NAD C 720BEE Service Manual page 15

uPD16311
MAIN BOARD :IC703
Din
Dout
Serial I/F
CLK
STB
Vdd
R
OSC
Key1
TO
4
Key4
SW1
TO
4
SW4
PIN CONFIGURATION (Top View)
52
1
SW1
2
SW2
3
SW3
4
SW4
5
Dout
6
Din
IC 7
CLK 8
STB 9
KEY1 10
KEY2 11
KEY3 12
KEY4 13
14
Command decoder
Display memory
20bit x 16 word
Timing generator
key scan
key scan memory (4x20)
5-bit latch
LED 1 LED 5
51 50 49 48 47 46
19
15 16 17 18 20
- 15 -
Dimming circuit
20 12
8
8
8
16 8
Vdd Vss Vee
(+5V) (0V) (-30V)
45 44 43 42 41 40
33
28
27
22 25 26
21 23 24
Seg1
Seg12
Seg13/grid16
Grid 1
Grid 8
Seg20/grid9
39
Grid6
38
Grid7
37
Grid8
36
Seg20/Grid9
35
Seg19/Grid10
34
Vee
Vdd
32
Seg18/Grid11
31
Seg17/Grid12
30 Seg16/Grid13
29 Seg15/Grid14
Seg14/Grid15
Seg13/Grid16