Samsung Msys 6800 Service Manual page 109

Schematic Diagrams
Main Circuit Diagram(2/5)
A(0:21)
D(0:15)
10-2
U13
16 45
A(18) D(15)
A18 D15
17 43
A(17) D(14)
A17 D14
A(16) 48 41 D(13)
A16 D13
A(15) 1 39 D(12)
A15 D12
2 36
A(14) D(11)
A14 D11
3 34
A(13) D(10)
A13 D10
4 32
A(12) D(9)
A12 D9
5 30
A(11) D(8)
A11 D8
A(10) 6 44 D(7)
A10 D7
A(9) 7 42 D(6)
A9 D6
A(8) 8 40 D(5)
A8 D5
18 38
A(7) D(4)
A7 D4
19 35
A(6) D(3)
A6 D3
20 33
A(5) D(2)
A5 D2
21 31
A(4) D(1)
A4 D1
22 29
A(3) D(0)
A3 D0
23
A(2)
A2
24 37
A(1) A1 VCC
25
A(0) R110
A0
10K
47
_BYTE
9
NC1
10 C73
NC2
13 46 100nF
NC3 VSS1
14 27
NC4 VSS2
26
nRCS0 _CE
28 15
nRD _OE _BUSY nSRAMCS
11 12
nWR _WE _RESET
AM29F800B-70EC
VSB
C98
100nF
R143
U19
D7
KIA7045P 10K
RB420D T147
1 3
C111
2
C110
100nF
100nF
C92 C124
100nF 1nF R147
180K
VSB R145
220K
A(0) D(0) A(0)
A(1) D(1) A(1)
A(2) D(2) A(2)
A(3) D(3) A(3)
A(4) D(4) A(4)
A(5) D(5) A(5)
A(6) D(6) A(6)
A(7) D(7) A(7)
A(8) D(8) A(8)
A(9) D(9) A(9)
A(10) D(10) A(10)
A(21) D(11) A(21)
D(12)
D(13)
D(14)
D(15)
VB
nWR
nRD
C100 C104 C113
nD_RAS0 nD_RAS1
100nF
100nF 1 00nF
nD_CAS1 nD_CAS1
nD_CAS0 nD_CAS0
nWR nWR
U20-1
CD74HC08M
nRAS0
nWTD_OUT
R144 10K
nRAS1
C123
10nF
nRESET
10
nCAS0
VB
R146
2
1.5K
1 13
nCAS1
3
Q7
12
KSA1182-Y
R148
820
C125
100uF
16V
D(0)
D(1)
D(2)
D(3)
D(4)
D(5)
D(6)
D(7)
D(8)
D(9)
D(10)
D(11)
D(12)
D(13)
D(14)
VB
D(15)
C99 C103 C112
100nF 100nF
100nF
VB
C109
100nF
14
1
VCC
R138
100
3
nD_RAS0
2
GND
7
4
R139
100
6
nD_RAS1
5
R140
100
8
nD_CAS0
9
R141
100
11
nD_CAS1
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