Sharp R-82FBSTM (serv.man2) Service Manual ▷ View online
R-82FBSTM - 7
OPERATION SEQUENCE
GRILL COOKING CONDITION
TOP GRILL (Figure O-3a)
In this condition the food is cooked by the top grill heating
element . Rotate the COOKING MODE dial to
In this condition the food is cooked by the top grill heating
element . Rotate the COOKING MODE dial to
TOP GRILL
setting. Enter the desired cooking time by rotating the TIME/
WEIGHT dial. When the START button is pressed, the following
operations occur:
WEIGHT dial. When the START button is pressed, 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
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.
BOTTOM GRILL
(Figure O-3b)
In this condition the food is cooked by bottom grill heating
element energy. Rotate the COOKING MODE dial to
element energy. Rotate the COOKING MODE dial to
BOT-
TOM GRILL setting. Enter the desired cooking time by rotating
the TIME/WEIGHT dial. When the START button is pressed, the
following operations occur:
the TIME/WEIGHT dial. When the START button is pressed, 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
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.
TOP AND BOTTOM GRILLS
(Figure O-3c)
In this condition the food is cooked by top and bottom grill heating
elements energy. Rotate the COOKING MODE dial to
elements energy. Rotate the COOKING MODE dial to
TOP
AND BOTTOM GRILLS setting. Enter the desired cooking time
by rotating the TIME/WEIGHT dial. When the START button is
pressed, the following operations occur:
by rotating the TIME/WEIGHT dial. When the START button is
pressed, 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
energized.
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.
CONVECTION COOKING CONDITION
PRE-HEATING
(Figure O-4)
Rotate the COOKING MODE dial to the
convection setting
and programme the desired convection temperature by touching
CONVECTION button. When the STARTbutton is touched, the
following operations occur:
1. The coil shut-off relays RY1 and RY6 are energized, the oven
CONVECTION button. When the STARTbutton is touched, the
following operations occur:
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.
and bottom heating elements.
3. When the oven temperature reaches the selected pre-heat
temperature, the following operations occur:
3-1. 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.
circuit to the top and bottom grill heating elements.
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
be cooked in the oven. Rotate the COOKING MODE dial to the
sound indicating that the holding the temperature has been
reached in the oven cavity. Open the door and place the food to
be cooked in the oven. Rotate the COOKING MODE dial to the
convection setting and enter the cooking time by rotating the
TIME/WEIGHT dial. Select the desired cooking temperature by
pressing the CONVECTION button. When the START button is
pressed, the following operations occur:
1. The numbers on the digital readout start the count down to
pressing the CONVECTION button. When the START button is
pressed, 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
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 heat-
ing elements to return to the selected cooking temperature.
main supply voltage is applied to the top and bottom heat-
ing 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 rises 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.
motor, convection motor, top and bottom heating elements
are de-energized. At the end of convection cycle, if the cavity
air temperature rises 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.
DUAL COOKING CONDITION
MICROWAVE AND CONVECTION
(Figure O-5a)
Rotate the COOKING MODE dial to
DUAL 1 setting. Enter
the desired cooking time by rotating the TIME/WEIGHT dial.
Press MICROWAVE POWER LEVEL button to set the desired
microwave power. Press the CONVECTION button to set the
cooking temperature. When the START button is pressed, the
following operations occur:
Press MICROWAVE POWER LEVEL button to set the desired
microwave power. Press the CONVECTION button to set the
cooking temperature. When the START button is pressed, 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
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.
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.
MICROWAVE AND TOP GRILL (Figure O-5b)
Rotate the COOKING MODE dial to
DUAL 2 setting, and
enter the desired cooking time by rotating the TIME/WEIGHT
dial. Press MICROWAVE POWER LEVEL button to set the
desired microwave power. When the START button is pressed,
the following operations occur:
dial. Press MICROWAVE POWER LEVEL button to set the
desired microwave power. When the START button is pressed,
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
energized.
R-82FBSTM - 8
POWER OUTPUT
ON TIME
OFF TIME
100%
54 sec.
0 sec.
90%
49 sec.
5 sec.
80%
45 sec.
9 sec.
70%
40 sec.
14 sec.
60%
36 sec.
18 sec.
50%
29 sec.
25 sec.
40%
24 sec.
30 sec.
30%
18 sec.
36 sec.
20%
13 sec.
41 sec.
10%
9 sec.
45 sec.
AUTOMATIC COOKING
PIZZA
BREAKFAST
EXPRESS COOK
EXPRESS DEFROST
MEAL IN ONE
Above functions are automatic cooking. They automati-
cally work out the correct cooking mode and cooking time
and/or cooking temperature. They will cook according to
the special cooking sequence.
BREAKFAST
EXPRESS COOK
EXPRESS DEFROST
MEAL IN ONE
Above functions are automatic cooking. They automati-
cally work out the correct cooking mode and cooking time
and/or cooking temperature. They will cook according to
the special cooking sequence.
AUTO POWER CONTROL OPERATION
The magnetron, top or bottom heating elements, the fan
motor or the convection motor will operate in accordance
with following specification.
motor or the convection motor will operate in accordance
with following specification.
The power level is not reduced 1 time cooking. But only in case same menu is repeated within
1min 15sec, the power level of micro and grill is reduced from 100% to 70% in 20mins after
starting of last cooking. (Even if the time of the last cooking is longer than 20mins, the power
level isn't reduced on the last cooking, and it is reduced from the beginning of the next
cooking.) However, in time calculated from the start of the 1st cooking, even if the Cook mode
changed, when repetition cooking of the menu with which 100% of top & bottom heaters
continues are performed, as shown in the following table, the power down of the cooking of
the 2nd henceforth is carried out. (The 1st cooking is not applied)
1min 15sec, the power level of micro and grill is reduced from 100% to 70% in 20mins after
starting of last cooking. (Even if the time of the last cooking is longer than 20mins, the power
level isn't reduced on the last cooking, and it is reduced from the beginning of the next
cooking.) However, in time calculated from the start of the 1st cooking, even if the Cook mode
changed, when repetition cooking of the menu with which 100% of top & bottom heaters
continues are performed, as shown in the following table, the power down of the cooking of
the 2nd henceforth is carried out. (The 1st cooking is not applied)
In case same cooking mode is repeated within 1min 15sec (including stop, end), oven
calculates total cooking time and reduce the power level.
calculates total cooking time and reduce the power level.
1. OUTPUT POWER CONTROL (MANUAL COOK)
OPERATION MODE
DEVICE
POWER CONTROL
MICROWAVE (100%)
SINGLE OPERATION
SINGLE OPERATION
Microwave
100% 20min, then 70%
TOP GRILL (100%)
SINGLE OPERATION
Top heater
100% 15min, then 50%
BOTTOM GRILL (100%)
SINGLE OPERATION
Bottom heater
100% 15min, then 50%
TOP(100%)/BOTTOM(100%)
Top heater
100% 6min then 70% and 70% 9min then 50%
DUAL OPERATION
Bottom heater
100% 6min then 70% and 70% 9min then 50%
MICRO(100%)/TOP GRILL(100%)
Microwave
100% 20min, then 70%
DUAL OPERATION
Top heater
100% 15min, then 50%
MICRO(70 - 10%)/TOP GRILL(100%)
Microwave
-
DUAL OPERATION
Top heater
100% 15min, then 50%
MICRO(100%)/BOTTOM GRILL(100%)
Microwave
100% 20min, then 70%
DUAL OPERATION
Bottom heater
100% 15min, then 50%
MICRO(70 - 10%)/BOTTOM GRILL(100%)
Microwave
-
DUAL OPERATION
Bottom heater
100% 15min, then 50%
Microwave
Repeat Cook
Top heater
Bottom heater
2. OUTPUT POWER CONTROL (AUTO COOK)
Repeat Auto Cook
OPERATION SEQUENCE
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 simulta-
neously.
MICROWAVE AND BOTTOM GRILL
(Figure O-5c
)
Rotate the COOKING MODE dial to
DUAL 3 setting, and
enter the desired cooking time by rotating the TIME/WEIGHT
dial. Press MICROWAVE POWER LEVEL button to set the
desired microwave power. When the START button is pressed,
the following operations occur:
dial. Press MICROWAVE POWER LEVEL button to set the
desired microwave power. When the START button is pressed,
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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom 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 bottom grill
simultaneously.
R-82FBSTM - 9
3. COOLING FAN OPERATION
OPERATION MODE
DEVICE
POWER CONTROL
PREHEAT
Cooling
60%
CONV.
Cooling fan
60% 60 min. then 100%
Others
Cooling fan
100%
After cooking
Cooling fan
Indication
4. CONVECTION POWER SETTING
PREHEATING
TEMP
250˚C, 230˚C, 220˚C, 200˚C, 180˚C, 160˚C, 130˚C, 100˚C, 70˚C, 40˚C
HEATING TOP
100%
ELEMENT BOTTOM
100%
COOLING FAN
60%
CONV. FAN
0%
CONVECTION
TEMP
250˚C
230˚C
220˚C
200˚C
180˚C
160˚C
130˚C
100˚C
70˚C
40˚C
WITHOUT
HEATING
TOP
50%
40%
40%
30%
20%
10%
10%
10%
10% 10%
PREHEATING ELEMENT BOTTOM
100%
90%
80%
70%
70%
60%
50%
40%
30% 20%
WITH
HEATING
TOP
50%
40%
40%
30%
20%
10%
10%
10%
10% 10%
PREHEATING ELEMENT BOTTOM
90%
70%
60%
50%
50%
50%
50%
40%
30% 20%
COOLING FAN
60% 60min, then 100%
CONV. FAN
100%
0%
DUAL CONVECTION
TEMP
250˚C
230˚C
220˚C
200˚C
180˚C
160˚C
130˚C
100˚C
70˚C
40˚C
WITHOUT
HEATING
TOP
50%
40%
40%
30%
20%
10%
10%
10%
10% 10%
PREHEATING ELEMENT BOTTOM
100%
90%
80%
70%
70%
60%
50%
40%
30% 20%
WITH
HEATING
TOP
50%
40%
40%
30%
20%
10%
10%
10%
10% 10%
PREHEATING ELEMENT BOTTOM
90%
70%
60%
50%
50%
50%
50%
40%
30% 20%
MICRO
10%,30%,50%
COOLING FAN
100%
CONV. FAN
100%
0%
NOTE
The oven temp was checked by the thermometer when each stages are started .
If the oven temp is same or higher than 105˚C, the oven was judged as "with preheating".
When the oven temp is lower than 105˚C or the cooling fan stops, the oven was judged as "without
preheating".
preheating".
The cooling fan continues to rotate when Oven temperature is more than 120˚C. Then,
it stops when it is less than 105˚C
it stops when it is less than 105˚C
NOW COOLING is indicated during the cooling fan movement after operation is finished.
(It isn't indicated during a fan movement to stop on the way.)
(It isn't indicated during a fan movement to stop on the way.)
OPERATION SEQUENCE
R-82FBSTM - 10
D2
D1
ASYMMETRIC
RECTIFIER
RECTIFIER
HIGH VOLTAGE
RECTIFIER
RECTIFIER
A
B
C
FUNCTION OF IMPORTANT COMPONENTS
The door can be opened by pulling the door handle. When
the handle is pulled, the latch head is pulled, the latch head
is moved upward, and released from the latch hook now
the door can be opened.
the handle is pulled, the latch head is pulled, the latch head
is moved upward, and released from the latch hook now
the door can be opened.
MONITORED LATCH SWITCH
1. When the oven door is closed, the contacts (COM-NO)
of the switch must be closed. The contacts (COM-NC) must
be opened.
be opened.
2. When the oven door is opened, the contacts (COM-NO) of
the switch must be opened. The contacts (COM-NC) must be
closed.
closed.
STOP SWITCH
1. When the oven door is closed, the contacts (COM-NO) of the
switch must be closed.
2. When the oven door is opened, the contacts (COM-NO) of
switch must be opened.
MONITOR SWITCH
The monitor switch is activated (the contacts opened) by the upper
latch head on the door while the door is closed. The switch is
intended to render the oven inoperative by means of blowing the
fuse F8A when the contacts of the monitored latch switch fail to open
when the door is opened.
Function
1. When the door is opened, the contacts (COM-NC) of monitor
latch head on the door while the door is closed. The switch is
intended to render the oven inoperative by means of blowing the
fuse F8A when the contacts of the monitored latch switch fail to open
when the door is opened.
Function
1. When the door is opened, the contacts (COM-NC) of monitor
switch close (to the ON condition) due to their being normally
closed and contacts (COM-NO) open. At this time the con-
tacts (COM-NO) of monitored latch switch is in the OFF
condition (contacts open) due to their being normally open
contact switches.
closed and contacts (COM-NO) open. At this time the con-
tacts (COM-NO) of monitored latch switch is in the OFF
condition (contacts open) due to their being normally open
contact switches.
2. As the door goes closed, the monitor switch contacts (COM-
NC) are opened and contacts (COM-NO) are closed. The
contacts (COM-NO) of monitored latch switch and stop switch
are closed.(On opening the door, each of these switches
operate inversely.)
contacts (COM-NO) of monitored latch switch and stop switch
are closed.(On opening the door, each of these switches
operate inversely.)
3. If the door is opened and the monitored latch switch con-
tacts (COM-NO) fail to open, the fuse F8A blows immedi-
ately after closing of the monitor switch (COM-NC) contacts.
ately after closing of the monitor switch (COM-NC) contacts.
CAUTION: BEFORE REPLACING A BLOWN FUSE F8A,
TEST THE MONITORED LATCH SWITCH AND
MONITOR SWITCH FOR PROPER OPERATION.
(REFER TO CHAPTER “TEST PROCEDURE”)
MONITOR SWITCH FOR PROPER OPERATION.
(REFER TO CHAPTER “TEST PROCEDURE”)
FUSE 20A 250V
If the wire harness or electrical components are short-circuited,
this fuse blows to prevent an electric shock or fire hazard.
this fuse blows to prevent an electric shock or fire hazard.
FUSE F8A 250V
1. If the wire harness or electrical components are short-
circuited, this fuse blows to prevent an electric shock or fire
hazard.
hazard.
2. The fuse also blows when the monitored latch switch remains
closed with the oven door open and when the monitor switch
contact (COM-NC) closes.
contact (COM-NC) closes.
3. The fuse also blows when the asymmetric rectifier, H.V.
rectifier, H.V. wire harness, H.V. capacitor, magnetron or
secondary winding of high voltage transformer is shorted.
secondary winding of high voltage transformer is shorted.
TC TRANSFORMER
T/C transformer converts A.C. line voltage into low voltage to
drive the control unit.
drive the control unit.
THERMAL CUT-OUT 125˚C (MG)
This thermal cut-out protects the magnetron against overheat.
If the temperature goes up higher than 125˚C because the fan
motor is interrupted or the ventilation openings are blocked, the
thermal cut-out will open and line voltage to the high voltage
transformer will cut off and operation of the magnetron will be
stopped. The defective thermal cut-out must be replaced with a
new one.
If the temperature goes up higher than 125˚C because the fan
motor is interrupted or the ventilation openings are blocked, the
thermal cut-out will open and line voltage to the high voltage
transformer will cut off and operation of the magnetron will be
stopped. The defective thermal cut-out must be replaced with a
new one.
THERMAL CUT-OUT 160˚C (OVEN)
This thermal cut-out protects against overheating or fire inside the
oven. If the temperature rises above 160˚C the thermal cut-out
opens, the oven will switch off.The defective thermal cut-out must
be replaced with a new one.
oven. If the temperature rises above 160˚C the thermal cut-out
opens, the oven will switch off.The defective thermal cut-out must
be replaced with a new one.
ASYMMETRIC RECTIFIER
T
he asymmetric rectifier is solid state device that prevents
current flow in both directions. It prevents the temperature rise of
the high voltage transformer by blowing the fuse F8A when the
high voltage rectifier is shorted.
the high voltage transformer by blowing the fuse F8A when the
high voltage rectifier is shorted.
The rated peak reverse voltage of D1 of the asymmetric
r
r
ectifier is 6 KV. The rated peak reverse voltage of D2 of the
asymmetric rectifier is 1.7 KV. D1 and D2 of the
asymmetric rectifier or high voltage rectifier are shorted when the
each peak reverse voltage goes beyond the each rated peak
reverse voltage. (The process of the blowing the fuse F8A.)
1. The high voltage rectifier is shorted by some fault when
asymmetric rectifier or high voltage rectifier are shorted when the
each peak reverse voltage goes beyond the each rated peak
reverse voltage. (The process of the blowing the fuse F8A.)
1. The high voltage rectifier is shorted by some fault when
microwave cooking or dual cooking.
2. The peak reverse voltage of D2 of the rectifier goes beyond
the rated peak reverse voltage 1.7 KV in the voltage doubler
circuit.
circuit.
3. D2 of the rectifier is shorted.
4. The large electric currents flow through the high voltage
4. The large electric currents flow through the high voltage
winding of the high voltage transformer.
5. The large electric currents beyond 8A flow through the
primary winding of the high voltage transformer.
6. The fuse F8A blows by the large electric currents.
7. The power supplying to the high voltage transformer is cut off.
7. The power supplying to the high voltage transformer is cut off.
Latch hook
Door
SW2: Stop switch
Latch
Heads
Heads
SW3: Monitor switch
SW1: Monitored
latch switch
Tab
Figure D-1. Door Open Mechanism
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