Epson FX-80 Technical Service Data page 44

MECHANICAL REMOVAL AND REPLACEMENT
(Continued)
Holding Lever Assembly.
Lift
up
the Scale
and
Paper
Holding Levers
to
remove them
from
the side frames.
Keep
the two
Lever Springs
(5-21) (5:26)
released
at this point with
the assembly. Reassemble
in
reverse order.
FRICTION/SPROCKET PLATEN REMOVAL
Perform Paper Feed
Motor/Transmission Gear Removal and
Scale/Paper Holding Levers Removal
procedures.
Remove
the nuts on
the
ends
of
the Sprocket Guide
Shaft
(5-3).
Re-
move
the
E-ring
from
the
left
shaft end
of
the Platen
Assembly
(5-2).
This
will
release the
Left
Bearing
(5-4), flat
washer and
thrust washer.
Push
the Left Bearing outward
and
slide the Platen
Assembly
toward the
right.
When
bear-
ings are clear
of side frames,
lift
Platen
Assembly
out of
chassis.
To remove
Left
Sprocket Assembly
(5-6),
slide
the
assembly
off
the
left
end
of the Platen
Assembly
and Sprocket Guide
Shafts.
To remove
Right Sprocket Assembly
(5-7),
remove
the Spring Pin
(SP) holding the Platen Gear
(5-3),
plain
washer,
leaf spring,
Spacer
(5-5)
and
Right Bearing
(5-4).
Slide the assembly
off
the
right
end
of the Platen
Assembly
and Sprocket Guide
Shafts.
TRACTOR REMOVAL
Remove
seven screws
holding
tractor to cabinet bottom.
Disconnect Connectors CN4,
CN5
and
CN8
from
FMBD
Board.
Lift
tractor
assembly
from
cabinet bottom.
PAPER EMPTY
SENSOR REMOVAL
Remove
upper
case.
See Disassembly
Instructions. Dis-
connect Connector CN8
from
the
FMBD
Board and
free
wires from
restraining
hook
next
to
Sensor. Release Spring
(3-2)
and
carefully
bend back
the holding tab
at
lower edge
of
Sensor
board.
Lift
board from
the
Paper Guide
Assembly. To remove
the Sensor
Lever
(3-1),
remove
the
E-ring
and
Shaft
(3-3)
from
the
lever.
Reassemble
in
reverse
order.
GENERAL
OPERATION
BUZZER TONE CHECKS
Switch
Printer
On
and
listen for
one
of
the following
pat-
terns of tones: Three
short
tones
and one
long
tone
will
in-
dicate
an
overvoltage detection. Refer
to
"Power
Supply"
section
of
the Troubleshooting
guide.
Three
short
tones repeated twice
indicates a Printhead (HD)
malfunction.
Check
to
see
if
the
head
cable
is
loose or the
Printhead
is
not seated
firmly
on
the carriage
assembly.
Four
long tones
indicates
one
or
more
of the Printhead
Driver Transistors (Q6 Thru Q14)
is
shorted, or Printhead
is
damaged. Replace and
inspect
again.
Five short
tones repeated
five
times
indicates paper
empty
signal.
If
this signal
sounds when
the
Printer
is
loaded with
paper,
check
to
see
if
paper
is
inserted correctly
between
the
lever
and
switch
of
PE
sensor.
X
z
oo
o
DISASSEMBLY INSTRUCTIONS
UPPER CASE REMOVAL
Remove
the
brown
plastic platen cover, the paper separa-
tor,
the
Printer
lid,
and the ribbon
cartridge.
Remove
the
paper
feed
knob and
four
screws from
cabinet
top.
Lift
cabinet top
up and
lay
it
over to the
right
side
being
careful
not
to
dislodge the control panel connector.
CONTROL PANEL REMOVAL
move
one
grounding screw
(for
AC
power
cord)
from chas-
sis. Lift Filter
board and power
cord retainer from cabinet
bottom.
FMBD BOARD REMOVAL
Disconnect
all
connectors from
FMBD
Board.
Remove
four
screws
holding
FMBD
board
to
cabinet bottom. Release
two
plastic clips
and remove
board from
cabinet.
Disconnect Connector
CN7
from
the
FMBD
board. Release
two
plastic clips holding Control panel to cabinet top
and
remove
Control panel through cabinet
top.
FILTER
BOARD REMOVAL
Disconnect Power Transformer Connector
CN1
from
Filter
board.
Remove
one screw
holding board
at the center. Re-
PRINTER
MECHANISM REMOVAL
Remove
seven screws
holding
Printer
Mechanism
to
cabinet bottom.
Disconnect Connectors CN4,
CN5
and
CN8
from
FMBD
Board.
Lift
Printer
Mechanism
from
cabinet bottom.
33