Samsung STH-N375 service manual.pdf

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Samsung STH-N375 service manual
TDMA MOBILE
TELEPHONE
STH-N375
SERVICE
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
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ELECTRONICS
© Samsung Electronics Co.,Ltd. May. 2002
Printed in Korea.
Code No.: GH68-02790A
BASIC.
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1. STH-N375 Trouble Shooting
1. Baseband Section
1-1. Program No Running
Press END
Key
Y
ON_SW=H
N
ON_SW=H
N
Y
Need to check
Key Mat
Need to check
Battery
VBAT>3.2V
N
Y
Need to check
Q107, Q106
VCC=3.0V
V_VCTCXO=3.0V
RESET=3.0V
IVCC=2.2V
GBOOT_DI=H
N
Y
Need to check
U110, U111, U206
VCTCXO_IN=14.4 MHz
N
Y
Need to check TCXO OSC302
& neighbor part
Memory (U202)
control signal
OK?
N
VCC, ADD(0:21), DATA(0:15),
FLASH_CS, SRAM_CS, UBE,
MEMOEB, MEMWEB
Y
Need to replace
Memory(U202)
Program Running
SAMSUNG Proprietary-Contents may change without notice
1-1
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STH-N375 Trouble Shooting
1-2. Abnormal LCD Module, Vibrator & Speaker Operation
START
Y
LCD Control
Signal OK?
N
VCC, ADD(2), DATA(0:7),
DISPLAY_CS, RESET
Y
Need to check
U312 & neighbor part
LCD Display Running
Send Command Back Light enable
Y
BACKLIGHT=H
N
Y
Need to check
R125, 126
LED Back light
OK?
N
Y
Need to check
Q109, R130, R162, R163, R164
LCD Display Running
Back lingt Running
Send Command Vibrator enable
Y
VIBRATOR=H
N
Y
Need to check
R216 & U205
Vibrator Run
OK?
N
Y
1
Need to check
CN202-1
Y
LCD Display Running
Back lingt Running
Vibrator Running
Send Command Main Audio Receiver Path ON
Send Command Audio tone generator ON
Y
SPK+,SPK- Signal
OK?
N
Y
Need to check
U101_77,79
Speaker Output
OK?
N
Y
Replace U101
Good
SAMSUNG Proprietary-Contents may change without notice
1-2
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STH-N375 Trouble Shooting
1-3. Abnormal Buzzer operation
START
Y
Send Command Ringer Path ON
Send Command tone generator ON
Y
RINGER(U101_1)
Signal OK?
N
Y
Need to check
Q207, D201, U101
Buzzer Sound Output
OK?
N
Y
Replace AU201
Buzzer Operation
Good
SAMSUNG Proprietary-Contents may change without notice
1-3
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