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LOGIC
CHART
(Continued)
PIN
IC
IC
IC
IC
IC
IC
NO
4D
50
60
7D
8D
9D
1
P(4)
P
H
P
L(1)
H
2
L
P
P
P
L(1)
L
3
P(4)
P
P
H
H
H
4
L
H
H
H
H
L
5
PCI)
L
P
H
P(4)
H
6
P(2)
H
P
H
P(1)
L
7
L
L
L
L
L
L
8
H(2)
PC2)
L
P(1)
LCD
P(2)
9
L(1)
H
H
P<1)
L(1)
P(1)
10
L
H
H
P
H(2)
P(2)
11
H
L
P(1)
P
H(2)
P(1)
12
L
H
H
P
H(2)
L
13
H
H
H
P
H(2)
H
14
H
H
H
H
H
H
15
16
NOTE:
Logic
probe
readings taken with
Printer
On
Line
and
in
self-test
mode
unless otherwise noted.
Switches
SW1
and
SW2
set
as
shown
on
schematic.
Logic
Probe
Display
L
=
Low
H =
High
P
=
Probe
*=Open
(No
lights
On)
(1)
Probe
indicates
H when
printhead
is
at
home
position.
(2)
Probe
indicates
L
when
printhead
is
at
home
position.
(3)
No
indication
when
printhead
is
at
home
position.
(4)
Probe
indicates
P
during
line
feed.
(5)
No
logic
reading taken.
14
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