Sharp R-890SLM Service Manual ▷ View online
R-890SLM
CHAPTER 3. PRODUCT SPECIFICATIONS
[1] SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
230 - 240 Volts / 50 Hertz / Single phase, 3 wire earthed
Power Consumption
Microwave cooking 1.50 kW Approx. 6.5A
Convection cooking 1.91 kW Approx. 8.0 A
Convection cooking 1.91 kW Approx. 8.0 A
Grill cooking
Top Grill mode ---------------------- 1.25kW Approx. 5.2A
Bottom Grill mode ----------------- 0.70kW Approx. 2.9A
Top and Bottom mode ------------ 1.90kW Approx. 7.9A
Combi cooking
Micro and Top Grill ---------------- 2.70kW Approx. 11.5A
Micro and Bottom Grill ------------2.15kW Approx. 9.2A
Micro and Convection ------------ 2.16kW Approx. 9.3A
Power Output
900 watts nominal of RF microwave energy (IEC60705 Test Procedure)
Operating frequency 2450 MHz
Top Grill heating element
Power Output
1200W
Bottom heating element
Power Output
650W
Outer Case Dimensions
Width 520 mm
Height 309 mm including foot
Depth 683.5 mm
NOTE: The Depth does not include the door opening handle.
Cooking Cavity Dimensions
Width 353 mm
Height 207 mm
Depth 357 mm
NOTE: Internal capacity is calculated by measuring maximum width, depth
and height. Actual capacity for holding food is less.
Turntable diameter
325 mm
Control Complement
Jog Touch Control System
Clock (1:00 - 12:59) / Timer (0 - 99 minutes)
Microwave Power for Variable Cooking
Repetition Rate;
100P (HIGH) ......................................... Full power throughout the cooking time
70P (MEDIUM HIGH) ............................................ approx. 70% of FULL Power
50P (MEDIUM) ...................................................... approx. 50% of FULL Power
30P (MEDIUM LOW) ............................................. approx. 30% of FULL Power
10P (LOW) ............................................................ approx. 10% of FULL Power
Convection temperature control range:
250°C, 230°C, 220°C, 200°C, 180°C, 160°C, 130°C, 100°C, 70°C and 40°C
EXPRESS COOK button
EXPRESS DEFROST button
ENTER button
COMBI button
MICRO POWER button
GRILL button
CONV.(ºC) button
QUICK&EASY button
SHORT CUTS button
INFO button
AUTO COOK button
AUTO MINUTE button
STOP/CLEAR button
KITCHEN TIMER/CLOCK button
START button
ENCODER dial
ENTER button
Net Weight
Approx. 19 kg
As part of our policy of continuous improvement, we reserve the right to alter design and specifications without notice.
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CHAPTER 4. APPEARANCE VIEW
[1] OVEN
1. Control panel
2. Oven lamp
3. Waveguide cover
4. Bottom Grill heating element
5. Turntable motor shaft
6. Oven cavity
7. Door seals and sealing surfaces
8. Door latches
9. Door opening handle
10. Top Grill heating element
11. Convection fan
12. Ventilation openings
13. Outer case cabinet
14. Power cord
15. Turntable
16. High rack
17. Low rack
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[2] TOUCH CONTROL PANEL
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DIGITAL DISPLAY
INDICATORS:
1. LESS/MORE
2. INFO
3. COOK
4. MICROWAVE
5. CONVECTION
6. BOTTOM GRILL
7. TOP GRILL
1. DIGITAL DISPLAY
OPERATING BUTTONS:
2. EXPRESS COOK button
3. EXPRESS DEFROST buttons
4. MICRO POWER button
5. COMBI button
6. CONV.(ºC) button
7. GRILL button
8. SHORT CUTS button
9. QUICK & EASY button
10. AUTO MINUTE button
11. AUTO COOK button
12. INFO button
13. START button
14. KITCHEN TIMER button
15. STOP/CLEAR button
16. ENCODER dial
Rotate the dial so that light show on menu
17. ENTER button
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[1] OFF CONDITION
Closing the door activates the monitored latch switch and the
stop switch.
IMPORTANT
When the oven door is closed, the contacts COM-NC of the
When the oven door is closed, the contacts COM-NC of the
monitor switch must be open. When the microwave oven is
plugged in a wall outlet (230 - 240V / 50Hz), the line voltage
is supplied to the noise filter.
Figure O-1 on page 13-1
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 monitored
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 TO CANCEL ENERGY SAVE MODE SET THE
CLOCK” (Fig. O-1(b)).
3. Close the door. The contacts (COM-NC) of the monitored
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 min-
utes, 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.
[2] MICROWAVE COOKING CONDITION
1. HIGH COOKING
Press MICRO POWER button. And enter the cooking time by
rotate ENCODER dial. And start the oven by press START button.
Function sequence
Function sequence
Figure O-2 on page 13-2
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 12.24cm. 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.
CHAPTER 5. OPERATION SEQUENCE
SWITCH
CONTACT
CONDITION
DURING
COOKING
DOOR OPEN
(NO COOKING)
Monitored latch
switch
COM-NO
COM-NC
Closed
Opened
Opened
Closed
Stop switch
COM-NO
Closed
Opened
Monitor switch
COM-NO
COM-NC
Closed
Opened
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 moni-
tored 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
relay RY2 and RY6 are made open when the door is opened.
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 monitored latch switch.
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. After that
the contacts (COM-NC) of the monitor switch and monitored
latch can be closed.
2) When the oven door is closed, the contacts (COM-NC) of
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.
3) When the oven door is opened and the contacts (COM-NO)
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.
2. MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
COOKING
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 current-limiting relay RY2. The
following levels of microwave power are given.
SETTING;
SETTING;
100P (HIGH)
32 sec. ON
70P
(MEDIUM HIGH)
Approx. 70%
100%
24 sec. ON
8 sec. OFF
14 sec. OFF
20 sec. OFF
26 sec. OFF
18 sec. ON
30P
(MEDIUMLOW)
10P
(LOW)
50P
(MEDIUMLOW)
Approx. 30%
Approx. 50%
Approx. 10%
12 sec. ON
6 sec. ON
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.
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[3] GRILL COOKING CONDITION
1. TOP GRILL (Figure O-3)
In this condition the food is cooked by the top grill heating
element. Press GRILL button. And enter the cooking time by
rotate ENCODER dial. When the START button is pressed, the
following operation occur:
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor and turntable motor are
1. The numbers on the digital readout 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 element.
4. Now, the food is cooked by the top grill heating element.
2. BOTTOM GRILL (Figure O-3b)
In this condition the food is cooked by bottom grill heating
element energy. Press GRILL button 2 times. And enter the
cooking time by rotate ENCODER dial. When the START button
is pressed, the following operation occur:
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor and turntable motor are
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor and turntable motor are
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heating element.
4. Now, the food is cooked by the bottom grill heating element.
3. TOP AND BOTTOM GRILLS (Figure O-3c)
In this condition the food is cooked by top and bottom grill
heating elements energy. Press GRILL button 3 times. And
enter the cooking time by rotate ENCODER dial. When the
START button is pressed, the following operation occur:
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor and turntable motor are
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor and turntable motor are
energized.
3. The relay RY4 is energized and the main supply voltage is
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heating element.
4. The relay RY3 is energized and the main supply voltage is
applied to the top grill heating element.
5. Now, the food is cooked by the top and bottom grill heating
elements.
[4] CONVECTION COOKING CONDITION
1. PRE-HEATING (Figure O-4)
Press CONV. (ºC) button for programme the desired convection
Press CONV. (ºC) button for programme the desired convection
temperature. When the INSTANT COOK/START button is
touched, the following operations occur:
1. The coil shut-off relays RY1 and RY6 are energized, the oven
1. The coil shut-off relays RY1 and RY6 are energized, the oven
lamp, cooling fan motor and turntable motor are turned on.
2. The coil shut-off relays RY3 and RY4 are energized by
control unit and the main supply voltage is added to the top
and bottom heating elements.
3. When the oven temperature reaches the selected pre-heat
temperature, the following operations occur:
1) The coil shut-off relays RY3 and RY4 are energized by
control unit temperature circuit and thermistor, opening the
circuit to the top and bottom grill heating elements.
2) The oven will continue to function for 30 minutes, turning
2) The oven will continue to function for 30 minutes, turning
the top and bottom heating elements on and off, as needed
to maintain the selected pre-heat temperature. The oven
will shut-down completely after 30 minutes.
2. CONVECTION COOKING (Figure O-4)
When the pre-heat temperature is reached, a beep signal will
sound indicating that the holding the temperature has been
reached in the oven cavity. Open the door and place the food
to cooked in the oven. Press CONV.(ºC) button. And enter the
convection time by rotate ENCODER dial. When the START
button is pressed, the following operation occur:
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor, turntable motor and
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor, turntable motor and
convection motor are energized.
NOTE: When the convection temperature 40°C is selected, the
convection motor is not energized.
3. The relays RY3 and RY4 are energized (if the cavity
temperature is lower than selected temperature) and the
main supply voltage is applied to the top and bottom heating
elements to return to the selected cooking temperature.
4. Upon completion of the cooking time, the audible signal will
sound, and the oven lamp, turntable motor, cooling fan motor,
convection motor, top and bottom heating elements are de-
energized. At the end of convection cycle, if the cavity air
temperature rise above 120°C, the circuit to the relay RY6
will be maintained (by the thermistor circuit) to continue
operation of the cooling fan motor until temperature drops
below 105°C, at that time the relay RY6 will be de-energized,
turning off the fan motor.
[5] COMBI COOKING CONDITION
1. MICROWAVE AND CONVECTION (Figure O-5a)
Press MIX button 1 time. And enter the desired cooking time by
Press MIX button 1 time. And enter the desired cooking time by
rotating the ENCODER dial. And press MICRO POWER button
to set the desired microwave power. And press the CONV. (ºC)
button to set the cooking temperature. When the INSTANT
COOK/START button is touched, the following operations occur:
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor, turntable motor and
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor, turntable motor and
convection motor are energized.
3. The relay RY3 will be energized and the main supply voltage
is applied to the top grill heating element.
4. The relay RY4 is energized (if the cavity temperature is lower
than selected temperature) and the main supply voltage is
applied to the bottom heating element.
5. The relay RY2 is energized and the microwave energy is
generated by magnetron.
6. Now, the food is cooked by microwave and convection
energy simultaneously
2. MICROWAVE AND TOP GRILL (Figure O-5b)
Press MIX button 2 times. And enter the desired cooking time
Press MIX button 2 times. And enter the desired cooking time
by rotating the ENCODER dial. And press MICRO POWER
button to set the desired microwave power. When the INSTANT
COOK/START button is touched, the following operations occur:
1. The numbers on the digital readout start the count down to zero.
2. The oven lamp, cooling fan motor and turntable motor are
1. The numbers on the digital readout 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
3. The relay RY3 is energized and the main supply voltage is
applied to the top grill 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 top grill
simultaneously.
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