Sharp R-520LK ユーザーズマニュアル
8
R - 5 2 0 L K
R-520LW
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions dur-
ing oven operation.
ing oven operation.
OFF CONDITION
Closing the door activates the door sensing switch and pri-
mary interlock switch. (In this condition, the monitor switch
contacts are opened.)
When oven is plugged in, 10 volts A.C. is supplied to the
control unit. (Figure O-1).
mary interlock switch. (In this condition, the monitor switch
contacts are opened.)
When oven is plugged in, 10 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
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
will appear.
COOKING CONDITION
Program desired cooking time by touching the NUMBER
pads. Program the power level by touching the POWER
LEVEL pad and then a Number pad.
When the START pad is touched, the following operations
occur:
pads. Program the power level by touching the POWER
LEVEL pad and then a Number 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-)
RELAY
CONNECTED COMPONENTS
RY-1
oven lamp/turntable motor/fan motor
RY-
power transformer
. 10 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
370 volts A.C. on the high voltage winding.
A.C. output on the filament winding, and approximately
370 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.
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.
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.
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. When the door is opened during a cook cycle, the monitor
switch, door sensing switch, primary interlock switch, relay
(RY1) and secondary interlock relay 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.
(RY1) and secondary interlock relay 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 electrically monitors the operation
of the primary interlock switch and secondary interlock
relay and is mechanically associated with the door so
that it will function in the following sequence.
that it will function in the following sequence.
(1) When the door opens from the closed position, the
secondary interlock relay (RY) and primary interlock
switch open their contacts. And contacts of the relay
(RY1) remains closed. Then the monitor switch contacts
close.
switch open their contacts. And contacts of the relay
(RY1) remains closed. Then the monitor switch contacts
close.
() When the door is closed from the open position, the
monitor switch contacts open first. Then the contacts
of the primary interlock switch and door sensing switch
close. And contacts of the relay (RY1) open.
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
(RY) fail with the 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 (RY), causing
the monitor fuse to blow.
(RY) fail with the 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 (RY), causing
the monitor fuse to blow.
POWER LEVEL P-0 TO P-90 COOKING
When Variable Cooking Power is programmed, the 10
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-) which is operated by
the control unit within a 3 second time base. Microwave
power operation is as follows:
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-) which is operated by
the control unit within a 3 second time base. Microwave
power operation is as follows:
VARI-MODE
ON TIME
OFF TIME
Power 10(P-HI)
3 sec.
0 sec.
(100% power)
Power 9(P-90)
Power 9(P-90)
30 sec.
sec.
(approx. 90% power)
Power 8(P-80)
6 sec.
6 sec.
(approx. 80% power)
Power 7(P-70)
Power 7(P-70)
4 sec.
8 sec.
(approx. 70% power)
Power 6(P-60)
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)
1 sec.
0 sec.
(approx. 30% power)
Power (P-0)
Power (P-0)
8 sec.
4 sec.
(approx. 0% power)
Power 1(P-10)
6 sec.
6 sec.
(approx. 10% power)
Power 0(P-0)
0 sec.
3 sec.
(0% power)
Note: The ON/OFF time ratio does not correspond with the
percentage of microwave power, because approx.
seconds are needed for heating of the magnetron
filament.
seconds are needed for heating of the magnetron
filament.