Atari SM125 Service manual

--.! '

:--

)I~ATARf

..

,-,

sM12s·

High-Resolution Monochrome Monitor

/ \. ;

:::

._

:

·~

.

..

.

./

For Use

with

All ATARI

STTM

Personal

Computers

SERVICE'S

MANUAL

IiiTRODUCTIO!J

The

following safety maintaining

1.

Twelve

AC

Frequency

Catliode

Scanning

Input Polarity

Resolution

general

precautions

the

inch

Input

Response

Ray

Frequency

Impedance/

perfor~ance

monochro~e

Tube

characteristics,

are

provided

of

display

electrical

for

your

the

monitor.

characteristics.

2 3 0 V A C , 5 0 It z 2 2

.

AC,

Videosignal Rise

12

inches

60Hz

and

(ju~per

bandl-ddth:

at

CRT

fall

±

deflection Neck

size:

Phosophor:

Screen

effect:

Vertical Horizontal

640

x

t.oo

dots

information

i·J

a t t s

wire

30ilHz cathode time:

0.5

inches

20mm P193

X=

Y=

CIE

0.307

0.350

cheoical

71.41Hz

35.714KHz

2K

ohr.1 I negative

2!{ ohr:t I

specifications

and

i·l

a x i m u

selectable)

-3d8

10nsec.:

diagonal

color

::::

0.02

±

0.02

etching

neg<Jtive

\

\.

use

1:1

c r 1 1 5 V

at

3iJVp-p

coordinate

an~

in

GeoQetric Line

a r i t'y·

Ambient

Humidty

C.ontrols

Distor~ion/

Temperature

..,

:

t·Jithin

0°C

to

ooc

to

zo;~

to

A.

Internal:

Sub-Brightness

V-Linearity

.

Focus

H-Uidth

8+

li-Phase V-Hold V-Size

10;~

55°C 65°C

90;~

12V

(operating) (storage)

r.H

adjustment

0.

;;r.ternal:

arightness

Volume

On/Off

S~J

2.

Dimensions

\I

eight

Adjustments

2.1

2.2

Orightness

Procedure:

Step

Vertical

adjustment

1 •

2.

3.

4.

size/Linearity

Approx .323

.

Approx

.

C6nnect

P.otate moximum.

notate

VR302·

Adjust

·

desired

7.SI~g

input

external

internal

to

the

extern~l

brightness

adjustment

x

323

signal

brightness

threshold

x

325

m~

cable.

control

sub-brightness

of

the

brightness

level.

(W

x 0 x

raster.

VR

VR303

control

for

\

H)

to

the

tC'

'-·.

·

Procedure:

Step

1 •

2.

3.

4.

Connect output used.

Rotate

until

Rotate VR203, cha.racters center

Readjust

obtai·nec.l.

optimum

characters.

2

a

is

the

until

VR202

test

identical

vertical

size

vertical

are

until

pattern

to

display

extreme equal

size

the

generator

the

signal

control is

linearity

top

in

desired

obtained.

and

height

Yhose

normally

VR202,

control

bottoCl

to

height

the

is

2.3

Focus

adjustment

Procedure:

···-..

3.

,-·

!

(\

2.4

Safety

ICE:

l·lOT

The the near the

o~timum

focus

the

monitor.

naster

Procedure:

Step

precautions

Observe

inside

control

center

centering

1 •

3.

4.

all

the

focus

·and

receiver

··

,

HARIHNG

of

the

VP.304,

approximately

adjustment

Adjust that

all

Reposition raster

Readjust to

specified

Secure C?.T

using

slipping

cautions

cabinet

monitor

for

vertical

edges

the

centering.

t~e

vertical

and

bond

hot

off.

and

is

obtained

best

focus

1/3

size

of

the

YOKE

into

dimensions.

the

YOKE

melt

safety

and

at

down

from

control, raster

the

size

to

adhesive

the

receiver

by

a

point

the

are

CRT

control,

the

neck

to

notes

adjusting

that top

VR202,

visibt~.~

for

VR2G2,

of

prevent

\

located

chassis.

is

of

so

best

th~

x-~adiation

To

avoid

protective

Lluring

See

service

To Do rain

i!arning

possible measures

Servicing

instructions

adjustments.

prevent not

expose

or

fire

moisture.

ex~osure

for

personnel.

this

or

for

shock

a·ppli~nce

to

specified

3

haz~rd

to

X-~adiation

r e p l a c e

t a

I~

r.1

e

e n t

X-Radiation

parts

and

I.

1\

O?~H1\

• S

T ro;.j

iJ

I T C H 1 i I G

Ti~Eo:n

i·l

0 D E P 0

lJ

E ~ S U P P L Y

1.0

2.0

t"?~)

·,

__

Scope

The output power

General

2.1

2.2

2.3

chapter

(12Vl,

supply

Specifications

AC

operation

AC

operation

DC

0/P

provides

single

CS.~.P.S.).

voltage

frequency

regulation

service phase

I/P

information

input

: 120VAC

1/?

:

.

(120

(130

47

12

for

or

240

(90

- 260VAC)

63

±

1%

VDC

a

22

VAC)

-

13UVACl_or

Hz

for

\:a

t t s s i n g l

SHitching-mode

24JVAC

~-

~

Vo1;

±5%

.:

for

Vo2

3.0

2.4

DC

Theory

Reference

0/P

of

operatton

to

current

Figure

1,

S.H.P.S.

:

block

1 • 2

for

1.SA

Vo2

diagram

for

and

Vo1;

Finure

300

circ~it

rnA

diagram.

'

3.1

8loc~

diagram.

descripti~n-

\.

The

AC

line

'

t h e l i n e f i l

CSW700)

produce

is

about

capacitors

(R705, power converts

C716

transformer

the

oscilation

appropriate

by

half L702 regulated

modulator R706

wave

etc).

by

(ZD702,

etc).

is

connected

t' e r.

( L 7 0 1 , C 7 U

turned

300

on. VDC

CC710,

etc)

m~ke

CT701)

300

VDC

square

le~el

for

rectification.

The

the

outputs

paver

0702-

from

C712)

the

to

wave

the

transformer

4

to

rectifier

·t

- C 7 0 4 ) ,

The

rectifier

the'J\C

are

charged,

switching

operate.

35.714KHz

and

transfers output and

LC

are

Q704

etc)

voltage filter

12

C:>701

\.J

h

and

line.

circuit

The·

(Horizontal

the

VDC

which

that

and

control

driye

- D7iJ4)

en

· t h e p o DC After

the

power

high

which

CD712,

are

\~

filter

the

start

(Q701)

transformer

Frequency)

voltage

is

C722,

sensed

duty.

circuit

tlfrou9:1

e r s w i t c h

circuit

input

circuit

and

the

to

produceri

C723,

and

cycle

CC71~~

~

......

~Q

Circuit

The

description

following

paragraphs

describe

each

block

ot

the

Block

Diagram

4.1

4.2

4.3

~ectifier

ll

hen

the

operation

rectifier

300

VDC.

Rectifier

When wire

the

J701

used -as

connection.

approximate

Start

When

circuit,

th~

circuit

transfori.ler

transfers

and

paYer

a

rectiiier

ma~e

it

DC

power

the

(0701

DC

should

bridge

In

300

Switching

the converts to

filter

supply

jumper

-

0704)

filter

supply

be

rather

this

VDC.

switching

the

(120

is

wire

J701

is

(240

is

connected

open.

than

case,

circuit,

output

is circuit

300

VDC

appropriate

VAC

operation)

connected

should

connected

VAC

operation)

That

a

doubler

the

Power

reaching

to

35.714:~!iz

Level

for

be

as

doubler

for

240

rectifier

as

rectifier

transformer

300

operation,

for

short.

VAC,

in

output

VDC,

square

the

120

the

then

outp~t-

Vi\C That

producting

.........

the

jumper

circuit

120

is

-

the

~iave

·,

\.

Line

the

_

..

is

VAC

also

start power

and

4.4

4.5

Duty

(ZD709) voltage of

operation

Isolation

cycle

adjustment

the

transformer,

modJlator

modulator

to

compare

will

transforme~

be

VR701)

comp~eted.

I t m a k e s t h e o s c i L L a t i synchronize

with

the

~

drive

provide

with

output

that

so

duty

(T702)

on

f r e

horizontal

5

circuit

cycle

que

a

reference

voltage

control

modulation

n.c

y o f t

frequency.

voltag~

sensor

the

feedbatk

and

he

s \J i t c h i n g c i r c u i t

DC

(12V

switching

6.2V

output

voltage

C.

'CRT CIRCUIT

The

video

4 0 1 S;

video The

peaking

0403

is

signal

17

'•

0 6 i s u t i l i z e d a s v i d

amplifier

coil

a

protection

is

gain L401

appliec

is is

diode.

decided comp2nsated

to

the

eo

in;:>ut

b u f f e r I f o r

by

~407,

for

conn;?ctor

me

and

load

video

frequency

cnjlc.

Tlle

r c i r c u i t • T

resisior

~415.

response.

.!C

il

:!

'-.. ··

(

;

'.

:ligh voltage. thousand filtered collector. a grid.

improve

VE~HICAL

3.1

3.2

...

··

voltage

normal

VR304

focus.

CIRCUIT

The

in incorporated

1)

2)

3)

4)

5)

Oscillator

The of oscillator.

is

"CAUTIOII".

volts.

by

C406

·

600

Grid

Volts

to

G2

adjust

vertical

a

12.-

lead

Synchronization Oscillator

U i g.h p o

Flyback

Voltage

1-1

e r g a i n a

generator

regulator

circuit

vertical

IC201,

VR201

applied

D

311 maintain

is rectified

IC

TDA117u

quad

are:

and

sync

The

0202,

tc

the

This

is

r e c t i f i e d t

at

the

acceleration

byD309

the

focus

::

i!;

in-line

circuit

ramp

r.1

p l i

generator

fie

pulses adjusts

C210

very

a

plastic

are

the is

C~T

nor~al

voltage

a

r

bulb

high

:1

e p u l

40 grid

and

C31J,

from

monolithic

package.

coupled

fr~quency

made

up· of

to

voltage,

sa

from

Volts

and

-100V

integr2ted

through

_ pump up

provide

is is

u4

is

C201

of

aquada~

over

f l y used

several

ba-c-k .-then

for

maintained

the

to

600V

circuit

The

functions

'

\_

to

the

vertical

voltage.

Q402

at

focus

to

.....

3.3

Vertical

~he

vertical

IC201.

amplifier.

The

vertical

adjusted

output

R212,

by

sweep

C205,

R209,

size VR202.

VR203.

output

R211

R210

of

·

the

The

6

is

are

ar~

raster

linearity

obtained

made

AC

feedback.

or

at

up

of

amplituda

of

the

4,

DC

Gf

vertical

10

f e e

the

and

db

sweep sweep

a c

11

of

!~

o f

is is

i: • H 0

IU

Z 0 i H

.'~

L C I

!'l

C

tJ

IT

F.

liiGH

The high-stability varied external

widt~

tw

(out) The the

aquadag G2. out"put

approximat~Ly

con

t r o l s t

VOLTAGE

High output

_

the

transformer

IC301

over

timing

is

defined

=

flyback

The

of

SUPPLY

voltage

of

SH74LS221

one

9

components,

Cext

Rext

transformer

voltage

deflection

Q302.

190Vp-p,

!t

e h

or

i z

CirlCUIT

is

the

flyback

housing.

is

a

dual,

shot.

decades

of

The

timing C303

by

the

relationship:

ln

2 =

0.7

generates

of

the

CRT. A

coil

on

t a l L i n e a r i t y • C 3 0 7 i s a

obtained

current

L3Q2

by

adjust

transformer

monolithic,

output

by

and

Cext

Rext. the secdbndary

source

The

amplitude

horizontal

rectification

T301.

pulse proper

R304,

high

is.also

This

non-retriggerable,

width,

selection

C304

voltDge

and

necessary

winding

obtained

of

tne

width,

S-s hap

of

diode

i n g

the

is

tw

R303.

sup~lied

· p·a-Lse and

capac i tor

high

molded

\

\.

can of

Pulse

from

voltase

~e

the

for G1;

the

is

L303

•

into

G.

AUDIO

CI~CUIT

The from

ICS01

pin coupled pin

5

to

compensation

RS04, the CS02

C504

high-frequency

is

matching

C506

are

capacitor.

is

an

6. from

the

Pin pin

speaker.

capacitor

can

a

DC

·block

components

the

.·,

audio

4

is

3

and

increase

oscillation.

signal

amplifier. the

after

VR501

to

the

capacitor.

RSD1

is

coupling

ground

amplified

avoid

high

the

7

The

Lead.

is

volume

from

hish

frequency

RS02

is

R503,

bias

resistor.

capacitor.

power

The

input

the

output

adjustment.

frequency

Loading

a

voltage

C507

CSOu

supply

audio signal

are • the

C501,

is

oscill~tion.

and gain

provided

signal

is

CSQS

keep

resistor. impedance C51G

the

fro~

is

from

filter

is

a

and

I

S~~VIC~

The The The

servic~

theory

floto~

~OT~S

notes

of

operation

charts

given

in

this

here in

chapter

are

ci1apter

to

II

should

be

utilized

can

help

be

used

isolate

in

m~intaining

for

monitor.

norr.~~L

~ny

o;Jer.1tion.

given

failed

component.

l

..

,.--

·

.....

1.

2.

__ _

3.

'

Circuit

Co~ponent

circuit names on

and

the

Component

~emoval

fact the

are

that component

not inserted heated, copper

General

The

brightneis

up

, t h e e

in

Fig.

does,

then

go voltage using voltage

Follow

dead,

the

one

tracing

reference

board

boa~d

chassis

re~oval

cooponents

fhe

bent

directly

the

to

terminal

schematic

circuitry

leads

or

solder

nu~bers

facilitate

from

are

crimped.

over

is

circuit

numbers

diagr~m

the

appears

inserted

the

draun

are

printer

are

in

etched

on

one straight

The

nozzle

component

3way

leaving

tracing.

also

this

board

plating.

troubleshooting

control

:<

a m i n a t i o n o f t h e u n i t s h o u l d f o l l o

2.

this

to

and

the

but

the

regullr

no

video

and

Does

means

horizontal

a

visible

diagnostic

both

the

that

fuses

should

unit

high

diagnostic

raster,

diagnostic

raster,

prob~bly

be

have

voltage

flow

adjusted

a

high

then flow there

chart.

bloun.

is flow

the·proble~

chart.

on

shown

manual.

~ide

of

lead

frequency being

chart~

is

probably If

top

In

is

facilitated of through

the

and

th~

to

maxi~uu,

1-1

t h e f l o

gener~ted~

the

~nd

addition,

and

the

board

the soldering when

lead

free

sound?

If

may

If

there

a

video unit

bottom

are

referenced

··

-

...

only

holes

sufficiently

free

when

~~

c h a r t s h o

there

be

diagnosed

is

co~~letely

of control

.

.·

by

gun

power

If

if

is

preble~.

the

the and and

is

t~e

:-

1 n

it not high

hig~

1

4.

Troubleshooting

~ig.

isolating Is broken emitter

0402

If bad

3

there

connections

exists?

waveforu

or

there

contains

the

a

of

collector precautions

uquadag

voltage

video

malfunctioing

video

Q4U2

source

exists,

If

of

the

may

be

waveform

to

handle

built

or

not,

e~itter

a exist,

circuit

a

step-by-step

connected

a

Loose

then

bad

the

up

on

cooponents

connector.

see

if

Q402

of

G402

passive

the

CUT

the

8

to

the

tl1e

wavefor8 or not

component

C2T

is

and

C~T.

troubleshooting

in

yo~r

~onochrome

unit?

If

the of

video

exist,

3+

in

is

IC4Q•

this

probable

reme~~er

If

not,

Haveform

the

defective. or

area. bad. to

discharge

guide

check

collector

G4Q1

·Use

for

diplay.

tor

of

the

may

If

G4Q2

safet;

th~

cf

be

~ -

·

Troubl~shooting

vertical

circuit

6.

7.

The

the

i

mage,

vertical unit

c

he

h~s

defective vertical

feH

probler:ts

circuit

Troubleshooting

The

in work wavefrorn the

horizont~l

wavefrom flyback

is

horizontal

Fig.

forward.

problem

pro~ably

4

is·present

of

is

Troubleshooting

If

the

horizontal

the

unit

voltages.

Lands

Voltage

lilUSt

or

be

defactive

is

replaced.

cirtuit only

c

!~

the

or

a

pa~sive

have

horizontal

circuits

The

Is

is

flyback

B~S~

probably

defective.

high

is

probably

If

not~

not

in

a

horizontal

de

f l e c t i

components being been

contained

encountered

methodology

wavefrom

but

usually

transformer.

0302

present?

bad~

voltage

processing

generating

then

diodes.

accessible.

general

on

circuit

~re

diagnosed

of there a

broken

If

circuit

check

ar~

line

Y

•)

:~

E f o r a s

is

in

used,

coLLector

is

no

printed

If

so,

wavefrom

and

sweep

~oth

for

The

rectifier

The

horizontal

all

cont~ined

or

a

very

bad.

one

integrat~d

this

using

is

to

pu~se

high

voltage

board

waveform

then is

not

generator

the

broken

distort~d

i1

or t or

Due

are<:~.

the

start

0302

is

0302

present,

bootstrap

printed diode

fl~back

in

to

floH

at

being

land

not

or

are

for

IC2J1.

I C 2 01

the

circuit~

chart the present?

generated,

aroun~

present,'

the

horizontal then

functioning, and

circuit

the transformer

'

\

vertical

lil

~

i'

co~plete

very

shown

back

_the

IC301

aquadag

board

quadag

If

::,

and

If

is

e

B.

Mechanical

3.1

CRT

A.

3.

c.

D.

E.

F.

adjustments

replacement

Remove

Loosen

deflection

Remove

Take

Re~ovc

the

off

the

•

the

th~

the

anode

C~T

screw

YQi.(E

fou·r

CRT

cap

SOCKET

of

from

screws.

ground

from

9

from

the CRT

connector.

cabinet

CRT

small

CRT

deflection

COilE.

•

cavity

GASE.

Yoke,

cap.

rc;.~ove

the

---

-

···-·

.

-

--:----

--·-

. . ..

·-

.

j . · -

·

-:

·

· - ··· ·· .. . .

·

.......

. . . · -

I

! •

! . .

-·1

.

j

'

\.

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Atari SM125 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual