Heathkit SW-7800 - Logic Levels

Page
116
Heathkit
LOGIC
LEVELS
The
following
chart
lists
logic
levels
at
various
points
in
your
Receiver
for
each
position
of
the
Band
switch,
if
the Receiver
is
operating
properly.
A
logic
0
indicates
0
volt,
while
a
logic
1
indicates
a
voltage
in
the
.6-
to
15-volt
range.
NOTE:
Refer
to
the
Schematic
for
the
location
of
each
test
point
(they
are
not
screened
on
the
circuit
boards)
BAND
SYNTH.
CONTR.
BAND
SWITCH
BOARD
BOARD
BOARD
CONTR.
BOARD
(MHz)
NLKJP
ABCDEF
GHIJKL
XYZ
TP303__TP304
©
00000 000111
101000
100000
0
1
1
00001
901000 101000
010000
0
2
00010
ao1001
101010
001000
0
1
3
00011
a01010
101001
001000
0
1
4
00100
ao1011
101100
000100
0
1
5
00101
001100
101100
000100
0
1
6
00110
001101
101100
000100
0
1
7
00111
001110
101100
000100
°
1
8
01000 001111
010100
000010
1
0
9
01001 010000
010100
000010
1
o
10
01010010001
010100
000010
1
o
11
01011.
010010
010100
000010
1
0
12
01100010011
(010100
000010
ji
0
131101010100
0101000
00010
1
0
14
01110-(010101.-010100
«9.00010
1
0
15
01111-01010:
o10100
000010
1
0
16
10000-010111-011100
000001
0
0
17
10001-11000
011100000001
0
0
18
10010011001
011100
900001
0
0
19
10011011010
011100
000001
0
0
20
10100
11011.
‘011100
000001
0
0
21
10101_-«011100
«011100
000001
0
0
22
10110011101
011100
000001
0
0
23°
10111-«011110-O11100
0.00001
0
0
24
11000011111.
-o11100
000001
0
0
25
11001
100000 011100
000001
0
<0
26 11010
100001011100
000001
0
0
2711011.
100010011100
000001
0
0
2811100100011
011100
000001
o
0
29
11101100100
011100
000001
0
0