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Fig. 4.2 Printhead Drive Circuit
D
S
D
S
D
S
C
O
I
L
U13
Timer
U5
RCLK
SRCLR Q
Q
26 TYP.
D23 TYP.
Q8
Q
7
D6
Q5
Q4
U12
6
3
15
12
10
+38VDC
D34
D35
FIRE
NO CHOP
FIRE EXT
FIRE
NO CHOP
FIRE EXT
U5 PIN 15
U13 PIN 3
Q7 SOURCE
Q26 DRAIN
COIL
CURRENT
50V --
-- 70V
-- 38V
(dashed lines are for revision F and later boards)
26