Sharp SMC1585BSA User Manual

7
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 second-
ary interlock switch. (In this condition, the monitor switch
contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the noise
filter and 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 dam
per 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-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 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 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 (RY-2). RY-2 is operated by
the control unit within an varying time base. Microwave
power operation is as follows:
EMIT FFOEMIT NOEDOM-IRAV
Power 10(P-HI) (100% power) 32 sec. 0 sec.
Power 9(P-90) (approx. 90% power) 30 sec. 2 sec.
Power 8(P-80) (approx. 80% power) 26 sec. 6 sec.
Power 7(P-70) (approx. 70% power) 24 sec. 8 sec.
Power 6(P-60) (approx. 60% power) 22 sec. 10 sec.
Power 5(P-50) (approx. 50% power) 18 sec. 14 sec.
Power 4(P-40) (approx. 40% power) 16 sec. 16 sec.
Power 3(P-30) (approx. 30% power) 12 sec. 20 sec.
Power 2(P-20) (approx. 20% power) 8 sec. 24 sec.
Power 1(P-10)(approx. 10% power) 6 sec. 26 sec.
Power 0(P-0) (0% power) 0 sec. 32 sec.
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
motor and convection motor are turned on.
2. The coil of relay (RY4) is energized by the control unit. The
damper is moved to the closed position, opening the damper
switch contacts. The opening of the damper switch contacts
sends a signal to the LSI on the control unit de-energizing
the relay (RY4) and opening the circuit to the damper motor.
3. The coil of heater relay (RY3) is energized by the control
unit and the main supply voltage is applied to the heating
element.
SMC1585BSA
SMC1585BBA
SMC1585BWA

Sharp SMC1585BSA Specifications

General

Brand	Sharp
Model	SMC1585BSA
Category	Microwave Oven
Language	English