Electrolux FGMO205KBA, Service Manual

Page: 16 / 48

Section 2 Operation
2-4
DOOR OPEN MECHANISM
The door is opened by pulling the door handle, refer to
the Figure 2-3.
DOOR SENSING AND PRIMARY INTERLOCK
SWITCH
The primary interlock switch is mounted in the lower
position of the latch hook and the door sensing switch
in the secondary 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 power to all high voltage
components. A cook cycle cannot take place until the
door is firmly closed thereby activating both interlock
switches. The secondary interlock system consists 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 secondary interlock relay (RY2) and primary interlock
switch fail to open when the door is opened.
Continued on next page.
Figure 2-3. Door Open Mechanism
Component Descriptions
Door Sensing
Switch
Monitor Switch
Switch Lever
Primary Interlock
Switch
Latch Heads
Door
COOKING SEQUENCE
1. Operate the oven in sensor cooking mode by
referring to the operation manual.
2. The coil of shut-off relays (RY1 and RY3) are
energized, the oven lamp, turntable motor and
cooling fan motor are turned on, but the power
transformer is not turned on.
3. After about 32 seconds, the relay (RY2) is energized.
The power transformer is turned on, microwave
energy is produced and first stage is started.
The 32 seconds is the cooling time required to
remove any vapor from the oven cavity and sensor.
4. When the sensor detects the vapor emitted from
the food, the display switches over to the remaining
cooking time and the timer counts down to zero.
At this time, the door may be opened to stir food,
turn it or season, etc.
5. When the timer reaches zero, an audible signal
sounds. The shutoff relay (RY1 and RY3) and relay
(RY2) are generalized and the power transformer,
oven lamp, etc. are turned off.
6. Opening the door or touching the STOP CLEAR pad,
the time of day will reappear on the display and the
oven will revert to an OFF condition.
The oven should not be operated on Sensor Cooking
immediately after plugging in the unit. Wait two
minutes before cooking on Sensor Cooking.
NOTE
During this first stage, do not open the door or touch
Clear/Off pad.
NOTE