Sharp mz-1d04 Service Manual

-

SHARP

SERVICE MANUAL

CODE: OO

ZMZID04/1IE

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FOR SAFER SERVICING

AND

SAFETY

CHECK-OUT

Please pay special attention to the following conditions during servicing and check-out.

1.

Observe cautions

Where

special attention

is

required on such

as

cabinet,

chassis, and component parts

is

noted with caution using
label or stamp.
You

have

to observe there cautions

as

well

as

those

in

Instruction Manual.

2.

Use

parts

of

rated performance

Since parts component used

in

the unit has specific rating

for safety performance such

as

non-inflamability, voltage

withstanding, etc.,

use

the item

of

identical characteristics.

Among

all,

parts components indicated with the "

&.

" mark

in the circuit diagram and parts list must

be

equal

in

its

property

as

it

is

critical to the performance

of

the unit.

3. Replace

the

parts and wiring

on

their original locations

For safety's sake, some

of

items are protected with

in-

sulating materials such

as

tube and tape, or the printed

board

is

isolated from other components. Also, internal

wirings

are

installed and held by such

as

clamp

to

keep
them away from heat generating component and high
tension parts. Whereas, these wirings

have

to be installed

back to their original locations.

2

4. Handle

the

CRT with care

The explosion-proof cathod ray tube

is

guaranteed

of

its

safety against explosion

as

long as it

is

installed in the

unit. However, pay special attention when it

was

removed

from the unit or when servicing it from the back

of

the
unit.
Never

give

impact

of

the cone section.

5. X-ray

The CRT and high tension circuits

have

safety measures

against X-ray. Therefore,

use

the specified parts

to

trouble-

shoot the CRT and high tension circuit, and, never try

to

modify the circuit under any circumstance.

Use

of

the parts

other than specified may cause to

rise

the high voltage

which generates

X-ray

from the CRT.

6. Perform check-out after servicing

After servicing,

be

sure to confirm safety by checking

that

all

removed screws, component parts, and wirings

were replaced

as

before and

see

that no damage has been

done to the serviced area. Besides, ensure insulation

of

the

input signal terminal against metal portion and plug edges.

• FRONT VIEW

•

REAR VIEW

1. NAME OF FUNCTIONAL COMPONENTS

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3

POWER SWITCH

POWER

LAMP

MODE

LLABEL

~VI

DEOINPUT

A C

INLET

CONTRAST
V-HOLD

BRIGHT
H-HOLD

--

MOOEL LABEL

2.

HOW

TO REMOVE MAJOR COMPONENTS

Four

screws

that

hold

rear panel

Fig. 2

Fig. 3

4

• Removing

the

front panel

*Be

sure to pull out the

AC

cord before the job.

(l)

Remove four screws

that

hold the rear panel.

(2)

Move

away the rear panel to remove it.

• How

to

remove

Main

Board

Pull the

Main

Board toward.

3. ADJUSTMENTS

* Adjustments need conection

of

the

microcomputer.

* Although adjustments had been done to the best condi-

tions before the machine left the factory, follow the

•

+8

power suply circuit adjustment

(1)

Make

sure that the

AC

supply is within a range

of

rocal voltage

±5%.

(2) Adjust the 11.5V adjusting potentiometer so that the

DC

voltage becomes 11.5V between the emitter

of

Q701 and GND.

• Horizontal synchronization adjustment
(I)

Control the microcomputer so that

all

of

data display

periods should become white (horizontal

36.088tLs,

vertical 12.81Ims).

(2) Manipulate the horizontal synchronization adjusting

coil so that the image should appear on the center.

(3) Repeat power on and

off

for several times and check

that no image blur occurs.

• Horizontal amplitude adjustment

(1) Control the microcomputer so that

all

of

data display

periods should become white (horizontal

36.088tLs,

vertical12.811ms).

(2) Manipulate the core

of

the horizontal amplitude

adjusting coil so that the amplitude

at

the center

of

the

screen should become 213mm.

NOTE: Clockwise

turn

of

the horizontal amplitude adjust-

ing coil core makes amplifiation wider.

5

procedures described next, in case there

is

a need

of

adjus

ment due

to

shift in adjustment or after parts replacemen

• Vertical amplitude adjustment

(1) Control the microcomputer so that

all

of

data disph

periods should become white (horizontal

36.08&,.

vertical 12.81lms).

(2) Manipulate the vertical amplitude adjusuting potenti

meter so that the amplitude

of

the image

at

the cent

should become

160mm.

•

Focus adjustment

(1) Operate the microcomputer

to

generate charactel

(2) Manipulate the focus adjusting potentiometer

that an optimum

of

focus should be obtained.

• Sub-brightness adjustment

(1) Operate the microcomputer to generate characte]

(2)

Make

it

adjusted so that no raster should be visit

even

if

the brightness volume is set to its

maximUl

• Vertical linearity adjustment
(1)

Operate the microcomputer

to

gener1rte

characte

(2) Manipulate the vertical linearity potentiometer

that the vertical linearity should set

to

the best.

Circuits

to

be

checked

• PQwer supply circuit

• Horizontal circuit

Circuits

to

be checked

1. Raster

not

visible

• Power supply circuit

• Horizontal circuit

4.

TROUBLESHOOTING

POWER

IS

NOT

SUPPLIED

Is

there

16V

between

0701

collector

and

ground?

0701,0702,0703,

Z0701,

C707,

R705, R702, R703,
0601,0602,0603,L601,0605,OY,L602,L603,0611,C616
R638,

R639

RASTER

NOT

VISIBLE

2. High voltage

is

on,

but

no raster

Is

there

11.5V

between

0701

emitter

and

ground?

• Video

output

circuit

• Horizontal circuit

3.

No high voltage supply

• High voltage circuit

Check voltage level of

CRT

and

Gl.

Voltage

should

change between

-20

to

+15V

when

the

brightness

control

is

manipulated, if

it

is

normal.

F701

F702
0701
0702
0703
0704
T701
L701

Check

connection

of

all connectors

residing

between

monitor

and

computer.

CRT
D608,C630
T602

Brightness

control

potentiometer

R617,

R607,

R619

6

0607,
C617