Sharp Carousel II R-3A54 Руководство по эксплуатации - Страница 11

Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Микроволновая печь Sharp Carousel II R-3A54. Sharp Carousel II R-3A54 36 страниц. Microwave oven
Также для Sharp Carousel II R-3A54: Руководство по эксплуатации (27 страниц)

Печатать страницу

R -3A54

I?-3E54

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT

TEST

MAGNETRON

TEST

' NEVER TOUCH

ANY PART IN THE CIRCUIT

WITH YOUR HAND OR AN INSULATED

TOOL WHILE THE OVEN IS IN OPERATION.

____--

-----_____-_..

__ _____ _ _

CARRY OUT 3D CHECKS

Isolate the magnetron

from the high voltage circuit by removing

all leads connected

to the filament

terminal.

To test for an open

circuit

filament

use an ohmmeter

to make a continuity

test between

the

magnetron

filament

terminals,

the meter should

show a reading of less than 1 ohm.

To test for a short circuit

filament

to anode condition,

connect

ohmmeter

between

one of the fil-

ament terminals

and the case of the magnetron

(ground).

This test should

be indicated

an infinite

resistance.

If a low or zero resistance

reading is obtained

then the magnetron

should

be re laced.

(R g

82AOl

MICROWAVE

OUTPUT POWER (2 LITRE WATER LOAD)

The following

test procedure

should

be carried out with the microwave

oven in a fully assembled

condition

(with

outer case fitted).

Microwave

output

power from the magnetron

can be measured

by way of substitution,

i.e. it can be measured by using a water load how much it can be absorbed

by the water load.

To measure the microwave

output

power in the microwave

oven, the relation

of calorie and watt is used.

On the other hand, if the temperature

of the water with

V(ml)

rises

AT ("C) during

this microwave

heating

period, the calorie of the water is V x AT.

The formula

is as follows;

8330

x AT

Our condition

for the water load is as follows:

Room temperature

. . . . ..*..................... 23 + 2°C

Power supply Voltage . . . . . . . . . . . . . Rated voltage

Water load . . . ...2000

Initial

temperature

. . . . ...23&1 "C

Heating time . . . . . . . . 2min. 8 sec. j

P=65xAT

Measuring

method:

A) Use two 1 litre Pyrex beakers with a diameter of approximately

of 12cms.

B) Place 1 litre of 10°C water in each beaker.

C) Mark Tl on the one beaker and mark T2 on the other one. And stir the water and measure the

temperature

of water the thermometer

and note them. The graduation

of the thermometer

must

be scaled by 0.1 "C at minimum

and an accurate

mercury thermometer

is recommended.

D) Place the two beakers as touching

each other in the centre of the cavity.

E) Set the timer to 2minute

and 8 seconds

at 100% power

(the time required

to raise the water

temperature

10 degrees C.)

F) The time must be measured with stopwatch

or wristwatch.

G) After 2minute

and 8 seconds stop the oven by opening

the door.

H) Remove the two beakers from the oven and measure the temperature

of the water by stiring the

water with the thermometer

and noting

the readings.

Example

Initial temperature

= 10°C

T2 =

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

11 "C

Temperature

after 2min. 8 sec. ..........................................................

Tl = 20°C

T2 = 21 "C

Temperature

difference

Cold-Warm

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

AT1

= 10°C

AT2

= 10°C

Mean temperature

rise AT

........ AT

= (AT1

+AT2)

/ 2 - (IOOC + IO'C)

/ 2 = 10°C

Measured

output

power

The equation

is "P= 65 x AT"

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

P= 65 x 10°C = 650 Watts

NOTE:

The

measured

output

power

should

be at least

+I5

% of the

rated

output

power.