14
PCOR30B
PCOR30R
PCOR30S
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
SECONDARY SWITCH, THIRD DOOR SWITCH &
DOOR SENSING SWITCH
The secondary switch and third switch mounted parrallel to
each other horizontally in the upper positions of the latch
hook, the door sensing switch is mounted horizontally in the
upper position of the latch hook. They are activated by the
latch head on the door. When the door is opened, the switches
interrupt the power to all high voltage components, except the
oven lamp . A cook cycle cannot take place until the door is
firmly closed thereby activating all interlock switches. The
secondary interlock system consists of the door sensing
switch and the 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
switch and secondary 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, primary switch
and secondary switch are in the OFF condition (contacts
open) due to their 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 switch,
primary switch and secondary switch contacts close. (On
opening the door, each of these switches operate inversely.)
3. If the door is opened, and the secondary interlock relay,
primary switch and secondary 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 SECONDARY INTERLOCK
RELAY, SECONDARY SWITCH, DOOR SENS-
ING SWITCH, MONITOR SWITCH AND PRI-
MARY SWITCH FOR PROPER OPERATION.
(REFER TO CHAPTER "TEST PROCEDURE").
NOTE: MONITOR FUSE, PRIMARY SWITCH AND
MONITOR SWITCH ARE REPLACED AS AN
ASSEMBLY.
TEMPERATURE FUSE (MG)
The temperature fuse located near the waveguide is de-
signed 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 302½F (150½C)
causing the oven to shut down.
THERMAL CUT-OUT (HOOD )
This thermal cut-out located on the base plate right. 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 140½F (60½C) or higher, thus removing this hot air from
around microwave oven. When the temperature around the
thermal cut-out drops to 113½F (45½C) or lower, the
thermal cut-out shuts off the food fan motor.
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.
This air is then expelled either vertically or horizontally
through the customer supplied duct system, or discharged
back into the kitchen.
DESCRIPTION AND FUNCTION OF COMPONENTS
THIRD
DOOR
SWITCH
DOOR
LATCH HOOK
LATCH
HEADS
DOOR SENSING
SWITCH
MONITOR
SWITCH
SECONDARY
INTERLOCK
SWITCH
OPEN LEVER
MONITOR FUSE
Содержание PCOR30B
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