Adcom GTP-506 Service Manual page 22

IC BLOCK DIAGRAM
U116: LB1642
INput logic
1 2 3 4 5 6
U602: UPD78P058
P15/ANI5 1
P16/ANI6 2
P17/ANI7 3
AVss 4
P130/ANO5 5
P131/ANO1 6
AV 7
REF1
P70/SI2/RxD 8
P71/SO2/TxD 9
P72/SCK2/ASCK 10
P20/SI1
11
P21/SO1 12
P22/SCK1 13
P23/STB 14
P24/BUSY 15
P25/SI0/SB0 16
P26/SO0/SB1 17
P27/SCK0 18
P40/AD0 19
P41/AD1 20
7 8 9 10
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
U504: LM2901N
OUT2 1
OUT1 2
Vcc 3
-
IN1(-) 4
IN1(+) 5
IN2(-) 6
-
IN2(+) 7
22
GTP-506
14 OUT3
13 OUT4
12 GND
-
+ +
11 IN4(+)
10 IN4(-)
9 IN3(+)
-
+ +
8 IN3(-)
60 RESET
59 P127/RTP7
58 P126/RTP6
57 P125/RTP5
56 P124/RTP4
55 P123/RTP3
54 P122/RTP2
53 P121/RTP1
52 P120/RTP0
51 P37
50 P36/BUZ
49 P35/PCL
48 P34/TI2
47 P33/TI1
46 P32/TO2
45 P31/TO1
44 P30/TO0
43 P67/ASTB
42 P66/WAIT
41 P65/WR