SERVICE MANUAL
Document No
Date of Origin
Date of REV
51-L-DSR004
98-10-21
PAGE REV.
0
PAGE
85 /102
S-00-005(96.03.27)
REV.1
4.8
MODEM INT
SAMSUNG ELECTRO-MECHANICS CO., LTD
A2
7
16
Friday, October 16, 1998
SEMCO-BSKYB
Title
Size Document Number
Rev
Date:
Sheet of
5VM
5VM
5VD
12V
5VM
5VM
5VM
5VM
5VM
5VM
5VM
5VM
5VM
12V
5VM
5VM
SRAM 32K*8
FLASH 128K*8
MODEM_D0
MODEM_D0
MODEM_D1
MODEM_D2
MODEM_D3
MODEM_D4
MODEM_D5
MODEM_D6
MODEM_D7
MODEM_D0
MODEM_A0
MODEM_A0
MODEM_A1
MODEM_A2
MODEM_A0
MODEM_A1
MODEM_A2
MODEM_A3
MODEM_A4
MODEM_A5
MODEM_A6
MODEM_A7
MODEM_A8
MODEM_A9
MODEM_A10
MODEM_A11
MODEM_A12
MODEM_A13
MODEM_A14
MODEM_A3
MODEM_A4
MODEM_A5
MODEM_A6
MODEM_A7
MODEM_A8
MODEM_A9
MODEM_A10
MODEM_A11
MODEM_A12
MODEM_A13
MODEM_A14
MODEM_A15
MODEM_A16
A2
A3
A4
/MEMRD
/MEMBE3
MODEM_A15
MODEM_A16
MODEM_D1
MODEM_D2
MODEM_D3
MODEM_D4
MODEM_D5
MODEM_D6
MODEM_D7
D0
D1
D2
D3
D4
D5
D6
D7
/MEMBE2
/MEMBE0
/MEMBE3
/MEMBE0
/MEMBE0
/MEMBE2
A2
D0
D1
D2
D3
D4
D5
D6
D7
MODEM_D1
MODEM_D2
MODEM_D3
MODEM_D4
MODEM_D5
MODEM_D6
MODEM_D7
MODEM_A1
MODEM_A2
MODEM_A3
MODEM_A4
MODEM_A5
MODEM_A6
MODEM_A7
MODEM_A8
MODEM_A9
MODEM_A10
MODEM_A11
MODEM_A12
MODEM_A13
MODEM_A14
MODEM_A15
MODEM_A16
U302
IS28F010
D0
13
D1
14
D2
15
D3
17
D4
18
D5
19
D6
20
D7
21
A0
12
A1
11
A2
10
A3
9
A4
8
A5
7
A6
6
A7
5
A8
27
A9
26
A10
23
A11
25
A12
4
A13
28
A14
29
A15
3
A16
2
WE
31
CS
22
OE
24
VCC
32
VPP
1
NC
30
GND
16
C310
104
C303
104
C308
104
C311
104
C309
10U
+
C312
10U
+
BD300
BC3560
C302
104
C301
10U
+
C326
104
C339
104
C341
104
C333
10P
C335
15P
C331
1N/1KV
C337
1N/1KV
C321
104
C340
10U
+
C338
10U
+
V300
10D471K
1
2
L302
10uH
1
2
R362
120K
R363
20K
R356
100
X301
56.448MHz
L303
4.7uH
1
2
L300
10uH
1
2
R349
10K
R313
100
X300
56.448MHz/s
L301
4.7uH
1
2
C314
104
C315
104
C316
104
R335
NC
U301
IS61C256-20J
A0
12
A1
11
A2
10
A3
9
A4
8
A5
7
A6
6
A7
5
A8
27
A9
26
A10
23
A11
25
A12
4
CE
22
OE
24
WE
29
D0
13
D2
15
D3
17
GND
16
D5
19
D6
20
D7
21
A13
28
A14
3
VCC
32
D1
14
D4
18
A15
31
A16
2
CE2
30
NC
1
U300
R6741-28
HINT
12
HD0/DSR
13
HD1/CTS
14
HD2/RLSD
15
HD3/DRSD
16
HD4/AA
17
HD5/RI
18
HD6/TM
19
HD7/RDL
20
D0
54
D1
55
MUTE/CXLI
1
D2
57
D3
58
D4
60
D5
65
D6
66
D7
67
A0
70
A1
71
A2
72
A3
73
A4
74
A5
75
A6
76
A7
77
A8
78
A9
79
A10
80
A11
81
A12
3
A13
4
A14
5
A15
6
A16
9
READ
46
WRITE
47
RAMSEL
11
ROMSEL
10
MIC_M
33
MIC_V
32
SPK_V/SPK_M
27
TELIN/PE3
25
TELOUT/PE2
26
LCS
48
RINGD
53
VOICE
8
OH
7
SVDRES/CKTTL0
2
XTLI
63
XTLO
64
RESP
45
HCS/DTR
22
HRD/RTS
42
HWT/AL
41
NVMDATA
49
NVMCLK
52
HA0/DTRI
21
HA1/RXD
51
HA2/TXD
43
RIN
34
TXA1
28
TXA2
29
CALLID
VREF
30
VC
31
IAVDD2
36
IAGND3
39
IAGND2
35
IAGND1
24
VDD1
83
VDD2
50
VDD3
37
GND1
40
GND2
44
GND3
56
GND4
59
GND5/DSVD_IRQ
62
GND7
84
GND8/DSVD_CS
82
GND6/PLLGND
69
VDD5/PLLCAP
68
VDD4/PLLVDD
61
IAVDD1
23
TP302
TP300 TP301
R300
NC
R301
100
R302
100
R303
100
R304
100
R305
100
R306
100
R307
100
R308
100
R309
100
R310
100
R311
100
R326
100
R329
100
R331
100
R337 100
R338 100
R339 100
R340 100
R341 100
R342 100
R343 100
R344 100
R346
100
R348
100
R350
100
R351
100
R352
100
R355
100
R357
100
R321
NC
R360
15K
R364
4.7K
R345
620K
R353
68K
R347
68K
R358
2K
C329
1U
C330
1U
C332
1U
TP304
TP306
TP307
TP303
TP305
TP308
R312
10K
R361
10K
R314
10K
R366
0
R320
20K
C317
104
R365
1K
R367
100
R333
240K
C305
15P
R327
1K
R328
10K
C319
470N
R332
10K
C318
10U
+
R323
5.1K
U303B
KA358
+
-
5
6
7
4
8
U303A
KA358
+
-
3
2
1
4
8
U304A
KA393
+
-
3
2
1
4
8
R322
20K
R319
20K
R324
20K
R325
10K
D300
RLS4148
D301
RLS4148
R318
NC
U305
R6715-13
D0
7
D1
6
D2
5
D3
4
D4
3
D5
2
D6
1
D7
68
GP08
22
RESET
23
IARESET
44
CS
11
RS0
67
RS1
66
RS2
65
RS3
64
RS4
63
READ
12
WRITE
8
MICIN
31
SPKP
38
SPKN
36
LINEIN
33
LINEOUT
35
IRQ
21
GP17
59
IACLK
10
MCLK
45
ICLK
40
IA1CLK
54
VCC1
13
VCC2
27
VCC3
47
AVDD
34
GP15
15
GP14
16
GP13
17
GP12
18
NC2
19
NC3
37
NC4
41
NC5
42
SR3 IN
28
SOUT
49
NC6
58
NC7
60
NC8
61
AVSS
32
VSS1
9
VSS2
20
VSS3
26
VSS4
29
VSS5
46
VSS6
51
VSS7
62
NC1
14
XTLI
24
SIN
48
SR4OUT
57
XTLO
25
SR1IO
56
CTRLSIN
50
VREF
53
REFCNTL
43
FSYNC
39
SA1CLK
55
AGD/VC
52
RBIAS
30
C304
10U
+
C325
10U
+
C322
104
C334
10P
C323
104
C313
10U
+
C320
10U
+
C327
10U
+
C306
10P
C307
10P
C328
104
R359
2K
C342
10U
+
R354
0
C324
104
R334
NC
R336
0
R330
0
U306
MH88435AS-P
TIP
28
RS
13
LOOP
11
NB1
1
NB2
2
RING
27
AGND
8
VBIAS
10
ZA
7
LC
6
/LCD
15
/RV
16
VR+
3
VR-
4
VX
5
VDD
9
VLOOP1
25
VLOOP2
24
VLOOP3
23
VLOOP4
22
VLOOP5
21
Q300
KST2222AL
TP309
C300
104
C344
104
R370
22/3225
R369
22/3225
R371
1K
R372
NC
R373
0
TJ300
RJ11-4/4
P1
1
P2
2
P3
3
P4
4
D[0..31]
/RESET_IC
/MODEM_CS
/MEMRD
/G729_CS
/MEMBE[0..3]
A[2..23]
SPKP
G729_INT
HINT
TXA1
TXA2
RXA
/RST
RXA
TXA1
TXA2
PPD
LOOP
VBIAS
VBIAS
LOOP
LCD
LINEOUT