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CAR AUDIO PLAYER
SC-7400 SC-7400B
SERVICE
CAR AUDIO PLAYER
Manual
CONTENTS
1. Alignment and Adjustments 2. Reference 3. Exploded Views and Parts List 4. Electrical Parts List 5. Block Diagrams 6. PCB Diagrams 7. Schematic Diagrams 8. Troubleshooting
1. Alignment and Adjustments
1-1 Instruction
60dB -> 14dB FM Search Level Adjustment V-CUT SSG FREQ. 98MHz G V-CUT
J118 J412 C105
VTVM 0dB
O/SCOPE
FM SET G -3dB SVR101 200KB FM SSG
DIPPING
Adjustment Point (SVR101) SEMI-VR(200K ohm)
Adjust is SVR101 : -3dB Limiting Sens 14dB Adjust
D101 L101
G VTVM O/SCOPE
J214
CN601
C611
IC601 C616
C107
C140
C609
M010831
J605 J606 C504 J117 J604
ANT101
C108 CW301 CF101 Q101 J404 J403 J402
R117 Q202 J709 J708 J701 R601 J408 R602 R604 R603 R114 R210 Q104 J101 Q103 CF102
J401
FM DET COIL Adjustment Dev75KHz 60dB SSG FREQ. Adjustment Point (IF101) 98MHz
R121 LEFT PIN VOLT METER 0 +/-10mV
J213
J212
R705
J102
J506
R519
ZD502
FM SET FM DETECTOR COIL FM SSG G
J210 J211 IC502 J509 C617 J510 J511 C407 R414 IC401 J705 J409 J305 D702 C406 J209 R706 R707 J208 J710 Q410 Q702 Q401 C422 Q701 J307 D511 J113 IC501 Q402 D403 ZD401 R422 J308 XT501 J411 J706 J707 C410 C411 C419 C418 J505 J106 J503 J504 R221 J702 SV102 R146 C134 J410 R510 J405 J704 Q505 Q201 J111 J406 J407 D202 D203 C133 D107 D106 C122 J501 J502 J202 F101 R121 C120 J201 J104 D103 R116 C115
R126 IC101
C117
Q504
Q105
SV101
R121 2 POINT : DC VOLT METER 0 +/-10mV
R121 LEFT PIN
IF101 D104
J105
FM Stereo Adjustment
D105
MONO
IC103 13pin FREQ. COUNTER FM SET 19KHz G
SSG FREQ.
TNR201
98MHz MONO G Pilot(19KHz) SEMI-VR(10K ohm)
C139
D401
IC102
J108 J112 J703 C137
C138
SVR103
Adjustment Point (SVR103)
FM SSG 10KB
IC 50 3
Q408
SV103
R534
J304 J603
J602
D201 J601 J203
J207
Q405
D507
R528
R529
J115
R425 Q404
Q406
R424
J205 R502 R427 J114 J206
D502
R513 R512 R511 J110 J204
C506 R518 Q502
C501
A1
FADER
ENCLK
A0
Q501 ZD501 D516
FM ONLY
ENAUX
A2
CN501
R212
C143
J116
Q407
ZD403
J303
J109
Adjust is SVR103 : FREQ. Counter 19KHz +/- 50Hz (IC103 13pin)
V-CUT FM Stereo Separation Adjustment
Dev75KHz 60dB
R
VTVM
O/SCOPE
SW501
SSG FREQ.
98MHz Stereo G FM SSG SVR102 SEMI-VR(20K ohm)
FM SET
-
SC-7400 MAIN PCB TOP SILK 2001.08.31.
V-CUT
G
20KB
Adjustment Point (SVR102)
L -
G VTVM O/SCOPE
Adjust is SVR102 : Sepí MAX
Samsung Electronics
1-1
1-2
Samsung Electronics
5. Block Diagram
ANT OUTPUT FM TUNER TNR101 KST-F102VD-1 IC601 FM IF IC101 LA1140 FM MPX IC103 LA3370 RR/FR
POWER IC
TDA7381
OUTPUT RL/FL
AM OSC/VT // FM OSC/VT
FM OUT L/R
AM OUT
AUDIO INPUT RR/RL/FR/FL
AM TUNER TNR201 YC-AM001 PLL IC IC502 KIC9256P E/VOLUME IC401 PT2313L
M
MOTOR DRIVE IC303 FAN8082
M
TAPE OUT L/R SCL/SDA PERI/DATA/CLK
TAPE EQ IC301 KIA2025 DECK CONTROLLER
u-COM IC CE/CLK/ IC503 LCD901 IC901 LCD IS09080E00V3 LC75883E LCD DRIVE DATA YC7400
Samsung Electronics
AMS SIGNAL
AMS IC IC302 LA2000
SC-7400
5-1
6. Printed Circuit Board Diagram
6-1 FRONT
* TOP VIEW
SW901
PWR
LD901
SKQCAED010 SW917 LD920 + 1CHUBJ LD923 + 87HGE LD913 SW908
87HAE
V-UP
EJECT
BAND
T-UP
SW902 SKQCAED010 1CHUBJ LD902 87HGE
SKQCAED010 SW906
SKQCAED010
F010828
LD914 + 1CHGES
LD916 87HGE LD918 87HGE
SEL
SKQCAED010 LD904 + SKQCAED010 SW907
T-DN
+ 1CHUBJ LD921
1CHUBJ SW904
87HGES 87HGES
LD915 + 1CHGES
LD917
87HGE LD903
SW905 SKQCAED010
LOUD
87HGE SW919
SKQCAED010 SKQCAED010
V-DN
LD905 +
87HGES LD906
87HGES LD907 SW912 LD910
87HGES LD908 LD911
87HGES LD909 SW914 SKQMALE010 LD912 87HGE
AS/PS
SKQCAED010 CLOCK
SW903
+ LD922
M1
SKQCAED010 MUTE SKQCAED010 SW918 + SW910
M6
SW915 SKQCAED010
SW909 SW916 SKQCAED010
SKQCAED010
87HGE
+ SW911 SKQCAED010
M2
M3 SKQMALE010
87HGE
+
+ SW913
M4
MODE
M5 SKQMALE010
* BOTTOM VIEW
R928 220
R936
100
R909 R927 R926 220 820 1.2K 1.5K 27K R925 R924 15K 8.2K R933 270 R916 R917 R907 R918 R931 220 R923 IC901 220 473 220 R912 330 390 470 680 R935 100 ZD903 39K 102 ZD904 ZD905 47K 47K 47K
220 R910 R911 220
R901 C902
R913 R914 R915
4.7K ZD902 R932 220 ZD907 ZD901
ZD906 R930 220
CN901
R905 R904 R903 R902 47K C901
4.7K R906
R929
220
5.6K R922 R921 3.9K 2.7K R920
2.2K R919
Samsung Electronics
6-1
R706
R707
J208
104
104
Q702 1K R703 47K R702
Q701
J115 22K R517 J116 Q406 Q502 ZD501
R518
C612
D702
R705 C504 R516 R515 J209
C701
C617
+
47K 47K C410 C406 ZD403 J213 J305 J212 47K 47K R521 R520 Q504 J710 C424 104 C423 Q410 104 10K R426 Q405 330 C501 Q408 D516 C403 R428 104 1K 2.2K R420 SW501 R405 5.6K C411 C422 R609 R610 10K 10K R425 Q404 J604 J605 J606
+ + +
6.8K R424 R435
Q401 R704 330 R410 R408 680K 1.5K 47K R701
C407
CN601
+
+
C506 C505
+
+ +
150K R403 R432
+
C611 R414 150K R404 R430 680K R433 R411 R409 680K 1.5K
J709 J708 470 PT2313L C408 C409 R415 C412 5.6K 104 104 104 104 5.6K 5.6K Q402 D401 R502 R427 J307 D511 J207 Q407 R423 10K IC501 R535 J205 J206 Q501 100K R501 R534 10K 47K J114 R514 330 R416 C413 104 102 102 330 104 10K C419 + R417 C414 R406 C415 + C416 C418 C417 R418 D403
C609
+
J210 J706 R605 C601 R422 J509 J409 J410 R533 ZD401 J118 J408 1M R602 104 C420 C421 104 R523 J303 R524 8.2K 8.2K R603 56p C502 J501 J502 R510 C507 47p 104 206J XT501 J704 J503 J504 J505 56p C503 J603 C511 J113 R526 J304 8.2K 8.2K R525 J411 J214 1 C606 C602 R606 104 22K 22K 104 R608 R604 104 102 102 J506 J507 J508 R601 J705 C605 J510 J511 J308 J707 22K J211
IC401
J412
13
9
5 IC601
C604 102 C608 102 C607 C603 22K 104 R607
D507
21
17
J117 25
R527 4.7K R528 R529
104 C610
+
C616
IC502
C207
103
J111 Q201 J104
R506 47K 47K R505 47K R504 R503 47K J112 J703 R221
CW301
J701
R513
R512
J405
R519 C508 D103 223 J201 C110 ZD502 R114 F101 2.7K 103 J101 C102 2.7K R522 R210 C109 103 R112 470 R113 R116 1M R119 223 Q105 R111 C108 R163
J406
J102
J407
C203 102
D202
R148 4.7K 153 3.3K R147 3.3K R153 153 C142 R152 R158 1K C139 10K R154 + 10K 4.7K J108 C138 10K R159
J110
J106 47K R156 D107 D106 R150 C136 C144 682 22K R202 47K C135 R201 D203 22K
J601
R511
R211 J109 47K R214
22K
C510 D201 223 1M 1M 223 R531 R532 682 J204 C509
R117
102
C105
C140
+223 C114
C107
J404 CF102
R120 22K 104 C202
1K
J202 223 C112
Q202
Q104
Q103
C201 J702 103
R212
R121 330
+
C115
J403 4.7K R103 R106 330 4.7K R104 CF101 J401 R101 R102 R107 10 R118 C117 SV101 J402 330 R105 C103 223 Q101
+
+
+
C120 C106 15p C133
R160
J203 R155 SV102
+
47K R125 C116 100p C113
1K R146 IF101 C134 R149
ANT101
IC102
D101
+C122
1K R127 R122
+
+
C143 R203 R225 10K C204 R126 R123 18K
+
C118 104 10K R128
C121 33p C132 104
D104 J105 C141
223
L101 56K R109 10
D105
R151 5.6K TNR201
15K
100 2.2K
R108 56K
C101 104
R129 3.3K
IC101
R124 22K
C205 223
6-2 MAIN
2.2K 10K 223
SV103
+ C137
CN501
6-2
IC
50
Q505
104 C401 R401 56K
D502 R530 4.7K
Samsung Electronics
3
CN304
R318
10 10
R319
J302 J105
R320
1K
C316
1K
R321
IC303
ZD301
Q301
R322
1K CN303 Q302
R323
1K
J301
C312 333 J104 R316 150K J203 J202 IC302
+
C313
J201
+
R317
8.2K 472
C315
C314
J404 J403
R314
R315
47K
47K
+
C311
C310
+
J401 R324 R325 J103 CN302
R310
10K
12K 18K
R306 C308 R309
R313
R312
12K 153 330K 68 IC301
R301 C301 R311 18K 33K C309 153 102 330K 102 33K R307 68 102 J102 33K C303 C304
R305
+
R308
C305
R302
C302
+
C307
J101 CN301
Samsung Electronics
33K 102
6-3 EQ
R303 R304
C306
+
47K 47K
J402
6-3
7. Schematic Diagram
IF101 FM35 ANT101 C101 104 R101 22K C120 1/50 R106 10 R103 27K R121 22K 27K 330 R147 3.3K R124 22K C121 33p R122 10K D104 1N4148 R148 C135 183 4.7K C136 19K-ADJ 472 D106 1N4148 R150 47K R320 10 10 5 6 R318 7 R149 C137 1K 3.3/50 C138 1/50
+ +
1N4148 104 R146 10
R120
R123
TNR101 KST-F102VD-1
C103 223
FM VT FM VDD AGC C102 FM ANT GND 102
CF101 10.7MJ
100
+
IF OUT
D105 C132
10/16
R102
+
FM OSC
Q101 C3192-0
C134 SV102
R119
330
MAIN ASSíY
GND EQ+ TAPE-R TAPE-L ON-B+ MOTOR+ F/R TAUNLOAD TALOAD R-SENS1 R-SENS2 MS-SENS TAMODE1 TAMODE2 TAMODE3 GND GND GND C310 4.7/50
+
20KB
R319 8
1K
IC303 FAN8082 47K 47K 4 1K ZD301 3 B3.3V 2 1
P DETECT
M-ATT-AD
S-METER
SEP-ADJ
QUAD IN
19K ADJ
IF OUT
L OUT
C133
GND
HCC
CF102 10.7MJ C106
R104 4.7K
R105 330
RIP FIL
15p
47/10
IF IN
Vref
VCC
AFC
L/ML/M+ M/MM/M+
+
R324 R325
1
3
5
7
9
11
13
15
1
3
5
7
9
11
13
15
R109 56K R108 C105 56K SV101 100KB R107
2 4 GND 6 MUTE IN
IC101 LA1140
8 AF OUT 10 GND 12 VCC 14 M-DRIVE 16 AGC 2 INPUT 4 HC CONST 6 R OUT
IC103 LA3370
8 SNC 10 ST IND 12 P DETECT 14 RIP FIL 16 OSC CON
C139
1/50
+
R321
2.2K
1/50
R322 R323
1K 1K Q301 NC RRP PDA FRP PFC MODE2 MODE1 MODE3 GND
+
F101 K161 R111 1K C107
+
C113 223 C115 10/16 100p 223 223 47K R126 10K 100/10 C117 C118
+
R127 C122
+
1K 10K
1/50 3.3K 5.6K 223 3.3K 1K 183 R154 SV103 10KB C143 4.7K R155 15K
D107 1N4148 R156 47K
C103 Q302
2.2/50 4.7K 470 103
C112
R125
C114
C116
R128
R129
C140
100/16
104
C108 M223 Q103 C3199Y
+
+
R151
R152
C141
C142
R153
C144 472
M102
C103 R306 330K R310 18K 12K R313 10K C308 153 R305 68 C305
+
R112 C109
2.2uH
L201
Q104 C3199Y
R113
R118 10 D202 D203 1N4148 1N4148
47/16 R301 C301 102 33K
22K
R116
R210
R117
22K
10
Q105 C3199Y
22K
103
R202
16
15
14
R309 13 12 IC301 KIA2025 4 5
D101 1N4148
4.7K
11
10
9
R302 33K C302 102
C201
R201
1N4148
D103
R162
1 47K
2
3
6
7
8 R303 33K C303 102 R307 68 C306
+
R417
C3199Y
R418
5.6K
5.6K
Q401
R410
C418 +
C420
C421
R114 OUT AM VDD 4.7 R203 2.2K IF OUT SD LW TNR201 YC-AM001 C203 22K 3.3K AM OSC 102 VT LOC AM ANT GND C206 103 223
+
C419 +
ZD5.1V
R430
1N4148
680K
R413
4.7K
6.8K
D401 C403 1N4148 104 R221 A105M Q201 A105M Q202 104
10K R403 R405 5.6K
100
Q404 A1273Y
Q406 B1366Y
C311 4.7/50
+
R312 12K R308 330K 4
C309 153
47/16
R304 33K C304 102 C307
REW-L REW-R FOR-R FOR-L GND
C202 104
680K
R311
150K
4.7/50
4.7/50
104
C414 104 C415 104 C416 104 C417 104
1K
104
18K
56K
Q409
R408
R420
C423 104
R432
1.2K
DIG GND
47K 47K
7 IC302 LA2000
8 6 5 1/50
R314
1/50
+
SDA
R401
ZD401
D403
100/16
C401
C3199Y
B IN L
C211
R428
R211 47K
8.2K 0.47/50 150K R316
C315
C314
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1/4W1K
100/16 R409 1.2K
2.2K
R315
+
IN L
C405
B IN R
SCL
9 1
R424
2 333
3
C3199Y
Q407 C3199Y
C312
R212
R214
C3199Y
Q402
10K 5.6K
680K
1 CREF
2 VDD
3 GND
4 TREBLE L
5 TREBLE R
6
7 OUT R
8 LOUD R
9 RADIO-R
10 CDC-R
11 TAPE-R
12 LOUD L
13 RADIO-L
14
1K
4.7K
C205
R433 R406
R407
R411
220/16
CDC-L
R523 8.2K
R524
8.2K
IN R
R422
R525 8.2K
8.2K R526
4.7/50
4.7/50
10
102
C424 104
150K
102
D201 1N4148 10K
C412 104
R423
4.7K
R317
C313
IC401 PT2313L
R416 C413
220/10
104
R706 Q408 D2058 R426 330 R707
680 680
+
+
+
R414
C408
C409
C410
C406
R404
223
R415 330
330
F201 K161
C407
C411
+
R159 C209 R208 1.5K R225 R206 2.2M 10K
1/2W2R2 C422 470/16
ZD10VB
ZD404
R427
D516 C3199Y 1N4148 C3199Y Q501
Q502 R517 4.7K
R518 330 2.2
Q702 A1273Y 1N4001
+
104
R158
10K
4.7/50
R704
+
ZD501 ZD6.2B C506 100/16
R703
47K
47K
47K
+
2.7K
47K
W/OUT OIRT
R701 47K
R514
C504
R515
R516
R522
C502
R519
220 4.7K COM1 SEG35 SEG34 SEG33 SEG32 SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25
Q504 C3199Y
47/10
R609
10K C611
+
C617
R705
1/4W1
FRONT ASSíY
SEG34 SEG33 SEG32 SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 SEG1 SEG19 SEG1 COM1 COM2 COM3 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 R521 C616 R605 1/50 22K C601 11 104 C602 104 C606 102 22K C605 102
+
R520
47K
R702
473
Q506 A105M
C3199Y
Q701
1K
D701
C701
R534
Q505 A105M R163 2.7K R207 10K 4.7K ZD502 C508 B4.7V 223
47K
R610
10K
CN601
+
2200/16
AUTO ANT
36 35 34 33 32 31 30 29 28 27 26 25 COM2 COM3 VDD VLCD R901 VLCD1 VLCD2 VSS OSC C902 INHR902 47K CE R903 47K CLK R904 47K DATA R905 47K 39K 37 38 39 40 41 42 43 44 45 46 47 48 24 23 22 21 20 19 18 17 16 15 14 13 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 PERI FRTDO A-GND LE-IN SD-IN KEY-B KEY-A TMODE1 TMODE2 TMODE3 ST-IN
CON601 14-5-0011120
1 1 2 2
R502 100 47K 47K 47K 47K
R601 2.2K R602 2.2K R606
22
4
20
6 9 7 8 5 3 2 18 17 19 24 21 23
ACC B+ BACK UP RR+ RRRFRF+ LR+ LRLFLF+ GND
CH602 FU603 EI-24mm 10A
3
4
R535
R503 R504 R505 R506
5
LCD901 IS09080E00V3
C901
11 10 9 8 7 6 5 4 3 2 1 FRTCE CDCDI ACCIN FINH PCLK VDD1 PDATA FRTCLK CDCDO MU/LED NC 1M 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34
6
12 11 10 9
9 10 11 12
AM OSC FM OSC C110 103 C207 103 GND FM IFIN AM IFIN LPF LW B+
10
FM B+ INCNT R511 DATA CLOCK PERI NC XT R510 10K R533 10K 10K 10K R512 R513
IC503 YC7400
R528 R529 R530
13 12 11 IC502 KIA9256P
C608
102
5
4.7K 4.7K 4.7K 4.7K
16
1
R906
R907
2
2
23 24 25 26 27 28 29 30 31 32 33 NC NC RESET X2 X1 GND0 VDD0 POWER MOTOR F/R UNLOAD XT501 4.5MHz C503 56p TC501 60p
R909 220 SW901 POWER 220
R531 C509 C510
R532
C612
C615
C609
220 SW902 R916 820 V-UP
220 SW903 R915 680 DISPLAY
330 SW904 R914 470 SEL V-DN
390
C507
CN501
LD903 LD902 LD901
LD906 LD905 LD904
LD908 LD907
LD910 LD909
LD912 LD911
LD913
1
IC501 7031 2
3 0.22/50 C501 R508 4.7K
+
SW918 MUTE R927 220
R926
R501
100K
LD914
56p
1N4148 D503 A0 1N4148 D504 A1 1N4148 D505 1N4148 D506 ENCLK 1N4148 FMONLY D507 1N4148 D508 1N4148 D509 ENAUX 1N4148 D510 1N4148 DISFADER
SW908 SW907 SW906 SW905 BAND/DIR/PLAY T-DN/REW T-UP/FF R917 R919 R920 R918 1.2K 2.2K 2.7K 1.5K SW909 SW910 AS/PS/AMS R925 R924 27K SW916 EJECT FUNC 15K SW915 M6 SW911 M1 R923 8.2K SW914 M5 M2 SW912 R922 5.6K SW913
C610
DRAWN
R921 3.9K
DESIGN
CHECKED APPROVED NAME
SCHEMATIC DIAGRAM SC-7400/7400B
A2
LD915
OH SEWOON DATE 2001. 09. 18. MODEL NO
Q503 A1267Y OPTION
R509 470 LD501
SW919 LOUD 1K SW917
M3
D502
R934
R928
220 R929
220 R930
220 R931
220 R932
100 R933
270
M4
Y U
YOUNG CHAMP
DWG. NO
Samsung Electronics
D601
R910
R911
R912
R913
FILTER BOX
FRTCLK FINH FRTCE FRTDO KEY-B GND KEY-A AVDD GND GND ON B+ GND
9 10 11 12
R603 2.2K
15 C603 104
8
8
1 2 3 4 5 6 7 8 9 10 11 12 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12
7
7
R604 2.2K R608 22K
14 C604 104 10 47/10 16 0.1/50 1 25
WAFER6012-12p
4
6
14
3
5
5
6
12 11 10 9
VDD
AM B+
1000/16
4.7K
4.7K
104
+
1
1
+
+
1N5401
15
223 223 1M
1M
2
AVREF AVDD NC MSSENS EVDATA EVCLK CDON GND1 RSENS2 RSENS1 LOAD
473 102
LC75883E
R527
IC601 TDA7381
7
8
13 R607 C607 102 22K
9
6
7
8
4
3
3
4
8
7
6
IC901
12
5
4
3
DECK ASSíY
OUT RR
B OUT R
OUT RF
OUT LR
B OUT L
OUT LF
TAPE-L
OUT L
Q405 R421
472
+
+
8-1
ELECTRONICS
© Samsung Electronics Co.,Ltd. JAN 2002 Printed in Korea Code no. AH68-00061Q