Frigidaire CFMV152KW, Руководство по обслуживанию

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Section 2 Operation
2-4
Touch Control Panel Assembly Outline
The touch control section consists of the following units.
(1) Key unit
(2) Control Unit: The Control unit consists of LSI Unit and
Power Unit.
The principal functions of these units and the 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 through P20, P21, P22,
P25, and P26. When a key pad is touched, a signal is
completed through the key unit and passed back to the
LSI through P43, P44, P45 and P46 to perform the
function that was requested.
CONTROL UNIT
Control unit consists of LSI, power source circuit,
synchronizing signal circuit, reset circuit, buzzer circuit,
relay circuit indicator circuit and back light circuit.
1. (LSI)
This LSI controls the key strobe signal, relay driving
signal for oven function and indicator signal.
2. Power Source Circuit
This circuit generates voltages necessary for the
control unit from the AC line voltage. In addition,
the synchronizing signal is available in order to
compose a basic standard time in the clock circuit.
Symbol Voltage Application
VC -5.3V 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 incorporates a very small error because it
works on commercial frequency.
4. Reset Circuit
This circuit generates a signal which resets the LSI
(IC1) to the initial state when power is supplied.
5. Buzzer Circuit
The buzzer is responds to signals from the LSI to
emit audible sounds (key touch sound and
completion sound).
6. Door Sensing Switch
A switch to inform the LSI if the door is open or
closed.
7. Relay Circuit
To drive the magnetron, fan motor, turntable motor,
hood motor, and light the oven lamp and hood lamp.
8. Indicator Circuit
This circuit consists of 22 segments and 3 common
electrodes using a Light Crystal Display.
9. Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD1-LD4).
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 upper
position of the latch hook, and the door sensing switch in
the primary interlock system is mounted in the lower
position of the latch hook. The switches are activated by
the latch heads on the door. When the door is opened,
the switches interrupt the circuit to all components.
A cook cycle cannot take place until the door is firmly
closed, thereby activating both interlock switches. The
primary interlock system consists of the door sensing
switch and secondary interlock relay located on the
control circuit board.
Figure 2-3. Door Open Mechanism
Component Descriptions
Primary Interlock
Latch Heads
Latch Hook
Monitor Switch
Door Sensing Switch
Door
Switch