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-~
R-9380
OPERATION
DESCRIPTION
OF OPERATING
SEQUENCE
The following
is a description
of component
functions
during
oven operation.
(RD7!101Ul
OFF CONDITION
Closing
the door activates
both
door
latch
switches:
upper
latch
switch
and lower
latch switch.
(In this
condition,
the monitor
switch
contacts
are opened.)
The stop switch
is activated
by the latch head.
When oven is plugged
in, 240 volts A.C. is supplied
to
the control
unit.
But no components
in the oven will
operate.(Figure
o-1 .)
Note: When the door is opened
by pushing
the door
open button,
the contacts
of the relay RY-1 are
closed, then the oven lamp lights.
1.
The display
will show flashing
"88:88".
To set any program
or set the clock,
you must
first touch the STOP/CLEAR
pad.
The display
will
clear, and 1 :00 will
appear and
count
up every minute.
COOKING
CONDITION
'HIGH
COOKING
CONDITION
Program
desired
cooking
time and Variable
Cooking
Control
by touching
the NUMBER
pads and the HIGH
pad of the Variable Cooking
Control.
When the START
pad is touched,
the following
operations
occur:
1. The contacts
of relays are closed
and components
connected
to the relays are turned
on as follows.
(For details, refer to Figure O-2)
2.
3.
4.
5.
RELAY
-Fw1
RY-2
CONNECTED
COMPONENTS
.---.-
oven lampjturntable
motor/fan
motor
power transformer
240 volts A.C. is supplied
to the primary
winding
of the power transformer
and is converted
to about
3.5 volts A.C. output
on the filament
winding,
and
approximately
1900 volts A.C. on the high voltage
winding.
The filament
winding
voltage
heats the magnetron
filament
and the H.V. winding
voltage
is sent to a
voltage
doubler
circuit.
The microwave
energy produced
by the magnetron
is channeled
through
the waveguide
into the cavity
feed-box,
and then into the cavity
where
the food
is placed to be cooked.
Upon
completion
of the cooking
time, the power
transformer,
oven lamp, etc. are turned
off, and the
generation
of microwave
energy
is stopped.
The
oven will revert to the OFF condition.
6. When
the door
is opened
during
a cook
cycle,
monitor
switch,
upper latch switch
and lower latch
switch
are activated
with the following
results.
The
circuits
to the turntable
motor, the cooling
fan mo-
tor, and the high voltage
components
are deener-
gized,
the oven
lamp remains
on, and the digital
readout displays
the time still remaining
in the cook
cycle when the door was opened.
7. The monitor
switch
is electrically
monitoring
the
operation
of the upper latch switch
and is mechan-
ically associated
with .the door so that it will func-
tion in the following
sequence.
(1) When the door opens from a closed
position,
the stop switch,
upper and lower latch switches
first operate
to open their
contacts,
and then
the monitor
switch
contacts
close.
(2) When the door is closed
from the open posi-
tion,
the monitor
switch
contacts
first
open,
and then the contacts
of the stop switch,
upper
and lower latch switches
close.
In case the upper latch switch
fails with
its contacts
closed
when
the door is opened,
the monitor
switch
will
form a short circuit
through
the fuse M6.3A,
and
the upper
latch
switch,
causing
the fuse
M6.3A
to
blow.
MED
HIGH,
MED,
MED
LOW (DEFROST),
LOW,
HOLD
COOKING
When Variable
Cooking
Power
is programed,
the 240
volts
A.C.
is
supplied
to
the
power
transformer
intermittently
through
the
contacts
of
relay( KY-2)
which
is operated
by the control
unit within
a 32 sec-
ond time base.
Microwave
power
operation
is as fol-
lows:
VARI-MODE
ON TIME
HIGH
32 sec.
.__--
OFF TIME
0 sec.
(100% power)
__---_--
~_.-.-
ME0 HIGH
24 sec.
8 sec.
(approx.
70% power)
MED
18 sec.
14 sec.
(approx.
50% power)
_.
~~ .~ -_. ~~.~~-.---
..--.-
_-----.
~- .-~.. -. - --
~~
MED LOW (DEFROST)
12 sec.
20 set
(approx.
30% power)
..Low
6 sec.
26 sec.
(approx.
10% power)
HOLD
0 sec.
32 set
(0% power)
-
___.
Note: The
ON/OFF
time
ratio
does
not
correspond
with
the percentage
of microwave
power,
be-
cause approx.
2 seconds
are needed for heating
of the magnetron
filament.
(RD71401U)
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