Electrolux EI30BM55HB - 30" Microwave Oven, Техническое и сервисное руководство

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Operation
2-7
HOOD FAN MOTOR
The hood fan motor is a three-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. The automatically operation is medi-
um speed. The manual operation is a three speed
(Low/ Mid/ High).
THERMOSTAT (60°C ON)
This thermostat is 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 thermo-
stat to rise to 140°F (60°C) or higher, thus removing
this hot air from around microwave oven. When the
temperature around the thermostat drops to 113°F
(45°C) or lower, the thermostat shuts off the
hood fan motor.
THERMOSTAT (70°C OFF)
This thermostat is located on the right base plate. It is
designed to automatically cut off power to the hood
fan low speed terminal whenever the hot air
rising from the conventional range below causes the
temperature at the thermostat to rise to 158°F (70°C)
or higher, thus removing this hot air from around
microwave oven. When the temperature around the
thermostat drops to 131°F (55°C) or lower, the
thermostat supplies power to the hood fan low speed
terminal.
STIRRER MOTOR
The stirrer motors drive the stirrer fans to stir the
microwave radiation from the waveguide.
COOK TOP LAMP
The cook top lamp is mounted at the lamp mounting
angle on the base cover. Touch the Light pad once for
high, twice for medium, three times for low and four
times to turn off the light.
Touch Control Panel Operation
The touch control section consists of the following
units as shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit
(3) Power Unit
The principal functions of these units and the signals
communicated among them are explained below.
Keyboard Unit
The keyboard unit is composed of a matrix, signals
generated in the LSI are sent to the keyboard unit.
When a key pad is touched, a signal is completed
through the keyboard unit and passed back to the LSI
to perform the function that was requested.
1) IC4 - This is the IC to judge the selected key.
Control Unit and Power Unit
Control unit consists of LSI, IC, reset circuit, indicator
circuit, power source circuit, relay circuit, buzzer
circuit, synchronizing signal circuit, keyboard unit
circuit and humidity sensor circuit.
1) IC1 (LSI)
This is a microcomputer, responsible for
controlling the entire control unit.
2) IC2
This is the IC to amplify the signal from the
humidity sensor.
3) IC3
This is the IC to drive the Fluorescent Display
(VFD).
4) Reset Circuit
This circuit generates a signal which resets the
LSI (IC1) to the initial state when power is
supplied.
5) Indicator Circuit
Indicator element is Fluorescent Display.
Basically, a Fluorescent Display is triode having a
cathode, a grid and an anode. Usually, the
cathode of a Fluorescent Display is directly
heated and the filament serves as cathode. The
Fluorescent Display has 8-digits, 16-segments
are used for displaying figures.