Sony STR-DH520 Service Manual page 44

STR-DH520
IC2805 TC74VHC08FT (EL) (DIGITAL BOARD (3/4))
A0 VCC
1 14
B0 A3
2 13
Y0 3 12 B3
A1 4 11 Y3
B1 A2
5 10
Y1 B2
6 9
GND 7 8 Y2
IC100 PT6315 (DISPLAY BOARD)
44 43
SW1 1
2
SW2
SW3 3
SW4 4
OSC OSC
5
DOUT 6
DIN 7
Serial
interface
CLK 8
STB 9
KEY1 10
11
KEY2
12 13
44
42 41 40 39
Grid driver
Command decoder
Display memory
24 bits x 12 words
Timing generator
key scan
Key data memory
(2 x 16 bits)
14 15 16
38 37 36 35 34
Multiplexed driver
segment driver
17 18 19 20 21 22
GRID10
33
32 GRID11
SEG17
31
30 VEE
29 SEG16
28 SEG15
27 SEG14
SEG13
26
SEG12
25
24 SEG11
23 SEG10