Service manual

8-7
March 2000
Part No. 001-3139-502
VOTER SHELF SCHEMATIC
FIGURE 8-4
FOLDOUT
1
3
U3A
74HC04
215
U4B
74HC04
34
15
14
10
11
12
13
6
5
1
2
3
4
9
7
U1A/B
55121
U1B/C
3447
+5V
+5V
10
13
9
11
12
15
14
1
2
U3F
74HC04
710
U4D
74HC04
89
U3B
74HC04
314
U4A
74HC04
2
1
4
2
P40
64
63
62
61
60
59
58
57
56
55
54
53 21
22
23
24
25
26
27
28
29
30
31
32
P39
P38
51 19
2
R14
3
R13
75
15
6
7
8
2
3
4
6
4
14
13
12
11
10
9
8
7
6
5
4
3
2
1
J1
S13
R2
75
15
6
7
8
2
3
4
S2
52 20
49
48
47
17
16
15
45 13
50 18
46 14
-5V -5V
44 12
43 11
42 10
41 9
40 8
39 7
38 6
37 5
36 4
35 3
34 2
33 1
-12V
+12V
+5V
-12V
+12V
+5V
P13
64
63
62
61
60
59
58
57
56
55
54
53 21
22
23
24
25
26
27
28
29
30
31
32
P16
51 19
R1
75
15
6
7
8
2
3
4
S1
52 20
49
48
47
17
16
15
45 13
50 18
46 14
-5V -5V
44 12
43 11
42 10
41 9
40 8
39 7
38 6
37 5
36 4
35 3
34 2
33 1
-12V
+12V
+5V
-12V
+12V
+5V
P2
P17
64
63
62
61
60
59
58
57
56
55
54
53 21
22
23
24
25
26
27
28
29
30
31
32
P14
51 19
52 20
49
48
47
17
16
15
45 13
50 18
46 14
-5V -5V
44 12
43 11
42 10
41 9
40 8
39 7
38 6
37 5
36 4
35 3
34 2
33 1
-12V
+12V
+5V
-12V
+12V
+5V
P1
P15
2
W101
W102
W103
+5V
W100
W104
W105
W106
2
6
4
14
13
12
11
10
9
8
7
5
3
1
J2
2
NOTES:
1. ALL RESISTORS ARE IN OHMS UNLESS OTHERWISE SPECIFIED.
P2 THROUGH P12
P16/P17 THROUGH P36/P37
S2 THROUGH S12 ARE IDENTICAL.
3
THE VDM BUS NEEDS TO BE LOADED AT 75 OHMS. A RESISTOR (R14) IS ADDED
TO EACH SHELF TO PROVIDE A 75 OHM LOAD. THEREFORE, THE NUMBER OF
SHELVES TIMES 75 OHMS EQUALS THE VALUE OF RESISTOR THAT MUST BE
INSTALLED IN EACH SHELF AT LOCATION R14.