < 1023 : 0.03(N-1023) + 825.00 MHz

#. Receiver : 1 < N < 799 : 0.03N + 870.00 MHz

990 < N < 1023 : 0.03(N-1023) + 870.00 MHz

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STH-N271 Specification

3. General

Item Analog mode Digital mode

Frequency Range

Transmitter 824.04 ~ 848.97 MHz Receiver 869.04 ~ 893.97 MHz

Channel Space 30 kHz Numbers of Channel 1024 Duplexer Space 45 MHz

Frequency Stability ± 2.5 ppm ±200 Hz Operating Temperature - 30 oC ~ +60oC

Size and Weight

Including 900 mAh battery 108 (H) x 42 (W) x 17.2 (D) : 93 g Including 1200 mAh battery 108 (H) x 42 (W) x 18.7 (D) : 100 g

Operating Time Standby time

Including 900 mAh battery 35 ~ 45 hr 130 ~ 230 hr Including 1200 mAh battery 45 ~ 55 hr 190 ~ 300 hr

Talk time

Including 900 mAh battery 60 ~ 90 min 2 ~ 3 hr Including 1200 mAh battery 80 ~ 120 min 2.5 ~ 4.5 hr

Need to check

Q107, Q106

Replace dome S/W

Need to check

Q107, Q106

Need to replace

Memory(U202)

Need to check neighbor part

Need to check OSC320,

Y201 & neighbor part

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2-1

2. STH-N271 Trouble Shooting

1. Baseband Section

1-1. Program No Running

Press END Key

ON_SW=H

VBAT>3.2V

VCTCXO_IN=14.4MHz

32K_XIN=32.768 kHZ

Memory (U202)

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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STH-N271

Trouble Shooting

Need to check

U103 & neighbor part

Need to check

R126, C148

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

START

LCD Control

Signal OK?

EL_EN=H

Need to check U104

& neighbor Part

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

R216, U205, D202

VIBRATOR=H

Need to check CN202

Vibrator Run

OK?

LCD Display Running EL Back lingt Running

Send Command Vibrator

enable(Test mode:180)

Need to check SPK101

& neighbor part

REC20+,- Signal

OK?

LCD EL Vibrator OK Send Command

Main Audio Receiver Path ON

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

Good

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2-3

STH-N271

Trouble Shooting

Need to check Dome

S/W & U103

Need to check MIC101

& neighbor part

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

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

D210, D211, Q204, Q206

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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2-4

STH-N271

Trouble Shooting

1-4. Abnormal Buzzer Operation

START

Need to check

U204, D201, CN202

Ringer Signal

OK?

Send Command Ringer Path ON

(Test mode:183)

Replace CN202

Buzzer Sound Output

OK?

Buzzer Operation

Good

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2-5

STH-N271

Trouble Shooting

1-5. Abnormal external Ear_Mic Jack operation

START

Need to check Q101,

CN101 & neighbor parts

HEADSET_SENSE=H

Hock Up Ear_Mic Phone in the Jack(CN101) Send Command MIC_BIAS_EN enable Send

Command AMP_EN enable

Audio set Path=HS

(Test mode:187)

Need to check Q102,

CN101 & neighbor parts

SEND_END=H

Press Button on the Ear-Jack

Ear_Mic phone

Operation Good

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2-6

STH-N271

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

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2-7

STH-N271

Trouble Shooting

Need to check

U302

2-2. Receiver Section (Offline test)

F305 input=-55dBm

Need to check

F305

Need to check

U105, U106, U107

F305 output=-49dBm

Need to check

F306

U301_8=-53dBm

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:134, 131)

START

V_LNA_CELL=H

U107_1=H U105_1=H

Need to check

U301 & neighbor parts

F304 input=-33dBm

U304_45=-33dBm

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2-8

STH-N271

Trouble Shooting

AMPSTDMA

Replace U304

Replace

F302

Need to check OSC301,

neighbor parts & U304_1,2,3

Need to check

U105 & neighbor parts

RF loal check

U304_48 Lev=-6dBm

Freq=adjusted freq?

U304_41 Lev=-23dBm

Freq=130.05MHz

U304_34 Lev=-33dBm

Freq=130.05MHz

Need to check

U304, L303, C308, L301, C307

U304_37 Lev=-1dBm

Freq=450kHz

Replace F301 or

Need to check R302, R304, C301

U304_25 Lev=-7dBm

Freq=450kHz

MODE

U304_40, 42=3.0V

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STH-N271

Trouble Shooting

Replace U304

Case TDMA mode:

setup basestation for RX test

Amplitude:-50dBm

U304_9, 19, 11, 12

measure I/Q

Quarature wave

Need to check U304 &

Quad LC Tank circuit

(L310, C328, C330,

C329, R320)

PON_LD=H

Case AMPS mode:

setup basestation for RX test

Audio Freq gen : 1004Hz

FM deviation : 2.9kHz

Y Y

U304_16 DEMOD (sinusoidal wave)

Vp-p=24mV

Freq=1004Hz

Need to check U304 &

R327, R323, C353, C107

U101_52 DEMOD (sinusoidal wave)

MAX Vp-p=1.4V

Freq=1004Hz

Replace U203

U101_40 BBCLK=

6.2208MHz or 4.96NHz or

5.12MHz

Replace U203

U101_32RX_CLK=

BBCLK/2 or

BBCLK/8

Replace U203

U101_31 RX_SYNC=

BBCLK/32 or

BBCLK/128

Replace U203

U101_31 RX_DATA=

serial data

DONE

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2-10

STH-N271

Trouble Shooting

Replace U203

2-3.Transmitter Section (Offline test)

U101_40 BBCLK=

6.2208MHz or 4.096MHz or5.12MHz

U101_34 TX_CLK=

BBCLK/32 or BBCLK/8

U101_33 TX_SYNC=

BBCLK/512 or BBCLK/128

U101_33 TX_DATA=

serial data

RF_BAND=L, TX_BAT=H

PLL_ON=H, VCYCXO_PC=H

IF_ON=H, PON_TX=H

PON_VRF3=H

setup 8920B as basestaion for

TX test audio signal?

Send command TX path ON

Send Command channel selection

(Test mode:136, 131)

START

AMPSTDMA

2 1

MODE

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2-11

STH-N271

Trouble Shooting

Replace U101

Need to check

V_RF2=3.0V or

Replace U304

U304_59(RF OUT)

Fc=Local_freq + 175.05

U101_61, 60, 58, 57

TX I/Q Quarature signal

AC Lev Vp_p=0.4V

DC bias Lev=1.5V

U101_63 MOD

(sinusoidal wave)

MAX Vp-p=1.4V

Freq=1004Hz

OSC303_1

(FM modulation out)

Freq=175.05MHz

Audio Freq=1004Hz

Need to check

OSC303,

V_IF_VCO=3.0V

Need to check

U304_66 or

Replace U304

U304_59(RF OUT)

measure Level

Send command PA_CNT

(Test mode:132)

Level is adjustable?

Replace F310

U304_59(RF OUT)

Fc=Local_freq + 175.05

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2-12

STH-N271

Trouble Shooting

Need to check

V_DRV_CELL=3.0V,

neighbor part or

Replace U307

U307 Gain

around 27dB

Replace F309

F309 Insertion loss

around 3dB

Need to check

V_PA_BAIS_CELL(U305_5,6,7)=3.0V

VBATT(U305_14,15,16)=3.2~1V

or Replace U305

U305 Gain

around 30dB

Need to check

F313 & neighbor parts

F306_1 around same power

with U305 output

Need to check

F313 & neighbor parts

F306 insertion loss

under 3dB

DONE

3. STH-N271 TEST PROCEDURE

1. List of Equipment

•

8920B TDMA M/S TEST SET (HP CARD, modified by Samsung )

• SIGNAL GENERATOR (2 SETS)

• SPECTRUM ANALZER

• DEVICE UNDER TEST (STH-N271)

• TEST INTERFACE ADAPTER

•

COMBINNER

• DC POWER SUPPLY

• PC

• Cables (RF CABLE, DATA CABLE, SERIAL CABLE, etc.)

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3-1

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3-2

STH-N271 Test Procedure

2. Configuration of Test

2-1. Test Configration-1

3 6

5 8

RF cable

DUT

Data cable

TEST I/F

ADAPTER

+ 3.8 V

A-OUT

TO PC TO HP

A-IN

DC P/S

4 pin cable

RF IN/OUT

A-OUT

A-IN

8920B TDMA M/S TEST SET

HP CARD

serial port

Signal GEN2

Signal GEN1

combinner

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3-3

STH-N271 Test Procedure

2-2. Test Configration-2

3 6

5 8

RF cable

coupler

DUT

Data cable

TEST I/F

ADAPTER

DC P/S

+ 3.8 V

A-OUT A-IN

RF IN/OUT A-OUT A-IN

HP CARD

8920B TDMA M/S TEST SET

Spectrum Analyzer

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3-4

STH-N271 Test Procedure

2-3. Test Configration-3 (Hands Free Kit)

Ignition Cable

DUT

Cradle

Data cable

Hands Free

Kit BOX

Power cable

DC Power

Supply

+13.7 V

Hands Free Mic

Hands Free Speaker

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3-5

STH-N271 Test Procedure

RF CABLE

DATA CABNLE

Table 3-Test Cable description

NAME DESCRIPTION 1 RF CONNECTOR Hook up to DUT RF switch 2 RF CABLE Line loss 1.5dB cable 3 BNC CONNECTOR Connect to TEST equipment 4 INTERFACE CONNECTOR Hook up to DUT Button connector (Table 4) 5 DATA CABLE & PST CABLE Normal data cable, PC Link 6 DSUB 25PIN CONNECTOR Connect to TEST I/F ADAPTOR (Table 5)

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3-6

STH-N271 Test Procedure

Table 4- Interface Button Connector

CN201 Pin Signal Name Comment

1 GBOOT_DI BOOT & Data IN (serial interface)

2 SCLK Serial Interface clock

3 DSR UART1 signal

4 SIN2 UART2 IN signal

5 DO Data OUT (serial interface)

6 SOUT2 UART2 OUT signal

7 RX_AUDIO HFK audio receiver signal

8 GND

9 C_FNSTRB Battery interface & Strobe (serial interface)

10 GND 11 TX_AUDIO HFK audio transmitter signal 12 GND 13 DP_RX_DATA UART1 RX data 14 DP_TX_DATA UART1 TX data 15 HP_PWR External power on ( Test I/F Adapter / HFK) 16 RI UART1 signal 17 CD UART1 signal 18 V_F Battery interface signal 19 GND 20 RTS UART1 signal 21 BATT 22 BATT 23 CTS UART1 signal 24 DTR UART1 signal 25 GND 26 C_F Battery interface & Strobe (serial interface) 27 V_F Battery interface signal 28 BATT Battery + Voltage

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