PRINTER:
EPSON
S
MX-80
IIIF/T
TECHNICAL
SERVICE
DATA FOR
YOUR
PRINTER
SAMS
COMPUTERFACTS"
EPSON
MODEL
MX-80IIIF/T
PRELIMINARY
SERVICE
CHECKS
o
Z
oo
O X
a
o
a.
O
This
data provides the user
with a time-saving
service
tool
which
is designed
for quick isolation
and repair
of printer
malfunctions.
Check all
interconnecting
cables for
good connection
and
correct
hook-up
before making service
checks.
Replacement
or repair
of the
AC Switch Board,
Control
Board, Driver
Board,
Function Board,
or connectors may
be
necessary
after the
malfunction
has been isolated.
GENERAL
OPERATING
INSTRUCTIONS
PRINT
STATUS
(SW1) AND
LINE
FEED
STATUS
(SW2)
SW1
On
Off
1
Compressed
Normal
2 Not
Used
3
Paper
Out Sensor
On
Paper
Out Sensor
Off
4
Italic
Normal
5 Emphasized
Normal
6 Buzzer
On
Buzzer Off
7
Slashed
Zero
Regular
Zero
8 Select
Fixed
Select
Not Fixed
SW2
On
Off
1 Not
Used
2 Not
Used
3 Auto
Line Feed
with
Carriage
Return
Line
Feed from
Host
4
One Inch
Skip
Over Pert
Normal (No
Skip)
PRINTER
SELF-TEST
To
use the built-in
self-test
function,
put
paper in the
printer and
hold
down the
LF
(Line
Feed)
button while
turning
On
the printer.
ON LINE,
FF AND LF
BUTTONS
Printer
is On
Line (Ready
to
receive
data from
the
computer)
when all
three
green
LED's
are
On.
The printer
is
Off Line
when only
the
top green
LED is
On.
Pressing
the On
Line
button once
puts the
printer Off
Line and
pressing
it
again
puts the
printer
back On
Line.
The printer
must
be Off
Line for
the
FF (Form
Feed)
and LF
(Line Feed)
buttons
to function.
CAM/lC
Howard
W. Sams
& Co., Inc.
Mf'lfn#Tii
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.
© 1984 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.
84CF14916
DATE
5-84
COMPUTERFACTS-OFTHEMONTH
SET NO.
CF2 FOLDER
CP1
PRELIMINARY
SERVICE
CHECKS
(Continued)
SERVICE
CHECKS
SEE INTERCONNECTING
DIAGRAM, PLACEMENT
CHART, AND PHOTOS TO
MATCH
THE NUMBER IN
THE CIRCLES WITH THOSE IN THE
FOLLOWING DATA FOR SERVICE
CHECKS TO BE PERFORMED
©
©
©
©
PRINTER DEAD
(a) Check Fuse F1.
If bad,
disconnect
the
Power
Transformer
(T1)
connectors
CN2 and CN7.
Check
for shorted windings or shorts from the windings
to
the chassis.
Replace Transformer T1 if bad.
(b)
If Transformer T1 is good, disconnect connector
CN6
(On Control
Board) and check the Regulator
Transistor
(Q6)
with
a
transistor tester. If Tran-
sistor
Q6
is
good, replace or troubleshoot the Con-
trol Board and the Driver Board.
(c)
If
Fuse F1
is
good, apply AC power and check
for
120VAC at pins 1 and
2
of connector CN7. If
120VAC is missing, check the
AC Power
Cord
(P1)
and Master Power Switch (SW10).
(d)
If 120VAC is present, disconnect connector CN2
and check the
following AC voltages on the secon-
dary windings of Transformer T1
at
connector
CN2. 9.83V
AC at
pins
1 to
2,
25.8VAC at
pins
3 to
4,
10.33VAC at pins 5 to 6 and 16.63V
AC
at pins 7 to 8.
If any voltages are missing, replace Transformer
T1.
If the
voltages are good, replace or
troubleshoot the Control Board and the Driver
Board.
WILL NOT RECEIVE
DATA
FROM
COMPUTER
(a)
Check Microcomputer
IC (1C)
and
Interface IC (8B)
by
substitution.
PRINT HEAD WILL NOT PRINT
(a)
Remove power. Check resistance
of the
print head
solenoids from pin
7 of connector CN10 to pins 1
thru
5 and
9
thru
12
of connector
CN10
(23
ohms
each). If
bad,
replace the
Print Head (H1). If good,
check the connections and wiring from connector
CN10 to connector CN6 (On Driver Board).
(b) If
the
connections are good, check the Interface IC
©
(8B) by substitution.
@
PRINT HEAD HAS MISSING DOTS
(a)
Check the print head solenoid resistance
(23
ohms) of the solenoid
producing the missing dot
(See
Wiring
Diagram). If the solenoids check
good,
remove the Print
Head
and check
the
print
head
wires for
possible
damage.
(b)
If the print head
is good, check the Microcomputer
IC (1C) and Interface
IC (8B) by
substitution.
PAPER FEED AND TIMING
BELT MOTORS DO NOT
FUNCTION
(a)
Check for 26.3V
at pin 10
of connector CN6 (On
Driver Board). If 26.3V is
missing, remove power
and check the
Regulator Transistor
(Q6)
with a
transistor tester. If
Transistor
Q6
is good, replace
the Control Board or
troubleshoot the power sup-
ply section on
the Control Board.
(b) If 26.3V
is present, check
the Microcomputer IC
(1C)
and Slave Microcomputer IC
(9B)
by
substitu-
tion.
(c) If IC's 1C
and
9B
are good,
remove power and
check the resistance of
the motor windings
(48
ohms each
winding). Check the
Timing Belt Motor
Assembly C (M1) from
pin
13
of connector CN6
(On
Driver Board) to
pins
21
thru 24 of
connector CN6.
Check the Paper Feed
Motor Assembly A (M2) from
pin
14
of connector CN6 to pins 25
thru
28
of con-
nector CN6.
(d)
If the motors check good,
check the Home Posi-
tion
Sensor
(PT1) by
monitoring pin 20
of connec-
tor CN6 (On Driver
Board) with
a
logic probe while
sliding a
piece of paper in and out of
the
slot in
the
Home Position Sensor. The probe
should read low
with the paper out
of the slot and high with paper
in. If the readings are not
correct, check for 2.37V
at
pin 12 of connector CN6.
If
2.37V
is present,
replace the Home
Position Sensor (PT1). If 2.37V
is
missing, replace or troubleshoot
the Driver Board
and the Control Board.
(e)
If the Home Position Sensor
is
good,
check the
PTS
(Position Timing Sensor) (PT2) by checking
for
pulses at pin 19 of
connector CN6 while manually
moving the Print Head. If no
pulses appear,
replace the PTS Sensor (PT2).
If pulses appear,
replace or
troubleshoot the Control
Board.
FUNCTION
BOARD BUTTONS HAVE NO
EFFECT
(a)
Check connector CN1A
for good connection.
(b) Remove power and check
contacts of Switches
SW1A, SW2A
and
SW3
(On Function
Board) with
an ohmmeter.
(c)
If the
IC's are good, replace or troubleshoot the
Control Board and the Driver
Board.
PRELIMINARY
SERVICE
CHECKS (Continued)
PRELIMINARY
SERVICE CHECKS
(Continued)
HOME POSITION
SENSOR-
PTS-
CPOSTION
TIMING
SENSOR)
(ie
GR
oundDRIVER
board
CN6
.14
.13
,12
.11
.10
,9
,8
,7
,6
,5
,4
,3
,2
.1
48
—
'
—
48-
2.37V
26.3V
~"\
9.83VAC
T1
7.2<
25.8VAC
3
~\
i
10.33VAC
.2*
A
;
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2 3 4 5 6 7
8
T^2B
16.63VAC-
\ 3
11.4
CN2
CN6
1»-
2«-
3*
CONTROL
BOARD
©
CN10
23
PRINTER
MECHANISM
12
11
10
9
8
7
6
5
4
3
2
1
PRINT HEAD
WIRES
©
9
4
8
6
2
6
6 « * * * *
98765432
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1
2
»
©
CN7
^
120VAC(lc
FUSE
F1
2A
AC SWITCH
BOARD
MASTER
POUER
SW10
T
l
PI
120VAC
FUNCTION
BOARD
CN1A
©
©
SW3
SW2A
SW1A
POWER
ON
LF FF
INTERCONNECTING
DIAGRAM
X
INTERCONNECTING
DIAGRAM
COMPUTERFACTS-OF-THE-MONTH SET NO.
CF2
FOLDER
CP1
|||
PRELIMINARY
SERVICE CHECKS
(Continued)
PRELIMINARY
SERVICE
CHECKS (Continued)
PARALLEL
COMPUTER INTERFACE
5c
GROUND
CN6
28
14
is
4a.
5a,
VR1
PULSE
WIDTH
TO
DRIVER
BOARD
PRINTER
MECHANISM
©
,3a,
Tl
POWER
TRANSFORMER
PT1
HOME POSITION
SENSOR
5d
CNIO
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_(£)
pt2\
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PIS
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TIMING
SENSOR}
FUNCTION
BOARD
120V
AC
3
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PLACEMENT
CHART
IV
PLACEMENT CHART
IX
PRELIMINARY
SERVICE
CHECKS (Continued)
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COMPUTERFACTSOFTHE-MONTH
SET NO.
CF2 FOLDER
CP1
v
PRELIMINARY
SERVICE CHECKS
(Continued)
120VAC
CN7
PIN
1
©
SW10
7
F1
© ©
AC
SWITCH
BOARD
VI
PRELIMINARY
SERVICE
CHECKS
(Continued)
o
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X
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Z
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CN5
PIN
1
DRIVER
BOARD
VII
PRELIMINARY
SERVICE CHECKS (Continued)
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CONTROL
BOARD
VIII
PRELIMINARY
SERVICE CHECKS
(Continued)
PRELIMINARY
SERVICE
CHECKS (Continued)
PARALLEL
COMPUTER INTERFACE
5c
GROUND
CN6
28
14
is
4a.
5a,
VR1
PULSE
WIDTH
TO
DRIVER
BOARD
PRINTER
MECHANISM
©
,3a,
Tl
POWER
TRANSFORMER
PT1
HOME POSITION
SENSOR
5d
CNIO
©
_(£)
pt2\
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PIS
CPOSITION
TIMING
SENSOR}
FUNCTION
BOARD
120V
AC
3
O
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rn
X
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Z
o
PLACEMENT
CHART
IV
PLACEMENT CHART
IX
PRELIMINARY
SERVICE
CHECKS (Continued)
PRELIMINARY
SERVICE CHECKS
(Continued)
HOME POSITION
SENSOR-
PTS-
CPOSTION
TIMING
SENSOR)
(ie
GR
oundDRIVER
board
CN6
.14
.13
,12
.11
.10
,9
,8
,7
,6
,5
,4
,3
,2
.1
48
—
'
—
48-
2.37V
26.3V
~"\
9.83VAC
T1
7.2<
25.8VAC
3
~\
i
10.33VAC
.2*
A
;
•
§
•
•
(»
•
o
2 3 4 5 6 7
8
T^2B
16.63VAC-
\ 3
11.4
CN2
CN6
1»-
2«-
3*
CONTROL
BOARD
©
CN10
23
PRINTER
MECHANISM
12
11
10
9
8
7
6
5
4
3
2
1
PRINT HEAD
WIRES
©
9
4
8
6
2
6
6 « * * * *
98765432
K»
•
1
2
»
©
CN7
^
120VAC(lc
FUSE
F1
2A
AC SWITCH
BOARD
MASTER
POUER
SW10
T
l
PI
120VAC
FUNCTION
BOARD
CN1A
©
©
SW3
SW2A
SW1A
POWER
ON
LF FF
INTERCONNECTING
DIAGRAM
X
INTERCONNECTING
DIAGRAM
COMPUTERFACTS-OF-THE-MONTH SET NO.
CF2
FOLDER
CP1
|||
PRELIMINARY SERVICE CHECKS
(Continued)
DISASSEMBLY INSTRUCTIONS
CABINET
REMOVAL CONTROL
BOARD REMOVAL
Remove the
knob on the right side. Set the
printer
on its left
side and remove four
Phillips screws from the bottom.
Set
the printer back
down, liftupon the left side of the cabinet
and move the cabinet to
the
right to
clear the manual paper
feed shaft. Unplug the
Function board connector and remove
the cabinet.
Remove two Phillips screws from
the
Function
board and
remove the Function board from the cabinet top.
Unplug
the ground connector
(FG), connector CN2
and con-
nector
CN6. Remove one Phillips screw near the center of
the board and two
Phillips
screws from the
transistor heat
sink
on the side of the board. Push the three board retaining
clips back, lift
up
and remove the Control board.
PRINTER
MECHANISM REMOVAL
AC SWITCH
BOARD REMOVAL
Unplug the power
transformer from the board and remove
one
Phillips screw holding the
board and one Phillips screw
holding the ground
lead of the power cord. Remove the
AC
Switch board.
Unplug the
printer
mechanism cable from the
Driver board.
Remove two
Phillips screws going thru
rubber
grommets at
the front of the mechanism and remove one
Phillips screw
from the grounding strap next
to
the power transformer.
Slide the mechanism forward and lift mechanism out
of
the
cabinet bottom.
DRIVER BOARD
REMOVAL
PAPER
END BOARD REMOVAL
Unplug
the
printer mechanism
cable and remove
two Phillips
Unhook
PE Lever Spring
(3-2)
from
Outer
Paper Guide (6-1)
screws holding the
board. Lift
up
and remove the Driver and remove
Paper End Board.
board.
MECHANICAL
REMOVAL,
REPLACEMENT AND
ADJUSTMENTS
RIBBON
CARTRIDGE
REPLACEMENT
TIMING BELT
REPLACEMENT
Sfide
Carriage
Assembly
(5-4)
to center.
Move
Scale
Shaft
(5-11) back
and remove Ribbon
Cartridge.
Turn
knob, on
replacement
Ribbon Cartridge,
counterclockwise
to tighten
ribbon.
Install the Ribbon
Cartridge
with the
four
tabs (two
on
each end)
in the slots of Frame
Assembly LB
and RB (1-1
and 1-2).
Press down
on Ribbon
Cartridge to
secure in
place.
Slip the ribbon
between Print
Head
(H1) and
Ribbon
Mask
(5-16). Turn knob
to retighten
ribbon.
PRINT HEAD REPLACEMENT
Slide Carriage
Assembly
(5-4) to
the
right. The Print
Head
cable has
a pull
tab. Use
this
tab to disconnect
Print Head
cable from connector
on Terminal
Board
(8-1).
Turn
Head
Lock Level
(5-5)
clockwise. Lift and
remove
the Print Head
(H1). Install replacement
by reversing the
removal
procedure.
TRACTOR
FEED REMOVAL
While pressing forward
on Sprocket
Mounting Levers
L and R
(6-18
and
6-20),
rock the
assembly
back and lift from
the
printer.
PAPER
THICKNESS ADJUSTMENT
Head Adjustment Lever
(5-9)
moves the
Print Head
toward
and away from
Platen Unit
(5-1) to
allow
for
paper thickness.
Maximum
paper thickness is 0.3mm
(0.012 in). The
seven
set-
tings provide
normal adjustment.
If adjustment
of lever
is re-
quired,
because of replacement
of parts, perform
the follow-
ing procedure.
Set the lever
to the center position and
loosen the nut
secur-
ing Carriage
Shaft B
(5-8).
Insert
a screwdriver
into hole in
shaft.
Hold screwdriver
perpendicular
to Base Frame
Assembly B
(1-3)
and retighten
nut. Movement
of
Head Ad-
justment Lever
toward Maximum
-
position should
move
Print Head
toward the Platen Unit.
If Print Head
moves
away,
loosen nut, rotate
Carriage Shaft
B 180 degrees and
repeat
adjustment.
Remove printer
mechanism
from the
cabinet, see
Disassembly
instructions.
Loosen Belt Tension Plate
Assembly
(4-6)
and
remove
tension from Timing
Belt A (4-1).
Remove bottom
left and
top right screws securing Motor
Heat Sink
A
(2-2).
Remove
belt from
Belt Driving Pulley
Assembly
(4-2). The belt is fitted
into the
grooved
plastic
projection
at the
base of Carriage Assembly
(5-4)
and glued
in place.
A cutout is
provided in
Base Frame Assembly B
(1-3)
for
access to separate
the belt from
the Carriage
Assembly. Slide the
Carriage
Assembly
over this cutout,
located
to the right
of the Terminal
Board
(8-1).
The
type of glue
used does not
produce
a
permanent bond.
From the
bottom, the grooved
plastic
projection can be
forced
apart to remove
the
belt or, if preferred,
a
drop of rub-
ber cement
solvent (or
equivalent) can
be
used.
CAUTION:
Too much
solvent can
damage the belt.
Tension on belt
should not
be adjusted until
solvent
has completely dried.
Install
replacement
by reversing
the
removal
procedure.
Before
adjusting tension
apply a drop
of glue and allow to
dry to prevent
belt from
slipping
out of the
Carriage
Assembly.
TIMING BELT
MOTOR
REPLACEMENT
Loosen Belt Tension
Plate Assembly
(4-6)
and remove tension
from Timing
Belt A
(4-1). Remove four mounting
screws from
Timing
Belt Motor Assembly
C (M1). Remove the motor
assembly and
Motor
Heat Sink
A (2-2). Slide the motor
assembly from the
heat sink.
Observe routing
of lead
wires
and verify
the same routing
after performing
replacement.
Unsolder motor
assembly lead
wires from
Terminal
Board
(8-1).
Install
replacement
by reversing the
removal procedure.
PAPER FEEDING
MOTOR
REPLACEMENT
Remove two mounting
screws
from Paper
Feeding Motor
Assembly A (M2).
Observe routing
of lead
wires and
verify the
same routing after
performing
replacement. Unsolder motor
assembly lead
wires from
Terminal
Board (8-1).
Install
replacement
by reversing
the removal
procedure.
2
O
D
X
o
oo
Z
o
XI
PRELIMINARY
SERVICE
CHECKS
(Continued)
TEST
EQUIPMENT
AND TOOLS
TEST
EQUIPMENT
Digital
Volt/Ohm
Meter
Logic
Probe
Transistor
Tester
TOOLS
Phillips Screwdriver
Needlenose
Pliers
Solvent for Belt
9/32"
Socket
Small
Screwdriver
PARTS
LIST
AND
DESCRIPTION
ITEM
N0. PART
NO.
DESCRIPTION
F1
X502060020
Fuse (2A
@
250V)
H1
F401
400000 Print
Head
M1
F303027000
Timing
Belt Motor
Assembly
C
M2
F303031000
Paper
Feed Motor
Assembly
A
Q6
Y422306000
Regulator
Transistor
(2SA1075)
T1
Y422501100
Power
Transformer
1C
Y422800201
Microcomputer
IC
8B
X400081550
Interface
IC
9B
Y422800203
Slave
Microcomputer
IC
Y422204500
AC Switch
Board
(MFIL)
Y422205000
Control
Board
(HMTP)
Y422202000
Driver
Board (MDRI)
Y423590000
Printer
Mechanism
(Model-3310
6a
PIN
1
SW3
CN1A
SW2A
SW1A
ll
',
;-
.
.
.
, .
FUNCTION
BOARD
XII
SAMS
COMPUTERFACTS
EPSON
MODEL
MX-80IIIF/T
o
Z
op
O X
"si
Q
O
5
a.
o
MODEL
MX-80IIIF/T
PRELIMINARY
SERVICE
CHECKS
ENCLOSED
SAFETY
PRECAUTIONS
See
page 23.
Page
Adjustments
10
Block
Diagram
22
Disassembly
Instructions
g
Exploded
View
Printer
Mechanism
8,25
Tractor
Feed
24
General
Operating
Instructions
10
GridTrace
Location
Guide
Control
Board
28
Driver
Board
26
Line
Definitions
23
Logic
Chart
20,21
Mechanical
Parts List
9
Mechanical
Removal,
Replacement
and
Adjustment
11
Parts
List
14 thru
19
Page
Photos
AC
Switch
Board
26
Chassis-Top
View
28
Control
Board
4,5,29
Driver
Board
6,7,27
Function
Board
21
Safety
Precautions
23
Schematics
Control,
Driver
&
AC
Switch
Boards
31,32,33
Function,
Control
& Driver
Boards
2
ICPinouts&
Terminal
Guides
3,30
Notes
3
Troubleshooting
11,12,13
o
o
a
m
m
S
(A
X
O
00
Z
©
SAMS
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.
©
1984
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.
84CF14916
DATE 5-84
COMPUTERFACTSOFTHE-MONTH
SET
NO. CF2 FOLDER
CP1
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