Atari 1025 Technical Service Data User guide

A A

CP21

08979

TECHNICAL

SERVICE

DATA

FEATURES:

EASY-READ

COMPLETE SCHEMATICS

WAVEFORMS

•

REPLACEMENT PARTS LISTS

•

PRELIMINARY SERVICE CHECKS

•

TROUBLESHOOTING TIPS

SEMICONDUCTOR

CROSS-REFERENCE

5AM

5

COMPUTERFACTS"

PRELIMINARY SERVICE

CHECKS

ATARI

MODEL

1025

cc

CM

O

This

which

malfunctions.

Check all

correct hook-up before making service

Replacement or repair of

necessary

TEST EQUIPMENT

CM

O

^

TEST EQUIPMENT

Digital

provides the

data

is designed for quick isolation and repair of printer

interconnecting cables for

after the malfunction has been isolated.

with

user

a

board or connectors

CPU

time-saving

connection and

good

checks.

service tool

may

AND TOOLS

Volt/Ohm Meter

be

Scope

Logic Probe

TOOLS

Phillips Screwdriver

Small

Screwdriver

Low Voltage Soldering Iron

Desoldering Iron

REPLACEMENT

ITEM

D1 Diode, GP15B

NO.

DESCRIPTION

PARTS

AND

DESCRIPTION

D2 Diode, GP15B D5 Diode, GP15B D6

F1

F2 Fuse, 1.75A @250V Fast Acting

Diode, GP15B

Fuse, 1.75A

@250V Fast Acting

M1 Print Head

M2 Carriage Motor

M3 Line Feed Motor

OSC1

Q1

Crystal,

HA17805P

IC,

7.37MHz

Q8 IC, iP8051

T1 Power Transformer, 4LP-45191-137

SAMS

The listing

constitute

Howard

replacement

from information

manufacturers

in

W.

Sams

of

any available

any

case a

& Co.

part. The

furnished

the

of

Howard

4300 West

replacement part herein

recommendation, warranty or guaranty

as to the quality

numbers of these

to

Howard W. Sams

particular

type

W. Sams

62nd Street, P.O.

suitability

and

parts have been compiled

Co.

&

replacement

of

part

does not

of such

the

. by

listed.

&

by

Co.

Box 7092,

Reproduction

content, in

respect to the

vp)

1986 Howard

West

4300

Printed

Indianapolis, Indiana

or

use, without express

any manner, is prohibited.

the information

use of

W. Sams

62nd Street,

in

U.S. of America

P.O. Box 7092, Indianapolis,

Co.

&

86CP14977

contained herein.

46206

permission, of editorial

No patent liability

U.S.A.

is

Indiana

DATE

or

pictorial

assumed with

46206 U.S.A.

8-86

10.5V

PRELIMINARY

SERVICE CHECKS

(Continued)

@

®@

(2H)@)(4F

AIN

CONTROl

'.'..:

PINS 18, 19

7.37MHz

Q8

MISCELLANEOUS

ADJUSTMENTS

FIRST CHARACTER PRINTING

Loosen screws fastening

Turn

motor assembly a

when the

stops at the home sensor

Figure 1. If changing position of

correct the print position, change the

of the carriage synchro-belt on the

teeth.

power is

turned ON, the print

1mm

I

POSITION

Carriage Motor to

little one way or

position within

motor assembly does

•

0.55-0.75mm

Home

Sensor

#e

CN10>-

a

PLATEN/PAPER

Remove the upper

screws. Adjust the

separator for

paper paper separator

SEPARATOR

screws, see

clearance

1

Figure

ADJUSTMENT

loosen the

cover,

approximately

between

Figure 2.

ADJUSTMENT

bottom cover.

the other so that

returns and

head

tolerance, see

engagement

pulley

DETECTOR

0.5mm.

LEVER

paper

the

one

by

platen

Tighten

not

position

or two

separator

and the

the

PRINTHEAD

Print head adjustment

printer mechanism,

Loosen

mechanism. Move

gap between

0.5mm.

ADJUSTMENT

carriage shaft

platen and print

should be

carriage

screws on

Figure

performed

assembly

forward or

head is

2

after repair of

frame, or print head.

the sides of

between 0.45mm and

the printer

backward until

ATARI

MODEL

1025

PRELIMINARY

SERVICE

CHECKS

(Continued)

©

MATCH

THE

POWER

(A) If

(B) Check

(C) If Diodes

(D) Check

(E) Check

(F)

(G) If

(H)

PRINTER

(A) Turn Printer

(B) If carriage

THE

NUMBERS

SUPPLY

the Printer

Diodes

Transformer

for

If 26V is

substitution.

for

missing

If Fuse

shorts.

(Q1)

Replace

Regulator

right.

should

F1 is

Diodes

for

a short.

CARRIAGE

Turn

move

check

Fuse F1 and

26V at pins

SERVICE

NUMBERS

ON

is dead check Fuse F2.

and

D5

D5 and D6 are good, check

26V at anode of Diodes D26 and D46.

missing check Main Control Board

5V

D1 and D2 good, check

IC

OFF, move

assembly

5 and

substitution.

(T1) by

at pin 2 of

Fuse F1.

open, check Diodes D1 and

(Q1).

ASSEMBLY

Printer

to Home position.

of

6

ON THE

THE

SERVICE CHECKS

for

D6

shorts.

INTERCONNECTING

Power

Regulator IC

(Q1),

if

5V is

D2

Regulator IC

check for 10.5V

pin 1 of

at

DOES NOT MOVE

carriage assembly

ON. Carriage assembly

does not move, check

Connector CN4.

to

for

the

for

by

CHECKS

TO

BE PERFORMED.

PRINT

®

(A) Check

good connection.

(B) Check for

D26.

(C)

Check

(D)

Check CPU

(E) Check

MISSING

©

(A)

Clean

(B) Check

nection.

(C) Check

(D) Disconnect

sistances

(E)

Check

(F)

Check

LINE FEED

©

(A) Check

DIAGRAM AND

HEAD WILL

the print

resistances of

Main Control

DOTS

print head

print

the flat

the print head

Main Control

WILL NOT

Connector

NOT PRINT

head

26V at anode

IC

(Q8)

IN THE PRINT

face.

head Connector

cable for broken

print

of the print

OPERATE

CN5 for

PHOTOS

cable

Connector

and

cathode

print head.

by substitution.

Board

by substitution.

PATTERN

CN3

or pinched

head

cable and

head.

by substitution.

Board

by substitution.

good connection.

WITH

for

good con-

check re-

CN3 for

of

Diode

lead.

(C) If 26V is

(D) If the

18 and

(E) If frequency

by

(F) Check

<M2).

(G) Check

(H) Check

missing, check

26V is present,

19 of the CPU

substitution.

resistances

CPU

the

the power supply.

check for

IC

(Q8).

is not

correct, check

of Carriage

IC

Main Control Board

(Q8)

substitution.

by

7.37MHz at pins

Crystal (OSC1)

Motor winding

by substitution.

(B)

Check

resistances of

(C) If the

(D)

(E) If Line Feed

PRINTER

resistances of

check

for 26V

Check Main

gear assembly

gears.

WILL NOT

COMMAND

(A) Check

(B) Check

(C) Check

Connector

for

good connection.

the

Printer

by

Main

Line Feed

at pins 5 and

Control Board

Motor is erratic

on the left

PRINT BY

CN6 or

cable between

substitution.

Control Board

Line Feed

6 of Connector

by

substitution.

or

stops, check

hand

COMPUTER

CN7 whichever

the

Computer

by substitution.

Motor

(M3).

Motor are

good,

CN5.

is

the

used

side for broken

and the

Ill

PRELIMINARY

SERVICE CHECKS

(Continued)

CN10

111

©

CN10>-

QE

®14

4D

I

CNS

13

i I I

12 11

4A>

©

CARRIA6E

ASSEMBLY

9 8

I 1

(2H)

MAIN

B

10

'

(3Ej (4F) (5D)

CONTROL

BOARD

©

PRINT HEAD

(3A) (4B) (4C)

(BC)

CNS

•iON/i

ON/OFF

SWITCH

1

2SV\CN4

(2B)

C5

i"«»<d

^•2SV

F*....l

2SV„ssv

D26

(3B)

©

F2

1.7SA

PLATEN

(5A)

©

1

©

TRANSFORMER

1.7SA

(1E)

C2

LS4S

10

POWER

T1

CMS

35

DS

©

^

12V W

12V

10.SV

-M-

D4

10.5V

~*

10.5V

D3 -M-

-•§-

4.3V

D2

(TF)

-M-4.3V

D1

©

'

G

2

(is)

3n;

IE)

:ic)

-<CNl-4

;cni-3

'CN1-2

-<CN1-1

CN4-1

CN4-:

CN4-3

CN4-4

PLATEN

RIBBON

PROTECTOR

SNAP LEVER

PLATEN

0.3-0.35MI

PRINT HEAD

PLATEN/PRINT HEAD

ADJUSTMENT

0.45-0.!

PRINT HEAD

TOP

CARRIA6E

SHAFT

>

t-

-*

5

o

N3

r

CNS

0SC1

i.rrmt

SP1

mj

\

X

|

,

i-t

h.

W

CN7

© ©

©

IS

CNS-3

HOME

SENSOR

j

I

r

—

LU

DETECTOR

LEVER

a

INTERCONNECTING DIAGRAM

IV

INTERCONNECTING

DIAGRAM

PRELIMINARY

DISASSEMBLY

SERVICE CHECKS

INSTRUCTIONS

(Continued)

UPPER COVER REMOVAL

Remove platen

Loosen two screws

switch assembly

the front

side

upper cover

PRINT HEAD

Remove

Printer. Carefully

cable connector

beneath the print

and lift head

knob, remove

holding switch assembly and slide

backwards. Remove two screws from in-

of upper cover. Tip

from Printer.

REMOVAL

upper cover, slide carriage

remove print head cable plug from flat

located on the carriage

head. Push down print head lock lever

straight

up

PRINTER MECHANISM

Remove Printer

right. Disconnect

head.

Remove the flat

nector from

that fasten flat

connect all

P.C. board.

remove four

cabinet.

upper cover. Slide

print head cable plug and remove

carriage frame

connectors

Set

cable connector screw and the con-

cable to side of printer mechanism.

Printer

screws holding mechanism

Carefully remove

mechanism upright.

top cover by pulling upwards.

upper cover back and lift

assembly to right end of

assembly frame

from the carriage assembly frame.

REMOVAL

carriage assembly to far

assembly. Cut plastic tie-wraps

attached to

side down on

up

P.C.

board. Remove

soft cloth

a

to the bottom of

bottom case and set printer

print

Dis-

and

MAIN CONTROL

Remove upper

from Main Control Board.

Remove flat cable connector from

the tie-wrap which fastens

Cut

side of printer

Main Control

BOARD REMOVAL

cover assembly.

mechanism. Remove two screws

Board. Lift Main Control

Disconnect

Remove print head assembly.

carriage frame assembly.

the flat cable to the

from Printer.

PLATEN REMOVAL

Remove cabinet top

tion. Remove two screws holding paper

remove paper

right

from

side plate. Turn platen bearing

CARRIAGE

end

MOTOR REMOVAL

Remove the upper

disconnect

Carriage Motor leads.

Carriage Motor

from Carriage

Printer.

Connector CN4. Cut

PAPER FEED

Remove upper case.

two phillips screws

of printer

Printer.

mechanism.

cover. Lift scale bar to highest

separator. Remove C ring and platen

of platen. Pull left bearing side ways

cover. Remove the Main Control

Remove two

the bottom

to

Motor pulley.

MOTOR

REMOVAL

90°

and pull out platen.

the tie wraps securing the

screws

cover. Remove carriage belt

Lift Carriage Motor from

Remove Main Control Board. Remove

fastening Paper Feed Motor to

Remove Paper Feed

connectors

all

right

holding

Motor

posi-

bearing

from

Board,

the

left side

from

separator and

fastening

VI

ENVIRONMENT

.IMINARY

PREVENTATIVE

SERVICE

CHECKS

(Continued)

MAINTENANCE

Computers

dust and smoke as much

around

Monitor, Printer,

perform

particles.

as commercial

the

Computer.

or

ELECTRICAL POWER

Variations in the

an AC

receptacle that

devices.

may

be needed to

line voltage

A

power-surge

cure the

KEYBOARD

Liquids

Computer

disassemble

water

cleaner

DISK

Clean the

Use only

Handle

Drives

an

spilled into

and let

and

DRIVES

carefully

can

old disk

power plug

the Keyboard

it dry.

lint-free

read/write

an

approved

knock the

in slot

to

and close

best in

a clean,

Even

Computers

Do not

other

power

can

is on

a power line

protector,

problem.

the

Keyboard can

from AC

and

Use a cotton

wipers on

heads

of

head

cleaning

preserve

disk

proper

head

door

cool

though

are

block

cabinet

devices.

affect

power-line

Do

ruin

power

outlet.

carefully

swab to

accessible

the

Disk

kit.

disk

out of

alignment.

during

area

home

affected,

vents

the

Computer.

not

used

not

it.

rinse

clean

connectors

Drives

head

transport.

that

is below

Computers

it is

of

any

Try

by appliances

conditioner,

switch

power

Immediately

Then,

if circuitry

the

Keyboard

between the

and

about

once

alignment.

If the

80 degrees

are

not

better

to

of the

Computer

to avoid

or other

or

non-interruptable

On

and Off

after

a spill

or

printed

keys.

contacts.

a month or

A

sudden

disk

drive must

Fahrenheit

affected

maintain

these

heavy

frequently.

occurs,

contacts

circuit

Use a

after

bump or

be transported,

cigarette

by

smoke-free

a

system;

fluctuations

current

power

disconnect the

are

contaminated,

board with

non-abrasive

100

hours

jolt

to the Disk

and free

smoke

area

Computer,

by using

demand

supply

distilled

contact

usage.

place

of

Store

disks in

handling

PRINTERS

Carefully

cleaner.

a blanket.

STATIC

Static

anti-static

vironment.

Do

ELECTRICITY

electricity

MONITOR

Use an

isolation

some

Monitors

the Monitor

when

pattern

preserve

the

their

precautions

vacuum

not

This

oil

can

the

discharge

mats,

sprays,

transformer

use

should never

is

being

glare-reduction

protective

usually

Printer

machine.

cause

tools and

HOT

a

changed

covers

found on

regularly.

The oil

components

can affect

materials,

with any

chassis

be left

(chassis

on for long

periodically.

feature.

and

never

the

back of disk

Wipe

will

collect

to overheat

the

Computer. In

and maintain

Monitor

connected

Use caution

touch

surface areas

abrasive

and

that

does not

periods

to one

of

the disk

protective

clean

grit and

fail.

order to

minimize

good humidity

come

side of

time

high

at

when

cleaning

surface.

covers.

using

dust.

as part of

the AC line).

brightness

anti-glare

Observe

a light

The

the

in

the

possibility,

the disk

all-purpose

dust will

act as

Computer

system since

The

face of

level except

screens, to

use

en-

VII

PRELIMINARY

SERVICE

CHECKS

(Continued)

CHASSIS-TOP

VIII

VIEW

ATARI

MODEL

1025

$fiM

o

_

S

COMPUTERFACTS

ATARI

MODEL

1025

S

CM

PRELIMINARY

CL

O

Block

Disassembly

IC Pinouts

Line

Logic

Miscellaneous

Parts List

Photos

Chassis-Top

Diagram

and

Definitions

Chart

SERVICE

ENCLOSED

Instructions

Terminal

Adjustments

View

Guides

CHECKS

Page

17 14

16 15 13

14

7,8,9

INDEX

4

SAFETY

Photos

(Continued)

Main Board

Safety Precautions

Schematics

Schematic Notes

Test Equipment

Troubleshooting

PRECAUTIONS

See page 29.

Page

5,6,11,12

2,3

o

D

§5

>

i-

->

5

o

to

13

en

13

10 10

SAMS.

The fisting

constitute

Howard W.

replacement

from

manufacturers

of any available

in any

Sams

part.

information

case a recommendation,

& Co. as to the quality and suitability

The numbers of these parts

furnished to Howard

of the

Howard

4300 West 62nd Street,

replacement part herein

particular type of replacement

W. Sams

warranty or guaranty

have been compiled

W. Sams

& Co. by

does

of such

part listed.

& Co.

P.O.

Box 7092, Indianapolis,

not

Reproduction

by

content,

in any

respect to the

1986

£

4300

Printed

Howard

West

62nd Street, P.O.

in

U.S.

the

or

without

use,

manner, is prohibited.

use of the information

W. Sams & Co.

of

America.

express permission,

Box 7092. Indianapolis,

Indiana

No patent liability

contained herein.

14977

86CP

46206 U.S.A.

of editorial

is assumed with

Indiana

46206 U.S.A.

or pictorial

DATE

8-86

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W. Sams

NOTATION

MIUHHUJJU

& Co., Inc.

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1986

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PARTS LIST

When ordering

parts,

AND DESCRIPTION (Continued)

state Model, Part Number,

and Description

ELECTROLYTIC

ITEM

No.

C3,C4

C11,

CI 2

RATING

2.2UF 35V

luF

CAPACITORS

35V

CAPACITORS

ITEM

No.

C22

RESIS1rORS (Power

ITEM

No.

RM1,RM2

RM3 RM4

RM5

RM6

(1)

Contains

(2) Contains (3) Contains eight (4)

Contains six

(5) On unit

FUSE

DEVICES

ITEM

NO.

RATING

250VAC

.1

Resistor

Resistor Network Resistor

Resistor

four

(4 ea.)

eight

(6 ea.) 5100 ohms.

number.

DESCRIPTION

MFGR.

PART No.

MFGR.

PART

Special)

and

RATING

Network

Network (4)

Network (3)

(8 ea.) 1000 ohms, (8 ea.) 5100 ohms,

(3)

1000

(1) (2)

ohms.

No.

5%.

DEVICE

ITEM

No.

CI 3

C15

MFGR.

PART

IHR-4-102 (5)

IHR-8-102JA

IHR-8-512JA

IHR-6-512

IHR-8-512JA

MFGR.

PART NO.

RATING

2.2uF 35V

1 uF 35V

REPLACEMENT DATA

No.

(5) (5)

(5)

PART No.

HOLDER

NTE

MFGR.

PART

No.

WORKMAN

PART No.

NOTES

§5

r-

o

in

>

F1.F2 1.75A @

COILS

ITEM

T1

Fast-

&

TRANSFORMERS

No.

Acting

Power

250V

Transformer

MISCELLANEOUS

ITEM

No.

LI 7

LED

Ml

M2

M3

M4

0SC 1

SK

SW1

SW2 SW3

Ferrlte Bead

LED

1

Print

Carriage

Line Feed Motor

Home Position

Crysta

Network

Switch

PART

Head

NAME

Motor

FUNCTION

Sensor

MFGR.

PART

No.

MFGR.

PART No.

Power,

7.37MHz

Power

Print

Paper End Detector

Red

OTHER

IDENTIFICATION

4LP-45191-137

NOTES

TEST EQUIPMENT

Equipment listed

Test

measurements

and is compatible with most types

TEST EQUIPMENT (COMPUTERFACTS)

Equipment Name

OSCILLOSCOPE 1570A,1590A,1596

PROBE

LOGIC

LOGIC PULSER

DIGITAL VOM 2830 DVM37,DVM56,SC61

ANALOG

VOM 277

Manufacturer

by

illustrates typical or equivalent

B & K Precision

Equipment No.

DP51

DP101

used by

field service

Sencore

Equipment No.

SC61

equipment

technicians.

used by SAMS' Engineers

to

obtain

ISOLATION TRANSFORMER TR1

FREQUENCY COUNTER

10,1604,1653,1655 PR57

1803,1805 FC71.SC61

COLOR BAR GENERATOR 121 1A,1248,1251,

RGB GENERATOR 1260

FUNCTION GENERATOR 3020

HI-VOLTAGE PROBE

HV-44

VOM/DMM

Accessory probes

TEMPERATURE PROBE TP-28

CRT ANALYZER

467,470 CR70

POWER SUPPLY

If Printer is dead, check AC

check Diodes D5

and D6 for shorts. If Fuse

check for 31.5V AC between pins 3 and tween pins 1 and

correct, check Power

2 of Connector CN1.

and AC Line Choke (RC).

Check for 26V at cathode

rect, check SCRs D7

Check for 10.5V at cathode

ing check Fuse

fiers (D1 thru D4), Voltage

F1. If Fuse F1 is open, check

components.

LINE FEED

MALFUNCTION

Turn platen knob by hand, if

check the

platen turns

(M3). Check for about 73

and

gear assembly on the left

smoothly, check resistance

pins 2 and 6

5,

and between pins

CN5. If Printer will not

Fuse (F2). If Fuse F2 is

4 and 9.8V AC be-

If voltages are not

Transformer (T1), Power Switch (SW1)

of Diode D13. If voltage is not

and D10 and associated

of Diode D4. If voltage is

Regulator IC

platen

(Q1)

not turn smoothly,

does

side of the Printer. If

of Line Feed Motor

ohms between pins 1 and

4

print while in self test mode,

and 6

1260 CG25.VA62

HP200

TROUBLESHOOTING

waveforms

If waveforms

(Q5).

by substitution. If waveforms are

(Q8)

Q3 and Q4 and Driver ICs TR1A and TR2A.

CARRIAGE ASSEMBLY DOES NOT MOVE

Check the

60 ohms between pins

and pins6and

correct replace Carriage Motor.

If the carriage assembly moves erratically check

Position

nection. Check Interface IC

Q4.

MISSING DOTS IN PRINT

Actuate self

thru 14 of Connector CN3.

check

resistance

missing at any pin check

signal

is low about 5V P-P check

F2 is good,

components.

Bridge Recti-

associated

and

5,

of Connector

open,

cor-

miss-

pins

check

3

at pins

25 thru

are missing, check

resistance

4 of Connector CN4. If resistances

Sensor (M4). Check

and 33 thru

28,

of the Carriage Motor

and

5

pins

1,

Connector

by substitution.

(Q5)

PATTERN

test mode.

Check for 26V P-P signal

of Print Head (M1). If 26V

If signal is present

CPU IC

(Q8)

Driver

36 of Interface

IC Q5 and

present, check

5 and

3,

CN10 for

(M2),

pins

CPU IC

check for

6 and

are not

good con-

Check

at pins

on all

P-P signal is

by substitution.

ICs (IRA3 and IRA4).

IC

ICs

2,

Home

IC

8

pins,

If

10

C13

012

C2

D51 C3

R3

R6

R7

R8

C17

P

R29

D50

D20

C6

D29

D17

D18

R30 R9

D15

D43

D26 D22

C5

D24 052 D54

D45

D44

R15

031

033 C7 C10

R14 R13

R12

R11

RM3

C8

R10

RM1

R19 R17

RM2

R18

R32

C11

R33

C21

R20

C12

RM5

R21

C13

C15

C14

3*

O

>

r-

o

n

5.0V

D5

D6

ARROWS ON IC'S

NOTE:

W. Som«

Howard

A

12

tflUtt!IMMaJ

BCE

TR12

F1

8

INDICATE PIN

Photo

TR11

C

1

E

UNLESS

D27

26.0V

NOTED

TRA2

030

CN5

B C

TR2

L17

D55

034 CN6

B

C

TR3

B C

TR4

E

lit I

BCE

TR5

CN7

ill

E

TR6

E

C B

B

C

TR1

TR8

CN9

PIN IC IC IC

NO.

02 03 04

1 H

L L L

2

3 H P

4 L L

H

5

L L L

6

L L

7

L L

8

9

P

10 L

11

P

12

L

P

13

H H H

14

H

P

P L L

P

L L

P

P 3

L

P

L 7

L 8

P

P 11

P 13

LOGIC

PIN IC PIN

NO.

1

2

4

5

6

9

10

12

14 P 34

15

16 P 36 P 16

CHART

NO.

05

L 21 L 1

H 22 L 23

L 24

H

25

L 26 H

27

P 28

P

29

P

30

P

31

P 32

P

33

P

35

IC PIN IC

05

H 2 P 22 H H H 4 P

P P

P

H

H 10 L 30 H H

P P

H

Q8

NO.

P 21

P 23

3

24 H

P

5

6

7 8

9

11

12

13 L 33 P

14 15

25

P

26 L

P

27

H

28

L 29 H

H 31 H

H

32 P

34 P

L

H

35 P

P

36

IC

08

H

L

H

P

17

18

19 20

1.

2. Maintain

3. Remove

4. Use extreme

5. Use

6. Use an isolation

7. Do not remove

8.

9.

10. Periodically

11. The Printer

12. Instructions

13. Never expose

_a_

e

+

an isolation

Use

AC

line

AC power from the Printer before servicing or installing

ES devices

static electricity.

ly available discharging

Do not use freon-propelled

This Printer

not

cabinet.

sources.

Circuitry not used

Circuitry used

parts list

See

Ground

Voltages

Waveforms

are integrated circuits and semiconductors "chip"

caution when handling the printed circuit boards.

grounded-tip,

a

defeat the AC plug

is equipped

examine the

cabinet is

should

This

in some

measured

and voltages are

noted otherwise.

Voltages,

waveforms and

running in Self-Test

Waveforms

switch coupling

taken with

in Calibrate

on

AC input to

measured when necessary.

width with

of each waveform.

Item

justment

DC

numbers in rectangles appear in

instructions.

17 P 18 19

20

SAFETY PRECAUTIONS

transformer for servicing.

voltage at rated input.

Drain off any

electrostatic

wrist strap device. This

charge on

should be removed prior

low voltage soldering iron.

(times

or install board, mechanical or electrical

probe

10)

with

safety feature.

on scope.

sprays. These can generate

grounded three-pronged AC plug. This

a

AC power cord for damaged or cracked

equipped with vents to prevent heat

given,

be

could cause shock or equipment

the Printer

especially to children, that

damage.

to water. If exposed to water

SCHEMATIC NOTES

in some

"0"

reference

view waveforms

reference voltage

versions

with digital

logic readings

mode.

triggered scope

position,

voltage

meter.

taken

scope

after DC

Each

given at the

from ground,

taken with

Sweep/Time

and

input set

waveforms.

reference

waveform

bottom

the alignment/ad-

Printer

for DC

Switch to

is 7.5cm

37

P

38 H 18 P 38

L 17 P 37 P

P 39 H 19 P 39 P

L

40

H 20

electrostatically

L

sensitive devices.

components.

Some

your body

parts, or other peripherals with

electrical charges sufficient

build-up. Never block, cover, or obstruct

objects should not be dropped or pushed into

turn the unit Off. Do not

Supply

Controls

Terminal

Capacitors

Electrolytic

unless

Resistors

Value

Measurements

is

line

semiconductor devices can

by touching a

plug must fit into

insulation.

voltage

adjusted

identification

noted.

in

(

noted.

applying

to

maintained as

are 50

capacitors

V2W

are

used

)

taken

known

for

volts or

or less,

some

in

earth ground.

power to the unit

Printer AC power On.

to damage semiconductor

grounded

a

the Printer

place

shown at

operation.

normal

not be

may

less, 5%

volts

are 50

unless noted.

5%

versions.

switching as

with

P

40

H

Examples

of typical

be damaged easily

Wear

commercial-

a

under

AC power

outlet. Do

these vents.

the vents of the

near possible

input.

on unit.

found

noted.

unless

or less, 20%

shown,

test.

devices.

water

unless

by

o

ro

13

DISASSEMBLY INSTRUCTIONS

UPPER COVER REMOVAL

Remove platen knob, remove

Loosen two screws holding

switch

assembly backwards. Remove two screws from

the front of

side

upper cover

HEAD

PRINT

Remove upper

Printer. Carefully

cable connector

beneath the print head.

lift

and

head straight

PRINTER

Remove

right.

head. Remove

nector from

that fasten flat

connect

P.C.

remove

cabinet. Carefully

Printer

Disconnect print

all connectors

board.

four screws

mechanism

upper cover. Tip upper cover back

from Printer.

REMOVAL

cover, slide carriage

remove print

located on the

from

up

MECHANISM

upper cover. Slide

the flat

carriage frame

cable to side of printer

Set Printer

upright.

REMOVAL

head cable plug

cable connector screw and the

attached to P.C. board.

up

holding mechanism

remove bottom

cover

top

switch assembly and slide

assembly to right end

head cable plug from flat

carriage assembly

Push

down print head lock

the carriage assembly

carriage assembly

assembly. Cut plastic lie-wraps

side

down on a soft cloth

case

MISCELLANEOUS

pulling

by

upwards.

and lift

and remove print

mechanism.

Remove

to the bottom of

and

set printer

in-

frame

lever

frame.

far

to

con-

Dis-

and

MAIN CONTROL BOARD REMOVAL

Remove upper cover assembly. Disconnect

from Main Control Board. Remove print

Remove flat cable connector from carriage

the

Cut

side

Main Control Board.

PLATEN

of

Remove

tion.

tie-wrap

of printer mechanism. Remove

REMOVAL

cabinet

Remove two screws holding

remove paper

from right end of

side plate. Turn platen bearing

which fastens the

Lift

Main Control from

cover. Lift

top

separator. Remove

platen.

Pull left bearing side

flat

scale bar to highest

paper separator

C ring and platen

90°

and pull

CARRIAGE MOTOR REMOVAL

Remove the upper cover. Remove the Main

disconnect

Carriage Motor leads. Remove two screws fastening Carriage

from Carriage Motor pulley. Lift Carriage

Printer.

PAPER FEED MOTOR

Remove

two phillips screws fastening Paper Feed Motor

printer mechanism. Remove Paper

of

Printer.

Connector

Motor

to

upper case.

CN4. Cut the tie wraps securing

the bottom cover.

Remove carriage belt

REMOVAL

Remove Main Control Board.

ADJUSTMENTS

all

connectors

head

assembly.

frame

assembly.

cable to the right

two

screws holding

Printer.

bearing

ways from

out platen.

Control Board,

Motor

Remove

to left side

Feed Motor from

posi-

and

the the

from

CHARACTER PRINTING

FIRST

Loosen screws

Turn motor

when

the

at the home sensor

stops

Figure 1. If changing position of motor

correct the print position, change the

carriage synchro-belt

of the

teeth.

fastening Carriage Motor to bottom

assembly

a

power is turned ON, the

1mm

POSITION ADJUSTMENT

little one way

print head returns and

position within tolerance, see

the pulley by one or two

on

-0.55-0. 75mm

Home

—I Sensor

ri

TjL-LI

CN10>-

'U

a

1

Figure

PRINTHEAD ADJUSTMENT

Print head adjustment

printer mechanism, carriage assembly

Loosen carriage shaft screws on the

mechanism. Move carriage shaft

gap between

0.5mm.

or the other

cover.

so

that

assembly does not

engagement position

DETECTOR

LEVER

platen and print head is between 0.45mm

PLATEN/PAPER

Remove the

screws. Adjust

paper separator paper separator

should be

SEPARATOR

cover,

upper

clearance

the

approximately

for

screws,

see

PAPER

SEPARATOR

\

0APPROX

performed after repair of

frame, or print head.

sides of the printer

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and

ADJUSTMENT

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between

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2.

Figure

/

Figure 2

paper separator

the platen and the

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14

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Serial Port's Receiver

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Atari 1025 Technical Service Data User guide

Specifications and Main Features

Frequently Asked Questions

User Manual