Samsung STH-N275 User manual

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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1-1
1. 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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1-2
Trouble Shooting
N
Need to check
U103 & neighbor part
N
Need to check
R126, C148
1-2. Abnormal LCD display ,EL Baob 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
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
N
Need to check SPK101
& neighbor part
Y
Y
REC20+,- Signal
OK?
LCD EL Vibrator OK Send Command
Main Audio Receiver Path ON, Send
command Audio tone generator ON
Good

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1-3
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
Input Audio signal to 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
Audio signal outpur
at Speaker?
GOOD

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1-4
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
Send Command tone generator ON
N
Replace CN202
Y
Buzzer Sound Output
OK?
Buzzer Operation
Good

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1-5
Trouble Shooting
1-5. Abnormal external Ear_Mic Jack operation
START
Y
N
Need to check Q102,
CN101 & neighbor parts
Y
Y
HEADSET_SENSE=H
Hock Up Ear_Mic Phone in the Jack(U102)
Send Command MIC_BIAS_EN enable Send
Command AMP_EN enable
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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1-6
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

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1-7
Trouble Shooting
1
N
Need to check
U302
2-2. Receiver Section (Offline test)
Y
Y
Y
Y
F305 input=-55dBm
N
Need to check
F305
N
Need to check
U105, U106, U107
F305 output=-49dBm
Y
N
Need to check
F306
U301_8=-53dBm
N
Need to check
F304 & neighbor parts
Y
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 Cell band selection
Send Command RX path ON
Send Command channel selecton
START
N
Y
V_LNA_CELL=H
U107_1=H
U105_1=H
Need to check
U301 & neighbor parts
F304 input=-33dBm
2
U304_45=-33dBm

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1-8
Trouble Shooting
2
N
N
AMPSTDMA
N
Replace U304
Replace
F302
Need to check OSC301,
neighbor parts & U304_1,2,3
Need to check
U105 & neighbor parts
N
Y
Y
Y
Y
YRF loal check
U304_48 Lev=-6dBm
Freq=adjusted freq?
1
U304_41 Lev=-23dBm
Freq=130.05MHz
U304_34 Lev=-33dBm
Freq=130.05MHz
NNeed to check
U304, L303, C308, L301, C307
U304_37 Lev=-1dBm
Freq=450kHz
Y
NReplace F301 or
Need to check R302, R304, C301
U304_25 Lev=-7dBm
Freq=450kHz
MODE
U304_40, 42=3.0V
43

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1-9
Trouble Shooting
N
Replace U304
Case TDMA mode:
setup basestation for RX test
Amplitude:-50dBm
3
U304_9, 19, 11, 12
measure I/Q
Quarature wave N
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
4
Y Y
Y
U304_16 DEMOD
(sinusoidal wave)
Vp-p=24mV
Freq=1004Hz
N
Need to check U304 &
R327, R323, C353, C107
U101_52 DEMOD
(sinusoidal wave)
MAX Vp-p=1.4V
Freq=1004Hz
N
Replace U203
Y
U101_40 BBCLK=
6.2208MHz or 4.96NHz or
5.12MHz
N
Replace U203
Y
U101_32RX_CLK=
BBCLK/2 or
BBCLK/8
N
Replace U203
Y
U101_31 RX_SYNC=
BBCLK/32 or
BBCLK/128
N
Replace U203
Y
U101_31 RX_DATA=
serial data
DONE

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1-10
Trouble Shooting
N
Replace U203
N
Replace U203
N
Replace U203
N
Replace U203
2-3.Transmitter Section (Offline test)
Y
Y
Y
U101_40 BBCLK=
6.2208MHz or 4.096MHz
or5.12MHz
Y
U101_34 TX_CLK=
BBCLK/32 or BBCLK/8
Y
U101_33 TX_SYNC=
BBCLK/512 or BBCLK/128
Y
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 cell band selection
Send command TX path ON
Send Command channel selection
START
AMPSTDMA
21
MODE