R-6280
OPERATION
NORMAL COOKING SEQUENCE
To start cooking:
1.
2
3
4
Place the food to be cooked in the oven and close the door
firmly.
Set the cooking control for a desired position.
Set the timer for a desired cooking time. The oven lamp
will come on immediately.
Push the cook button. The turntable motor will rotate to
indicate the oven is in the cook cycle, and the timer motor
will operate.
5.
Note: If the oven door IS opened during the cook cycle,
the oven will go out of the cook cycle (no microwave
energy) and the timer will stop. This is done so the exact
cooking time remains on the timer. To restore cooking
operation, the door must be closed and the cook button
must be pushed again.
At the end of the cook cycle (time returned to ” 0 “), the
timer bell will ring. The oven will stop supplying the
microwave energy.
DESCRIPTION OF OPERATING SEQUENCE
The following is a complete descrrption of component func-
tions during the three stages of oven operation.
OFF CONDlTiON
With the timer dial at ” 0 ”
position and the door closed, no
components in the oven will operate (Figure O-l). But rhe
oven lamp will come on with the door opened.
IDLE CONDITION
Closing the door activates latch switch. Selecting a cooking
time closes the timer contacts leading to the oven lamp and
latch switch, therefore the oven lamp comes on (Figure O-2).
COOKiNG CONDITION
1. FULL POWER COOKING
When the cooking control set to HIGH position and the
start button is pushed ,with the timer set, the following
operation occurs: (Figure O-3).
l-l. Timer motor, turntable motor and fan motor are
energized.
l-2. The 240 volts A.C. is supplied to a primary winding
of the power transformer through the vari-switch, and
is converts 3.5 volts A.C. output on the filament
winding and approximately 1,900 volts A.C. on the
high voltage winding.
1-3. The filament winding voltage heats the magnetron
filament and H.V winding voltage is sent to voltage
doubler circuit consisting of a high voltage capacitor
and a rectifier.
l-4. The microwave energy produced by the magnetron
tube is channeled into the oven cavity where the food
is placed to be cooked.
1-5. Upon completion of the selected cooking time, the
timer contacg open and the oven reverts to the off
condition.
in the case cook (latch) switch falls with its contacts closed
when the door is opened, the monitor switch wrll form a
short circuit through the fuse and the cook (latch! switch.
2. VARIABLE COOKING
When the cooking control set to MED HIGH, MED, MED
LOW DEFROST, LOW position and the cook button is
pushed, the following operation occurs.
2-l. Above l-l operation occurs.
2-2. The varl-motor rotates at two (2) revolutions per
minute.
In case the cooking control is set to MED
HIGH, the 240 volts A.C. is supplied to the power
transformer intermittently through the vari-switch
which is operated,
at 24 seconds ON and 6
seconds OFF repetrtlon rate by means of a cam
linked to the vari-motor shaft. The repetition rate
for others are as follows:
MED
: 16.5 seconds ON, 13.5 seconds OFF.
FEpR&‘$y : 9 seconds ON, 21 seconds OFF.
LOW :
5 seconds ON, 25 seconds OFF.
2-3. The power transformer converts while the 240 volts
A.C. is supplied to the primary winding.
2-4. Then above 1-3, 1-4, and l-5 operations occur.
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