Sharp Carousel R-1601 Manuel d'entretien - Page 12

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R-1600

R-1601

R-1602

DOOR OPEN MECHANISM

The door is opened by pulling the door handle, refer to the

Figure D-1.

Door

Figure D-1. Door Open Mechanism

DOOR SENSING AND SECONDARY INTERLOCK

SWITCHES

The secondary interlock switch is mounted in the lower

position of the latch hook and the door sensing switch in the

primary interlock system is mounted in the upper position 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. A cook cycle cannot take place

until the door is firmly closed thereby activating both inter-

lock switches. The primary interlock system consists of the

door sensing switch and primary 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

blowing the monitor fuse when the contacts of the primary

interlock relay (RY2) and secondary 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 relay (RY2) and

secondary interlock switch are in the OFF condition

(contacts open) due to their being normally open contact

switches. And the contacts of relay (RY1) are in the ON

condition (contacts close).

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

contacts are first opened and then the door sensing

switch and the secondary interlock switch contacts close.

(On opening the door, each of these switches operate

inversely.)

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

(RY2) and secondary interlock switch contacts fail to

open, the monitor fuse blows simultaneously with closing

of the monitor switch contacts.

DESCRIPTION AND FUNCTION OF COMPONENTS

Latch

Hook

Latch

Heads

Door

Sensing

Switch

Monitor

Fuse

Monitor

Switch

Secondary

Interlock

Switch

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE TEST THE DOOR SENSING SWITCH,

PRIMARY INTERLOCK RELAY (RY2), SEC-

ONDARY INTERLOCK SWITCH AND MONI-

TOR SWITCH FOR PROPER OPERATION.

(REFER TO CHAPTER "TEST PROCEDURE").

NOTE: MONITOR FUSE AND SWITCH ARE REPLACED

AS AN ASSEMBLY

TEMPERATURE FUSE (MG)

The temperature fuse located near the waveguide

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 temperature fuse remains

closed. However, the temperature fuse will open at 302˚F

(150˚C) causing the oven to shut down.

THERMAL CUT-OUT (HOOD )

This thermal cut-out located on the right base plate. It is

designed to automatically turn on the hood fan motor

whenever the hot air rising from the conventional range

below causes the temperature at the thermal cut-out to rise

to 140˚F (60˚C) or higher, thus removing this hot air from

around microwave oven. When the temperature around the

thermal cut-out drops to 113˚F (45˚C) or lower, the thermal

cut-out shuts off the hood fan motor.

THERMAL CUT-OUT (CAVITY )

This thermal cut-out is located on the top of the oven cavity.

It is designed to prevent damage to the oven unit if the food

in the oven catches fire due to overheating produced by

improper setting of cooking time or failure of control unit.

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

However, the thermal cut-out will open at 293˚F (145˚C)

causing the oven to shut down.

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. Turntable will turn in either

direction. The turntable motor can be turned off by touching

TURNTABLE ON/OFF pad.

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

vapors given off from the heating foods. It is then exhausted

through the exhausting air vents at the oven cavity.

HOOD FAN MOTOR

The hood fan motor is a two-speed, single-phase, double

pole induction type, requiring a hood fan capacitor. It is

located outside the upper rear part of the oven cavity, is to

remove, from around the oven, hot air rising from the

conventional electric or gas range over which it is installed.