OPERATION SEQUENCE
OFF CONDIITION
Closing the door activates all door interlock switches
(Right latch switch. Left 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 (240V
50Hz). 24Ovolts A.C. is supplied to the point A7+A9 in the
control unit.
Figure O-t on page 39
1 . The display flashes “88:88”.
2. To set any programmes or set the clock, you must first
touch the STOP/CLEAR key.
3. ” :
” 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 star: the oven with touching START key.
Function sequence Figure O-2 on page 39
CONNECTED COMPONENT SRELAY
&ei: lamp. Turntable motor iPower transformer-i
RY:
3vei
iraxformer R\i’2
-_- .---
Far, --qg:fJ:
RY6
A
La:, volis F.C. is sdppl~ed :o rI-~e primary windli7o oi the
3 ,-, I*‘,’ G !I
l .-
- _
_ a-7sio:mer
‘rie at:agc is c0nver~e.d ?c aGout 3.3
-.,irC I r>
” ..*‘*I_ ---c L‘
,3J;piJ: 33
Lb r’c
t$ie mament wrndlng and high voltage
,L
SJ
~~~~~~~ imafeiif Xlr)“-
-, ^LLL
volts A.C on the sec’3nclar:*t wind-
-, 2
.L
->e i‘lI2~ifr,: iJ~;!~~fi’,g vG!tage
;Z.fq volts; heals the i’;a~x-
*v-.-f f;iar,er,t and
Ihe nic~k voI:aoe (2NcI volts: 1s se;? to
%‘, voltaoe doubiina circui?. wh&e it is doubled to nega-
xw :.oltaie oi appr&maiety 0OG volts 2.C..
P
2
y-h;
u Z&;! MI+Z microwave energy produced in the mag-
re?ro!r, generap =(
“L u
wave length of 12.24 cm. This energy
.r
I- - 9,anneled through the waveguide (transport channel\
inI0 the oven cavity.
where tile food is placed ?o be
,zooked.
4. lrdhen the cooking time is up. a srgnai tone is heard and
the relays (RY! +RY2+RY6) go back to their home posi-
tion. The circuits to the oven lamp. power transformer. fan
motor and turntable motor are cut off.
5. When the door is opened during a cook cycle. the
switches come to the following condition.
Condition
During
Oven Door
Switch
Contact Cooking
Open( No cooking j
Righ Latch Switch
COM-NO
Closed
Open
Monrtor Switch
COM-NC
Open Closed
Left Latch Switch
COM-NO Closed
Stop Switch
Open
OM-NO
Ciosed
3pen
6
The circuits to the power transformer and turntable
motor are cut off when the right latch switch and left
latch switch are made open. The fan motor is cut off
when the stop switch is 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 (RYl) 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 right
latch switch and left latch switch.
6-1
6-2.
6-3.
When the oven door is opened during or after the
cycle of a cooking program, the contacts (COM-
NC) of the monitor switch must be closed and the
contacts (COM-NO) of the righ latch switch, left
latch switch and stop switch must be opened at
the same time.
When the oven door is closed. the contacts (COM-
NC) of the monitor switch must be opened and
the contacts (COM-NO) of the righ latch switch,
ieft latch switch and stopswitch must be closed at
the same time.
When the oven door is opened and the contacts of
the right latch switch and the left latch switch
remain closed. the fuse M8A will blow, because
t9e monitor switch and relay (RYl) are closed and
a short cirsu~l is caused.
MEDIUM HIGH. MEDNM, MEDIUM LOW. LOW
COOKING
V~hen the microwave oven is preset for variable cook-
izg power, 240 volts AC Dower is supplied to the
pOWe 7 rransformer intermittently within a 32-second
trme tjase throuab the relay contact which is coupled
with :ne current-limlt/ng relay RY2. The foliowrng levels
oi microwave poiver are given.
32sec ON
-;r -
21 E 3 -’ hi4 r: s I-
18sec ON
14 set OFF
I.1 E 3 u hl
J] Armor 50%
i2sec ON
2Gsec OFE
VEDIdY -0w
Dy Apvoj 30%
6 set ON
,OVi
l -1 Approh 10%
NOTEThe ON/OFF time ratio does not exactly corre-
spond to the percentage of microwave power,
because approx. 2 seconds are needed for
heating up the magnetron filament.
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