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PRELIMINARY SERVICE
CHECKS
(Continued)
GENERAL OPERATING
INSTRUCTIONS
PRINTER
STATUS
(SW1)
ANI
SW1
On
5
LINE
FEED STATUS
(SW2)
Off
1
2
Compressed
Graphics Character Set
Not
Compressed
Control
Codes
3
4
Beeper
Off
12-inch
Form
Beeper
On
11
-inch
Form
5
6
Paper Out Sensor
Off
USA
Paper
Out Sensor
On
(International
Character
7
USA
8
USA
SW2
On
Set)
(International
Character
Set)
(International
Character
Set)
Off
1
Slashed Zero
Regular Zero
2
Printer
Select
On
Printer
Select Off
3
Auto
Line
Feed
with
4
Carriage Return
One
inch
Skip
Over
Perf
Line
Feed from Host
Normal (No
Perf)
PRINTER SELF-TEST
To
use
the
built-in
self-test
function, put
paper
in
the
printer
and
hold
down
the
LF
(Line
Feed) button while
turning
On
the
printer.
ON
LINE,
FF
AND
LF
BUTTONS
Printer
is
On
Line
(Ready
to
receive
data
from
the
computer)
when
all
three given
LED's
are
On.
The
printer
is
Off Line
when
only the top
green
LED
is
On.
Pressing the
On
Line button
once
puts the
printer
Off Line
and
pressing
it
again puts the
printer
back
On
Line.
The
printer
must
be
Off Line
for
the
FF
(Form
Feed)
and LF
(Line
Feed) buttons
to function.
MISCELLANEOUS ADJUSTMENTS
PTS (HEAD
POSITION)
SENSOR ADJUSTMENT
Connect Channel
A
of
a dual
trace
scope
to pin
10
of IC
9D
and
set
the
horizontal
sweep
time
to
.5mSec. Set the
scope
to trigger
on
the
positive
edge
of
the
waveform. Hold
down
the
LF
button while
turning the
Printer
On
to activate
the
self
printing test
mode. Loosen
the
screw
holding the
PTS
(Position
Timing
Signal)
Sensor Board on
the
right
side
of
the
Timing
Belt
Motor
(M2).
Use
a screwdriver
in
the
slot
provided
to
adjust the
PTS
Sensor Board
for
a
pulse width
of
approximately
1.67mSec
while the
Printer
is
in
the
self
printing test
mode. See
Figure
1.
1.67
mSec
Figure
1
HOME
POSITION
SENSOR ADJUSTMENT
Loosen
the
screw
holding the
Home
Position
Sensor
Board.
Use
a small
flat
screwdriver
in
the
notch provided
to
adjust
the
Home
Position
Sensor
Board.
Move
the
notch
to
the
left
to
move
the
margin
left
or
move
the
notch
to
the
right
to
move
the
margin
right. Install
the
Ribbon
Cartridge
and
per-
form
the
self
printing test to test
the
margin
position.
Re-
peat
this test
until
printing
begins
at
the desired position
on
the paper.
When
the desired position
is
obtained, tighten
the
Home
Position
Sensor Board mounting
screw.
TIMING BELT
ADJUSTMENT
Loosen
the
adjustment screw on
the
belt
tension
plate.
Tighten the
belt until
no
more
than
1/4
inch
movement
oc-
curs
on
the Printhead
when
it
is
at
either
end
of
the carriage
shaft
and
the
belt
is
pressed
inward.
Tighten the
adjust-
ment screw on
the
belt
tension
plate.
Run
the
Printer
in
self-test
mode
and
note the distance
between
characters.
The
distance should
be
the
same.
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