Sharp Carousel R-312AK Servicehandleiding - Pagina 10

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R-312AW

R-312AK

DOOR OPEN MECHANISM

The door is opened by pushing the open button on the

control panel, refer to the Figure D-1.

When the open button is pushed, the open button pushes up

the switch lever, and then the switch lever pushes up the the

latch head. The latch heads are moved upward and re-

leased from latch hook. Now the door will open.

LATCH HOOK

LATCH

HEADS

SWITCH

LEVER

Figure D-1. Door Open Mechanism

DOOR SENSING, THIRD DOOR AND PRIMARY

INTERLOCK SWITCHES

The primary interlock switch is mounted in the lower position

of the latch hook and the door sensing switch in the

secondary interlock system is mounted in the upper position

of the latch hook. The third door switch is mounted in the

lower position at the back of the latch hook. They are

activated by the latch heads on the door. When the door is

opened, the switches interrupt the circuit to all components

except the oven lamp and the noise filter. A cook cycle

cannot take place until the door is firmly closed thereby

activating both interlock switches. The secondary interlock

system consists of the door sensing switch and secondary

interlock relay located on the control circuit board.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the

latch head on the door while the door is closed. The switch

is intended to render the oven inoperative by means of

blowning the monitor fuse when the contacts of the primary

interlock switch fail to open when the door is opened.

Functions:

1. When the door is opened, the monitor switch contact

close (to the ON condition) due to their being normally

closed. At this time the primary interlock switch is in the

OFF condition (contacts open) due to its being normally

open contact switches.

2. As the door goes to a closed position, the monitor switch

contacts are first opened and then the door sensing

DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR SENSING

SWITCH

MONITOR

SWITCH

THIRD DOOR

SWITCH

PRIMARY INTERLOCK

SWITCH

switch, the primary interlock switch and third door switch

contacts close. (On opening the door, each of these

switches operate inversely.)

3. If the door is opened, and primary interlock switch

contacts fail to open, the monitor fuse blows

simultaneously with closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE TEST THE PRIMARY INTERLOCK

SWITCH AND MONITOR SWITCH FOR

PROPER OPERATION. (REFER TO CHAP-

TER "TEST PROCEDURE").

NOTE: MONITOR FUSE AND SWITCH ARE REPLACED

AS AN ASSEMBLY

TURNTABLE MOTOR

The turntable motor rotates the turntable located on the

bottom of the oven cavity, so that the foods on the turntable

cook evenly during cooking. The turntable may turn in either

direction.

COOLING FAN MOTOR

The cooling fan motor drives a blade which draws external

cool air. This cool air is directed through the air vanes

surrounding the magnetron and cools the magnetron. This

air is channelled through the oven cavity to remove steam

and vapours given off from the heating foods. It is then

exhausted through the exhausting air vents at the oven

cavity.

OVEN THERMAL CUT-OUT

The thermal cut-out, located on the top of the oven cavity, is

designed to prevent damage to the oven by fire. If the foods

load is overcooked, by either error in cook time or defect in

the control unit, the thermal cut-out will open.

Under normal operation, the oven thermal cut-out remains

closed. However, when abnormally high temperatures are

reached within the oven cavity, the oven thermal cut-out will

open at 257˚F(125˚C), causing the oven to shut down.

MAGNETRON THERMAL CUT-OUT

The thermal cut-out located near the magnetron is designed

to prevent damage to the magnetron if an over heated

condition develops in the tube due to cooling fan failure,

obstructed air guide, dirty or blocked air intake, etc.

Under normal operation, the thermal cut-out remains closed.

However, when abnormally high temperatures are reached

within the magnetron, the thermal cut-out will open at

203˚F(95˚C) causing the oven to shut down, when the

magnetron has cooled to 167˚F (75˚C), the thermal cut-out

closes and cook cycle will resume.

NOISE FILTER

The noise filter prevents the redio frequency interference

that might flow back in the power circuit.