Samsung STH-N271 User manual

SERVICE
SINGLE BAND Mobile
Cellular Phone
STH-N271
23
6
45
8
79
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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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

N
Need to check
Q107, Q106
N
Replace dome S/W
N
Need to check
Q107, Q106
N
Need to replace
Memory(U202)
N
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
Y
Y
Y
Y
Y
Y
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
N
Need to check
U103 & neighbor part
N
Need to check
R126, C148
1-2. Abnormal LCD display ,EL Back Light, Vibrator & Speaker Operation
START
Y
Y
LCD Control
Signal OK?
Y
Y
EL_EN=H
N
Need to check U104
& neighbor Part
Y
EL Back light
OK?
VCC, ADD(2), DATA(0:7),
DISPLAY_CS, RST
LCD Display Running
Send Command EL
enable(Test mode:176)
N
Need to check
R216, U205, D202
Y
Y
VIBRATOR=H
N
Need to check CN202
Y
Vibrator Run
OK?
LCD Display Running
EL Back lingt Running
Send Command Vibrator
enable(Test mode:180)
N
Need to check SPK101
& neighbor part
Y
Y
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
N
Need to check Dome
S/W & U103
N
Need to check MIC101
& neighbor part
1-3. Abnormal Key, Mic, LED’S operation
Press Keys
Y
Y
Key Dispaly
OK?
Y
Key Display Good
Send Command Main Audio Path ON
(Test mode:031, 131, 136, 187)
Talking Voice at MIC+
N
Need to check
D210, D211, Q204, Q206
Y
Y
Y
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
Y
N
Need to check
U204, D201, CN202
Y
Y
Ringer Signal
OK?
Send Command Ringer Path ON
(Test mode:183)
N
Replace CN202
Y
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
Y
N
Need to check Q101,
CN101 & neighbor parts
Y
Y
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)
N
Need to check Q102,
CN101 & neighbor parts
Y
Y
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
N
DONE
START
Y
Y
Normal SVC?
Check RX path
N
Y
Set up Call OK?
Check TX path
N
Y
Measure SINAD/BER
Good?
Check RX path
N
Y
Measure
Tx Power Good?
Check TX path