Electrolux MCC4060E Service Manual page 12

The circuit to the turntable motor is cut off when the contacts (COM-NO) of the monitored latch switch SW1 are
made open. The oven lamp remains on even if the oven door is opened after the cooking cycle has been
interrupted, because the relay RY1 stays closed. Shown in the display is the remaining time.
6. MONITOR SWITCH CIRCUIT
The monitor switch SW3 is mechanically controlled by oven door, and monitors the operation of the
monitored latch switch SW1.
6-1 When the oven door is opened during or after the cycle of a cooking program, the monitored latch switch SW1,
and stop switch SW2 must open their contacts (COM-NO) first. And the contacts (COM-NC) of the monitored
latch switch SW1 are made closed. After that the contacts (COM - NC) of the monitor switch SW3 can be
closed and the contacts (COM-NO) of monitor switch SW3 are made open.
6-2 When the oven door is closed, the contacts (COM - NC) of the monitor switch SW3 must be
opened and the contacts (COM - NO) of monitor switch SW3 must be closed. After that the contacts
(COM - NO) of the monitored latch switch SW1 and stop switch SW2 are made closed. And the contacts
(COM - NC) of the monitored latch switch SW1 are made open .
6-3 When the oven door is opened and the contacts (COM - NO) of the monitored latch switch SW1 remain
closed, the fuse F2 F8A will blow. Because the relay RY1 and monitor switch SW3 are closed and a short
circuit is caused.
HIGH, MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW COOKING
When the microwave oven is preset for variable cooking power, the line voltage is supplied to the high voltage
transformer intermittently within a 32-second time base through the relay contact which is coupled with the current-
limiting relay RY2 . The following levels of microwave power are given.
100% (HIGH)
70% (MEDIUM HIGH)
50% (MEDIUM)
30% (MEDIUM LOW)
10% (LOW)
NOTE: The ON/OFF time ratio does not exactly correspond to the percentage of microwave power, because
approx. 3 seconds are needed for heating up the magnetron filament.
GRILL COOKING CONDITION
TOP GRILL (Figure O-3a)
In this condition the food is cooked by grill heating element energy. Programme the desired cooking time by turing
the "TIME/WEIGHT" knob and the select knob to "GRILL". When the "START" button is pressed, the following
operations occur:
1. The numbers on the digital read-out start the count down to zero.
2. The oven lamp, cooling fan motor and turntable motor are energized.
3. The relay RY3 is energized and the main supply voltage is applied to the top grill heatig elements.
4. Now the food is cooked by the top grill heating elements.
NOTE: The grill cooking condition will be carried out continuously until the temperature of the oven cavity rise
to 220°C.
CONVECTION COOKING CONDITION (Figure O-4)
PRE-HEATING (by 40°C - 130°C)
Turn select knob to CONVECTION.
Programme the desired convection temperature of 40°C - 130°C by pressing the CONVECTION button. When the
START button is pressed, the following operations occur:
1. The relays RY1, RY6 and RY7 are energized, the oven lamp, turntable motor, fan motor and convection motor
are turned on.
2. The relay RY4 is energized and the main supply voltage is applied to the convection heating element.
3. After the temperature of oven cavity rises to the selected one, the oven will continue to turn the convection
heating element on and off to maintain the temperature for 30 minutes.
SOI 12.06 FV
OPERATION SEQUENCE
32 sec. ON
24 sec. ON
18 sec. ON
12 sec. ON
6 sec. ON
12/43
100%
Approx. 70%
Approx. 50%
Approx. 30%
Approx. 10%
599 37 42-75