I?-3A53
R-3A530
OPERATING SEQUENCE
OFF CONDITION
3.
Closing the door activates all door interlock switches
(1 st latch switch, 2nd latch switch and stop switch).
IMPORTANT
When the oven door is closed, the monitor switch
contacts (COM -
NC) must be open.
When the microwave oven is plugged in a wall outlet.
Rated voltage (240 Volts : Australia, 230- 240 Volts :
New Zealand) is supplied to the point Al + A3 in the
control unit.
4
5
1.
2.
3.
Figure O-l on page 33 (For Australian)
Figure O-3 on page 34 (For Ney Zealand)
The display flashes “88:88”.
To set any programmes or set the clock, you must
first touch the STOP/CLEAR key.
91 .
.
” appears in the display and the time counts
up every minute.
NOTE: When the oven door is opened, the oven
lamp comes on at this time.
MICROWAVE COOKING CONDITION
HIGH COOKING
Enter a desired cooking time with the touching
NUMBER key and start the oven with touching
START key.
Function sequence
Figure O-2 on page 33 (For Australian)
Figure O-4 on page 34 (For New Zealand)
CONNECTED COMPONENTS
RELAY
Oven lamp, Fan motor, Turntable motor
--
Power transformer
RYI
RY2 -
1. Rated voltage is supplied to the primary winding of
the power transformer. The voltage is converted to
about 3.3 volts A.C. output on the filament winding
and high voltage of approximately 2000 volts A.C.
on the secondary winding.
2. The filament winding voltage (3.3 volts) heats the
magnetron filament and the high voltage (2000
volts) is sent to the voltage doubling circuit, where
it is doubled to negative voltage of approximately
4000 volts D.C..
6.
The 2450 MHz microwave energy produced in the
magnetron generates a wave length of 12.24 cm.
This energy is channeled through the waveguide
(transport channel) into the oven cavity, where the
food is placed to be cooked.
When the cooking time is up, a signal tone is heard
and the relays RYI + RY2 go back to their home
position.
The circuits to the oven lamp, power
transformer, fan motor and turntable motor are cut
off.
When the door is opened during a cook cycle, the
switches come to the following condition.
CONDITION
DURING
DOOR OPEN
SWITCH
CONTACT
COOKING (NO COOKING)
1st latch switch
COM- NO
Closed
Open
Monitor switch
COM- NC
Open Closed
2nd latch switch
COM - NO
Closed Open
Stop switch
COM- NO Closed Open
The circuits to the power transformer, fan motor and
turntable motor are cut off when the 1st latch
switch, 2nd latch switch and stop switch are made
open.
The oven lamp remains on even if the oven door is
opened after the cooking cycle has been inter-
rupted, because the relay RYI stays closed. Shown
in the display is the remaining time.
MONITOR SWITCH CIRCUIT
The monitor switch is mechanically controlled by
oven door, and monitors the operation of the 1 st
and 2nd latch switches.
6-1
When the oven door is opened during or after the
cycle of a cooking program, the 1 st latch and 2nd
latch switches must open their contacts first. Af-
ter that the contacts (COM - NC) of the monitor
switch can be closed and then contacts of the
stop switch can be opened.
6-2. When the oven door is closed, the contacts
(COM - NC) of the monitor switch must be
opened and the contacts (COM - NO) of the stop
switch must be closed first. After that the con-
tacts of the 1st latch switch and 2nd latch
switches are closed.
6-3. When the oven door is opened and the contacts
of the 1st and 2nd latch switches remain closed.
The fuse M6.3A will blow, because the monitor
switch is closed and a short circuit is caused.
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