Samsung STH-N271 User 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)

SAMSUNG Proprietary-Contents may change without notice

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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1-2

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 ~ +60 oC

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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2-2

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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