Figure 4: Display Board Schematic Layout - SPHINX Project Eight Service Manual

SPHINX Project Eight
CL
EN
C7
R5
VCC
68K1
3U3/63V
D1
1N4148
RES
P65
J1
U2
MAX690
R1 R2
VCC
27K4 10K0
NORMAL JUMPER SETTINGS
JUMPER CLOSED
J1
J2
J3
TO MAINBOARD UCN'S
CN1
18PIN
61
P30
62
P31
63
P32
64
P33
65
P34
66
P35
67
P36
68
P37
1
nc
2
P60
3
P61
4
P62
5
P63
6
P64
7
P65
8
P66
9
RES
C4
VCC
220n
C2
U3 33p
8M
C1
33p
OPEN
X
X
X
Service Manual

Figure 4: Display Board Schematic Layout

CN2
20PIN
C9
VCC 470U/16V
EN CL
U1
43
P27
42
VCC VCC
41
P77
40
P76/RD
39
P75/WR
38
P74
37
P73
36
P72
35
nc
34
P71
33
P70
32
P55
31
P54
30
P53
29
P52
28
P51
27
P50
H8/325
J2
S2
A -
B +
ENCOD
S5
1 2
S4
1 2
S3
1 2
S1
B +
A -
ENCOD
C8
C47U/16V
R3 R4
VCC
5R62 61K9
IR1
IR- receiver
IRIC
TO VFD-DISPLAY
VCC
J3
P65
U4
93C46
C5
220n
VCC
C3
220n
VCC
VCC
C6
220n
RES
15