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DISASSEMBLY INSTRUCTIONS
CABINET UPPER
CASE
REMOVAL
POSITION TIME
SENSOR
(PTS)
REMOVAL
Remove
paper feed knob.
Remove
printer
lid.
Remove
two
screws
holding
upper
case.
Disconnect
control
panel con-
nector
and remove upper
case.
Unsolder
four wires
from
the
PTS
Sensor
board.
Remove
one screw
holding
PTS
Sensor
to
Carriage
Motor assembly.
Remove PTS
Sensor from
Carriage Motor.
POWER
SUPPLY
BOARD REMOVAL
TIMING BELT
MOTOR REMOVAL
Disconnect
power
transformer from
Power
Supply board
and remove
one screw
holding
board
and one screw
holding
ground
lead of
power
cord
and remove
the
Power
Supply
board.
MAIN
BOARD REMOVAL
Disconnect ground Connector FG, Connector CN2,
and
the
Printer
Mechanism
ribbon
cable.
Remove
three
screws
holding
Main
board
to
cabinet bottom.
Remove
two screws
holding heat sink
to
cabinet bottom.
Push back two
plastic
retaining
tabs
and remove Main
board from
cabinet.
Remove
the Printhead.
Refer
to
Printhead removal.
Re-
move
wire
tie
from Timing
Belt
Motor
wires.
Remove
four
screws
holding
Timing
Belt
Motor
to chassis.
Unsolder
the
six
Timing
Belt
Motor
wires
from
terminal
board
located
under
Carriage
assembly. Timing
Belt
Motor
may now
be
removed.
PAPER FEED
MOTOR REMOVAL
Unsolder
the
six
Paper Feed Motor
wires
from
terminal
board
located
under
Carriage
assembly.
Remove
two
screws
holding
Paper Feed Motor
to
Carriage
assembly and
remove
motor.
PRINTER
MECHANISM REMOVAL
Disconnect
printer
mechanism
ribbon cable
from
main
board.
Remove
two screws
holding the
mechanism
to
lower
case assembly.
Remove
one screw
on
right
hand
side
of
paper feed
motor
holding
ground
strip.
Slide
mechanism
forward
and remove from
unit.
PRINTHEAD
REMOVAL
Slide
Printhead
to
left
of
carriage
to
allow
access
to
Print-
head
Cable.
Disconnect
Printhead
Cable by
pulling
the
plastic
tab attached
to
bottom
of
Printhead Cable.
Slide
Printhead
to
center
position
for
access
to
Head
Lock
Lever.
Rotate
lever
left
to release
Printhead.
Lift
Printhead
straight
up
to
remove
from
Carriage
assembly.
HOME
POSITION
SENSOR REMOVAL
Unsolder
three
Home
Position
Sensor
wires
from
Printhead
Connector
board.
Remove
one screw
holding
Home
Posi-
tion
Sensor
to chassis.
Remove
Home
Position
Sensor.
PAPER END
ASSEMBLY REMOVAL
Unsolder
two
wires
from Paper
End
assembly.
Unhook
Paper
End
lever
spring
from
outer
paper
guide.
Bend
back
metal tabs holding Paper
End
ciruit
board
and
remove.
TIMING BELT
REMOVAL
Remove
Printer
mechanism
from
case.
See Disassembly
In-
structions.
Press
downward
on
the
Timing
Belt
at
each
side
of
the point
where
belt
is
attached
to
Carriage
Assembly.
CAUTION:
Belt
may
be
held
in
place with adhesive
cement.
If
removal
is
difficult,
slide
the Carriage
Assembly
to
the
right
and
over the
access
hole
in
the chassis base.
Turn
the
chassis
over.
Carefully cut the
adhesive
seal
with
a
razor
blade
and remove
the
belt
from
the Carriage
Assembly
with
needle-nose
pliers.
Loosen
the
screw
securing the
Belt
Tension
Plate
and
remove
the
Timing
Belt
from
the
belt-driven pulley.
Remove
Timing
Belt
Motor from
the
Printer
base
for
access
to
the
belt
drive pulley.
Remove
belt
from
pulley.
Push
belt
through opening
in
right
frame and
remove
belt
from
Printer.
Install
replacement by
reversing the
removal procedure.
Before
adjusting tension, apply a
drop
of
adhesive
cement
where
Timing
Belt
is
attached
to
Carriage
Assembly
and
allow
to
dry.
See
Timing
Belt
Adjustment
in
Miscellaneous
Adjustments.
32
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