Sharp mz-800 Instrukcja Obsługi Pobierz pdf (Strona 37)

5-2.

Operational description

The block

diagram

of

the

power

supply

unit

is

shown

above. It

adopts

the

self-excitation ON/ON

control

method. First,

the

source

supply

is rectified

through

the

noise

filter

and

converted

into

direct

current.

As

the

dc

current is

applied

to

the

switching

transistor,

it

causes

the transistor

to

start

repeating ON and

OFF.

After

the

dc

voltage is

converted

into

high

frequency

pulse,

it

is

added

to

the

primary

side

of

the

main

transformer

which causes

to

induce

voltage

on

the

secondary

side.

This high

frequency

pulse

is

then

rectified and

filtered

to

obtain the

dc

voltage

of

+5

volts. For

control

of

output

voltage,

the

output

voltage

is

compared

with

the

refer-

ence voltage and

its

error

is detected in

the

control

section.

While

the

switching

transistor

is in

the

OFF

cycle,

it

makes

the

photo

cuppler

PC1

active

by

the

detecting signal

of

the

control

section

for

given

period.

By

adjusting

control

current

of

the

drive

circuit,

it

makes

the out

put

stabilized.

5-3. Maintenance

Cleaning

Dust deposit inside

the

power

supply

unit

may

becomes

the cause

for

overheat

as

it

prevent

heat

dispersion,

which results in

damage

in

component.

Stains

on

the

fuse contact and

connector

contact

may

lead

to

contact

failure. So, it has

to

be cleaned

using

soft

cloth

dam-

pened

with

alcohol

or

dry

soft

cloth.

5-4. Problem determination and sequence

Follow the

next

procedure

to

find

the

cause

of

trouble.

(1)

Avoid

removing

the

board

to

check.

But

visually

observe

the

board

to

check

for

open

circuit

line,

burnt

resistor, fuse, and

semiconductor

chips

in

the

first place.

(2)

If a defective

item

were

found,

it

has

to

be replaced

with

the

new

one. But. care

must

also taken as

there are

possible

defects in

mUltiple

number

of

components.

36

<tMZ1P16~

1. SPECIFICATION

Outline

MZ-800

The

MZ-1 P16 is

the

external

installation

4-color

plot

printer

designed

for

use

with

the

MZ-800 series person-

al

computer.

It

can be

fixed

on

the

MZ-800

when

the

table

is used.

Specification

Type

name

Print

method

Print speed

Printing size

Character set

Resolution

Power

supply

Power

consumption:

Physical

dimensions:

Weight

Accessories

Operating

MZ1P16

1, Black;

2,

Blue;

3,

Green; 4, Red

10 characters average

(smallest letter)

80/40/26

digits

(software

assigned)

115

0.2

mm

+5

V

supplied

from

the

MZ-800 via

the

DC

jack

11

W

162(W) x 133(D) x

59(H),

excluding

accessories.

1

kg

(MZ-1P16)

Roll

paper

(1), ball

point

pen (one

each

of

black, blue, green, red).

paper

holder

(one each on side),

paper

shaft (1),

paper

guide

(1)

temperaturd

0

to

+35

centigrades

Storage

temperature

-20

to

+70

centigrades

Operating

humidity

80%RH,

maximum

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 70 71

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