Function Of Important Components - Electrolux MC1751E Service Manual

FUNCTION OF IMPORTANT COMPONENTS

DOOR OPEN MECHANISM
The door can be opened by pushing the door open button.
MONITORED LATCH SWITCH (SW1)
1. When the oven door is closed, the contacts
(COM - NO) must be closed.
2. When the oven door is opened, the contacts
(COM - NO) must be opened.
MONITOR SWITCH (SW2)
1. When the oven door is closed, the contacts
(COM - NC) must be opened.
2. When the oven door is opened, the contacts
(COM - NC) must be closed.
3. If the oven door is opened and the contacts
(COM - NO) of the monitored latch switch
(SW1) fail to open, fuse F8A blows
simultaneously with closing the contacts
(COM - NC) of the monitor switch (SW2).
STOP SWITCH (SW3)
1. When the oven door is closed, the contacts
(COM - NO)must be closed.
2. When the oven door is opened, the contacts (COM - NO) must be opened.
CAUTION: BEFORE REPLACING A BLOWN FUSE (F1) TEST THE MONITORED LATCH SWITCH
(SW1) AND MONITOR SWITCH (SW2) FOR PROPER OPERATION. (REFER TO
CHAPTER "TEST PROCEDURE".)
FUSE F1
1. The fuse F1 also blows when the H.V. rectifier, H.V. wire harness, H.V. capacitor, magnetron or
secondary winding of power transformer is shorted.
2. If the wire harness or electrical components are short-circuited, the fuse F1 blows to prevent an electric
shock or fire hazard.
THERMAL CUT-OUT 125
The thermal cut-out located on the top of the oven cavity is designed to prevent damage to the oven if the
foods in the oven catch fire due to over heating produced by improper setting of cook time or failure of control
unit. 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
125°C, causing the oven to shut down. The defective thermal cut-out must be replaced with a new one.
THERMAL CUT-OUT 125
This thermal cut-out protects the magnetron against overheat.
If the temperature goes up higher than 125
openings are blocked, the thermal cut-out TC02 will open and line voltage to the high voltage transformer T
will cut off and operation of the magnetron MG will be stopped. The defective thermal cut-out must be
replaced with a new one.
TURNTABLE MOTOR
The turntable motor drives the turntable roller assembly to rotate the turntable.
FAN MOTOR
The 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
flows through the oven cavity to remove steam and vapours given off from the heating foods. It is then vented
through the exhaust air vents at the rear of oven cavity.
NOISE FILTER
The noise filter prevents the radio frequency interference that might flow back in the power circuit.
SOI 01.05 FV
°
C TC01 (OVEN)
°
C TC02 (MG)
°C
because the fan motor is interrupted or the ventilation
Door
Latch heads
Figure D-1. Door Open Mechanism
12/33
Latch hook
SW3: Stop switch
SW2: Monitor switch
SW1: Monitored latch switch
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