Acer R-1200 Wartungshandbuch PDF herunterladen (Seite 10)

R-1200

R-1201

DESCRIPTION AND FUNCTION OF COMPONENTS

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

(RY2) 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 DOOR SENSING SWITCH,

SECONDARY INTERLOCK RELAY (RY2),

RELAY (RY1), 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

TEMPERATURE FUSE (MG)

The temperature fuse located on the fan duct assembly 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 temperature fuse remains

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

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

NOTE: This is a fuse. It does not reset.

TEMPERATURE FUSE (CAVITY )

This temperature fuse 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 pro-

duced by improper setting of cooking time or failure of

control unit.

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. The defective

temperature fuse must be replaced with a new one.

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 LAMP

The hood lamps are mounted at the hood lamp angle on

the base cover. The hood lamps can be turned off and on

by touching the ACCENT LIGHT pad or TASK LIGHT pad.

And also the brightness can be varied to high or low by

touching the ACCENT LIGHT pad or TASK LIGHT pad.

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 open lever, and then the open lever pushes up the latch

head. The latch heads are moved upward and released

from latch hook. Now the door will open.

Figure D-1. Door Open Mechanism

DOOR SENSING AND PRIMARY INTERLOCK

SWITCHES

The primary interlock switch is mounted in the lower posi-

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

secondary interlock system is mounted in the upper posi-

tion of the latch hook. They are activated by the latch heads

on the door. When the door is opened, the switches inter-

rupt the circuit to all components. A cook cycle cannot take

place until the door is firmly closed thereby activating both

interlock switches. The secondary interlock system con-

sists 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

blowing the monitor fuse when the contacts of the second-

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

and primary 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 primary interlock switch contacts close.

(On opening the door, each of these switches operate

inversely.)

Latch hook

Door sensing

switch

Latch heads

Monitor switch

Primary interlock switch

Open lever

Door

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