Acer R-1200 Manuale di Servizio Scaricare il pdf (Pagina 8)

R-1200

R-1201

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions during

oven operation.

OFF CONDITION

Closing the door activates the door sensing switch and

primary 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 flashing "88 : 88".

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

touch the STOP/CLEAR pad. The display will clear,

and " : " will appear .

COOKING CONDITION

Program desired cooking time touching the NUMBER pads.

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

RY1 Oven lamp / Fan motor / Turntable motor

RY2 Power transformer

RY3, RY4 Hood lamp

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

power transformer and is converted to about 3.3 volts

A.C. output on the filament winding, and approximately

2000 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, primary interlock switch,

relay (RY1) and secondary interlock relay (RY2) are

activated with the following results. The circuits to the

cooling fan motor, the turntable 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 switch and secondary interlock

relay (RY2) 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

secondary interlock relay (RY2) and primary interlock

switch open their contacts. And contacts of the relay

(RY1) remains closed. 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 switch and door

sensing switch close. And contacts of the relay

(RY1) open.

If the primary interlock switch and secondary interlock relay

(RY2) 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

switch, relay (RY1) and secondary interlock relay (RY2),

causing the monitor 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 (RY2) which is operated by the

control unit within an interval second time base. Microwave

power operation is as follows:

VARI-MODE ON TIME OFF TIME

Power 10(P-HI) 32 sec. 0 sec.

(100% power)

Power 9(P-90) 30 sec. 2 sec.

(approx. 90% power)

Power 8(P-80) 26 sec. 6 sec.

(approx. 80% power)

Power 7(P-70) 24 sec. 8 sec.

(approx. 70% power)

Power 6(P-60) 22 sec. 10 sec.

(approx. 60% power)

Power 5(P-50) 18 sec. 14 sec.

(approx. 50% power)

Power 4(P-40) 16 sec. 16 sec.

(approx. 40% power)

Power 3(P-30) 12 sec. 20 sec.

(approx. 30% power)

Power 2(P-20) 8 sec. 24 sec.

(approx. 20% power)

Power 1(P-10) 6 sec. 26 sec.

(approx. 10% power)

Power 0(P-0) 0 sec. 32 sec.

(0% power)

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

the percentage of microwave power, because

approx. 3 seconds are needed for heating of the

magnetron filament.

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Acer R-1200 Manuale di Servizio Pagina 8

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