R-64ST - 10
GRILL HEATING ELEMENT GH
The grill heating element is provided to brown the food
and is located on the top of the oven cavity.
NOISE FILTER
The noise filter assembly prevents radio frequency inter-
ference that might flow back in the power circuit.
TURNTABLE MOTOR TTM
The turntable motor drives the roller stay to rotate the
turntable.
FAN MOTOR FM
The fan motor drives a blade which draws external cool
air. This cool air is directed through the air vanes sur-
rounding the magnetron and cools the magnetron. This
air is channelled through the oven cavity to remove steam
and vapours given off from the heating foods. It is then
exhausted through the exhausting air vents at the oven
cavity.
EXPRESS COOK programme
Keep on touching the COOK/DEFROST button until the
desired cooking programme appears in the display.
Enter weight or quantity of food by rotating the TIMER/
WEIGHT/POWER knob until the desired weight/quantity
is displayed.
Once the oven starts, it will cook according to the computer
programmed sequence.
COMBI GRILL COOKING CONDITION
Program desired cooking time and select COMBI GRILL
mode and programme microwave power level. When the
START pad is touched, the following operations occur:
1. The numbers of the digital read-out start the count
FUSE F1 250V
1. If the wire harness or electrical components are short-
circuited, this fuse blows to prevent an electric shock
or fire hazard.
2. The fuse also blows when monitored latch switch
remains closed with the oven door open and when the
monitor switch contact (COM-NC ) closes.
3. The fuse also blows when the H.V. rectifier, H.V. wire
harness, H.V. capacitor, magnetron or secondary
winding of high voltage transformer is shorted.
THERMAL CUT-OUT 150˚C (OVEN)
The thermal cut-out protects the oven against the over
heat during grill cooking or combi grill cooking. If the
temperature rises above 150˚C because the fan motor is
interrupted, the air inlet duct is blocked or the ventilation
openings are obstructed, the thermal cut-out opens and
switches off the all electrical parts. The defective thermal
cut-out re-makes the contact by cooling down.
FUNCTION OF IMPORTANT COMPONENTS
down to zero.
2. The shut-off relay (RY1) energised, turning on the oven
lamp, turntable motor and cooling fan motor.
3. The power supply voltage is added to the grill heater
and power transformer alternately.
4. The grill heater operates through the heater relay
(RY1) contacts and the high voltage transformer oper-
ates through the cook relay (RY3) contacts.
5. These are operated by the CPU unit to supply alter-
nately within a 32 second time base, grill heat and
microwave energy.
NOTE: The ON and OFF time ratio does not correspond
with the percentage of microwave power, because approx.
2 seconds are needed for heating of the magnetron
filament.
OPERATION SEQUENCE
DOOR OPEN MECHANISM
The door can be opened by pulling the door.
Figure D-1. Door Open Mechanism
MONITORED LATCH SWITCH (SW1) AND STOP
SWITCH (SW3)
1. When the oven door is closed, the contacts (COM-
NO) must be closed.
2. When the oven door is opened, the contacts (COM-
NO) of each switch must be opened.
MONITOR SWITCH (SW2)
1. When the oven door is closed, the contacts (COM-
NC) must be opened.
2. When the oven door is opened, the contacts (COM-
NC) must be closed.
3. If the oven door is opened and the contacts (COM-
NO) of the monitored latch switch (SW1) fail to open,
the fuse F1 blows immediately after closing the con-
tacts (COM-NC) of the monitor switch (SW2).
CAUTION: BEFORE REPLACING A BLOWN FUSE F1
TEST MONITORED LATCH SWITCH (SW1)
AND MONITOR SWITCH (SW2) FOR
PROPER OPERATION. (REFER TO CHAP-
TER “TEST PROCEDURE”).
Latch hook
SW3: Stop switch
Door
SW2: Monitor switch
SW1:Monitored latch switch
Latch heads
R64ST_S.MANUAL
12/8/01, 11:01 am
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