Epson MX-80 IIIF/T Technical Service Data

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.

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

13

of connector CN6

(On

Driver Board) to

pins

21

thru 24 of

connector CN6.

Check the Paper Feed

Motor Assembly A (M2) from

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

;

•

§

•

(»

•

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)

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\

y

PIS

CPOSITION

TIMING

SENSOR}

FUNCTION

BOARD

120V

AC

3

O

o

m

rn

X

o

d>

Z

o

PLACEMENT

CHART

IV

PLACEMENT CHART

IX

PRELIMINARY

SERVICE

CHECKS (Continued)

o

m

Q

"^

UJ >-

U^

11

-

CQ

LA

/QC

PS

«S

«

—

'

uj

pr

lu

evi

CL

n

CO

M

<C ^

CO

<

©*2!!

-—

CO

^

oo

o

55

h-

UJ

—J

CO

UJ

jvrj

CQ

<£

CHASSIS-TOP

VIEW

COMPUTERFACTSOFTHE-MONTH

SET NO.

CF2 FOLDER

CP1

v

PRELIMINARY

SERVICE CHECKS

(Continued)

120VAC

CN7

1

©

SW10

7

F1

© ©

AC

SWITCH

BOARD

VI

PRELIMINARY

SERVICE

CHECKS

(Continued)

o

D

X

o

oo

Z

o

CN5

1

DRIVER

BOARD

VII

PRELIMINARY

SERVICE CHECKS (Continued)

o

<t:

<t

o

>

<

CO

CO >

CO

_

to

CO

o

LO

s

2

t~

T—

C\j

0„

%SWB8*

(

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\

y

PIS

CPOSITION

TIMING

SENSOR}

FUNCTION

BOARD

120V

AC

3

O

o

m

rn

X

o

d>

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

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

a

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

CM

-DT1-

iPART

OFi.5

i

]RM4

i

33001

1!

.PART

OF[

6

]RM4

i

3300

111

iPART

OFl

7

]RM4

i

3300

I

1

!

iPART

OFJ.81

)RM4

i

3300 IP

'PART

OFL

9

1

JRM4

'

3300

1

II

'PART

OFJlOi

|RM4

|

3300

-DT1-

-DT2-

-DT4-

-DT5-

PART

OF

2E

HD74LS00P

10

CN1

PARALLEL

>—STB-

COMPUTER

1

rpjfjTx-o-rtT,

INTERFACE

""'

m

>

2

'

SERIAL

C?3

COMPUTER

'

INTERFACE_»,

cm

PARALLEL

COMPUTER

{i .

,

INTERFACE

'PART

OF[

6

i

]IM3

i

3300

4.88V

X>

R9

4.30V

»>°

PART

OF

2E

H074LS00P

r

4.30V

Cll _

.0047

J_

O

SEE PINOUTS, TERMINAL

GUIDES AND SCHEMATIC

NOTES

PAGES

3,

30

LINEIDENTIFICATIONS ASSIGNED FORREFERENCE

-107M-

PART OF

3C HD74LS04P

H>

87V

4.86V

3.54V

3.55V

355V

3.55V

4.86V

3.55V

4.86V 3 58V

3.62V

4.86V

3.62V

e

D8155C

INTERFACE

.86V

190V

4.85V

3.23V

2.81V

.85V

238V

2

87V

HI1K9I

9

Hill

PART

OF

7C

HD7406P

-0-

CN3

88V

,

SERIAL

"N

COMPUTER

INTERFACErr.

CABLING

HEAVY LI

USE

OF MULTIPLE LINES

HEAVY LINE

REDUCES

Til

PARTOFllO'

!RM3

4.88V

Hill

29

H(l)

30

Hill

31

Hill

32

Hill

33

Hill

34

Hill

35

Hill

38V

1.53V

2.25V

2.83V

.03V

,07V

92V

3

93V

15V

36

Hilt

LI7I

,02V

i—

NC

,05V

-AD2-

-AD3-

-AD6-

-AD7-

P16

P15

_|

I

77V|H

rl s^—

PARTOF

7E

HD74LS04P

PARTOF

7C

HD7406P

—

r

4.5V-

2/4S

m

92V

1.92V

3.25V

2.83V

2.38V

2.87V

1.53V

225V

2.82V

CR2

6MH2

—IUr-p

C14

1

C15

J:

lOpF

CWi

^33

SERIAL

7.,,-

1.2.0.0

COMPUTER

C

\

INTERFACE

a

R34

3300

:

SERIAL

C"

3

COMPUTER

„

INTERFACE

"

>

—

PET/TRS

iPART

OF

,'rm3

k

;

PART

OF

iMOTli

SW21

gm

SWITCH

m,

R35

OFF

_,

ON

iff

1200

H

PART

OF

3E

HD14093BP

PART

OF

3E

HD14093BP

-DISPLAV-

vNC

11|P

3.08V

1.99V

D8041C-591

9B

SLAVE

MICROCOMPUTER

4

86V

04V

PART

OF

5E UPA2003C

WIS)

34

I

4

iPARTOF|4l

]RM5

i

3300

fl'.

^>

L(16) 63V

-vw

—

BS

C3sX

.01T

PARTOF

7E

HD74LS04P

CN1A

—

r—«-

R24

k

9

2200*

,

H

PARTOF

X

1

11.84V

Vd"hD74LS05P

BZ1

—

E|

NC

BUZZER

HID

-[>«!!

15V

-[>oi™

11.86V

1.37V

PART

OF

7D

HD74LS05P

"O

L(l) 23V

PARTOF

7E

HD74LS04P

PART

OF

6D

HD74LS05P

Ull

>

Hill

j^m

PART

OF

6D

HD74LS05P

-0

s

(11

1.38V

PART OF

6E

HD74LS02P

unir

-

S

-ym

R32

15V

10K

08V

vw

PART

OF

5E

UPA2003C

L^J^HOO)

CR

RUSH

HI10I

PARTOF

60

HD74LS05P

PARTOF

5E

UPA2003C

^1(13)

-£>m

14.35V

PART

OF

7D

H074LS05P

_£>•!!!!

1.38V

PART

OF

7D

HD74LS05P

-O*

•111)

4.88V

PART

OF

5E

UPA2003C

-[>HU2>

26.0V

A

PHOTOFACT

STANDARD

NOTATION

SCHEMATIC

with rarrmnywa

©

Howard W.

Sams &

Co.,

Inc.

1984

FUNCTION,

CONTROL

&

DRIVER

BOARDS

SEE

LINE

DEFINITIONS

ON

PAGE 23

FUNCTION,

CONTROL

& DRIVER

BOARDS

-COLUMN

-

132

-COLUMN-

EPSON

MODEL MX-80IIIF/T

IC

PINOUTS,

TERMINAL GUIDES

&

SCHEMATIC

NOTES

TERMINAL

GUIDES

rri

ident

HD74LS175P

KJ

,

— Ql

CLK

Ql

"l

.J

-|

H«3

°3

CLK

>

Qo

—i i—

i— Do

Qo

D2

Q2

CLK

-KP

1A,

2A

QUAD D

TYPE FLIP/FLOP

WITH CLEAR

TOP VIEW

TEST0

vcc 40

XTAL 1

TEST

1

P27

39

XTAL2 IDACK

38

RESET

P26

DRQ

37

SS

P25fiBF

36

cs

P25/OBF

35

LA

P17

34

RD

PI6

33

AO PIS

32

WR

PI4 31

SYNC

P13

30

DO"

P12

29

Dl

Pll

28

L)2

P10 27

D3

VI)1) 26

D4

PROG

25

05 P23 24

D6

m

23

i)/ m 22

VSS P20

21

SLAVE MICROCOMPUTER

TOP VIEW

ADDRESS

INPUT

A7

VCC

24

A6

AS

23

AS A9 22

A4

Ai!

21

A3 OE

20

a.;

A10

19

Al

cl

18

A0 07 17

00

06

16

I'll

05

15

02

04

14

GND 03

13

ADDRESS

INPUT

ADDRESS

INPUT

3A, 4A

THREE STATE HEX DRIVER

TOP

VIEW

IB

ROM

TOP VIEW

TO VCC

40

XTAL 1

Tl

a

XTAL

2

P27

38

RESET

P26

37

SS

P25 36

INT

P24

35

FA

it;

34

1!.":

P16

33

PSEN

P15

32

*R

P14

31

ALE

PI

3

30

DBO

P12

29

lb:

Pll

28

DB2

P10

27

DBS

VDD

26

DB4

PROG 25

DBS

P23 24

186

P22

23

DB7 P21

22

VSS

P20

21

IC

MICROCOMPUTER

TOP VIEW

INTERFACE

TOP VIEW

BCE

Q2

FRONT

VIEW

Q3

THRU

Q5

BOTTOM VIEW

p^

I

1

B E C

Q6

FRONT

VIEW

1 PC3 VCC

40

2 PC4 PC2

39

'

3

TIMER

IN

PCI

38

4

RESET

PC0

37

.

5

PC5

pb;

36

6

TIMER

OUT

PB6

35

7 10/M

PBS

34

8

CE

ORCE

P84

33

9

RD

PB3 32

10

WR

PB7

31

11

ALE

FBI 30

12

AD0 PB0

29

13

AD1

PA7

28

14

AD2

PA6

27

15

AD3 PA5

26

16

AD4 PA4

25

17

AD5

PA3

24

18

A06

PA2

23

19

AD/

PA1

22

20

VSS

PA0

21

E>

L> L>

L>

[>

F> L>

O

cnTa

wiring view

171

n n

n

n n

i

U

n

u

i

3 1

1

Is

4 Lj

CN2

WIRING

VIEW

CN6

WIRING

VIEW

2C, 2E,

3C,

3E,

6D,

6E, 7C,

70, 7E

TOP VIEW

5E,

6B, 7B

TOP VIEW

I I IIIII I I I I

2

3 4

5

6

12 3 4 5 6 7

8

9

10 11

RM1 RM2

RM3. RM4

FRONT

VIEW

FRONT VIEW

DRIVE BOARD

ONLY

IDENT

IA

TOP VIEW

DRIVE BOARD ONLY

Ql THRU

Q20

FRONT

VIEW

DRIVE BOARD ONLY

IDENT

I I III I I

17

3 4 5 6

7

RM5

FRONT

VIEW

DRIVE

BOARD ONLY

IDENT

DRIVE

BOARD

ONLY

14 13 17

11 10

9 8 7 6 5 4 3 2

151617 18 19 20 71 72

3

24

25 26

27 28

CN6

WIRING

VIEW

I IIIII

I I

I

1 I 3

4 5 6 7 8

9 10 11

RM1

FRONT

VIEW

; 17 16 15

14

13

12

11 10

9 7 6 543 2

1

a a

w~w-1

a i b a a a

«

a

—

i

"ii

"

a a

36 35 34 33 32 313029 28

27 26

25 24

23

22

21 20

19

CN1

WIRING VIEW

I I III

I

12 3 4 5

6 7

8 9

RM2

FRONT

VIEW

2 345 6 7 8 9 10 11 12

j

iibii !!ii

j

|l

1 aI a I

b-

|

• o

2

•

.

ft

a

o

8

•

*

10

11

•

12

13

•

14

15 •

«

16

17 •

• u

19 •

• 20

21

• •

22

CN10

SOCKET VIEW

CN4, CN5

VIEW

CN3

SOCKET

VIEW

HI

PRINT

HEAD

FRONT

VIEW

SCHEMATIC NOTES

-a—

Circuitry

not

used in

some versions

—

Circuitry

used

in

some

versions

e

See

parts list

+

Ground

^

Common

tie point

Voltages

measured

with digital

meter.

Waveforms

and

voltages are

taken from

ground,

unless

noted

otherwise.

Voltages,

waveforms

and

logic

readings

taken with

printer

On

Line and

not printing

unless

noted.

Printer

Self-Test

mode

used to

get readings

taken while

printing.

Switches

SW1 and

SW2

set as shown

on

schematic.

Waveforms

taken

with triggered

scope and

Sweep/Time

switch

in Calibrate

position,

scope input

set for

DC

coupl-

ing on

"0"

reference

voltage

waveforms.

Switch

to AC in-

put to view

waveforms

after DC

reference

is

measured

when

necessary.

Each waveform

is

7.5cm width

with

DC

reference

voltage

given

at the

bottom line

of

each wave-

form.

Time in

/is

per

cm, given

with

p-p

reading

at the

end

of each

waveform.

Item

numbers

in

rectangles

appear in the

alignment/adjust-

ment

instructions.

Supply voltage

maintained

as

shown

at input.

Controls

adjusted for

normal

operation.

Terminal

identification

may not

be found

on unit.

Resistors

are V2VJ

or less,

10% unless

noted.

Value in

(

)

used in

some versions.

NOTE:

Logic

probe

readings

taken

with

printer

On Line and

not

printing

unless

otherwise

noted.

Printer

Self-Test

mode

used to

get readings

with

switches

SW1 and

SW2 set

as shown

on

schematic.

Logic

Probe

Display

L

=

Low

H

=

High

P

=

Pulse

* =

Open (No lights

On)

(1)

Probe

indicates

P when

printer

is

printing.

(2)

Probe

indicates

L with no

paper in printer.

(3)

Probe

indicates

H with no

paper in

printer.

(4)

Probe

indicates

L when

print

head is not

at

home posi-

tion.

(5)

Probe

indicates

H when

print

head is not

at home posi-

tion.

(6)

Probe

indicates

H when

print

head moves

from

left

to

right,

and L

when

head

moves from

right

to left.

(7)

Probe

indicates

H when

the printer

is not

on line.

(8)

Probe

indicates

L

when the

printer

is not

on line.

(9)

Probe

indicates P

when

the printer

is not

on line or is

printing.

(10)

Probe

indicates

L when

printer is

printing.

(11)

Probe

indicates

P when

a line

feed

occurs.

(12)

Probe

indicates

L when

a line

feed

occurs.

(13)

Probe

indicates

H when

printing.

(14)

Probe

indicates

H when

a line feed

occurs.

(15)

Probe

indicates

L when

buzzer

sounds.

(16)

Probe

indicates

H

when buzzer

sounds.

(17)

Probe

indicates

H when

printing

in

compressed

mode.

O O

m

r-

3 X

do

o

Tl

m

C/)

O

z

30

COMPUTERFACTS-OF-THE-MONTH

SET NO.

CF2 FOLDER

CP1

CONTROL

BOARD

4

A Howard W. Sams

Pholo

o o

r—

m

23

X

O

oo

Z

o

CONTROL

BOARD

COMPUTERFACTS-OF-THE-MONTH

SET NO. CF2

FOLDER CP1 5

DRIVER

BOARD

6

A Howard W. Sams MhWUHfiWH

PKo»o

1

1A

CN4

O

D

3

O

a

i—

m

2 t/)

X

o

do

Z

o

CN<

PIN 1

,

in

DRIVER

BOARD

COMPUTERFAGTS-QF-THE-MONTH

SET NO.

CF2 FOLDER

CP1

7

o

X

o

do Z

o

PRINTER MECHANISM

8

Courtesy of

Epson America,

Inc.

PRINTER

MECHANISM

25

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, lift

up

on 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

screws holding

the board. Lift

up

and remove the Driver

board.

Unhook

PE Lever

Spring

(3-2) from

Outer Paper Guide

(6-1)

and

remove

PE Board

(3-4).

MECHANICAL PARTS

LIST

o

REF.

PART

NO.

DESCRIPTION

1-1

F304002000

Frame

Assembly

LB

1-2

F304003000

Frame

Assembl

y RB

1-3

F304053000

Base

Frame

Assembly

B

2-1

F303027000

Timing Belt

Motor

Assembly

C

2-2

F303026010 Motor

Heat

S

i n k

A

2-3

F303031000

Paper

Feeding

Motor

Assembl

y

A

3-1

F3

1001 1000

PE Lever

Assembly

A

3-2

F303007020

PE

Lever

Spring

3-3

F3

10090020

PE Lever

Shaft

4-1

F303014010

Timing

Belt

A

4-2

F303017000

Belt

Driving

Pulley

Assembly

4-3

B210151490

Bal

1 Bearing

(3 used)

4-4

F303018010

Belt

Driven

Pul

ly

4-5

F3030

18020 Belt

Driven

Pulley

Flange

4-6

F303019000

Belt

Tension

Plate

Assembly

5-1

F304005000

Platen

Unit

5-2

F304004010

Platen

Gear

5-3

F304004020

Plane

Bearing

(For

Platen)

(2 used)

5-4

F303006000

Carriage

Assembly

5-5

F303005010

Head

Lock

Lever

5-6

F303005020

Head Lock

Lever

Spring

5-7

F303001010 Carriage

Shaft

A

5-8

F303001020

Carriage Shaft

B

5-9

F303001030 Head

Adjustment

Lever

5-10

F304007010 Paper

Holding

Lever

5-11

F304 0080

10

Scale

Shaft

5-12

F304008020

Paper

Holding

Roller

A

(2 used)

5-13

F304008030

Paper

Holding

Spring

(2 used)

5-14

F303001060

Scale

Spring

L

5-15

F303001070

Scale

Spring

R

5-16

F303001092

Ribbon Mask

5-17

F303001100

Head

Sitting

Plate

6-1

F304009011

Outer

Paper

Guide

6-2

F304009020

Inner Paper

Guide A

6-3

F303036010

Sprocket

Frame

L

6-4

F3030

11020 Sprocket

Wheel

(2 used)

6-5

F303036020

Paper Holding

Cover

L

6-6

F303011060

G-pin

(2

used)

REF. PART

I

NO. NO.

DESCRIPTION

i

6-7

F30301

1040 Paper

Holding

Cover

Spring

(2

used)

a

6-8

F30301

1050

Sprocket Lock

Lever

(2 used)

6-9

F304104010

Sprocket

Shaft

6-10

F304

104020

Sprocket

Gear

6-11

F304004020

Plane

Bearing

(For Sprocket)

(2 used)

6-12

F304101020

Sprocket

Guide Shaft

6-13

F303010020

Paper

Guide Rol

ler

6-14

F303001080

Sprocket

Transmission

Gear

6-15

F303021001

Paper

Guide

Plate

A

6-16

F303037010

Sprocket

Frame

R

6-17

F303037020

Paper

Holding

Cover

R

6-18

F304

101030

Sprocket

Mounting

Lever

L

6-19

F304101060

Sprocket

Mounting Lever

Spring

(2

used)

6-20

F304101040

Sprocket

Mounting Lever

R

6-21

F304

102000

Sprocket

Mounting

Plate

Assembly

A

6-22

F304

103000 Sprocket

Mounting

Plate

Assembl

y

B

6-23

F304101010

Sprocket

Reduction

Gear

6-24

F304101050

Paper

Position

Adjusting

Plate

6-25

F304001010

Sprocket

Mounting Shaft

6-26

F304001050

Release

Lever

Shaft

6-27

F304001

030

Release

Lever

L

6-28

F304001040

Release

Lever B

6-29

F304006010

Paper

Feed i ng

Shaft

6-30

F3

10006010

Paper

Feeding

Rol ler

(2

used)

6-31

F304001

020 Paper Feeding

Spring

(2

used)

6-32

F304001060

Platen

Cover

6-33

F304001070

Rol

l-in

Protector

6-34

F3

10006020 0-ring

(4

used)

7-1

F303020000

Planetary

Lever

Assembly

7-2

F303020020

Planetary

Pinion

(3

used)

7-3

F303014020

Ribbon Driving

Gear

8-4

F304057000

3310

Cable

A

8-5

A279950001

Wire

Band

(3 used)

8-6

F303023010

Edging

A

(3

used)

m

-o

w o

z

For

replacement of

parts not listed,

order

from manufacturer, state description

and

location of

part.

COMPUTERFACTS-OF-THE-MONTH

SET NO. CF2 FOLDER

CP1

GENERAL OPERATING

INSTRUCTIONS

PRINT

STATUS

(SW1) AND LINE FEED STATUS

(SW2)

PRINTER SELF-TEST

SW1

On

1

Compressed

2

Not Used

3 Paper Out

Sensor

On

4

Italic

5 Emphasized

6

Buzzer On

7

Slashed Zero

8

Select

Fixed

On

Not Used Not Used

Auto Line Feed with

Carriage Return

One

Inch Skip Over

Pert

Off

Normal

SW2

1

2

3

Paper Out

Sensor Off Normal Normal

Buzzer Off

Regular Zero

Select Not Fixed

Off

Line

Feed

from Host

Normal

(No Skip)

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 but-

ton 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.

ADJUSTMENTS

HEAD DRIVER PULSE WIDTH

ADJUSTMENT

Connect the input of

a scope to Test Point

TO on the Driver

Board and set the horizontal

sweep to .1 ms trigger

to positive

edge. Use

the printer

self-test mode

(Hold LF button down

while turning

On the

printer) to make

the printer print. While

the

printer is

printing,

adjust

the

Pulse Width Control (VR1)

for

a

pulse

width of

.32ms.

See

Figure

1.

Connect Channel

B

input of the scope to pin 28

of IC

1C

and

set the

trigger

to

trigger

on

Channel

B,

negative edge, normal

mode. Check for

a

time d ifference of .8ms

or more from the

trailing edge of the PRAV signal on pin 28 to

the leading

edge

of the first pulse of the TIN signal on pin 39.

If the time

dif-

ference is less than .8ms, readjust the PTS

Sensor Board

slightly for

a

difference of .8ms or more.

See

Figure 3.

Figure

1

TIN

PRAV

"1

Figure

3

PTS

SENSOR BOARD ADJUSTMENT HOME POSITION SENSOR ADJUSTMENT

Connect

Channel A of

a dual trace

scope to pin 39 of

Microcomputer IC

(1C)

and

set the horizontal

sweep to

,5ms,

trigger to

positive

edge.

Use

the

printer self-test mode (Hold

LF

button down while

turning On the printer)

to

make the

printer print. Loosen the

screw holding

the PTS (Position

Timing Signal) Sensor

Board to the right side of the carriage

return

motor.

Use a screwdriver in the slot

provided to adjust

the PTS Sensor Board for

a pulse cycle of 2.08ms while the

printer is printing.

See Figure 2.

Connect Channel

A

input of

a

dual trace scope to

pin 1

1

of

IC

3E and Channel

B

input to pin

39

of IC(1C). Set

the horizontal

sweep to

.5ms and

set

the trigger for

Channel

A, positive

edge,

normal

mode. Use the

printer self-test mode

(Hold

LF

button down while turning On the

printer)

to

make the printer

print.

Loosen the screw holding

the Home Sensor Board and

use a screwdriver in the slot provided to adjust the Home

Sensor Board for a phase relationship

of .9ms

to

1.2ms bet-

ween the reset signal on pin 11 of IC 3E

and

the

TIN signal on

pin 39 of IC 1C. See Figure 4.

U-2.08ms-*|

Figure

2

TIN

RESET

SIGNAL

i r

9ms to

1.2ms

Figure

4

I

10

MECHANICAL

REMOVAL

REPLACEMENT AND ADJUSTMENTS

RIBBON CARTRIDGE REPLACEMENT

TIMING BELT

REPLACEMENT

Slide 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.

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).

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 Car-

riage 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

forc-

ed apart to remove the

belt or, if preferred,

a drop of

rubber

cement solvent

can be used.

CAUTION: Too

much solvent

can damage

the belt. Tension on

belt should not

be

adjusted

until solvent has

completely dried.

TRACTOR FEED REMOVAL

While pressing forward

on

Sprocket

Mounting LeversLand

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.

Apply a drop of

glue

and

allow

to

dry,

after replacement, to

prevent

belt from slipping

out of the

Carriage

Assembly.

Engage belt with

Belt Driving Pulley

Assembly (4-2) and

Belt

Driven Pulley

(4-4). Verify belt enters one

slot and

exits other

^^

slot

in

Frame Assembly RB

(1-2). Move Belt Tension Plate

-m

Assembly

to

left

and tighten. *f

TIMING BELT MOTOR

REPLACEMENT

s

Loosen Belt Tension Plate

Assembly

(4-6) and remove

tension

O

from

Timing Belt

A (4-1). Remove four

mounting screws

from

^

Timing Belt

Motor Assembly

C (M1). Remove the motor

r~

assembly and Motor

Heat Sink

A (2-2). Slide the

motor

2

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.

3!

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.

m

-d

c/)

O

2

TROUBLESHOOTING

PRINTER

WILL NOT RECEIVE

DATA

Printer will not

receive data from

the computer.

Set

the com-

puter

up to send information

to the printer

and check for STB

(Strobe)

signal

pulses at pin

8

of

IC 2E.

If the STB

pulses are missing, check

for pulses

on pin 12 of IC

3C. If the

pulses are present

on pin 12 of

IC 3C, check

Capacitor

C1

1

and check

IC 2E by substitution.

If the pulses

are

missing on pin

12 of IC 3C, check

Capacitor

C9

and

check

IC

3C by substitution.

If the STB

pulses check

good, check for

pulses on

the

BUSY

line

(pin

4

of Plug

CN3) and the

ACK

line

(pin

6

of Plug CN3).

If

either pulses are missing,

check for

pulses

at

pin 2 of IC 6E.

If pulses are missing

at pin

2 of IC 6E, check Interface IC

(8B)

and

IC

1C by substitution. If pulses

are present at pin 2

of

IC

6E, check

IC's 6E and

7C by substitution.

If the STB,

BUSY and ACK signals

check

good,

check

IC's 8B

and

1C by substitution.

COMPUTERFACTS-OF-THE-MONTH SET NO.

CF2 FOLDER

CP1

11

TROUBLESHOOTING (Continued)

POWER SUPPLY

Printer

will not turn

On. Check the

AC Line

Fuse

(F1).

If

Fuse

F1

is bad, check Capacitors

C1A, C2A and

C3A on the AC

Switch

Board for

possible shorts,

check Transformer

T1 for

shorted windings, and

check the

inputs and

outputs of the

Bridge

Rectifier

Diodes

(DB1, DB2 and

DB3)

for possible

shorts

to

ground.

If Fuse

F1 is

good, apply AC

power and check

for

120VAC

from pin

1 to

2

of

Plug CN7.

If 120VAC is

missing, check

the

Master Power

Switch

(SW10). If the

120VAC

is present,

check the

AC

voltages

on the

four secondary

windings of

Transformer T1 at Plug

CN2. If any

of the AC

voltages are

missing, check Transformer

T1

windings.

Check

the DC voltages

at the

outputs of

Diodes

DB1, DB2

and

DB3.

If any

of the

voltages are missing,

check the

associated

Diode.

Check for

26.3V at pin

3

of Plug

CN6. If

26.3V is missing,

check the voltages and

components

associated

with Driver

Transistor

(Q1)

and

Regulator

Transistor

(Q6),

and check

Zener Diode ZD4.

Check for

1 1 .84V at

the

collector

of Regulator

Transistor

(Q4).

If

11.84V is missing,

check the voltages

and

components

associated with Driver Transistor

(Q3)

and

Transistor

Q4,

check Zener Diodes ZD1 and

ZD2, and

Diode

D2.

Check for 4.88V at pin

2 of Regulator

SR1. If

4.88V is

missing,

check Regulator SR1 and

associated

components.

Check for 14.13V at the

emitter of

Regulator Transistor

(Q2).

If 14.13V

is missing,

check Transistor

Q2,

Zener Diode

ZD3

and Capacitor

C21.

MICROCOMPUTER CHIP OPERATION

Check

for 4.88V

on

pin 40 of Microcomputer

IC (1C).

If 4.88V

is

missing,

refer

to the

"Power

Supply"

section of this

Troubleshooting

guide.

Verify that

the clock oscillators are functioning

by

checking

the

waveforms on pin 2 of IC

1C

and Slave Microcomputer IC

(9B)

and check

for

a

frequency

of 6.00MHz on

both

oscillators.

If either oscillator is not functioning, check the

components

connected

to

pins

2

and

3

of the

IC

with the

defective

oscillator

and check the IC by substitution.

If the

clock

oscillators are good, check the waveforms on

pins 9

and 11 of IC 1C and

11 of IC9B.

The

pulses

should

measure 2.5/is

from the leading edge of one pulse to the

leading

edge of

the next

pulse. If

any

of

the waveforms are

missing, check

the IC

by

substitution. If the waveforms

check good,

check the logic probe readings on the remaining

pins

of IC's 1C

and

9B.

If the pulses

at pin

37 of IC

1C are missing, check

IC

1C by

substitution.

If the pulses

are present,

check for pulses

at

3

of Timer

IC

(1A) on the Driver

Board while printing.

If the pulses

at pin

3 of IC 1A are

missing, check the

voltages

and

components

associated

with pins

1 thru 8 of IC

1A and

check the

adjustment

of the

Pulse Width Control

(VR1). If

pulses

are present,

check

for pulses

at Test Point TO

and

check for

a pulse

width of

about .32ms.

If the

pulses

at Test Point

TO are missing,

check Switching

Transistor

(Q5)

and

check pins

1 and 16 of IC

6B. If the pulse

width

is not correct,

check the

adjustment

of the Pulse

Width

Control

(VR1). If the

pulses

at Test Point

TO

are

good, check

for

pulses

at pins

2

and

29 thru

36 of Interface

IC (8B) while

printing.

If the

pulses at pins

2 and

29 thru

36 of IC 8B are missing,

check

IC

8B by

substitution. If the

pulses are present,

check

IC

7B

and

pins

6, 7,

10 and

11 of IC

6B.

If one

pin in the

Print Head is

not functioning,

check for the

waveform

shown

in Figure

1 at the

collector of the

Transistor

driving

the

defective pin

while printing.

If the collector

waveform is

good, check

the pin on

the Print Head

for possi-

ble

damage.

.50V

.1ms

0V

DC

REFERENCE

Figure

1

If the collector waveform

is missing, check for

the waveform

shown in

Figure 2 at the

base

of the Driver Transistor while

printing. If the base waveform is

good,

check

the

Driver Tran-

sistor and check for an open

solenoid coil in

the Print

Head.

If the base waveform

is

missing,

check the buffer driving the

Driver

Transistor and check

IC 8B by

substitution.

1.6V

.1ms

Figure 2

PAPER

FEED

MOTOR

ASSEMBLY

0V

DC

REFERENCE

Printer will not

advance

the

paper. Put the printer in Off

Line

mode

(press the

On Line

button), press the

FF (Form

Feed)

button

and check for

the waveform

shown in Figure

3 at the

collectors

of Line Feed

Driver

(Q14

thru

Q17).

PRINT HEAD

Print Head is

moving back and forth

but

not printing. Check

for 26.3V

on the emitters of Driver Transistors

(Q1

thru

Q9)

on

the

Driver Board.

If

26.3V

is missing, refer

to the "Power Sup-

ply"

section

of this Troubleshooting guide. If 26.3V is good,

check

for

pulses

at

pin 37 of Microcomputer

IC (1C)

while

printing.

Figure

3

52V

5ms

0V

DC

REFERENCE

12

TROUBLESHOOTING

(Continued)

PAPER FEED

MOTOR

ASSEMBLY

(Continued)

If the collector waveform

is missing

at

one

of the Transistors,

check

for the waveform shown

in Figure

4 at the base of the

Transistor. If the

base waveform is present,

check

the Tran-

sistor, and

associated components,

that has the

missing col-

lector waveform.

If the Transistor

and

associated com-

ponents check

good,

check the

Paper

Feed Motor

Assembly

(M2). If the waveform on the

base of the

Transistor is miss-

ing,

check the buffers driving the

Transistor

and check

Slave

Microcomputer

IC (9B)

by

substitution.

2V

5ms

OV

DC

REFERENCE

Figure

4

If the

collector waveform

does not

appear on any

of Tran-

sistors

Q14 thru

Q17,

check the

voltage on the

collector

of

Line

Feed Driver Transistor

(Q20)

after

pressing the

FF

but-

ton. The

voltage should

go up to 25.5V. If

25.5V is missing,

check the emitter

and base voltage of

Transistor

Q20. If the

emitter

voltage is missing,

refer

to

the

"Power

Supply" sec-

tion of this Troubleshooting

guide.

If the

base voltage

does

not

drop to

about 24.8V after pressing the

FF

button, check

Transistor

Q20 and associated

components.

Also, check the

logic

probe readings

on pins6and

1 1 of IC

5E

and

pins 1 and

2ofIC 6D.

If the

probe readings are not

correct, check

IC's

5E, 6D and

9B by substitution. If all readings

are

correct, check

the

Paper Feed

Motor Assembly.

TIMING BELT MOTOR ASSEMBLY

Timing

Belt Motor Assembly (M1) does not move the

Print

Head

back

and forth. Check the operation

of the Home Posi-

tion

Sensor (PT1)

and

the PTS (Position Timing Sensor)

Sen-

sor (PT2).

Check the

Home

Position

Sensor

by

monitoring the logic

probe reading

at

20

of Plug CN6 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 the paper in the slot. If the

Home Position Sensor

checks

good, check

the logic

probe reading

at

11 of IC 3E

while sliding the paper in and

out

of the

Home Position Sen-

sor. The probe should read high with

the paper

out

of the slot

and low with the paper in the slot. If the probe reading

is not

correct, check the components

connected to pins

12

and

13

of IC 3E and check

IC 3E

and Slave

Microcomputer

(9B) by

substitution.

Check the

PTS

Sensor

by

checking

for pulses

with a logic

probe

at

pin 19 of Plug CN6 while manually

moving the Print

Head.

If the PTS Sensor checks good, check for

pulses at pin

10 of IC

3E

while manually moving the

Print Head. If the

pulses are missing, check the components

connected to pins

8

and

9 of IC 3E and check IC's 3E and

9B

and

Interface IC

(8B) by

substitution.

If the sensor

circuits check

good, check for the

waveform

shown in

Figure

5

on the

collectors of

Carriage

Driver Tran-

sistors

(Q10

thru

Q13)

while

the printer is printing.

YYYYS

Figure

5

52V

5ms

0V

DC

REFERENCE

If the collector

waveform

is

missing on

one of the Tran-

sistors,

check for the

waveform

shown

in Figure

6 at

the

base

of the Transistor.

If

the

base waveform is

present, check the

Transistor,

and

associated

components,

that has the missing

collector

waveform.

If the

transistor and

associated com-

ponents

check

good, check

the Timing

Belt Motor

Assembly.

If the

base waveform

is missing,

check

the buffers driving the

Transistor

and

check IC

9B by substitution.

s

/

< *

y

o

Figure

6

1.4V

|

5ms

0V

DC

REFERENCE

If the collector waveform

does not

appear at any of

the Tran-

sistors

Q10

thru

Q13,

check for

25.4V on the collector of

80

Column Driver Transistor

(Q18)

and

14.00V on the

collector of

132 Column Driver Transistor

(Q19)

while printing. If the

voltages check

good, check the Carriage

Return Motor.

If 25.4V is missing

from the collector

of Transistor

Q18,

check

for 26.3V on the emitter.

If 26.3V is missing, refer

to

the

"Power Supply"

section

of

this

Troubleshooting guide.

NOTE: If the printer

is printing in the

compressed mode,

the

voltage

on the collector

of Transistor Q18 will

stay at 0V.

If

the emitter

voltage of Transistor

Q18 checks

good,

check the

logic

probe

readings on

pins

8,

9

and

10 of IC 6E

and

pins 5

and

12

of

IC 5E while printing.

If the probe

readings

are good,

check Transistor

Q18

and

associated

components.

If the pro-

be

readings

are not correct,

check IC's

5E, 6E

and

9B

by

substitution.

If 14.00V is missing

from the collector

of Transistor

Q19,

check for 14.13V on the

emitter of Transistor

Q19. If 14.13V

is

missing,

refer

to

the

"Power Supply" section of this

Troubleshooting

guide. If 14.13V

is present, check the logic

probe readings

on pins

3

and

4 of IC 6D and pins

7

and

10

of

IC 5E while printing. If the

probe readings

are good, check

Transistor

Q19 and check

the components

associated

with

Transistor

Q19. If the probe readings

are not correct, check

IC's 5E,

6D

and

9B by substitution.

CO

o

COMPUTERFACTS-OF-THE-MONTH

SET

NO.

CF2 FOLDER

CP1

13

</)

(0

C

u

V

D

E

a>

c

u

03

(0

z

o

-O

a)

M

E

i_

1-

=3

Q.

Z

U

DC re

C)

0-

0)

(0

aj

</)

UJ

Q

o

5

co

a

re o

z

t/>

1-

<

!Tt

o

1- CO

a

(0

1-

CO

c

o

z

o o

cc

c

s

<

Q)

J=

UJ

a.

5 CO

m

CM

zi

^—

o

m

m >* *

m in

in

o

i

i *

o o =t

*

rr

r^

i~»

o r~

r-~ cni

o o

OOO

Os

I

|

5

a;

m

a\ co

oo

r~

Oj

o\

m

*T

N

Os

Os Os Nl

tsl

N

Nl

* *

-I?

KN.

O

1

CM

I I I

CM CN

CM

i i

CM

1

1 1

CM

i i

LU

UJ

<N

**"

""

CM

X

\o

*

<

< <

z O

vO cm

cm

m

o

<

o

1

—

*—

in

cm

Os

2

z

in

\

«—

»—

r—

<M

CM

n,

in

m

^~

ss

s. \

\

=£

i—

in

vo

in

m in

in in

vo

QL

CH.

cm

o o

O

*

•*

m

_

^_

O <

0\ i-

»-i-«—

,_

r~

i~-

r~

CTi Ov

5°-

0-

0-0-0. 0.

a.

0.

0-

0. 0-

Q-

LUUJUJ

LU

JSiSi

in

UJ

LU

3 2 3e

LU

S

3:

CM

^

^f

d

o,

_

o o

—

m

in

m

so

VO

—

00

0\ Os

CM

m

I

s

-

r~

O

r-»

r^

vo

in

<

z

in in

in

V

<N

CM

v.

w

<

Os

OsOsOs CM

(M

•—

r- i~-

o

t— Oinmioio in

o

•*

CM

CM hs

CO

CC

Of O 00 CO

o o

1—

*

t CM

m m

*

VO V0

ON

_l

<

—

OS Os

—

•—

O **

— r-

•—

I"

M"^"in

a.

m

in tn

m

in

^

*4

*£ i<i

^

</> co co

a) co

Os

mm

m

C^ONOs

in

m

<

1

CO

CO CO

CO

CO CO CO

CO CO

co co

< o

d

LU

2

z

in

r-

z

LU LU

o

<

CM

^t

^-

01--00

—

m

so SO

CM

in in m

<

o

o\

os

m

r»

r- O

r~

i^ vo

CO

_i

<

a.

in in

in

LU LU

LU LU UJ

UJ

LU UJ

UJ

CM

CM Os

LU

OsOsOs

LU

UJ

LU

UJ UJ

1— (—

(—

1—

•

K-

Z

z fe

z!5

fe

t- |-

r-

z z

z zzz

"El?

a. LU

CC

rOROLA

RTNo.

in-^oo

m O

O (M CM

*t

4c

<

oo

m

o o

L05CP

05CT

z

in

r-

t--

CO

—I

_i

°2

ON00CO

Os

•*

<

<<<

in

CM

•*

5 <

0-0-

CO

00 oo

oo

i—

i—i

2

siigi

z

hh

fe

z z

CM

222

z

CO

<^

d

ty

o

i-

z

rr!

os

"*

O

•-

in

SO SO

<

< CM

VO

\0 — CM?N

O

CM

OOO

1

t

Uj"j<

CD

Lu

a.

in

*—

SO so

CM

oo oo

or

a: oc

I

I I

LU

hi

UJ

CD

1

1 1

1

UJ UJ UJ CD

CD CD

l I

UJ

CD

>

>• >

LU

O

CD CD

in

d

r- i~

CD

z

CM CM

>*

•*

< <

CO

O

I—

UJ

on

a.

01"-"OO

—

•

mmm

m

VO vo

CM

in

in in

o o

o^

os

m

l-»

l~

O

r~

vo

-J

_i

"•if

Tf

in

in in

O

CDCDCD CD

OOO

OO

s

o

•—

«—

CO

CDCD

CD

OO

O

CM

OS

CD

O

OOO

Os

Os Os

CD

O

CD

OOO

r-

I

s

-

O

CD

o

UJ

UJ UJ UJ

UJ

UJ UJ LU

LU

LUUJLU

UJ UJ

.

d

Qi Z

O

Q

r-

vo in

O

o

•3-0

o

.

o

—

o

o o

m

o

O

~

O o o

in

o

m

OOO

o

•—

m

r^

in

OOO

S S

—

o

cm

o

in

mom

o

CM

•-

CM

O

P^

OOO

o

O

-Ol-

oo

\o

*t

-o- m

o o OOO

«—

Sfc

0£

•—

o **r

O

m

in

ooinos

o o

vo

o

OOO

O

2

<

a.

O ^f

o

o o

o

-<t

O

o m

o

o o

m m

cm

—

m

O CM

o

o o o

ooo m

OOO

o

CM

^f

*J-

*

o o

o o o

O CM

-a-

mm

m

m m cm

m m

m

XXX x!2

m

u.

m mm

X XX

85

t

mm

X

XX

mmm

^~

XXX

X

Q.

O

S£

j

>-

>- in in in

in

o

m

0.

in

^

Z

in

^~

oc*oin

•—

_

i^

m

in

i

m

— •—

co

r~

<c

—

^

«—

3C*

co 0000\0

VO

"»

OOO in

-t o o

i I I

I

_l

in

O

•

CO•CO

CD

»—

o

oo co oo in os

O

«—

00

CM CO

in n

O

*<}

n

CM

m

f CM

^*

">*•

<

Q Q Q Q

O < < <

m

o

p-*~p~

«—

cm in

I

s

- »—

CO

CD CQ

CD 00

CO

—

CM

CO CO CO

CO CO

CO

t 0-

< Nl

Nl NlNlNl

Q

CO

XXX X _l

r-IOKl

»~i-

«—

CQ CD CM

CM

CM CM

—

:o zd

x

i

2

^

UJ

O

D1,2

DB1

DB2

m

—

CD

1-

O D_

0-

sr

cm m

OOO

in

^-

vo

O c>

—

—CM

o: o

o

CO

N Nl

m

•*

in

OQO

<

Nl

N

—

14

CO

s

H-

o

DC

c

<

5

C

o

(A

0)

T3

c

k_

o

3 C

Q.

C

4-*

O

<I>

C

o

0}

n

E

o

•a

ID

o

ra

re

z

^_*

o

-D

o

1-

k_

z

o

cc

CO

a>

o

CL

V

CO

m

CO

LU

a

o

2

CO

cc

Q

00

O o

a z

o o

HI

CO

cm cm

incop- p~

m

coco

r-

p~

ooov

co

in

p~

cm in

in

ininin

in

—

p-

Ov—in

p~

p^ cop~oo

co

p~

p~ p»

co

co co p~

VO

CO

P-

llll

1 I

in

m

in

m

m m

in

^ A n

i*"i

I

i

m

in

I I i

in in

in

•******

•**•*

Tt

* •**

*

•*

**

LU

"^

»

Tj-

>!f

*3"

^P

Tj"

•*i-

*>**

•*

<i-^-

"d-

*

"*

Q.

LU

LU LU

LU

Ul

XX

XXIX

LULULU

LU LU

X

XX

X

i

LU LU

XX

1 1

1

LU LU LU

XXX

z

<

o

2

Z

:*:

i-

cc

en.

O

<

£°-

d

in

m

r^

r*

p~ 1*.

<

z

p^ p^ CM

O

VO vO

*

\o \0

in

cm

in *a-

— —

in

o

m

co

tocoto

co co

O

CD

CD m

m

O

o o

°

fc

CO K> K\

CO

VO

CO

a:

—

I —

i —

I

JOOlJ

J _i

_j

O _l

_l

<

•*

t

*•*)•*

•<* •*

o

•*

-3-

•*

*«**

a.

r- r-p-r—

p»

r—

*: *: m ^

^

*:

r-

•*

t

p~

CO

CO CO

P» P~ r-

p-

r~

id *£

^4

CO CO

CO

<

1—

<

CO CO

CO

co co

Zz

o

in in

r- r-» r»

p~

d

p~

p~ cm

o

vo

•*f

\D VO in

cm

in

^~

r—

...

z

-^KIOI^^

O CO

CD m KS

o

o O

o

z

LU

CO

COCOCO

CO CO CO

K\

m

CO

CO CO

CO

VO

CO

*=

fc

I1I

1 I I _l

Q<

0\ _l

-1

*

O

•*

*

_!_!

O

_l

LU

Z OS

<

•*

**

t

•*

*

"* *

rr

•*

t

2

LU

o

<

p~

r»p~r-p-r- P-^^-p-p- p~

p-

P» P~ P»

Q_

LU LU LU LU LU LU LU

LULULU LU

LULU

LU LU LU

2z

Z Z

Z

1—

t—

t-

(—

1—

z

H-l-

zz

i—

1

—

fc—

<

_J a.

<

zz

?

Z

CL

0-

< <

Z

O

P~ P-

LU

^

°

in

z

r-

p»

z

t^

O

z

P-P-NOlOlO

"*

CO CO VO

\o

in cm

in

*

Q£

CO CO

CO

CO CO CO

OKMOK1K1

O

O o o

-1

1-

co

<j\

cy>

co

-J

OO _1 -J

CO CO

—I

—1

—1_1—J

_l

_l_J

_i _j

*•<»

•* ^-

•"»

•*»•

t

*•*•«» -*

*•*

»

•*

p~ p~ p~r-p~

r-

p~ ^

t-

r~-

p~

p-

r~-

zzz zzz z

oo

z

z z z

z

co co co cococo

CO

s

S

CO

CO CO CO

CO CO

ENERAL

LECTRIC

ART

No.

VO

o

p*

CD

uu

Q-

a

m

r-

p-

r~ r»

d

CD

2

O

l—

uj

o;

p^

p--

cm

o

vo vo ^

\o

vO

in

cm

in

•*

--I^OKIIO

O

no CD m in

O

o

CO

CO CO

CO

CO co

m

incoco CO CO

VO

CO

_l_l _l _l JJ -i

0>

o\ _l

-J

_J _i

O _l

_l

*

I"

•*

Tp ** *

O

*

-<t

*<*•*

p»

r»

1—

p~

p~ p~

p» * •* p~ p~

CDCDCD

CD

p~ p~

p^. p^.

p^

cdcdcd cdcdcd

CDO

CD

CD CD

Q-

oo

o

o o o

LU LU

LU

LU LU

o OO o

o

LU

LU LU

LU

O O

LU

OOO

LU

o

CM

O O O O

O O

O

o ooo O

O

o

a:

z

O O

in

cm

o

r-~ "f

o

r»

m

f in

cm •sf

vo

in t

CM

r~

f^

o

vo

O

K>

VO

O

o\

in

o ooo

ooo

o

CD

j_

O o

«-

O

IO

o

moo in o

o o

2

<

a.

O

o o o o

o

Q

O O

in

^-

m

•*

too

*

o o o

oo co

roK»IO

K\

o o

in

m

o

—

m

CM

o

o o

o

P.

°

°.

o ooo

o o

o

CM CM CMCNCM CM

CM

VO CM

"3-

•<t

CM

<*

CMCMCM

t

;T

* «*

a-

Tt

t t

*

•*

•>!••«*

"*^-^-

>- >-

XXX

X

XXX

X XXX

X

X X X

CM

o

0.

0. < 3:

1 VO

Ov

irv

0. 0. r~

O.D.

r--

CL

0. 0. 0-

LU

_

e:

*-*

_

*

o

P~

CM

O VO

^

CO CL

VO

O

0.

in cm

0. in

"*

Q-

O

CO 5:

p-p~

CD

O

r- —

f>QIO

o

m CD

K>

m

"*

*

o o ^<HOO

£

Z

OINIO

O

00

r> CO

COCOCO co

ov in

co

o

O

CO CO

O

VO

CO

«-

l "v

I

—

\ 1

-J

in _J _i _l

p~

_l

O

CTi —

1

P»

o

m in

—

i

_)

in in

o —X

-J

O

VOCMCM

O

CTv

qv Ov

a\

m

in

*3-

^ P^

* *

•t \0

rf

^O ^T

VO

CM

CM CM

•*

T)-

CM

t

^ -<t

CM

— in

m

I

s

- »-

p^

r-

p-

Kn

p-

>-

*

p»

m

o

oo O

CO

<

vO

VO P-P~VO

VOP~P~

P~

o ooo

o

K) P* m

P"S

£ CM

CM CM

>*

ooo

O CO

CO 00

a

CO

Q O

Q

CO

iP

ooo

X_l

XXX _l

X

II-IJ

1-

X

X f=1-X

X X

w

O

t

z

CD

o

< O LU < O LU <

LU

CO O

LU CD

O O LU

CM

CMCMIO ki

in -*

in

vo VO

VO

p~ p~

p~ r»-

o

D

m

co

O

00

O

COMPUTERFACTS-OF-THE-MONTH SET NO.

CF2 FOLDER

CP1

15

c

o

3

(0 a>

v.

•—

(0 a>

X3

o

a>

c

o

3

C

Q.

c

**

O

a>

c

o

n

E

o

"o

c

a>

u

ra

(Q

O

CD

n

Q.

mmm

h

i_

\-

3

0_

Z

o

cc

CO

a>

o

CO

a.

a>

UJ

o

5

"S

cc

a

O

z

CO

I-

<

CO

o

cij

a.

3

a

-i

en

c

cd

o

z

o

cr

c

s

<

ID

x: UJ

a.

£

0)

-»-

O

CM

-i

r~-

,_

CO

ON

z

Is

oo

K1

*

CN

^—

CN ISI M

A

^

1 1

o

O

o

CM CM

""

CM

r-

s: s:

Ki

in in

z

NO

ON

in

—

in

<

o

co co

in on

on

2

Z

^

i-

in

—

—\

w

\ \

"S.V.

—

ON 01

(N in IA

1^1

hO

cc

a. r- CM

CO

00

\0

*— «—

O <

*

On

CO

OO

—

CM CM

5°-

0. 0-

0. 0.

Ol 0.

0-

UJ

LU

UJ UJ

fe^

3 3

X 33

<

ss

(N

oi **

r= in

in

d in

•—

r~

r~ ki

in

<

z

O

t-

in in

<^m

—

ON

01

o

£

OONNS

ql

ce

o

o r» r~ *

* x

NO NO

<

o

*

1^1

>^

o

Q

•*

ON

CT\

OA t5>

CM

in in

o_

on

KN.

1*1

K1

*:

14

CO CO CO

CO

•*

*

<

t—

to CO

CO

< Q

6

1—

>ii

z

<

z

UJ

LU

<N

en

I--

in

m

K>

in in

Z Q£

m

oo

co

—

in

2

<

tn in — —

in

ON ON

UJ

a.

UJ LU

UJ UJ

LU

LU LU

H-

h-

1- 1-

l-

1-

h-

o

z Z

z

z Z

Z

<

_J

Q.

< .

UJ

^

°

Q£

g

z

CO

El

51

I0T0

3

ART

in

*

•*

01 in

in

K1

o\

On in

in in

01

—

i*i

•*

*

in

s

z

5P

"~

CM

—

NERAL

iCTRIC

RTNo.

CM

ON

NO

<*

I

CM CM

»— »—

co

oo

o

1

CD

LU

Q-

in

I

3

tn

1

GE-5 GE-5

GE5Z

OO

LU

UJ

CD

6

CD

Z

<

zs

O

l—

UJ

Q£

<

CM

ON

m

m po

in in

in

»—

00

oo

—

in

CD

in

CD

— —

in

CD

CD ss

Q-

q

O o o

o

o o

LlI

UJ

LU

UJ

LU

o

o n O

oo

o

—

o

O

oi

z

m

O

* r- co

O

in

cm

i-- in

in

cm CM

o o

VO

CM

O o in

O

|_

z;

° O o

o oo

r-

O o in

LL-

S

00

O

r—

Oi r-

cm

O ON

2

<

a.

o co

o o

o O O

O O O

O

<N

o

*">

—

o o

O

CM

o

Ofl

Kl

*

«3-

*

X

>-

X XX

KN.

1^1

to

X

XX

X

on

UJ

in

—

a.

o

i

on

*.

ii

&&*

>-

Z

O O

in

a

CO

in

—

& \0 CM

K1

CM

—

CL

1—

in

—

i

1^

r»

o

co

r-

* i

I

in

mint-

—

r~

o

\o

CM 3

oi

on

r~ r-

—

O

in

-mo**

<

CM

a a

co co

o in

in

oo-cooo

in

CO < CO CO CO

CO

Z2

CM

LU

in

a co q

oo oo

o

co

—

a

CM CM CM CM

<

x

z

in

CO cc

3

L.

3

=>

L, L.

gj

O

t

z

LU

L. x:

L.

x: jz

>

cc

X:

1-

t- CM

in

vo

p"\

—

x: 1-

H

t-

CO O

— NO

r-

CO CO — —

CMS —

<-

—

CM

O O

a^

00 01

a

O O

Q

O

QO,

OOOOI^i M

T)

•

L.

m

Ti

tn i

U

<)

(D

CO

H-

Q

<)

m

•

cl)

CJ

c

•

c

cj

n

o

O

n

in <D

XI

in

w

T3

c

3

ca

<)

L.

O)

—

C O

o

•—

+-

n

c

•—

M

u

^

>-

ID

*

—

a

>»J3

tu

—

b O

jp

CD

>

£

tn

»

m

V)

<

a>

>

<

—

X!

(0

ID

L

c o

E

O

o;

in

•—

in

C CO

CD

*

o

CO O) 3

+-

C

c

o

L.

3

E

c

-(-

1-

in c

>^

O

—

o

n

—

XJ

o

h-

H

1 "in

CD

m

•o

o

C)

tn

0)

XCL<

^

^>

.—»

*

—

CM K1

16

PARTS LIST

AND DESCRIPTION (Continued)

When

ordering parts, state

Model, Part Number, and Description

ELECTROLYTIC

CAPACITORS

ITEM

RATING

MFGR.

No.

PART

No.

CI

6800

50V

X202546820

C2

6800

16V

X202246820

C3

2200

25V

20?

X200302220

C4

10 16V 20?

X200201000

C5

10

35V

20?

X2004

01000

C6

3.3

50V

20?

X200500330

C7

3.3

50V

20?

X200

500330

ITEM

No.

C17

C22

CI

C2

RATING

10

35V

20?

10

35V

20?

DRIVER

BOARD

10 16V

MFGR.

PART

No.

X200401000

X200201000 X200201000

CAPACITORS

ITEM

RATING

MFGR.

No.

PART No.

CIA

.1 250V

C1B

.01

50V

X220201031

C2A

.0047

125VAC

C3A

.0047

125VAC

C8

.001 50V 10?

X220201020

C9

.0015 50V

10?

X220201520

C10

.0015

50V

10?

X220201520

C11

.0047

50V 10?

X220204720

C12 10

50V 10?

X22 120 1006

C13

10 50V

10?

X22 1201 006

C14

10 50V 10?

X22

1201006

C15

10

50V

10?

X221201006

C16

.1

50V

C18

.01

50V

X220201031

C19

.01

50V

X220201031

C20

.01

50V

X220201031

C21

.01

50V

X220201031

C23

.01

50V

X220201031

C24

.01 50V

X220201031

C25

.01 50V

X220201031

C26

.01

50V

X220201031

ITEM

No.

C27

C28

C29

C30

C31

C32 C33 C34

C35

C3

C4 C5

C6 C7

C8

C9

C10

RATING

.01 50V

.01

50V

.01 50V

.01

50V

.01 50V

.01

50V

.01 50V

DRIVER BOARD

.1 50V

10?

.001

50V

10?

.01 50V

.01

50V

.01

50V

.01

50V

.01

50V

.01

50V

MFGR.

PART

No.

X220201031 X220201031

X220201031

X220201031 X220201031

X230011042

X2300

11022

X220201031

X220201031 X220201031

X220201031

X2202

01031

O

o

m

-o

xo

6o

Z

o

17

PARTS LIST AND

DESCRIPTION

(Continued)

When ordering parts,

state Model,

Part

Number, and

Description

CONTROLS (All

wattages

%

watt,

or less,

unless

listed)

ITEM

MO.

FUNCTION

RESISTANCE

MFGR.

PART NO.

NOTES

DRIVER

BOARD

VR1

Pulse

Width

20K

X

180040040

RESISTORS

(Power

and

Special)

ITEM

No.

RATING

REPLACEMENT

DATA

MFGR.

PART No.

WORKMAN

PART

No.

REMARKS

RM1

RM2

RM3

RM4

RM5

RM6

DRIVER

BO

R12

R13

RM1

RM2

Resistor

Network

Resistor

Network

Resistor

Network

Resistor

Network

Resistor

Network

Resistor

Network

ARD

120

5$

5W

WW

120

5$

5W

WW

Res i stor

Network

Resistor

Network

XI

10851030(3)

XI

10851030(3)

XI

10803320(1)

XI

10803320(1)

X1

10863320(4)

X1

10881030(5)

X160321210

X

160321210

XI

10803320(1)

X1

10881220(2)

(1)

Contains

ten,

3300

10$ 1/8W,

resistors.

(2)

Contains

eight,

1200

10$ 1/8W, resistors.

(3)

Contains

five,

10K

10$

1/8W, resistors.

(4)

Contains

six,

3300

10$ 1/8W,

resistors.

(5) Contains

eight,

10K

10$ 1/8W,

resistors.

TRANSFORMER

(Power)

ITEM

No.

RATING

REPLACEMENT

DATA

MFGR.

PART

No.

THORDARSON

PART

No.

NOTES

PRI.

SEC. 1

SEC. 2

T1

120VAC

%

410mAAC

16.

63V

AC

@

180mA

DC

9. 83

VAC

Y422501100

MP-80U-a(

1

SEC.

3

SEC.

4

SEC.

5

10.33VAC

e

560mA

DC

25.8VAC

i

650mADC

(1

)

Number

on

unit.

18

PARTS

LIST

AND

DESCRIPTION

(Continued)

When

ordering

parts,

state

Model,

Part

Number,

and

Description

FUSE DEVICES

ITEM

No.

DESCRIPTION

REPLACEMENT DATA

MFGR.

PART No.

BUSS

PART No.

NOTES

DEVICE

HOLDER

DEVICE HOLDER

F1 2A

S

250V

Fast-Acting

X502060020

, -,— — —

MISCELLANEOUS

ITEM

No.

PART NAME

MFGR.

PART No.

NOTES

BZ1

Buzzer

X503000020

CR1 Crystal

X504000200

6MHz

CR2 Crystal X504000200

6MHz

HI Print Head F40

1400000

LED1

LED X350200010 Power, Grn

(2.00V

8

12mA)

LED2

LED X350200010

Ready, Grn (2.00V

g 11mA)

LED3

LED No Paper,

Red

(1.67V

g

12mA)

LED4 LED X3

50200010 On Line, Grn

(2.00V

g

11mA)

Ml Motor

F303027000

Timing Belt Motor

Assembly

C

M2 Motor

F303031000

Paper Feed Motor Assembly

A

PI Power

Cord

Y422301001

AC, Polarized

SW1 Switch X62

04008

10

Print Status

SW1A Switch

X620

100060 Power On

SW2 Switch

X62 04004

10 Line Feed Status

SW2A

Switch

X620

100060

Form Feed

SW3 Switch X6201

00060

Line

Feed

SW10

Switch

Master Power

SW101

Switch

A 170202502

Paper End

Mechanism

Y423

590000 Printer (Model

-33

10)

P.C. Board

Y422204500

AC Switch (MFIL)

P.C. Board Y422205000

Control (HMTP)

P.C.

Board

Y422202000 Driver

(MDRI)

P.C. Board

Y422203000

Function (MPEL)

P.C.

Board

F303009010

Paper End

P.C. Board

F303009000

Paper End Assembly

(Includes

SW101)

P.C. Board F304056000

Terminal

s

o

m

-o

(fl

x

o

00

Z

o

T1

H

CABINETS &

CABINET

PARTS

(When ordering

specify

model, chassis

&

color)

ITEM

PART No.

Cabinet

Bottom

Y4

22000000

Fuse

Cover

Y428028101

Control

Panel

Overlay

Y42204

3301

Printer

Cover

F

Y423006001

Separator E

Y423024001

ITEM

PART

No.

Separator Rol ler Y422025001 Key

Top

(Power On/Form Y422019001

Feed/Li ne Feed)

Knob-Paper

Feed Y422015001

Knob

Spring-Paper

Feed X510360010

WIRING DATA

or

8421 (Single-Conductor)

(Two-Conductor)

(Solid) Available

in 13 Colors

(Stranded)

Available in

13 Colors

General-use

Unshielded

Hook-up

Wire

...

8208

8522

19

LOGIC

IC IC PIN

IC PIN

IC

IC IC

IC

IC IC

NO. 1A

IB NO.

IC NO.

2A

2C

2E

3A

3C 3E

4A

5E

1 H

P

1 H

21 P

1

H

*

H H

H

P

L(3)

2

P P

2 P

22

P

2

P

*

H

L

H

L

*<8)

3

P

L

3

P

23 P

3

P

H

L

P

L L P

H(8)

4

P P

4 H

24 H(9)

4 P

P

H

H H

L H(2)

H(15)

5

P

5 H

25 H

5

P

L P

H H P

L

6 P P

6 H

26 H

6 H H

H

L H H

L(14)

7 P P

7

L

27 H(8)

7

L

L L

P

L L

P

L(13)

8

L

P

8

P

28 H(10)

8

L

P

H

L H H(1)

L L

9 P P

9 P

29 H

9 P P

H

P

L H(1)

P

H

10 P P

10 H(1)

30 H(10)

10 P

P

L H P

L(1)

H H(10)

11 P P

11

P

31

L(6)

11 P

H

H P

P

L(5)

P H(12)

12

P

L 12

P

32

H

12 P

*

L H L H(4) H H(10)

13

P

13 P

33 L(7)

13 P

*

L

P H H(4) P

L(16)

14

P P

14 P

34

H

14 P

H H

L H H L L(7)

15 P

P

15

P

35 H

15 P

H

L(7)

16

17

H P

P

16

17

P

36

37

LCD

H(1)

16 H

H H H(2)

18

L

18

P

38

H(8)

19

20

P

19

20

P

L

39

40

L(1)

H

LOGIC

(DRIVER

BOARD)

PIN IC

IC PIN IC

PIN IC

21 H

NO. 1A NO.

1A NO.

1A

NO. 1A

22

P

23

P

1

L

3 L

5

H 7 L

24

H

2

H(1)

4 H 6 L

8

H

NOTE: Logic probe readings

taken

with printer On Line

and

not printing

unless

otherwise noted.

Printer Self-Test

mode

used to get readings

with switches

SW1 and

SW2 set as shown on

schematic.

Logic Probe Display

L

=

Low

H

=

High

P

=

Pulse

*

=

Open

(No

lights

On)

(1)

Probe indicates

P when

printer is printing.

(2)

Probe indicates

L with no

paper in printer.

(3)

Probe indicates

H with no paper in

printer.

(4)

Probe indicates

L when print

head is not

at home posi-

tion.

(5)

(6)

(7)

(8)

(9)

(10) (12) (13)

(14) (15) (16)

Probe

indicates

H

tion.

Probe indicates

H

right,

and L

when

Probe indicates

H

Probe

indicates

L

Probe

indicates

P

printing.

Probe

indicates

L

Probe

indicates

L

Probe

indicates

H

Probe

indicates

H

Probe

indicates

L

Probe

indicates

H

when print head

is not

at

home

posi-

when print head

moves from left

to

head

moves from right

to left,

when the

printer is not on line,

when

the printer

is not on line,

when

the printer is not

on line or is

when printer is

printing,

when

a

line

feed

occurs,

when

printing,

when

a line feed

occurs,

when

buzzer sounds,

when

buzzer

sounds.

20

LOGIC

(Continued)

IC IC

IC

IC IC IC IC

IC PIN

IC

NO. 63 6D 6E

7B 7C 7D

7E NO.

88

NO. 8B

NO. 9B

NO.

9B

1 L(1) H(12)

H(8) H(1)

L

L(11) H(1)

1

L(7) 21 H 1

L(1) 21 H(10)

2

L L(14) L

H(1)

H *(11)

L(1) 2

H(1)

22 H 2 P

22 H(10)

3

L

H(10)

L(7)" H(1) L H(11)

H(11)

3 L(1)

23 H

3

P

23 L(6)

4

L L(13)

H(8) H(1) H

L(11)

4

L

24 H

4

H

24

H

5 L H(2) L(7)

H(1)

L(7)

L(1)

5 L

25 H

5

H

25 H

6 H(1)

L(3) L<7) H(1) H(8) *(1)

H(1)

6 H

26

H

6

P

26

H

7

H(1) L L H(1) L

L

7

L(1)

27 H

7 L

27 H(1)

8

L L(1) H(10)

L L(3)

L(1)

L(11)

8 H(9)

28 H

8 P

28

L(1)

9

*

H(1) L

*

H(2)

H(1)

H(11)

9 P

29

H(1)

9

L(1)

29

H(10)

10

LCD

*(1)

L(13) L(1)

L(7)

L(11)

L(7)

10 H(1)

30

H(1)

10 H(1)

30

L(17)

1!

L(1) L(1)

H

L(1)

H(8)

H(11)

H(8)

11 P

31

H(1)

11 P

31 HOI)

12

*

L L L(1)

H *(11)

L(7)

12

P

32 H(1)

12 P

32 H(11)

13

* #

L L(1)

L

L H(8)

13 P

33 H(1)

13

P

33

H(12)

14

*

H

L(1) H

H

14 P

34 H(1)

14

P

34

H(15)

15

*

L(1)

15 P

35 H(1)

15

P

35

H

16 H(1)

L(1)

16 P

36 H(1)

16 P

36

H

17

P

37

L 17

P

37

H

18

18 P

38

L

18 P

38

H

19

19 P

39 H

19

P

39

L(5)

20

L

40 H

20

L

40

H

NOTE: Logic probe readings

taken with printer On Line and

not

printing unless

otherwise noted. Printer Self-Test

mode used to get readings

with switches

SW1

and

SW2 set as

shown on schematic.

Logic

Probe Display

L

=

Low

H

=

High

P

=

Pulse

* =

Open

(No

lights On)

(1)

Probe

indicates

P when printer is printing.

(2)

Probe indicates L

with no paper in printer.

(3)

Probe indicates H

with no

paper

in printer.

(5)

Probe indicates H when

print head is not

at

home posi-

tion.

(6)

(7)

(8)

0)

(10) (11) (12) (13) (14)

(15) (17)

Probe ind

right, and

Probe ind Probe ind Probe ind

printing

Probe ind Probe ind Probe ind Probe ind Probe ind Probe ind Probe ind

mode

icates

H when

print

head

moves from left to

L when head moves from right

to

left,

icates

H when the printer is not

on line,

cates

L when the printer is not on line,

icates P when the printer is not on

line or is

icates L when printer is printing.

cates

P when

a

line feed

occurs.

icates L when

a

line feed occurs.

cates H when printing.

icates H when a line feed occurs.

cates L when buzzer sounds.

icates H when printing in

compressed

o o m

r-

><

o

H§lpEI

...:

rl

El

Hi"

A

Howard W. Sams

EEBSE2H1

fh*°

FUNCTION

BOARD

21

BLOCK

DIAGRAM

22

SAFETY

PRECAUTIONS

1. Use

an

isolation transformer

for servicing.

2. Maintain AC line voltage

at rated input.

3. Remove

AC power from-the printer

before servicing

or installing

electrostatically

sensitive

devices.

Examples of

typical

ES

devices

are integrated

circuits and

semiconductor

"chip" components.

4.

Use extreme caution when

handling the

printed circuit

boards. Some

semiconductor

devices

can be damaged easily

by

static

electricity.

Drain off any

electrostatic

charge on your

body by touching

a known earth

ground.

Wear

a

commercially available

discharging wrist

strap device.

This should

be removed prior

to applying

power

to

the

unit under

test.

5.

Use a

grounded-tip,

low voltage

soldering

iron.

6. Use an isolation (times

10)

probe on

scope.

7. Do not remove or install

boards,

mechanical

or electrical parts,

or other

peripherals

with printer

AC power On.

8.

Do

not

use freon-propelled

sprays.

These can generate

electrical

charges sufficient

to damage semiconductor devices.

9. This printer

is equipped with

a grounded

three-pronged

AC plug. This plug

must fit into

a grounded

AC power outlet. Do not

defeat the

AC

plug

safety feature.

10. Periodically

examine the

AC power cord for

damaged or

cracked insulation.

11. The printer

cabinet is equipped

with vents

to prevent heat

build-up.

Never block,

cover, or

obstruct these vents.

12. Instructions

should

be given,

especially to children,

that

objects should not

be dropped or

pushed into the vents of the

cabinet. This

could cause shock

or equipment

damage.

13. Never

expose the printer

to water. If exposed

to water

turn the unit Off.

Do not place

the printer

near possible water sources.

3

14.

Never leave the printer

unattended or

plugged into

the AC outlet

for long

periods of time.

Remove

AC plug

from

AC

outlet

m

during lightning

storms.

r~

^

3c

15. Do not allow anything

to rest on

AC power cord. ^

^

oo

;

o

16. Unplug

AC power cord from

outlet before

cleaning printer.

=

17. Never

use

liquids

or aerosols

directly on the

printer. Spray on

cloth

and then

apply to the printer

cabinet. Make sure the

-1

printer is disconnected

from the

AC

power line.

LINE DEFINITIONS

ACK

Acknowledge P20 Port

ADO THRU AD7 Address

Data P21 Port

ALE

Address Latch Enable PB0THRUPB7

Drive

Signal

AUTO FEED

Auto Feed PC4 Drive Signal

BUSY

Busy

PE

Paper

End

CE Control Enable PET/TRS

Line

Feed

From

Host

CR RUSH Carriage Return Rush

PRAV

Printer

Availabiltiy

CS

Control Select

PSEN

Program Store

Enable

CTRL HEAD

Control Head

PTS

Position Timing

Signal

DIR

Direction R Reset

DISPLAY

Display RD

Read

DT1 THRU DT8

Data

RS

Home Position

Signal

ERR

Error

SLCTIN

Select

Input

G2

Input SLCTOUT

Select Output

HEAD TRIGGER

Head Trigger STB Strobe

INT

Interrupt STEP1

Step

One

INIT

Initial TIN

Timing

Input

LF RUSH

Line

Feed

Rush WR

Write

P/S

Parallel/Serial 10/M

10 Times

Magnification

P15 Port

80

COLUMN

80

Column

P16

Port 132 COLUMN

132

Column

Any

Bar above any

alphabetical

or

numerical

combination indicates

line active in

a

low

(0)

state.

23

TRACTOR

FEED

24

Courtesy

of Epson

America,

Inc.

o

X

o

do Z

o

PRINTER MECHANISM

8

Courtesy of

Epson America,

Inc.

PRINTER

MECHANISM

25

DRIVER

BOARD

GridTrace

LOCATION

GUIDE

ci

C2

C3

C4

C5 C6 C7 C8

C9

CIO

CN4 CN5

CN6

D1

02

03

D4

M-9

D5

D-11

D6

A-6

D7

E-10

D8

D-10

D9

C-5

D10

B-5

011

C-6

D12

M-9

D13

A

-9

014

G-10

OH

K-IO

D16

H-1

D17

M-6

018

L-6

019

L-6

020

K-6

021

K-6

D22

J

-6

D23

1-6

01

1-6

92

H-6

03

E-6

Q4

B-4

05

B-3

06

D-6

07

E-6

Q8

C-10

09

E-4 010

E-4

Oil

D-4 012

E-4

013

G-5

014

F-4

015

G-5

016

G-6

017

M-7

018

L-7

019

L-7

020

K-7

R1

K-7

R2

J -7 R3

1-7

R4

1-7

R5

H-7

R6

F-7

R7

F-6

R8

F-7 R9

F-6

RIO

G-7

R11

G-7 R12

G-6

R13

H-6

RM1

B-5

RM2

A-5

TO

C-6

VR1

D-10

ZD1

A-6

ZD2

L-9

ZD3

L-3

ZD4

8-6

ZD5

B-4

ZD6

B-6

ZD7

C-8

1A

D-8

E-8

D-8

G-3

G-4

G-9

K-9

F-9

A-8

L-4 K-4

J -4

J

-4

C-4

C-10 A-10

AC

SWITCH

BOARD

26

A

Howard

W. Sams

8«^«lH||fliimd

Photo

o

x

o

oo

Z

o

A

Howard W. Sams

^HEHSSSB

photc

DRIVER BOARD

27

CONTROL

BOARD GridTrace LOCATION

GUIDE

ci

C2

C3

C4

C5

C6

C7 C8 C9

C10

C11

C12 C13 C14 C15

C17

C18 C19

C20

C21

C22

C23

C24

C25

C26

C27 C28

C-14 C29

E-13

C30

E-15

C31

G-13

C32

G-13

C33

H-7

C34

G-9

C35

D-12

CN1

F-8

CN2

I -7

CN3

H-9

CN4

H-12

CN5

H-12

CN6

F-1

CR1

F-1

CR2

D-13

D1

H-14

D2

F-13

DB1

F-13

DB2

G-13

DB3

E-12

,11

B-12

Q1

C-12

Q2

G-12

93

A-7

94

D-7

95

F-7

R1

E-5

R2

D-2

R3

B-1 R4

1-3

R5

H-8

R6

1-7

R7

H-14

R8

A -4

R9

A-13

RIO

E-7

R11

D-6

R12

F-6

R13

C-13 R14

H-12

R15

F-2

R16

G-5

R17

H-14

R18

B-13

R19

A-14

R20

B-15

R21

F-12

R22

E-12

R23

G-14

R24

1-15

R25

H-14

R26

F-5

R27

C-12

R28

C-12

H-13

H-14

F-12

B-13

F-8

1-9

F-8

G-7

1-8

H-12 H-12

B-2

H-13 H-13 H-13

I

-9

E-4

H-14

H-13

H-5

G-6

R29

R30

R31

R32

R33

R34

R35

R36 R37

R38

R39

R40

R41

R42

R43

R44

RM1

RM2

RM3

RM4

RM5

RM6

SRI SW1

SW2

Z01

ZD2

G-6 ZD3

D-5

ZD4

B-12

ZD5

H-5

1A

E-6

IB

F-6

1C

B-2

2A

B-2

2C

B-2

2E

H-13

3A

1-7

3C

1-8

3E

1-8

4A

H-14

5E

I

-7

6B

E-14

6D

B-9

6E

B-7

7B

A -4

7C

B-2

7D

H-5

7E

C-2

8B

F-14

9B

A-10

B-7

C-12

H-14

G-13 0-12

1-8

A-11

C-11 G-11

A-10

F-10

H-10

A-9

F-9

H-8

A-8

H-6

D-5

G-5

H-4

D-4

E-4

G-4

H-3

0-3

D-2

CHASSIS-TOP VIEW

28

to

:;>;:>

C3

Q LU U- CD

ft* H

Jl

«.

1

S

:./"?

o

§ en X

o

oo Z

o

A Howard W.

Sams IWaiHlftMailB Phc

CONTROL BOARD

29

IC

PINOUTS,

TERMINAL GUIDES

&

SCHEMATIC

NOTES

TERMINAL

GUIDES

rri

ident

HD74LS175P

KJ

,

— Ql

CLK

Ql

"l

.J

-|

H«3

°3

CLK

>

Qo

—i i—

i— Do

Qo

D2

Q2

CLK

-KP

1A,

2A

QUAD D

TYPE FLIP/FLOP

WITH CLEAR

TOP VIEW

TEST0

vcc 40

XTAL 1

TEST

1

P27

39

XTAL2 IDACK

38

RESET

P26

DRQ

37

SS

P25fiBF

36

cs

P25/OBF

35

LA

P17

34

RD

PI6

33

AO PIS

32

WR

PI4 31

SYNC

P13

30

DO"

P12

29

Dl

Pll

28

L)2

P10 27

D3

VI)1) 26

D4

PROG

25

05 P23 24

D6

m

23

i)/ m 22

VSS P20

21

SLAVE MICROCOMPUTER

TOP VIEW

ADDRESS

INPUT

A7

VCC

24

A6

AS

23

AS A9 22

A4

Ai!

21

A3 OE

20

a.;

A10

19

Al

cl

18

A0 07 17

00

06

16

I'll

05

15

02

04

14

GND 03

13

ADDRESS

INPUT

ADDRESS

INPUT

3A, 4A

THREE STATE HEX DRIVER

TOP

VIEW

IB

ROM

TOP VIEW

TO VCC

40

XTAL 1

Tl

a

XTAL

2

P27

38

RESET

P26

37

SS

P25 36

INT

P24

35

FA

it;

34

1!.":

P16

33

PSEN

P15

32

*R

P14

31

ALE

PI

3

30

DBO

P12

29

lb:

Pll

28

DB2

P10

27

DBS

VDD

26

DB4

PROG 25

DBS

P23 24

186

P22

23

DB7 P21

22

VSS

P20

21

IC

MICROCOMPUTER

TOP VIEW

INTERFACE

TOP VIEW

BCE

Q2

FRONT

VIEW

Q3

THRU

Q5

BOTTOM VIEW

p^

I

1

B E C

Q6

FRONT

VIEW

1 PC3 VCC

40

2 PC4 PC2

39

'

3

TIMER

IN

PCI

38

4

RESET

PC0

37

.

5

PC5

pb;

36

6

TIMER

OUT

PB6

35

7 10/M

PBS

34

8

CE

ORCE

P84

33

9

RD

PB3 32

10

WR

PB7

31

11

ALE

FBI 30

12

AD0 PB0

29

13

AD1

PA7

28

14

AD2

PA6

27

15

AD3 PA5

26

16

AD4 PA4

25

17

AD5

PA3

24

18

A06

PA2

23

19

AD/

PA1

22

20

VSS

PA0

21

E>

L> L>

L>

[>

F> L>

O

cnTa

wiring view

171

n n

n

n n

i

U

n

u

i

3 1

1

Is

4 Lj

CN2

WIRING

VIEW

CN6

WIRING

VIEW

2C, 2E,

3C,

3E,

6D,

6E, 7C,

70, 7E

TOP VIEW

5E,

6B, 7B

TOP VIEW

I I IIIII I I I I

2

3 4

5

6

12 3 4 5 6 7

8

9

10 11

RM1 RM2

RM3. RM4

FRONT

VIEW

FRONT VIEW

DRIVE BOARD

ONLY

IDENT

IA

TOP VIEW

DRIVE BOARD ONLY

Ql THRU

Q20

FRONT

VIEW

DRIVE BOARD ONLY

IDENT

I I III I I

17

3 4 5 6

7

RM5

FRONT

VIEW

DRIVE

BOARD ONLY

IDENT

DRIVE

BOARD

ONLY

14 13 17

11 10

9 8 7 6 5 4 3 2

151617 18 19 20 71 72

3

24

25 26

27 28

CN6

WIRING

VIEW

I IIIII

I I

I

1 I 3

4 5 6 7 8

9 10 11

RM1

FRONT

VIEW

; 17 16 15

14

13

12

11 10

9 7 6 543 2

1

a a

w~w-1

a i b a a a

«

a

—

i

"ii

"

a a

36 35 34 33 32 313029 28

27 26

25 24

23

22

21 20

19

CN1

WIRING VIEW

I I III

I

12 3 4 5

6 7

8 9

RM2

FRONT

VIEW

2 345 6 7 8 9 10 11 12

j

iibii !!ii

j

|l

1 aI a I

b-

|

• o

2

•

.

ft

a

o

8

•

*

10

11

•

12

13

•

14

15 •

«

16

17 •

• u

19 •

• 20

21

• •

22

CN10

SOCKET VIEW

CN4, CN5

VIEW

CN3

SOCKET

VIEW

HI

PRINT

HEAD

FRONT

VIEW

SCHEMATIC NOTES

-a—

Circuitry

not

used in

some versions

—

Circuitry

used

in

some

versions

e

See

parts list

+

Ground

^

Common

tie point

Voltages

measured

with digital

meter.

Waveforms

and

voltages are

taken from

ground,

unless

noted

otherwise.

Voltages,

waveforms

and

logic

readings

taken with

printer

On

Line and

not printing

unless

noted.

Printer

Self-Test

mode

used to

get readings

taken while

printing.

Switches

SW1 and

SW2

set as shown

on

schematic.

Waveforms

taken

with triggered

scope and

Sweep/Time

switch

in Calibrate

position,

scope input

set for

DC

coupl-

ing on

"0"

reference

voltage

waveforms.

Switch

to AC in-

put to view

waveforms

after DC

reference

is

measured

when

necessary.

Each waveform

is

7.5cm width

with

DC

reference

voltage

given

at the

bottom line

of

each wave-

form.

Time in

/is

per

cm, given

with

p-p

reading

at the

end

of each

waveform.

Item

numbers

in

rectangles

appear in the

alignment/adjust-

ment

instructions.

Supply voltage

maintained

as

shown

at input.

Controls

adjusted for

normal

operation.

Terminal

identification

may not

be found

on unit.

Resistors

are V2VJ

or less,

10% unless

noted.

Value in

(

)

used in

some versions.

NOTE:

Logic

probe

readings

taken

with

printer

On Line and

not

printing

unless

otherwise

noted.

Printer

Self-Test

mode

used to

get readings

with

switches

SW1 and

SW2 set

as shown

on

schematic.

Logic

Probe

Display

L

=

Low

H

=

High

P

=

Pulse

* =

Open (No lights

On)

(1)

Probe

indicates

P when

printer

is

printing.

(2)

Probe

indicates

L with no

paper in printer.

(3)

Probe

indicates

H with no

paper in

printer.

(4)

Probe

indicates

L when

print

head is not

at

home posi-

tion.

(5)

Probe

indicates

H when

print

head is not

at home posi-

tion.

(6)

Probe

indicates

H when

print

head moves

from

left

to

right,

and L

when

head

moves from

right

to left.

(7)

Probe

indicates

H when

the printer

is not

on line.

(8)

Probe

indicates

L

when the

printer

is not

on line.

(9)

Probe

indicates P

when

the printer

is not

on line or is

printing.

(10)

Probe

indicates

L when

printer is

printing.

(11)

Probe

indicates

P when

a line

feed

occurs.

(12)

Probe

indicates

L when

a line

feed

occurs.

(13)

Probe

indicates

H when

printing.

(14)

Probe

indicates

H when

a line feed

occurs.

(15)

Probe

indicates

L when

buzzer

sounds.

(16)

Probe

indicates

H

when buzzer

sounds.

(17)

Probe

indicates

H when

printing

in

compressed

mode.

O O

m

r-

3 X

do

o

Tl

m

C/)

O

z

30

COMPUTERFACTS-OF-THE-MONTH

SET NO.

CF2 FOLDER

CP1

PART OF

SWIO

MASTER

POWER

Fl

120VAC

-T>

190mA

AC

^U^

PRINTINGl

CN3

SERIAL

>

COMPUTER 24

TO GROUND

PLATE

CABLING:

HEAVY LINE

REDUCES

USE

OF MULTIPLE LINES

SEE PINOUTS, TERMINAL

GUIDES AND SCHEMATIC

NOTES PAGES

3,

30

LINE

IDENTIFICATIONS ASSIGNEDFOR REFERENCE

31

A PHOTOFACT STANDARD NOTATION

SCHEMATIC

with

Hnsmna

©

Howard W.

Sams & Co., Inc.

1984

CONTROL,

DRIVERS

AC SWITCH

BOARDS

SEE LINE

DEFINITIONS

ON

PAGE 23

EPSON

CONTROL

,

DRIVER

& AC

SWITCH BOARDS

MODEL

MX-80IIIF/T

32

33

o

CO

I

X

o

GO

Q_

u

a.

t/>

<D

• —

</>

11

uj

.

E

o3

_2

1

5

°

*z

E

2

S

*

.-

©

c

>

0)

X

c

o

si

o

>

*

TJ

>. c

</)

•

—

O

CO

0)

_c

,

^

3

C

Q.

O

M

as

O

ui

•*:

I-

.E

i°

O

fc

U

«

u

O

CD

<

0)

JlwJ

a.!

3

*

F

o

U

o

a»

>

u

a

a.

c

a>

o

o_

E

o

u

tj

c o

>

r-

°

o

w

, r

»

3

E

u

•1

_q

a

cO

J?

i—

o

U

>

<

11

CD Q_

•58

E

O

CO

D >

o

"9

Ji <d

5

B

0)

o

~

u

a

to U

o

r

to

f-

(D

>s

i)

n

jU

_

Q_

1)

to

t/j

CD

03

L.

1

0)

in

c

a

C

n

Z)

0)

n

o

O

l

to

D

c

cd

>

a

a)

N

a)

CD CD

TJ

Tr

o

TJ

CO

0)

CD

"O

J)

_g

o

CO

c

T3

D

CD

0)

X)

O

CD

O

o o

o

U

o

Cl

E

01

o

>~

o

to

U

"O

<B

a!

°

<1>

u

0)

U

o

c

D

u

c

TJ

>

u

C

i—

a)

CD

to

(/>

3

^

CD

O

F

l_

U

c

n

0)

E

~<d

1—

en

CD

a

X

<

LL.

<L>

CO

o

u

OO

3 J0.I

CO

_l

Q_

X

o o

-10. X

1>

o

o 3

-JO.

x

<J o

5 -i

a.

x

o

-IQ. x

o o

-IQ. I

o o

3

-III

—

6

a. z -MK,

o

o o

a.

o.

a.

z —

o

0. z

—

(N M

o

o o

3

Clclq.

z

•

—

o

D_ Z -„

<i)

f-

a)

m

i

Li

<n

o

TJ

u.

T

CU

CT

i

(T

CD

( )

o o

u

>»

0)

-^

X!

u

3

()

rr

H-

n

CD

01

to

>•

TJ

n

U

CD

U

Ui

Q.

•

,°5

E

o u

1/1

-*-

—

? E

.

o

ai

3

5

K

o

U

u

i

11

*

c

-

^2

CD

CO OO

CN

<

^r

co

o

3

o

SO

OO

O

aj

NO

c

^r

o

D

CL

JJJ

<JJ

5!

c

0)

i/i

CO

CL

OJ

O

CO

i_

z>

>.

CO

o

,o

11)

c

F

'D

u

«-*—

CD

u

LU

O

t/1

11

o

O

u

U

>.

a.

U

5

CD

r

TJ

t

c

J3

5

o

D

CL

'5

r

U

O

(/)

n

—

0)

D

TJ

c

t/i

3

TJ

o

c

F

i

)

o

>-

I-

a

fc

CD

0)

CO

(/)

O

LI o

3

-C

cr

u

*_

o

t/>

-)

I

CO

t/1

5

c

O

<

F

CD

LL

U)

(/)

c

o

CD

C

-L1

a

to

c

)

(/)

a

r

u_

c

o

U

CD

E

c

<B

_L.

5

O

D

>-

_Q

LL

E

o

5

o

co 'r;

CD ~

>

«

L

1

V)

D)

Q

H

TJ

c

O

a

c

Jc§

o

r

o

08

"5

CD

M

i-

Eco OX!

«/»

c

§-°

,"E

*

!

Jo

'

o2

s

i—

o

P-.

00

Jk

U

o

a z

o

<2

E

< <

T

a:

1

a

rsi <

a.

Hi

z

<

o

^

>—

or

ct

O

<

Q_ LLCLQ_

31 * 3! ^

o

<

z

Q-

O O

^

O

UJ

z

z 5

<

Q-

2 Z Z TL

<

I*

z z

zr

Z

^

"j

3

«i

CD ill

Cl.

slss

as

<

a:

z

5|

cr~ ir>

O

Q-

d

>;

Z

K.

Lfc

O

K(

viSztn

5

d

Hill