Electrolux EMC4090X, Руководство по обслуживанию

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JOG CONTROL PANEL ASSEMBLY
OUTLINE OF JOG CONTROL PANEL
The jog control section consists of the following units:
(1) Key Unit
(2) Control Unit (The Control unit consists of Power
unit and CPU unit.)
The principal functions of these units and signals
communicated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated
in the LSI are sent to the key unit from P14, P15, P16
and P17.
When a key pad is touched, a signal is completed
through the key unit and passed back to the LSI through
P70, P71, P72 and P73 to perform the function that was
requested.
Control Unit
Control unit consists of LSI, power source circuit,
synchronizing signal circuit, ACL circuit, buzzer circuit,
relay circuit, temperature measurement circuit, indicator
circuit, absolute humidity sensor circuit and back light
circuit.
1) LSI
This LSI controls the temperature measurement
signal, absolute humidity sensor signal, key strobe
signal, relay driving signal for oven function and
indicator
signal.
2) Power Source Circuit
This circuit generates voltage necessary in the
control
unit.
Symbol Voltage Application
VC -5.2V LSI(IC1)
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.
4) ACL
A circuit to generate a signal which resets the LSI to
the initial state when power is supplied.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to
emit audible sounds (key touch sound and
completion
sound).
6) Door Sensing Switch (Stop Switch)
A switch to "tell" the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, grill heating element,
convection heating element, convection motor, fan
motor, turntable motor, damper motor, touch control
transformer and light the oven lamp.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD10 - LD19).
9) Indicator Circuit
This circuit consists 40-segments and 16-common
electrodes using a Liquid Crystal Display.
The Liquid Crystal Display (LCD) is drived by LCD
driver
IC3.
10) Temperature Measurement Circuit : (OVEN
THERMISTOR)
The temperature in the oven cavity is sensed by the
thermistor. The variation of resistance according to
sensed temperature is detected by the temperature
measurement circuit and the result applied to LSI.
The LSI uses this information to control the relay
and display units.
11) Damper Switch
A switch to tell the LSI if the damper is open or
close.