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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.
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.
28
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