30
74LS273
U6
Timer
U14
Timer
U15
B
A
C
D
E
F
G
H
DATA N
____
FIRE
______
PINSTB
18
ULN2003
U17
5
11
10
3
6
3
4
Q3
D7
+30v
-30v
-30v
+30v
Q4 – Q12 TYP.
D8 – D16 TYP.
100
s
200
s
300
s
0
5v
0v
5v
0v
0v
5v
0v
5v
5v
0v
0v
+30v
0v
-30v
0v
+30v
-30v
FIG 4.2 PRINTHEAD DRIVE CIRCUIT
A
B
D
C
E
G
H
F
U18 - 10
U14 - 2
U14 - 3
U15 - 3
U17 - 4
U15 - 5
Q9 COL
(TAB)
Q3 DRAIN
(TAB)