Sharp Carousel R-930CS Service-Handbuch - Seite 8

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R-930CS

The following is a description of component functions during

oven operation.

OFF CONDITION

Closing the door activates the door sensing switch and

secondary interlock switch. (In this condition, the monitor

switch contacts are opened.)

When oven is plugged in, 120 volts A.C. is supplied to the

control unit. (Figure O-1).

1. The display will show "SHARP SIMPLY THE BEST

PRESS CLEAR AND PRESS CLOCK".

To set any program or set the clock, you must first touch

the STOP/CLEAR pad. The display will clear, and " : "

will appear.

NOTE: When the door is opened, the oven lamp comes on.

2. A signal is input to the control unit, energizing the coil of

shut-off relay (RY-4). RY4 contacts close, completing a

circuit to the damper motor. The damper motor now

operates moving the damper to the open position, thereby

closing the contacts of the damper switch inputs a signal

to the control unit. The coil of relay RY-4 is de-energized,

opening its contacts, thereby turning off the damper motor.

COOKING CONDITION

Program desired cooking time Variable Cooking Control by

touching the NUMBER pads and the power level pad. 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)

RELAY

CONNECTED COMPONENTS

RY-1

Oven lamp/Turntable motor

RY-2

Power transformer

RY-3

Heating element

RY-4

Damper motor

RY-5

Convection motor

RY-6

Fan motor

2. 120 volts A.C. is supplied to the primary winding of the

power transformer and is converted to about 3 volts A.C.

output on the filament winding, and approximately 2360

volts A.C. on the high voltage winding.

3. The filament winding voltage heats the magnetron

filament and the H.V. winding voltage is sent to a voltage

doubler circuit.

4. The microwave energy produced by the magnetron is

channelled through the waveguide into the cavity feed-

box, and then into the cavity where the food is placed to

be cooked.

5. 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, door sensing switch, the primary interlock relay

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

and the secondary interlock switch are activated with the

following results. The circuits to the turntable motor, the

cooling fan motor, and the high voltage components are

de-energized, the oven lamp remains on, and the digital

read-out 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 primary interlock relay and the secondary interlock

switch and is mechanically associated with the door so

that it will function in the following sequence.

(1) When the door opens from a closed position, the primary

interlock relay and the secondary interlock switch open

their contacts, and then the monitor switch contacts close.

(2) When the door is closed from the open position, the

monitor switch contacts first open, and then the contacts

of the primary interlock relay and the secondary interlock

switch close.

If the primary interlock relay and the secondary interlock

switch fail with their contacts closed when the door is

opened, the closing of the monitor switch contacts will form

a short circuit through the monitor fuse, primary interlock

relay and the secondary interlock switch, causing the moni-

tor fuse to blow.

POWER LEVEL P-0 TO P-90 COOKING

When Variable Cooking Power is programmed, the 120

volts A.C. is supplied to the power transformer intermittently

through the contacts of relay (RY-2). RY-2 is operated by

the control unit within an varying time base. Microwave

power operation is as follows:

VARI-MODE

Power 10(P-HI) (100% power)

Power 9(P-90) (approx. 90% power)

Power 8(P-80) (approx. 80% power)

Power 7(P-70) (approx. 70% power)

Power 6(P-60) (approx. 60% power)

Power 5(P-50) (approx. 50% power)

Power 4(P-40) (approx. 40% power)

Power 3(P-30) (approx. 30% power)

Power 2(P-20) (approx. 20% power)

Power 1(P-10)(approx. 10% power)

Power 0(P-0) (0% power)

Note: The ON/OFF time ratio does not correspond with

the percentage of microwave power, because

approx. 2 seconds are needed for heating of the

magnetron filament.

CONVECTION COOKING CONDITION

PREHEATING CONDITION

Program desired convection temperature by touching the

CONVECTION pad and the Temperature pad. When the

START pad is touched, the following operations occur:

1. The coil of shut-off relays (RY1, RY3,RY5 and RY6) are

energized, the oven lamp, cooling fan motor, turntable

ON TIME

OFF TIME

32 sec.

0 sec.

30 sec.

2 sec.

26 sec.

6 sec.

24 sec.

8 sec.

22 sec.

10 sec.

18 sec.

14 sec.

16 sec.

12 sec.

20 sec.