Epson FX-80 Technical Service Data page 2

SSM S
COMPUTERFACTS
PRELIMINARY SERVICE
CHECKS
-This data provides the user with a time-saving service
tool
which
is
designed
for
quick
isolation
and
repair of printer
malfunctions.
EPSON
MODEL
FX-80
o
oo
z
><
°^
m Q
O
Q.
O
Check
all
interconnecting cables
for
good connections and
correct
hookup
before
making
service checks.
Replacement
or repair
of
the
FMBD
Board,
Filter
Board,
Control Panel or
connectors
may
be necessary
after the
malfunction has been
isolated.
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 withl
paper,
check
to
see
if
paper
is
inserted correctly
between]
the
lever
and
switch
of
PE
sensor.
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
fourl
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.
5/iMS
Howard W. Sams &
Co., Inc.
4300
West 62nd
Street, P.O.
Box
7092, Indianapolis, Indiana
46206
U.S.A.
The
listing of
any
available
replacement
part herein does not
constitute
in
any case a recommendation, warranty
or guaranty by
Howard W. Sams &
Co.
,
Inc.
,
as
to
the
quality
and
suitability of such
replacement
part.
The numbers
of
these
parts
have been compiled
from information furnished
to
Howard W. Sams
&
Co., Inc.,
by the
manufacturers
of
the particular type
of
replacement
part
listed.
Reproduction or use, without express permission,
of editorial
or
pictorial
content,
in
any manner,
is
prohibited.
No
patent
liability
is
assumed
with
respect
to
the use
of
the information contained
herein.
©
1985
Howard W. Sams
&
Co., Inc.
4300
West
62nd Street, P.O. Box 7092, Indianapolis, Indiana 46206 U.S.A.
Printed
in U.S. of
America.
85CP14948 DATE
4-85