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R-953/963M - 3

Note for R-963M: When   is high-
lighted in the display, press the

 key to read a specific hint

which may assist you.

1. COOK indicator
2. GRILL indicator
3. CONVECTION indicator
4. MICROWAVE indicator
5. INFO indicator (R-963M only)

CONTROL PANEL:

6. TIME keys
7. EXPRESS COOK key
8. EXPRESS DEFROST key
9. SENS' N' COOK key (R-963M

only) See NOTE.

10. AUTO COOK key
11. LESS/MORE keys

Press to shorten or lengthen cook-
ing/ defrosting time.

12. CONVECTION key
13. DUAL CONVECTION/GRILL

key

14. WEIGHT CONVERSION key
15. AUTO START/CLOCK key
16. START/AUTO MINUTE key (See

NOTE.)

17. INFO key (R-963M only)
18. STOP/CLEAR key
19. KITCHEN TIMER key
20. MICROWAVE POWER LEVEL

key

21. GRILL key
22. WEIGHT keys

15.Low Rack
16.High Rack
17.Square shelves (x2)

1. Grill heating element
2. Oven lamp
3. Control panel
4. Shelf runners
5. Waveguide cover
6. Oven cavity
7. Coupling
8. Door seals and sealing surfaces
9. Door opening handle
10.Air-vent openings
11.Outer cabinet
12.Power cord
13.Turntable
14.Turntable support

COOK

DEFROST

1 Oven Ready Pizza
2 Crispy Crumb Foods
3 Baked Potatoes
4 Oven Chips
5 Yorkshire Pudding
6 Cake

ROAST
BEEF / LAMB

CHICKEN
PORTIONS

CHILLED
READY MEALS

FRESH
READY MEALS

ROAST PORK

MINCED MEAT

STEAK / CHOPS

CANNED FOOD

FRESH FISH

FRESH VEG.

RICE / PASTA

ROAST POULTRY

COOK

COOK

DEFROST

1 Chilled Ready Meals
2 Frozen Ready Meals
3 Crispy Crumb Foods
4 Oven Ready Pizza
5 Oven Chips
6 Baked Potatoes
7 Rice / Pasta
8 Cake

ROAST
BEEF / LAMB

CHICKEN
PORTIONS

ROAST PORK

MINCED MEAT

STEAK / CHOPS

ROAST POULTRY

COOK

16

3

2

1

4

12

11

10

13

8

9

14

15

17

7

6

5

R-953/963M - 4

Closing the door activates the monitored latch switch and
the stop switch.

1. The control unit is not energized. The display shows

nothing (Fig. O-1 (a)).

2. Open the door. The contacts (COM-NC) of the moni-

tored latch switch are closed and the control unit is
energized. Then contacts of relays RY1 and RY5 are
closed, and the oven lamp will light and the display will
show "ENERGY SAVE MODE" (Fig. O-1(b)).

3. Close the door. The contacts (COM-NC) of the moni-

tored latch switch are opened and the contacts of relay
RY1 are opened and the oven lamp will be turned off.
The display will show "  .  

0

". (Fig. O-1(c)).

NOTE: Energy save mode
1. If the oven has not been used for more than 3 minutes,

the contacts of the relay RY5 will be opened and the
control unit will be not energized. Open and close the
door, the control unit will resume.

2. If the clock is set, this energy save mode does not work.
3. If the display shows different messages from ENERGY

SAVE MODE, the oven may be set in demo mode.
Close the door, see operation manual to cancel demo
mode.

HIGH COOKING
Enter a desired cooking time by touching the TIME keys
and start the oven by touching START key.

CONNECTED COMPONENTS

RELAY

Oven lamp, Turntable motor

RY1

High voltage transformer

RY2

Fan motor

RY6

1. The line voltage is supplied to the primary winding of

the high voltage 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..

3. The 2450 MHz microwave energy produced in the

magnetron generates a wavelength of 12.24 cm. This
energy is channelled through the waveguide (transport
channel) into the oven cavity, where the food is placed
to be cooked.

4. When the cooking time is up, a signal tone is heard and

the relays RY1 + RY2 + RY6 go back to their home
position. The circuits to the oven lamp, high voltage
transformer, fan motor and turntable motor are cut off.

5. When the oven door is opened during a cooking cycle,

the switches come to the following condition.

Switch

Contact

          Condition
During

Oven Door

Cooking

Open(No cooking)

COM-NO

Closed

Opened

Monitored latch switch

COM-NC

Opened

Closed

Stop switch

COM-NO

Closed

Opened

COM-NO

Closed

Opened

Monitor Switch

COM-NC

Opened

Closed

The circuit to the high voltage transformer is cut off when
the contacts of relay RY2, and the contacts (COM-NO) of
the monitored latch switch and monitor switch are made
open. The circuit to the fan motor is cut off when the relay
RY6 is made open. The circuit to the turntable motor is cut
off when the contacts (COM-NO) of the monitored latch
switch are made open. The oven lamp remains on even if
the oven door is opened after the cooking cycle has been
interrupted, because the relay RY1  stays closed. Shown
in the display is remaining time.
6. MONITOR SWITCH CIRCUIT

The monitor switch is mechanically controlled by the
oven door, and monitors the operation of the moni-
tored latch switch.

6-1. When the oven door is opened during or after the

cycle of a cooking program, the monitored latch
switch and stop switch must open their contacts
(COM-NO) first. And the contacts (COM-NC) of the
monitored latch switch are made closed. After that the
contacts (COM-NC) of the monitor switch can be
closed and the contacts (COM-NO) of monitor switch
are made open.

6-2. When the oven door is closed, the contacts (COM-

NC) of the monitor switch SW3 must be opened and
the contacts (COM-NO) of monitor switch must be
closed. After that the contacts (COM-NO)  of the
monitored latch switch and the stop switch are made
closed. And the contacts (COM-NC) of the monitored
latch switch are made open.

6-3. When the oven door is opened and the contacts

(COM-NO) of  the monitored latch switch remain
closed, the fuse F8A will blow. Because the relay RY1
and monitor switch are closed  and a short circuit is
caused.

When the microwave oven is preset for variable cooking
power, the line voltage is supplied to the high voltage
transformer intermittently within a 32-second time base
through the relay contact which is coupled with the cur-
rent-limiting relay RY2. The following levels of microwave
power are given.

100% (HIGH)

32 sec. ON

70%(MEDIUM 

HIGH)

Approx. 70%

100%

24 sec. ON

8 sec. OFF

14 sec. OFF

20 sec. OFF

26 sec. OFF

50%(MEDIUM)

Approx. 50%

18 sec. ON

30% (MEDIUM 

LOW)

Approx. 30%

12 sec. ON

10%(LOW)

Approx. 10%

6 sec. ON

R-953/963M - 5

Note:

The On/Off time ratio does not exactly correspond
to the percentage of microwave power, because
approx. 3 seconds  are needed for heating up the
magnetron filament.

TOP GRILL (Figure O-3a)
In this condition the food is cooked by the grill heating
element . Programme the desired cooking time by touch-
ing the TIME keys and touch the GRILL key once. When
the START key is touched, the following operations occur:

1. The numbers on the digital read-out start the count

down to zero.

2. The oven lamp, cooling fan motor and turntable motor

are energized.

3. The relay RY3 is energized and the main supply

voltage is applied to the top grill heating elements.

4. Now, the food is cooked by the top grill heating ele-

ments.

NOTE: The convection cooking condition will be curried

out simultaneously until the temperature of the
oven cavity rise to 220˚C.

PRE-HEATING (by 40˚C - 130˚C)
Programme the desired convection temperature  of 40˚C
- 130˚C by touching CONVECTION key. When the START
key is touched, the following operations occur:
1. The relays RY1, RY6  and RY7 are energized, the oven

lamp, turntable motor, fan motor and  convection motor
are turned on.

2. The relay RY4 is energized and the main supply

voltage is applied to the convection heating element.

3. After the temperature of oven cavity rises to the se-

lected one,  the oven will continue to turned the
convection heating element on and off to maintain the
temperature for 30 minutes.

PRE-HEATING (by 160˚C _ 250˚C)
Programme the desired convection temperature  of 160˚C
- 250˚C by touching CONVECTION key. When the START
key is touched, the following operations occur:
1. The relays RY1, RY6  and RY7 are energized, the oven

lamp, turntable motor, fan motor and  convection motor
are turned on.

2. The relay RY4 and RY3 are  is energized and the main

supply voltage is applied to the convection heating
element and the grill heating elements.

3. After the temperature of oven cavity rises to the se-

lected one,  the oven will continue to turned the
convection heating element on and off to maintain the
temperature for 30 minutes. And simultaneously the
grill heating element will be operated at 10% power
output.

CONVECTION COOKING (by 250˚C)
Programme the cooking time by touching TIME keys. And
then programme the convection temperature of 250˚C by
touching CONVECTION key. When the START key is
touched, the following operations occur:
1. The relays RY1, RY6  and RY7 are energized, the oven

lamp, turntable motor, fan motor and  convection motor
are turned on.

2. The relay RY4 and RY3 are energized and the main

supply voltage is applied to the convection heating
element and the grill heating element.

3. The oven will continue to turned the convection heating

element on and off to maintain the temperature for the
programmed cooking time. And simultaneously the
grill heating elements will be operated at 10% power
output.

CONVECTION COOKING (by 40˚C _ 230˚C)
Programme the cooking time by touching TIME keys. And
then programme the desired convection temperature of
40˚C 230˚C by touching CONVECTION key. When the
START key is touched, the following operations occur:
1. The relays RY1, RY6  and RY7 are energized, the oven

lamp, turntable motor, fan motor and  convection motor
are turned on.

2. The relay RY4 is energized and the main supply

voltage is applied to the convection heating element.

3. The oven will continue to turned the convection heating

element on and off to maintain the temperature for the
programmed cooking time.

MICROWAVE AND CONVECTION  (Figure O-5a)
Programme the desired cooking time by touching the
TIME keys. Touch the DUAL CONV./GRILL key once.
Select the microwave power level by touching the MICRO-
WAVE POWER LEVEL key. And select the convection
temperature by touching the CONVECTION key.

NOTE: The 100% microwave power level can not be

selected.

When the START key is touched, the following operations
occur:

1. The numbers on the digital read-out start the count

down to zero.

2. The oven lamp, fan motor, turntable motor and  con-

vection motor are energized.

3. The relay RY4 will be energized and the main supply

voltage is applied to the convection heating element.

4. The relay RY2 is energized and the microwave energy

is generated by magnetron.

5. Now, the food is cooked by microwave and convection

energy simultaneously.

MICROWAVE AND TOP GRILL  (Figure O-5b)
Programme the desired cooking time by touching the
TIME keys. Touch the DUAL CONV./GRILL key twice.
Select the microwave power level by touching the MICRO-
WAVE POWER LEVEL key. When the START key is
touched, the following operations occur:

1. The numbers on the digital read-out start the count

down to zero.

2. The oven lamp, fan motor and turntable motor are

energized.

3. The relay RY3 is energized and the main supply

voltage is applied to the grill heating elements.

4. The relay RY2 is energized and the microwave energy

is generated by magnetron.

5. Now, the food is cooked by microwave and grill simul-

taneously.

R-953/963M - 6

In grill cooking, convection cooking or dual cooking, the
grill heating elements or magnetron operate within a 48
second time base. The following table is the ON / OFF time
ratio at each power output of the grill heating element or
magnetron.

POWER OUTPUT

ON TIME

OFF TIME

100%

48 sec.

0 sec.

90%

44 sec.

4 sec.

80%

40 sec.

8 sec.

70%

36 sec.

12 sec.

60%

32 sec.

16 sec.

50%

26 sec.

22 sec.

40%

22 sec.

26 sec.

30%

16 sec.

32 sec.

20%

12 sec.

36 sec.

10%

8 sec.

40 sec.

Auto Cook functions automatically work out the correct
cooking mode and cooking time and/or cooking tempera-
ture. They will cook according to the special cooking
sequence.

After the same cooking mode is carried out for more than
the basis cooking time, the power output is automatically
reduced by turning the control relays on and off intermit-
tently, as shown in the table below. This is to protect the
oven door against temperature rising.

D

U

A

L

When oven is stopped during cooking, or after the cooking
is completed, the fan motor will operate if the oven cavity
temperature is above 120˚C, and the fan motor will stop if
the  oven cavity temperature is below 105˚C.

If the temperature of oven cavity is higher than 120˚C
after and when operated by 250˚C convection cooking,
250˚C dual convection cooking or 250˚C preheating, the
convection motor will operate for maximum 1 minute until
the oven cavity temperature drops below 105˚C.

When the AH sensor is used, the foods are cooked in
microwave cooking mode without figuring time, power
level or quantity. When the oven senses enough steam
from the food, it relays the information to its microproces-
sor which will calculate the remaining cooking time and
power level needed for best results.
When the food is cooked, water vapour is developed.
The sensor “senses” the vapour and its resistance in-
creases gradually. When the resistance reaches the value
set according to the menu, supplementary cooking is
started. The time of supplementary cooking is deter-
mined by experiment with each food category and input-
ted into the LSI.
An example of how sensor works:

1. Potatoes at room temperature. Vapour is emitted very

slowly.

2. Heat potatoes. Moisture and humidity is emitted rap-

idly. You can smell the aroma as it cooks. ;

3. Sensor detects moisture and humidity and calculates

cooking time and variable power.

MICROWAVE

MICROWAVE

AH SENSOR

Basis cooking

Reduced power Time base

Cooking mode

time (minutes)

output (%)

(seconds)

Microwave (100%)

20

70

32

Grill

15

70

48

Convection

Not reduction

Micro. (70%)

40 (Micro.)

50

48

+ Grill

15 (Grill)

50

48

Micro. (100%)

15 (Micro.)

50

48

+ Grill

15 (Grill)

50

48

Micro. (70%)

40 (Micro.)

50

48

+ Conv.

Not reduction

NOTE:
1. If the multiple sequence cooking is carried out in the

same mode, the basis cooking time is calculated from
the first.

2. Even if the cooking is stopped by the STOP key or

opening the door, the basis cooking time is calculated
from the first.

3. If the same cooking mode is repeated within 1 minute

and 15 seconds, the basis cooking time is calculated
from the first.

4. If the same manu of AUTO COOK is repeated within 1

minute and 15 seconds, the power output of the micro-
wave or the grill will be reduced to 70% after 20 minutes
when the oven is started at first.