Sharp 19sv111 User manual

19SV111

SHARP

SERVICE

MANUAL

S99N919SV1

111

GAME TElEVISION

SIGMA9400 CHASSIS

Chassis No.

19M1

MODEL

19SV111

In

the

interests

of

user-safety

(Required

by

safety

regulations in

some

countries) the set should

be

restored

to

its

original

condition

and

only

parts identical

to

those

specified should

be

used.

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CONTENTS

Page

• IMPORTANT

SERVICE

SAFETY

PRECAUTION

..................................................... 2

•

ELECTRICALSPECIFICATIONS

............................................................................ 3

• LOCATION

OF

USER'S

CONTROLS

...................................................................._ 4

• REMOVAL

OF

CABINET

...................................................................................._ 6

• INSTALLATION AND

SERVICE

INSTRUCTIONS

.................................................... 8

•

TROUBLE

SHOOTING

TABLE

..............

...

..............................................................

10

•

CHASSIS

LAYOUT ..................................................·......·..................·.........·........... 16

•

PRINTED

WIRING BOARD

ASSEMBLIES

...............................................................

17

•

BLOCK

DIAGRAM ··············'·························--···--···--············--····················--······

21

•

SOLID

STATE

DEVICE

BASE

DIAGRAM ...............................................................

26

• SCHEMATIC DIAGRAM ANDWAVEFORMES ..........................

..

.......

..

..........

..

...... 28

•

REPLACEMENT

PA·RTS

LIST

................................................................................

35

·• PACKING

OF

THE

SET

..........

..

...

.

...

..................

...

..

........

..

...............

..

. 44

SHARP

ELECTRONICS

CORPORATION

Service Headquarters: Sharp

PI

aza, Mahwah, New

Jersey

07

430-2135 Phone;

(20

1)

512-0055

'19SV111

IMPORTANT

SERVICE

SAFETY

PRECAUTION

• Service

w_ork

should

be

performed only by qualified service technicians who are

thoroughlyfamiliar

with

all safety checks

and

servicing guidelineswhich follow:

WARNING

1.

For

continued safety, no modification

of

any

circuitshould be attempted.

2.

Disconnect

AC

powerbeforeservicing.

3.

Semiconductor heat sinks are potential shock

hazardswhen

the

receiver

is

operating.

4.

The

chassis

in

this receiver

has

two

ground

systems which are separated by

insulation

material.

The

non-isolated (hot) ground

system

is

for

the + B voltage regulator circuit and the

horizontal

output

circuit.

The

isolated ground

sy5tem

is

for

the

low

+B

DC

voltages and the

secondary

circuit

of

the

high

voltage

transformer.

To

prevent electrical shock

use

an isolation

transformer between

the

Ii

ne

cord and power

receptacle, when servicing this

chassis.

SERVICING OF

HIGH

VOLTAGE

SYSTEM AND

PICTURE

TUBE

When servicing

the

high voltage system,

remove

the

static charge by connecting a

10k

ohm

resisto-r in

series

with

an

insulated

wire

(such

as

a

test

probe)

between

the

picture

tube

ground

and

the

anode

lead.

{AC

cord

should

be

disconnected from

AC

outlet.)

1.

Note

that

the

picture

tube

in this receiver

employs integral implosion protection.

2.

Replace

with

tube

of

the

same

type number

for

continued safety.

3.

Do

not

Iift picturetube by

the

neck.

4.

Handle

the

picture

tube

only

when

wearing

shatterproof goggles and

after

discharging the

high voltage anode completely.

X-RADIATION

AND

HIGH VOLTAGE

LIMITS

1.

All service personnel should be aware

of

the

procedures

and

instructions

covering

X-

radiation.

The

only potential source

of

X-ray

in

current solid state

TV

receivers

is

the

picture

tube. However,

the

picture tube does

not

emit

measurable

X-Ray

radiation

if

the high voltage

is

as

specified

in

the

"High

Voltage Check"

instructions.lt

is

only

when

high

voltage

is

excessive

that

X·rad

iation

is

capable

of

penetrating

the

picture

tube

shell

which

includes lead in

glass

material.

The

important

precaution

is

to

keep high voltage below the

maximum level specified.

2

2.

It

is

essential

that

servicemen have available at

all times

an

accurate high voltage meter.

The

calibration

of

this

meter should be checked

periodically.

3.

High voltage should always

be

kept at

the

rated value

-no

higher. Operation at higher

voltages may

cause

a failure

of

the picture tube

or high voltage circuitry and, under certain

conditions,

may

produce radiation

in

excess

of

desirable levels.

4.

When the high voltage regulator

is

operating

properly

there

is

no

possibility

of

an X-

radiation problem.

Every

time

a color

chassis

is

serviced, the brightness should

be

tested

while monitoring high voltage

with

a meter

to

be certain

that

it

does

notexceed the specified

value and

is

regulated correctly.

5.

Do

not

use

a picture

tube

other

than

that

specified, and do

not

make unrecommended

circuit

modifications

to

the

high

voltage

circuitry.

6.

When

trouble

shooting

and

taking

test

measurements on a receiver

with

excessively

high voltage,avoid being unnecessarily dose

to

the

receiver. Do

not

operate

the

receiver

longer than

is

necessary

to

locate the

cause

of

excessive

voltage.

FIRE

AND

SHOCK HAZARD

CHECKS

Before returning

the

receiver

to

the

user,

perform

the

following safety checks:

1.

Inspect all lead

dress

to

make certain

that

leads

are not pinched, and check

that

hardware

is

not

lodged between

the

chassis and

other

metal parts in the receiver.

2.

Inspect all protective devices such

as

non·

metallic control knobs, insulating materials,

cabinet

backs,

adjustment and

compartment

covers

or

shields, isolation resistor-capacity

networks, mechanical insulators, etc.

3.

To

be

sure

that

no shock hazard exists, check

for

current Ieakage in the foil

owing

manner:

•

PI

ug

the

AC

cord directiy

into

a

120

volt

AC

outlet, (Do

not

use

an

isolation transformer for

thistest).

• Using

two

clip

leads,

connect a 1.5k ohm,

10

watt

resistor paralleled by a

0.1SuF

capacitor in

series

with

all

exposed

metal cabinet parts

and

a known earth ground, such

as

an electrical

conduit or electrical ground connected

to

an

earth ground.

19SV111

IMPORTANT

SERVICE

SAFETY

PRECAUTION

(Continued)

•

Use

an

AC

voltmeter having

with

5000

ohm per

volt,

or

higher, sensitivity

to

measure the

AC

voltage

drop

across

the

resistor.

•

Make

contact

with

the

test

probe

on

all

exposed metal parts having a return

path

to

the

chassis

(antenna,

metal

cabinet,

screw

heads, knobs and control shafts, escutcheon,

etc.) and measure the

AC

voltage drop

across

the resistor.

All

checks must

be

repeated

with

the

AC

cord

plug connection reversed

(if

necessary,

a non-

polarized adapter plug may

be

used

only

for

the

purpose

of

completingthese

checks).

Any

current

measured must

not

exceed 0.5

milliamps.

Any

measurements

not

within

the

limits

outlined

above are

indicative

of

potential

shock hazard and corrective action must

be

taken before returning

the

set

to

the

customer.

SAFETY

NOTICE

Many electrical and mechanical parts in television

receivers

have

special

safety-related

characteristics.

These

characteristics are often

not

evident

from

visual inspection,

nor

can

protection afforded

by

them

be

necessarily

increased

by

using

rep

I

acement

components

rated

for

higher

voltage, wattage, etc.

Replacement parts which have these special

safety characteristics

are

ide

nti

fi

ed

in

this

manual; electrical components having

such

features are identified

by

".&"and

shaded areas

in

the

Replacement Parts Lists and Schematic

Diagrams.

For

continued protection, replacement

parts must

be

identical

to

those used

in

the

original

circuit.

The use

of

a

substitute

replacement parts which

do

not

have

the

same

safety characteristics

as

the

factory recommended

replacement parts shown in this service manual,

may create shock,

fire,

X-radiation

or

other

hazards.

!~

AC

VOLTMETER

TO EXPOSED

METAL

PARTS

CONNECT

TO

KNOWN

EARTH

GROUND

ELECTRICAL

SPECIFICATIONS

VHF

ANTENNA

INPUT

IMPEDANCE

...............................

,.

.....................

75

ohm Unbalanced

UHF

ANTENNA

INPUT

IMPEDANCE

......................................................

300

ohm Balanced

CONVERGENCE

.................................................................................. Magnetic

FOCUS

................................................................................................. Hi-Bi-Potential Electrostatic

AU

010

POWER

OUTPUT

RA

Tl

NG

........................................................

1.2

W (at

10%

distortion)

INTERMEDIATE

FREQUENCIES

Picture

IF

Carrier Frequency .......................................................... 45.75 MHz

Sound

IF

carrier Frequency ............................................................ 41.25 MHz

ColorSub-Carrier Frequency .......................................................... 42.17 MHz (Nominal)

PICTURE

SIZE

......................................................................................Approx.

185

sq.

in.

POWER

IN

PUT

.....................................................................................

120

V

AC

60Hz

POWER

RATING

..................................................................................

95

W

SPEAKER

SIZE

.....................................................................................

4•

PM,

0.52

oz.

Mag.

VOICE

COIL

IMPEDANCE

.........·....·................·..............................···... 8 ohm

at

400

Hz

SWEEP

DEFLECTION

........................................................................... Magnetic

TUNING

RANGES····--·

.......................................................................... VHF-Channels 2

thru

13

UHF-Channels

14

thru

83

CATV

Channels 1

thru

65,

Specificationsare subject

to

change

without

prior notice.

95

thru

99

(EIA, Channel Plan)

3

19SV111

Front

LOCATION

OF

USER'S

CONTROL

(TV)

IAntenna Terminal Board I

(Located

on

the

rear

of

the

cabinet)

r--__;

l-l-

11

1

1----#-CHANNEliNDICATOR

r----+T-

1

1-

---H-

SENSOR

AREA

FOR

REMOTE CONTROL

E,;

~

COAXIAL

CABLE

~

"~

I

CONNECTOR

LC.._I_

UHF

ANTENNA

b

_l

r--f++--+1-

MEMORY

INDICATOR

~1~~-;;~

.

S

I

~

;.

~?""~_...........,;...-l

~

lb

.

=POWER

ON-OFF B

UTIO

N

~

TERMINALS

'---

--

~

-

'L

-

f=

bJ

~~~~~~~~~

n

•l

""only)

~

ee

J

C?..;~

~

1

~I~

~

Control

Access

Door

(

How

to

open

th

e door)

To

open the

doo

r, be sure

to

push thepos

iti

on

mar

ked

"PUSH O

N".

I

LTV/CATV MODE

SELECTOR

,.---

--

CHANNEL UP/DOWN

BUTTONS

[

VOLUME ADJUSTMENT

BUTTONS

L

~.o

-

~

.t o

==

_o=

.,._

====:I

PICTURE

CONTRO

L

'----

----

TINT

CONTROL

'---

------

COLOR

CONTROL

'-----

----

BR

IG

HTNESS

CONTROL

!Infrared Remote Control I

REMOTE

CONTROL

WINDOW

CHANNEL MEMORY

0 0

BUTTONS

-t

mm

..

u•

l'

!CJ

1CJ

c:::3--l+-

SL

E

EP

BU

TTON

RANDOM

ACCESS

ee

ilL

SLEEP

CALL BUTTON

suTToNs

m m

§·

II

I

I,....

~

!CI

---I

I GAME

ON

/OFF

BUTTON

CHANNEL

UP

/

~

:;_

~

~FLA

SHBACK

BUTTON

DOWN BUTTONS

~

9

Cfl

~I

I

L POW€RON-OFF BUTTON

VOLUME ADJUSTMENT

....,_

MUTE

BUTTON

BUTTONS

"

4

GAME

ON/OFF

LOCATION

OF

USER'S CONTROL(Continued)

(GAME)

Front I Controller

CONTROL

PAD

START

BUTTON

B----'

BUTTON

A------'

CONTROLLER

PLUG

CONTROLLER

SOCKET

1

CONTROLLER

SOCKET

2

CONNECTING

THE

CONTROLLERS

TO

THE

TV

19SV111

Both

controllers

are

identical

and

may be connected

to

either

controller

socket. However,

the

controller

connected

to

controller

socket 1 becomes

Controller

1,

The

distinction

is

important

when

selecting and

starting

games, since

only

Controller

1 is used

to

select and start games.

CONTROLLER

SOCKET

2

CONTROLLERS

CONTROLLER

SOCKET

1

Operation

of

Controls (GAME)

1.

Turn

the

power

on

by

pressing

the

POWER

0 N·OFFBUTTON

on

the

set

or

on

the

Remote Control.

2.

Set

the

TV

mode

by

pressing

the

TV/GAME

SELECTOR

on

the

set

or

on

the

Remote Control.

CAUTION:

ALWAYS

MAKE

SURE

THE TVIGAME

SELECTOR

IS

SET

THE

TV

MODE

BEFORE INSERTING OR

REMOVING A GAME PAK.

5

19SV111

REMOVAl

OF

CABINET

How

to

detach

the

game

unit

from

the

TV set

1.

Unscrew thesix re

ar

cabinet set-screws and remove

the

rea

r cabi

net

.

2. Disconnect

the

game

unit

connectors

(EB,

N,

V, A and

EA)

from

the

TV

set.

3. Place

the

TV

set upside

down.

4. Unscrew

the

fou

r game

unit

s

et

-screws

from

the

TV

set.

Now

the

gameun

it

can be detached

from

the

TV

se

t.

6

19SV111

REMOVAL

OF

CABINET

(continued)

How

to detach

the

game unitfrom

the

cabinet

1. Unscrew

the

eight

top

cabinetset-screwsand remove

the

top

cabinet.

2.

Unscrew

the

eleven shielding

case

set-screws and

the

four

chass

is set-screws.

Now

the

game

PWB

(PWB-D) can be

drawn

out

.

7

19SV11

'I

INSTALLATION

AND

SERVICE

INSTRUCTIONS

Note: (1) When

performing

any adjustments

to

resistor controls and transformers use

non-metallicscrewdriver

or

TV

alignment

tools.

(2) Before

perfoming

adjustment,

TV

set mustbe on

at

least 15 minutes.

CIRCUIT

PROTECTION

The receiver is protected

by

a 4.0A fuse

(F701),

mounted

on

PWB-A,

wired

into

one side

of

the

AC

line

input.

X-RADIATION PROTECTOR CIRCUIT

TEST

After

service has been

perlormed

on

the

horizontal

deflection

system,

high

voltage

system,

or+

B

system,

the

X-

Radiation

protection

circuit

must

be

tested

for

proper

operation

as

follows:

1.

Apply

120V

AC

using a variac transformer

for

accurate

input

voltage.

2.

Allow

for

warm

up

and

adjust

all

customer

controls

for

norma

I

picture

and sound.

3.

Check

the

voltage

of

test

point

TP601.

(It's

voltage should be

about

18V

DC.)

4.

Connect

the

pin (6)

of

IC501

to

TP601

through

a short

clip

lead.

In

this

case,

the

operation

of

horizontal

oscillator

is

stopped.

5.

To

start

operation,

remove

the

above short clip

lead and

touch

the

TP602

to

chassis

ground

(TP603)

with

a

short

clip

lead. In

this

case

remove

short

cIip Iead

as

soon

as

the

set

operates again

with

a normal picture.

6.

Connect

TP651

to

TP652

and

see

that

the

operation

of

horizontal

oscillator

then

stops.

Next, make sure

that

the

set operates

with

a

normal

picture

by

the

method

of

StepS.

7.

If

the

operation

of

the

horizontal

osc.

does

not

stop in steps 4

and

6,

the

circuit

must

be

repaired

before

the

set

is

returned

to

the

customer.

8

HIGH

VOLTAGE

CHECK

High voltage

is

not

adjustable

but

niust

be checked

to

verify

that

the receiver

is

operating

within

safe

and

efficient

design

limitations

as

specified checks

should be

as

follows:

1.

Connect an accurate

high

voltage

meter

to

the

CRT

anode.

2.

Operate receiver

for

at

least

15

minutes

at

120V

AC

line voltage,

with

strong

air

signal

or

a

properIy

tuned

in test signa

I.

3.

Set SW851

on

PWB-B

to

"OFF"

(center)

position.

Note

that

I

o.ss

of

Iuminance

wi

11

occur.

4.

Rotate Screen control (on T652)

to

minimum

(CCW)

end

of

its rotation.

5.

The reading

sho.uld

be

approximately 26.5kV

at

zero beam.

If

a correct reading cannot be

obtained,

check

circuitry

for

malfunctioning

components.

Upon

completion

of

voltage

check,

readjust

screen control

for

proper

operation

and set

SW851

to

"ON"

position.

19SV111

INSTALLATION AND SERVICE INSTRUCTIONS

(Continued)

FIELD ADJUSTMENT

•

RF-AGCADJUSTMENT

1.

Select a local channel.

2.

Turn RF-AGCcontrol

(R214)

fully

ciO<kwise.

As

a

result

noise appears

on

picture,

then

slowly

turn

the

RF-AGC

control

(R214)

counterclockwise

until

noise disappears.

3.

Check

that

no noiseappears

on

other

channels.

• SUB-BRIGHTNESS CONTROL

1.

Select a local channel.

2.

Turn

Picture

control

(a

part

of

R462)

fully

clockwise and set Brightness control

(a

part

of

R462)

at

the

center position.

3.

Turn Sub-Brightness control

(a

part

of

R462)

to

obtain normal brightness

of

the

picture.

•

HORIZONTAL

CENTERING

1.

Select a local channel.

2.

Adjust

the

Horizontal

Centering

Switch

(SW7

51

) on

PWB-C

to

best picture position.

• VERTICAL

SIZE

ADJUSTMENT

1.

Select a local channel.

2.

Turn

fully

counterclockwise

the

Brightness and

Picture

controls

to

dim

screen (in

the

state

where

the top

and

bottom

of

picture

cam

be

recognized.}

3.

Adjust Vertical Size control

{a

part

of

R462)

for

approximately 1/8

to

1/4 inch over-scan

at

top

and

bottom

of

picture screen.

• FOCUS ADJUSTMENT

1. Select a Iocal channel.

2.

Set Brightness and Picture controls

at

a normal

viewing

level.

3.

Adjust focus control (part

of

T652)

for

sharp

scanning lines and/or sharp picture.

9

NOTE

1:

All

field

adj-Ustments

mentioned

can be

performed

without

testequipment.

NOTE

2:

As this model

has

"Built

in

AFT", AFT is

always in

"ON"

position.

If

AFT

should

be "OFF",

short

between

TP1003

and

TP1004.

NOTE

3:

After

servicing the

set

check

that

the

aging

switch

SW1801 is

set

at

"OFF"

position.

This

aging switch is

to

be used

only

for

the factory inspection;

at

"ONH

position,

it

won't

allow

the

set

to

be

turned

off.

195V111

TROUBLE SHOOTING TABLE

Malfunctions

not

Traceable

to

Game Deck

Display Fails

to

Appe-a (o.nly noise)

I

Is

TV

operation

normal,

when

select

the

TV/GAME switch

to

TV

position?

Yes

\

~

r---··---,

1Check

the

Lead I No

1

Wire

"oc•. 1

L-------J

Is

there

DC

1

OV

at

....

N_o_.....,.

(1)

of

IC101

on

PWB-E?

Check

the

T1

01

AC

r--No_---1 120V supply{Across

EA

1and EA2)?

,~

r----··----,

Yes

No

'

lr

Is

there

DC

SV

at

Connector "EC1"

on PWB-E?

Yes

'~

r--

-·

...

--

-,

ICheck IC101,

C107

I

I and

C108.

I

L-------J

1

Check connector

"EA",

1

I connector "Hn and I

Lead

wire

"H".

No

Is

there

DC

OV

at

....----tcollector

of

Q101?

...,..._

.......

Yes

L--,._-

...

_~'11111111111-J

'

r

Ch;ck

Rto7.-

-,

Q101, D102, I

1 Connector "EB" 1

1 and 1

I Lead

Wire

"EB". I

L-------J

10

r

.....

..-.~

..........

___

,

ICheck T101, D101, I

I C104 and RY101. I

L

_______

J

Yes

I

19SV111

TROUBLE

SHOOTING

TABLE

(Continued)

Controller

Doeswt

Function.

Yes

Controller

faulty.

Selection and

starting

not

possible

or

selection mark

continues moving.

Do

symptoms change

when

controller

cord

bent?

No

Yes

It

r--·

..

--,

:

Controller

:

I cord

faulty.

I

L

_____

J

Is

controller

plug-

to-

socket

contact

good?

'~

~Ched.;,;r~l;,

;rd

~

soldenng cond1t1on, 1

:wire

broken

or

1

shorted.

L

________

.J

Is

problem corrected by replacing controller ?

Pause

occurs

during

game

or

pause occurs

when

button

A

pressed

during

game.

Controller

cord

faulty.

r

___

j ____,

: Check some :

1 buttons. 1

L--------.J

Some buttons

don't

operate

or

some

buttons

remain ON.

Are

button

contacts

OK?

No

j

Yes

'

rche~

tl;e-PWBin7id"";

~

1

the

controller. 1

I(Checks and

ford

irty

1

Lo:_d:_m_:ged

~o~t~~·

.J

11

No

Game Deck faulty.

Are

controller

socket

pins and harnesses

(PWB-G)

OK?

Check

continuity

between

controller

socket (PWB-G) and

Game

Unit.

r--------,

I I

I Game

Unit

faulty. I

I I

L--------J

19SV111

TROUBLE

SHOOTING

TABLE

(Continued)

MalfunctionsTraceable

to

Game Deck

* Prior

to

replacing parts:

Check

the

following

items before referring

to

the tables

on

the

following

pages and

repairing

the

Game

Unit.

1.

Check

the

contact

condition

of

card

connector

72P.

2.

Check

the

soldering

of

all parts.

3.

Visually inspect

for

short circuits.

4. Check

that

all parts are

mounted

correctly.

5. Check

for

ICs

that

heat

up

abnormally

while

power

is

on

(other

than

ICS

PPU).

6.

Check

for

splitting

or

cracks

in

the

resistor arrays, ceramic capacitors, ceramic osci

II

ators,

etc.

Symptom

Repair Procedure

Display

in

One Color

Sound

normal.

Sound

normal.

1.

Check

for

faulty

soldering.

ICS

PPU

faulty.

1. Check

for

faulty

parts

or

faulty

soldering near

the

crystal oscillators (labeled

X1

and

X2

on

the

Game

Unit).

2.

Measure

the

osci!!

ati

on

frequency

and

input

voltage

at

IC6

CPU

pin (29) and res

PPU

pin (18).

The oscillation frequency should be 21.5 MHz.

(see

diagram

below}.

3.

Measure

the

oscir

ration

frequency

and

input

voltage

at

rC10

CIC

pin (6) . The

oscillation

frequency

should be 4 M

Hz.

(see

diagram

below).

4.

Check soldering

for

IC6

CPU,

IC1

5-RAM

and

IC3.

Faulty rc6

CPU,

ret 5-RAM, res

PPU,

rc3

or

IC9.

Location

of

Fault

(in

order

of

probability)

(1)

ICS

PPU

(1) IC6CPU

(2)

IC1

5-RAM

(3)

ICS

PPU

{4)

X1, X2

(5) 1(3

(6)

1(7,

1(8

(7) MP1, MP2

(8)

IC9

(9)

Card connector

"DE" 72P

(1

0)

Faulty

soldering

or

a

break

in

the

conductor

pattern.

4MHz

2 t.5 MHz (NTSC)

230

ns

12

19SV111

TROUBLE

SHOOTING

TABLE <continued)

Symptom

Display Black

Sound

normal.

No

sound.

Repair Procedure

1.

Make

sure

that

picture

signal

is

being

output

from

ICS

PPU

(21).

2.

Make

sure

that

soldering

for

Q1,

FC2,

Q4,

l1,

R23

and

R2

is

secure.

3.

Check

for

other

faulty

soldering

or

breaks in

the

conductor

pattern.

1.

Is

there

faulty

soldering

or

a fauI

ty

part

in

the

asci

llation

circuit

(near X

1,

02

or

03)

?

2_

Are

oscillation

frequencies

and

input

voltage

levels

of

ICG

CPU

(29) and

ICS

PPU

(18)

normal?

Faulty

soldering

or

a

break

in

the

conductor

pattern.

Location

of

Fault

(in

order

of

probability)

(1)

ICSPPU

(2) Faulty

soldering

or

a

break in

the

conductor

pattern.

(1) Xl

(2) Faulty

soldering

or

a

break

in

the

conductor

pattern.

(3)

IC10

~----------------~------------------~------------------~------------------·--

Display Flashes

1.

Is

the

Game Pack

normal'

Is

it

installed

correctly?

(1) 1(10

2.

Is

there

any fauIty

soldering

or

a

break

in

the

(2) Card

connector

conductor

pattern

I

"DE"

72P

Display

repeatedly

3.

Is

1(1

0

faulty.,

(3) Faulty

soldering

or

a

appears

and

dies.

IC9

faulty.

break

in

the

conductor

pattern_

(4) 1(9

Normal Display Doesn't Appear

Abnormality

occurs

1.

Heat

up

ICS

PPU

using a

hair

dryer

or

the

I

ike_

(1)

ICS

PPU

after

playing

the

If

faulty

symptoms

appear,

then

the

PPU

is

faulty.

(2)

iC6

CPU

game

for

a

long

2_

Heat

up

ICG

CPU

using a

hair

dryer

or

the

like_

time.

If

faulty

symptoms appear,

then

the

CPU

is

faulty.

1.

Is

there

faulty

soldering

or

a

break

in

the

(

1)

IC45-RAM

conductor

pattern

in

or

near

IC4

S·RAM,

IC2,

IC9

(2)

IC2

HC

139

orca

rd

connector

"DE"

72P

? (3) Faulty

soldering

or

a

Moving

characters

2.

Is

IC4

5-RAM, IC2, 1(9 HCU04P

or

lC5

PPU

faulty?

break

in

the

OK,

But

non-

Card

connector

"DE"

72P

faulty.

conductor

pattern.

moving

characters (4)

IC9

and

background

(5) Card

connector

abnormal.

"DE"

72P

(6)

IC5

PPU

13

19SV111

TROUBLE

SHOOTI~G

TABLE<continued)

Symptom

Repair Procedure Location

of

Fault

(in

order

of

probability)

Normal Display Doesnlt Appear

1.

Check

soldering

and

make

sure

that

the

correct

(1) Misadjusted

CSO

parts are

mounted

and

that

they

are

mounted

in

trimmer

capacitor.

the

correct

direction

near

resistor

R2

and in

the

(2) Faulty

soldering

or

Poor

or

no

color

in asci

llator

circuit

(the

area

containing

X

1,

Q2

and erroneous

picture.

Q3).

mounting.

Adjust

trim

mer

capacitor

CSO

and

match

to

(3)

X1

normal

chroma frequency. (4)

ICS

PPU

Normal Display, But

Operation

Via Controller

Not

Possible

Game Select

symbol

1.

Is

ICS

PPU

faulty?

(1)

ICS

PPU

does

not

appear,

or

Faulty

IC6

CPU.

(2)

IC6

CPU

is

shaped

abnormally

ifit

does

appear.

1.

Is

there

faulty

soldering

or

a

break

1n

the

(1) MP1, MP2

Game Select

symbol

conductor

Pattern

in

MP1

or

MP2 ? (2)

C7

keeps

moving.

2.

Is

there

faulty

soldering

or

a

break

in

the

(3)

IC6

CPU

conductor

Pattern in

IC7

or

IC6

CPU

?

Faulty

IC7

or

IC6

CPU.

1.

Is

the

controller

harness

secu

rei yconnected ? (1)

IC7

Controller

I 2

Is

there

faulty

soldering

or

a

break

1n

the

(2) Faulty

soldering

or

a

is

inoperable

conductor

Pattern near

IC7

or

IC6

CPU? break

in

the

(Game Select

not

Faulty

IC7

or

IC6

CPU.

conductor

pattern.

possible).

(3)

IC6CPU

(4) MP1, MP2

1.

Is

the

controller

harness

secu

rei y connected ? (1) 1(8

Controller

II

2.

Is

there

faulty

soldering

or

a

break

in

the

(2)

Faulty

soldering

or

a

is

inoperable

conductor

Pattern near

1(8

or

1(6

CPU

?

break

in

the

Faulty

ICB

or

I

C6

CPU.

conductor

pattern.

(3)

IC6CPU

(4) MP1, MP2

14

19SV111

TROUBLE SHOOTING TABLE ccontinued)

Symptom

Repair Procedure Location

of

Fault

(in order

of

probability)

Display Normal, But Sound Abnormal

1.

Is

there

faulty

soldering

cr

a

break

in

the

(1)

IC6

CPU

conductor

pattern

in

R3, R4, R6,

R7

or

RS;

(2) Faulty soldering

or

a

Abnormal

melody.

Faulty

IC6

CPU.

break in

the

conductor

pattern.

1.

Is

there

faulty

soldering

or

a

break

in

the

(1)

IC9

HCU04

conductor

pattern

near

IC9,

C23,

QS,

R21,

(48

or

(2)

1(6

CPU

FC1?

(3)

C23,

FC1,

QS,

R21,

No sound.

2.

Is

IC9

faulty

?

C48

3.

Are

there

breaks in

the

conductor

pattern

near (4) Faulty soldering

or

a

the

audio

signal

circuit?

break in

the

4.

Faulty I

C6

CPU.

conductor

pattern.

15

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2 3 4 5 6 7 8 9

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22

Sharp 19SV111 User manual

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