Epson FX-80 Technical Service Data page 43

MECHANICAL REMOVAL
AND REPLACEMENT
RIBBON CARTRIDGE REPLACEMENT TIMING BELT
REPLACEMENT
Slide
Carriage
Assembly
to center.
Move
Scale
(5-28)
to up-
permost
position.
Turn knob on replacement Ribbon
Car-
tridge
counterclockwise
to tighten ribbon.
Install
Ribbon
Cartridge with the
two
tabs
at
each end
fitting
into
the
two
slots of
each
side
frame and
the cartridge seated
on
the
Ribbon
Driving
Gear
(7-3).
Do
not force
it
into place. Care-
fully slide
Ribbon between
Printhead
(5-1)
and Ribbon Mask
(5-16).
Slide Carriage
Assembly back and
forth to verify pro-
per
Ribbon movement.
PRINTHEAD/RIBBON MASK REMOVAL
Remove
Platen Cover,
Printer Lid
and Ribbon
Cartridge.
If
Printer
has been
operating, allow Printhead
(5-1)
to cool.
Slide
Carriage
Assembly
to
the
left
end
of
Carriage Shafts
to
allow
access
to
Head
Cable and Head Cable Connector
on
the Terminal
Board
(8-1).
Hold Connector
in
place and
carefully
remove
the
Head
Cable from
it
by
pulling
on the
plastic tab
beneath
the
Head
Cable.
Slide Carriage
Assembly
to
the center position
for
access
to the
Head
Lock
Lever
(5-13).
Rotate
the lever to the
left
to
release the Printhead.
Lift
Printhead
straight
up
to
remove
from Carriage Assembly.
Remove
the
two
positioning
screws
holding Ribbon
Mask
(5-16)
and
lift
mask
from Carriage Assembly.
Reverse
the
procedure
for
replacement.
See
Printhead Ad-
justment
in
Miscellaneous Adjustments.
CARRIAGE
MOTOR/POSITION-TIME
(PTS)
SENSOR
REMOVAL
Remove
upper case. See Disassembly
Instructions. Dis-
connect Connector
CN4
from
FMBD
Board.
Remove
left-
front
screw and
right-rear
screw from base
of Carriage
Motor
(2-1).
Lift
motor assembly
out
of Printer base.
Free
the
motor
wire
harness and
separate the Carriage
Motor
and
Position-Time Sensor
wires.
Remove
Printer
mechanism
from
case.
See Disassembly
In-
structions. Press
downward
on
the
Timing
Belt
(4-1)
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
(4-5)
and
remove
the
Timing
Belt
from
the belt-driven pulley.
Remove
the
left-front
screw and
right-rear
screw from
the Carriage
Motor
(2-1).
Lift
the
motor assembly
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.
Be-
fore
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.
BELT TENSION PLATE REMOVAL
Remove
upper
case.
See Disassembly
Instructions. Slide
Carriage
Assembly
all
the
way
to the
right.
Loosen
the nut
on each end
of
the
front
Carriage Shaft
(5-17).
Remove
the
left
end
of
the Carriage Shaft from
the side frame.
Remove
the
adjustment screw from
the
Belt
Tension
Plate
(4-5)
and
lift
the Timing
Belt
(4-1)
from
the belt-driven pulley.
Lift
the
Tension
Plate
up and
out of
the
Printer
base
with ribbon
driving gears
intact.
Reverse
the procedure
for
replacement. See Timing
Belt
Adjustment
in
Miscellaneous Adjustments.
PAPER FEED MOTOR/TRANSMISSION GEAR
REMOVAL
Remove
the
screw
holding the Position-Time
Sensor Board
(3-7)
to
the
motor base and remove Sensor Board from
Car-
riage
Motor
heat
sink.
Remove
right-front
screw and
left-
rear
screw from
the motor base
to
remove
the Carriage
Motor and Sensor
Disk from the heat
sink.
Reverse the procedure
for
replacement. See PTS Sensor
Board Adjustment
in
Miscellaneous Adjustments.
HOME
POSITION
SENSOR REMOVAL
Remove
Platen Cover,
Printer Lid
and Ribbon
Cartridge.
Slide
Carriage
Assembly
to
the
right
end
of Carriage Shaft
to
access
the
Home
Position
Sensor Connector on
the
Ter-
minal Board
(8-1).
Disconnect Connector and remove screw
holding
Sensor
Board.
Lift
Sensor Assembly
out of Printer
base.
Reverse
the
procedure
for
replacement. See
Home
Position
Sensor Adjustment
in
Miscellaneous Adjustments.
Remove
Upper case.
See Disassembly
Instructions. Dis-
connect Connector
CN4
from
FMBD
Board.
Remove
three
screws from base
of
Paper Feed Motor
(2-3).
Remove
motor
from chassis
side frame. Free the
motor
wire harness
and
separate Paper Feed Motor wires from harness.
Pull
Trans-
mission
Gear
(5-3)
straight
out from
side
frame and
off of
gear
shaft
pin.
Retain thrust
washer used on
inner side
of
gear.
Reverse the procedure
for
replacement. Slide
motor up
to
minimize gear
lash but
do
not lock
up
gears.
Perform
self-
test to
check
proper paper
advancement.
SCALE/PAPER
HOLDING LEVERS
REMOVAL
Remove
upper case.
See Disassembly
Instructions.
Re-
move
two screws holding Platen Cover
(6-2).
Carefully
lift
cover
backward and upward
to clear the lever
on
the
Paper
Empty
Sensor.
Loosen
the
screws
at
the
end
of
the Scale
(5-28).
Remove
the E-rings
and
Springs
(5-23)
from the Paper
32