Epson LQ-2550 Technical Manual page 278

4A 30
1A 2A 2B
Figure A-34. 7400 Pin Diagram
7 74123
Figure A-36. 74123 Pin Diagram
5A
G{ 4A
Figure A-38. 74365 Pin Diagram
INPUTA 2
OUTPUT A 3
INPUT Bf 4
5
C U T P U T B 6
7
Figure A-40. 75188 Pin Diagram
3A
3A 3
Y
13 INPUT D!
9 I N P U T C2
8 O U T P U T C
A-33
6 6Y
A
Figure A-35. 7405 Pin Diagram
.18 74175
16
I I
10
Figure A-37. 74175 Pin Diagram
80 70 60
Figure A-39. 74373 Pin Diagram
INPUT A
OUTPUT A
INPUT 8
RESPONSE
C O
NTROL
OUTPUT 8
Figure A-41. 75189 Pin Diagram
REV.-A
36 30
I
.?0
50 50
INPUT D
RESPONSE
CONTROL D
OUTPUT D
INPUT C
RESPONSE
O T P C
U UT