Viking Designer DMOR200SS, Руководство по обслуживанию

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DMOR200SS
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
The door is opened by pulling the door handle, refer to the
Figure D-1.
simultaneously with closing of the monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY (RY2), SEC-
ONDARY INTERLOCK SWITCH, THIRD DOOR
SWITCH AND MONITOR SWITCH FOR
PROPER OPERATION. (REFER TO CHAP-
TER "TEST PROCEDURE").
NOTE: MONITOR FUSE, MONITOR SWITCH AND
SECONDARY INTERLOCK SWITCH ARE
REPLACED AS AN ASSEMBLY
TEMPERATURE FUSE (MG)
The temperature fuse located near the waveguide 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
O F
(150 O 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
O F (60 O C) or higher, thus removing this hot air from
around microwave oven. When the temperature around the
thermal cut-out drops to 113
O F (45 O 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
O
F
(145
O
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
Figure D-1. Door Open Mechanism
DOOR SENSING SWITCH, SECONDARY INTER-
LOCK SWITCHE AND THIRD DOOR SWITCH
The secondary interlock switch is mounted in the lower
position of the latch hook, the door sensing switch in the
primary interlock system is mounted in the upper position
of the latch hook and the third door switch is mounted on
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 interlock 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 and
third door 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),
secondary interlock switch and third door 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 and third door
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 and third door
contacts fail to open, the monitor fuse blows
Door Sensing
Switch
Monitor Switch
Switch Lever
Secondary
Switch
Latch Heads
Door
Third door
Switch