Sharp R-330N R Bedienungsanleitung PDF herunterladen (Seite 5)

4.

Trouble shooting procedure of POWER SUPPLY

4-1.

Tools required

The following tools

are

required for

servicing.

4.

5V

11.3A and 12V 11.3A loads

1. Oscilloscope

5.

AC ammeter and

voltmeter

2.

Voltage regulator (Slidac)

3. Voltmeter (digital voltmeter)

4-2.

When R 1

is

open

Since this failure may possibly be due

to

short circuit

of

ac

line capacitor, RC1, C4, or Q1,

the

cause

has

to

be checked

in

accordance with the flowchart below. -

Flowchart

Phenomenon

and

others

Replacing

component

Gl

Set

the

oscilloscope

to

the

follow·

(

Start

ing

range.

Voltage range: 50V/div

~

Time range:

10us/div

Replace

R 1 with the new

one.

®

Shut off

the

AC

supply immedi-

Replace

the

following components

l

Gl

ately, when

the

ammeter coupled with new ones

in

this case, because

Connect the oscilloscope

to

the

AC

line increases abruptly. there may be possible destruction

in

probes

between

the

emit~

these components.

ter and collector

of

Q1.

01,

RC1.C4.Cl,C16

~

®

@

Should

01

be found

in

failure,

there will

be

need

of

replacing

Gradually increase the

the

following components, as

they

AC

voltage using *Slidac.

may possibly be

in

destruction,

too.

~

@

02,03,Dl,D3,Rl1,RS

Replace

the

defective

@

component with

the

new

Put

the

load into connection

in

NOTE:

Should 01

be found

in

fail~

this case and ensure

that

the

ure, there may be possible destruction

one.

following waveform appears.

in

RS,

too.

When

Step

(2)

is

carried

~

@

out

with

RS

in

open state,

it

causes

Gradually

increase the

r-

to

add

dc

voltage between

the

collec-

AC

voltage using *Slidac

h

tor

and

the

emitter

of

01 so

that

DC

and

ensure appearance

of

voltage may not decrease even after

the waveform shown

in

the

ac supply

was

shut

off.

So,

care

FIG·2.

320V

must be exercised

in

this

case

to

~

avoid continuous impression

of

the

DC

Check

proper output

of

voltage.

+5V and

+12V, respec-

tively.

-~

-

J,

1--35"S-

(

End

)

(Fig.

2)

* Slidac = Variable Voltage transformer

-5-

1 2 3 4 5 6 7 8 9 10 ... 15 16

SERVICE 1
Specification 2
'" 3
>-+-+-----1 4
1--35"S 5
',;'; 6
~" 7
I:" 8
========:::::J 9
I-'·W·· 10
!'i 11
' ' 12
='= 12
~iK~:~~; 13
" 14
Exteriors 15
Printed 16

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