NAD T753, Service Manual

Page: 50 / 80

50
HCF4094B
KEYBOARD: U204~U207 & U211
SERIAL
IN
CLOCK
STROBE
LATCH 1
3-STATE
1
OUTPUT
ENABLE
2
SERIAL
OUT
Q'
S
10
SERIAL
OUT
Q
S
9
15
1
D Q
CL
CL
3 CL
CL
1 CL
CL
2
D Q
CL
CL
LATCH
2
TR
TR
LATCH
3
TR
TR
3-
STATE
2
3-
STATE
3
3
D Q
CL
CL
Q
STAGES
3 - 7
2 2 2 2 2 2 2 2
Q3 Q2 Q1
VSS VDD
Q7 Q8 Q6 Q5 Q4
CL
CL
CL
CL
p
n
TL
TL
p
n
p n
TL TL
p n
p
n
VDD
VSS
PCB
44
45
43
37
36
41
38
RDIO
BK
LATB
LDIO
RDIN
RDOUT
LDIN
LDOUT
DIR
CLK
SQ1
SQ64
QB1
HVO1
HVO23
G
QB23
DIRECTION
CONTROL
UNIT
SHIFT
UNIT
LATCH
UNIT
DIR
RDIO
LDIO
DIR
CLKB
QB24
HVO24
HVO41
G
QB41
LATCH
UNIT
51
73
82
99
QB42
HVO42
HVO64
G
QB64
LATCH
UNIT
08
30
VDD2 02
31
50
79
VSS2 05
34
47
76
PT6306
KEYBOARD: U203