Samsung STH-N375 User manual

SERVICE
TDMA MOBILE
TELEPHONE
STH-N375
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

©Samsung Electronics Co.,Ltd. May. 2002
Printed in Korea.
Code No.: GH68-02790A
BASIC.
ELECTRONICS

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1-1
1. STH-N375 Trouble Shooting
1. Baseband Section
1-1. Program No Running
N
Need to check
Q107, Q106
N
N
Need to check
U110, U111, U206
N
Need to replace
Memory(U202)
N
Need to check TCXO OSC302
& neighbor part
Press END
Key
Y
Y
Y
Y
Y
Y
ON_SW=H
VBAT>3.2V
VCTCXO_IN=14.4 MHz
Memory (U202)
control signal
OK?
VCC=3.0V
V_VCTCXO=3.0V
RESET=3.0V
IVCC=2.2V
GBOOT_DI=H
Program Running
VCC, ADD(0:21), DATA(0:15),
FLASH_CS, SRAM_CS, UBE,
MEMOEB, MEMWEB
N
ON_SW=H
Need to check
Key Mat Need to check
Battery

N
N
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1-2
STH-N375 Trouble Shooting
1-2. Abnormal LCD Module, Vibrator & Speaker Operation
Y
N
Need to check
CN202-1
Need to check
U312 & neighbor part
N
Need to check
R125, 126
Y
Y
LCD Control
Signal OK?
Y
Y
BACKLIGHT=H
Y
VCC, ADD(2), DATA(0:7),
DISPLAY_CS, RESET
LCD Display Running
Send Command Back Light enable
Y
N
Need to check
R216 & U205
Y
LCD Display Running
Back lingt Running
Send Command Vibrator enable
Need to check
Q109, R130, R162, R163, R164
START
Y
Y
N
Need to check
U101_77,79
Y
LCD Display Running
Back lingt Running
Vibrator Running
Send Command Main Audio Receiver Path ON
Send Command Audio tone generator ON
1
VIBRATOR=H
Vibrator Run
OK?
SPK+,SPK- Signal
OK?
LED Back light
OK?
Y
N
Replace U101
Good
Speaker Output
OK?

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1-3
STH-N375 Trouble Shooting
1-3. Abnormal Buzzer operation
N
Need to check
Q207, D201, U101
START
Y
Y
Send Command Ringer Path ON
Send Command tone generator ON
N
Replace AU201
Y
Y
Buzzer Sound Output
OK?
RINGER(U101_1)
Signal OK?
Buzzer Operation
Good

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1-4
STH-N375 Trouble Shooting
1-4. Abnormal external Ear_Mic Jack operation
START
Y
Y
Hock Up Ear_Mic Phone in the Jack(CN101)
Send Command MIC_BIAS_EN enable
Send Command AMP_EN enable
N
Need to check U106
neighbor parts
Y
HS_SENSE=H
N
Need to check U106
neighbor parts
Y
Y
SEND_END=H
Press Button on the Ear-Jack
Ear_Mic phone
Operation Good

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1-5
STH-N375 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
YCheck TX path
Measure
Tx Power
Good?

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1-6
STH-N375 Trouble Shooting
2-2. Receiver Section (Offline test)
1
Y
Y
N
Need to check
U105, Q102
Y
N
Need to check
U306, C349
F303_2=-52dBm
N
Need to check
F302 & 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
U105_1=H
Q102_3=H
Need to check
U300 & neighbor parts
2
U301_45=-39.5dBm
N
Need to check
C324, F303
F303_3, U300_8
=-55dBm
F302_2=-36.0dBm
Y

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1-7
STH-N375 Trouble Shooting
2
N
N
AMPSTDMA
N
Replace U301
Replace
F301
Need to check
OSC301, neighbor parts
& U301_1,2,3
Need to check
U105 & neighbor parts
N
Y
Y
Y
Y
YRF local check
U301_48 Lev=-6dBm
Freq=adjusted freq?
1
U301_41 Lev=-24.5dBm
Freq=130.05MHz
U301_34 Lev=-28.0dBm
Freq=130.05MHz
Need to check
U301, L301, C304, C306, R301
YReplace F300 or
Need to check R302, R303, C303
U301_25 Lev=-18.0dBm
Freq=450kHz
MODE
U301_40, 42=3.0V
43
N
U301_37 Lev=-13.0dBm
Freq=450kHz
N

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1-8
STH-N375 Trouble Shooting
N
Replace U301
Case TDMA mode:
setup basestation for RX test
Amplitude:-50dBm
3
U301_9, 10, 11, 12
measure I/Q
Quarature wave N
Need to check U301 &
Quad LC Tank circuit
(L303, C315, C316,
C317, R307)
PON_LD=H
Case AMPS mode:
setup basestation for RX test
Audio Freq gen : 1004Hz
FM deviation : 2.9kHz
4
Y Y
Y
U301_16 DEMOD
(sinusoidal wave)
Vp-p=240mV
Freq=1004Hz
N
Need to check U301 &
R326, R320, C352, C127
U101_52 DEMOD
(sinusoidal wave)
MAX Vp-p=1.4V
Freq=1004Hz
N
Replace U203
Y
U101_40 BBCLK=
6.2208MHz or 4.096NHz 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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1-9
STH-N375 Trouble Shooting
2-3.Transmitter Section (Offline test)
N
Replace U203
N
Replace U203
N
Replace U203
N
Replace U203
Y
Y
Y
U101_40 BBCLK=
6.2208MHz or 4.096MHz or
5.12MHz
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

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1-10
STH-N375 Trouble Shooting
1
3
Replace U101
Y
Y
Need to check
V_RF2=3.0V or
Replace U301
2
Y
U301_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
NN
N
N
Y
Need to check
U301_66 or
Replace U304
U301_59(RF OUT)
measure Level
Send command PA_CNT
Level is adjustable?
N
Y
Replace F306
U301_59(RF OUT)
Fc=Local_freq + 175.05 N
Y

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1-11
STH-N375 Trouble Shooting
3
Y
Need to check
V_DRV_CELL=3.0V, U112 or
Replace U305
U305 Gain
around 27dB N
Y
Replace F305
F305 Insertion loss
around 3dB N
Y
Need to check
V_PA_BAIS_CELL(U302_5,6,7)=3.0V
VBATT(U302_14,15,16)=3.2~4V
or Replace U302
U302 Gain
around 30dB N
Y
Need to check
F304 & neighbor parts
F304_1 around same power
with U302 output N
Y
Need to check
F304 & neighbor parts
F303 insertion loss
under 3dB N
DONE

SAMSUNG Proprietary-Contents may change without notice
3-1
3. STH-N375 Exploded View and its Parts List
1. Cellular phone Exploded View
1
3
4
5
7
6
8
9
11
13 13
15
12
10
2
4-1

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3-2
STH-N375 Exploded view and its Part List
FRONT COVER
SPEAKER
KEY PAD
MAIN PBA
LCD
MIC HOLDER
MIC
SHIELD COVER
VIBRATOR
COVER CONNECT
ANTENNA
REAR COVER
SCREW DUMMY
SCREW (M1.7 x L3.5)
RF JACK COVER
BATTERY
2. Cellular phone Parts List
1
2
3
4
4-1
5
6
7
8
9
10
11
12
13
14
15
Description Remark
SEC CODE
Silver
Location
No.
900mAh
GH75-01724A
3001-001210
GH75-01826A
GH82-00107A
GH07-00143A
GH73-01024A
GH59-00376A
GH75-01895A
GH31-00019A
GH73-01026A
GH42-00141G
GH72-03845A
GH73-01130A
6001-001319
GH73-01027A
GH43-00490A

STH-N375 Exploded view and its Part List
SAMSUNG Proprietary-Contents may change without notice
3-3
3. Test Jig (GH80-00614A)
4. TC (GH44-00145G) 110V
Mexico, Colombia, Brazil
Serial Cable
Power Supply Cable
5. RF Test Cable (GH39-00090A)
6. Test Cable (GH39-00092A)

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4-1
4. STH-N375 Block Diagrams
1. Base Band Part Block Diagram
.
MOD
PLL
Synthesizer
Power
Management
PREAMP_G
Aux
ADDR
DATA
C TL
EXT
MEMORY
(U206)
KEY PAD
OSC301
TCXO
(14.4MHz)
EXT
SYSTEM
RF IF
AGC_OUX RX_I RX_IX RX_Q RX_QX DEMOD A_IF_I RSSI MOD TX_I TX_IX TX_Q TX_QX TX_PWR PA_CNT AFC_OUX
AUDIO IF
REC2O+ REC2O-
MIC+ MIC-
RAUXO
XAUX
PA_GATE ALC_EN RX_BAT TX_BAT PLL_CLX PLL_DATA PLL_STRB PREAMP_G
Digital SignalX BBCLK RX_CLK RX_DATA RX_SYNC TX_CLK TX_DATA TX_SYNC RST WBDRX WBDTX SI2 SO2 SCK2
BEC IF
PART
EXT
AUDIO AMP
(U102)
DISPLAY
GPIO
s
TCXO_I
UART
AUX
rx

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4-2
STH-N375 Block diagrams
2. Radio Part Block Diagram
RSSI AGC OUT
MOD
D5204-22/ D5205 (U101/ U203) PREAMP_G AFC Rx I/Q
3 wire Bus
DEMO
Gain Cont
RSSI
PLL2
x9
PLL1
BPF
130 05
1/32
BPF
450k
LC LC
BPF
450k
LC
D836MH IL= 3 0Typ 3 6Max
SLC-S090S-A(F304)
IL=0 25Typ,0 5Max CPL = 15 5dB
Rx
869-
894
Tx
824-
849
DFY0836H0881F(F303) Tx IL=2 6Typ, 2 8Max Att at Tx = 56Min, 58Typ ISO at Tx = 60Min Rx IL =3 3Typ, 4 0Max Att at Rx = 50Min, 52Typ ISO at Rx = 53Min Image rejection at Ftx - 45MHz = 8Min
LNA
BPF
824-849
BPF
869-894
D881LH(F302) IL=3 0Typ 3 5Max
Matsushita : NFVZ4J39(OSC301)
Freq range: 998~1025MHz, 2059~2121MHz Vcont : 0 4 ~ 2 2 PN : -114dBc@45kHz (Cell) -102dBc@45kHz (PCS) ZL : 50 ohm Pout : -3 +/- 3dBm (in both band) Current consumption : 8mA
Matsushita: NFVZ5J41(OSC303) Freq range: 170 05MHz, 210 09MHz Vcont : 0 4 ~ 2 2, Switch operation PN : -102dBc@60kHz (Cell) -102dBc@60kHz (PCS) Harmonics : -10dBc max Pout : -3 +/- 3dBm (in both band) Current consumption : 5mA
RFMD: RF2162(U302) Linear Gain = 30Typ, 28Min Po (AMPS) = 31 5Typ, 30Min Po (TDMA) = 30Typ, 29Min PAE = 50(analog), 35(digital) ACPR@30kHz = 29Typ, 28Min @60kHz = 49Typ, 48Min @90kHz = 56Typ, 55Min Noise PWR = -90dBm(30kHz BW) 2nd Harmonic = -30Typ, -29Min 3rd Harmonic = -40Typ, -39Min Idle current (mA) = 135Typ, 200Max
TOKO: SF130JS-002(F301) IL = 3 4Typ, 4 5Max GD (us) = 1 5Typ, 8Max ISO at 60k = 22Typ, 12Min ISO at 120k = 45Typ, 35Min ISO at 240k = 55Typ, 50Min ISO at 480k = 55Typ, 50Min ISO at Image 900k = 75Typ, 66Min ZL = 500ohm//-2 1pF
CFUXC450B100H(F300)
IL = 4 5Typ, 6 0Max GD (us)= 5Typ, 15Max Zin/out = 2k
VC-
TCXO
14 4MHz
Toyocom: TCO-9133(OSC302) Current drain = 1 5mA Max Output level = 0 8Vpp min Load = 10kOhm//10pF PN(dBc) = -130@100Hz, -152@45kHz
129 6MHz
999 09~1024 02MHz 2060 1~2120 04MHz
450kH
z
BPF
824-849
RF2376(U305) G(dB) = 24<27<30@836MHz Current(mA) = 30Typ ACP Leakage(dBc) = -33@8dBm Pout, 30kHz offset -61@8dBm Pout, 60kHz offset NF(dB) = 7Max
Quad
Tx I/Q DC ref
uPC8015
(U304)
RFMD: RF2363 G(dB) = 18Typ NF(dB) = 1 3Typ, 1 6Max IIP3(dBm) = 5Typ Step AGC = 26Min, 38Max Current(mA) = 5Typ
Mixer1 (N C: uPC8015) G(dB) = 5Min,6 8Typ,9Max NF(dB, DSB) = 12Typ,14Max IIP3(dBm) = 7 8Typ, 5 5Min Current(mA) = 17 6Typ
Mixer2 (N C: uPC8015) G(dB) = 13 5Min,15 5Typ,18Max NF(dB, DSB) = 11 2Typ,13Max IIP3(dBm) = -19 3Typ, -21Min Current(mA) = 3Typ AGC+I/Q Demod (N C: uPC8015)
VG(dB) = 75Min,80Typ,85Max NF(dB, DSB) = 10Typ,13Max IIP3(dBm) = -85Typ, -92Min AGC Range = 77Min, 84Typ Current(mA) = 3Typ
Limiter Discriminator (N C: uPC8015) Sens at 12dB SINAD (Using discrete 450kHz BPF) = 75Min,80Typ,85Max IIP3(dBm) = -68 5Typ, -70Min Filter rejection at 60kHz = 10Typ, 7Min Filter rejection at 120kHz = 15Typ, 10Min Filter rejection at 330kHz = 25Typ, 20Min Filter rejection at 660kHz = 35Typ, 30Min Current(mA) = 2 8Typ
RF Out (N C: uPC8015)) Po = -10Typ, -12Min ACPR@30kHz = 32Typ, 30Min @60kHz = 60Typ, 58Min @90kHz = 60Typ, 58Min Noise in Rx band@30kHz = -95dBmTyp,-93Min Spurious suppression@10dBmOut LO = 55dBcTyp,54Min Image = 8dBcTyp,7Min FLO-FIF = 47Typ 45Min
GCA Amp(N C: uPC8015) Cell Band Dynamic Range (dB) = 60Min,65Typ,70Max Gain Slope (dB/V) = 38Min,48Typ,55Max PCS Band Dynamic Range (dB) = 60Min,65Typ,70Max Gain Slope (dB/V) = 38Min,48Typ,55Max
D836MH(F305) IL= 3 0Typ 3 6Max
D836MH(F306) IL= 3 0Typ 3 6Max

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5-1
5. STH-N375 PCB Diagrams
1. Main PCB Top Diagram
AU201
C104
C107
C109
C111
C130
C133
C134
C135C136
C137
C138
C139
C140
C141
C142
C143
C145
C146C147C149C151
C156
C170
C180
C183
C185
C186
C201
C203
C214
C221
C222
C229
C233
D201
D202
D203
D204
D205
D206
D207
D208
D209
D210D211
D212
D213
G1 G2
G3
G4
G5 G6
G7 G8
L101
L102
L104 L105
MIC101
P201 P202 P203 P204 P205 P206
Q105
Q106
Q107
Q108
Q203
Q204 Q206
R102
R107
R111
R116
R121
R124
R128
R130
R132 R135
R143
R144
R145
R146
R147
R148
R149
R150
R151
R152
R153
R162
R163 R164
R208
R210
R215
R216
R219
R236
R240 R241
R244
R246
R247
R249 R250
R251 R252
R253
R254
RV204
S202
S203
S204
S205
S206
S207
S208
S209
S210
S211
S212
S213
S214
S215
S216
S217 S218
SPK101
SW201
U201 U205
U312
ZD202
ZD204
ZD205
ZD207
ZD208
ZD211

SAMSUNG Proprietary-Contents may change without notice
5-2
2. Main PCB Bottom Diagram
STH-N375 PCB diagrams
ANT301
BT201
C101
C102 C103
C105
C106
C108
C110
C112
C115
C116
C117
C118
C119
C120
C121
C122
C124
C125
C126
C127
C129
C131
C148
C152
C155 C157
C158
C159
C160
C161
C162 C163
C164
C165
C166
C167
C168
C169
C171
C172
C173
C174
C175
C176
C177
C178
C179
C181
C182
C184
C187
C188
C190
C191
C202
C205
C206
C207
C208
C209
C210
C211C212
C213
C215
C216
C220
C223
C230
C234
C300
C301
C302
C303
C304
C305
C306
C307
C308
C309
C310
C311
C312
C313
C314
C315
C316
C317
C318
C319
C320
C321
C322
C323
C324
C325
C326
C327
C328
C329
C330
C331
C332
C333
C334
C335
C336
C337
C338
C339
C340
C341
C342
C343
C344
C345
C346
C347
C348
C349
C350
C351
C352
C353
C354
C355
C356
C357
C358
C359
C360
C361
C362
C363
C364
C365
C366
C367
C368
C369
C370
C371
C372
C373
C374
C375
C376
C377
C378
C379
C380
C381
C382
C383
C384
C385
C386
C387
C388
C389
C390
C391
C392
C393 C394
C395
C396
C397 C398
C399
C400
C401
C402 C403
C404
C405
C406
C407
C408
C409
C410
C411 C412
C413
C414
C415
C416
C417
C418
C419
C420
C421
C422
C423
C424
C425
C426
C427
C428
C429
C430
C431
CN101
CN201
CN202
D301
F300
F301
F302
F303
F304
F305
F306
L300
L301
L302
L303
L304
L305
L306
L307
L308
L309
L310
L311
L312 L313
L314 L315
L316
L317
L318
L319
L320
L321
L322
L323
L324
L325
L326
L327
OSC301
OSC302
OSC303
Q101
Q102
Q104
Q109
Q202
Q207
Q208
R101
R103
R104
R106
R108
R109
R110
R112
R113R114
R115
R117
R118
R119
R120
R122
R123
R125
R126
R129
R131
R133
R134
R136
R137
R138
R139
R140
R141
R142
R154
R155 R156
R157
R158
R159
R160
R201
R202
R204
R205
R206
R207
R209
R211
R212
R213
R214
R217
R218
R221
R223
R224
R225
R233
R237
R238
R239
R242
R245
R248
R255
R256
R300
R301
R302 R303
R304
R305
R306
R307
R308
R309
R310
R311
R312
R313
R314
R315
R316
R317
R318
R319
R320
R321
R322
R323 R324
R325
R326
R327
R328
R329
R330
R331
R332
R333
R334
R335
R336
R337
R338
R339
R340
R341
R342
R343
R344
R345
R346
R347
R348
R349
R350
R351
R352
R353
R354
R355
R356
R357
R358
R359
R360
R361
R362
R363
R364
R365
R366
R367
R368
R369
R370
R371
R372
R373
R374
R375
R376
RV202
RV203
TH101
U101
U102
U105
U106
U107
U108
U110
U111
U112
U202
U203
U206
U300
U301
U302
U303
U304
U305
U306
Y201
ZD101
ZD201 ZD203 ZD206
ZD209
ZD210