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R-8740 (serv.man5)
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Service Manual
Brand
Device
Home Appliance / Microwave Oven / Operation sequence
File
r-8740-sm5.pdf
Date
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Sharp R-8740 (serv.man5) Service Manual ▷ View online

R-8740M  - 8
top and bottom heater.
3. When the oven temperature reaches the selected preheat
temperature, the following operations occur;
3-1. The shut-off relays RY3 and RY4 are de-energized by the
control unit temperature circuit and thermistor, opening
the circuit to the top and bottom heating elements.
3-2. The oven will continue to function for 15 minutes, turning
the convection heating elements on and off, as needed to
maintain the selected preheat temperature. The oven will
shut-down completely after 15 minutes.
CONVECTION COOKING CONDITION (Figure O-4)
When the preheat temperature is reached, a beep signal  will
sound indicating that the holding temperature has been reached
in the oven cavity. Open the door and place the food to be cooked
in the oven. Program desired cooking time  then touch the
CONVECTION key repeatedly to set the temperature.  When
the START key is touched, the following operations occur:
1. The numbers of the digital readout start the count down to
zero.
2. The oven lamp, cooling fan motor, turntable motor and
convection motor are energized.
3. Relays RY3 and RY4 are energized (if the cavity temperature
is lower than the selected temperature) and the main supply
voltage is applied to the top and bottom heaters to return to
the selected cooking temperature.
4. Upon completion of the cooking time, the audible signal will
sound, and oven lamp, turntable motor, cooling fan motor
and convection motor are de-energized. At the end of
convection cycle, if the cavity air temperature is above
104˚C, the circuit to RY5 will be maintained (by the thermistor
circuit) to continue operation of the cooling fan motor until
temperature drops below 104˚C, at that time the relay will
be de-energized, turning off the fan motor .
GRILL COOKING CONDITION
TOP GRILL (Figure O-3a)
In this condition the food is cooked by grill heating element
energy. Programme the desired cooking time and top grill mode
by turning the mode select knob to           " TOP GRILL" and the
second rotary knob to set the time. When the START key 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
energized.
3. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
4. Now the food is cooked by the top grill heater.
GRILL COOKING CONDITION
BOTTOM GRILL (Figure O-3b)
In this condition the food is cooked by bottom grill heating
element energy.  Program the desired cooking time and bottom
grill mode by turning the mode select knob to
 
  "BOTTOM  GRILL" and the second rotary knob to set
the time.  When the START key 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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. Now the food is cooked by the bottom grill heater.
GRILL COOKING CONDITION
TOP AND BOTTOM GRILL (Figure O-3c)
In this condition the food is cooked by the top and bottom grill
heating element energy.  Program the desired cooking time
then set top+bottom grill mode by touching  
  "TOP GRILL"
and   
  "BOTTOM GRILL"keys.  (led's will light on the
display panel).
  "TOP & BOTTOM GRILL" .  When the
START key 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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
5. Now the food is cooked by the top+bottom grill heater.
DUAL COOKING CONDITION
MICROWAVE AND CONVECTION (Figure O-5a)
Program the desired cooking time and then Dual cook mode
by touching the CONVECTION  
  and MICROWAVE keys.
(led's will light on the display panel).  When the START key 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
convection motor are energized.
3. Relay RY4 is energized (if the cavity temperature is lower
than the selected temperature) and the main supply voltage
is applied to the bottom heater.
4. Relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. During operation relay RY2 will de-energize and relay RY3
will be energized and the main supply voltage is applied to
the top grill heater.  This will continue to cycle throughout
this mode.
6. Now the food is cooked by microwave and convection
energy simultaneously.
DUAL COOKING CONDITION
MICROWAVE AND TOP GRILL (Figure O-5b)
Program the desired cooking time and then Dual cook mode
by touching the "TOP GRILL"  
  and MICROWAVE keys
(led's will light on display panel).  When the START key 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
energized.
3. Relay RY3 is energized and the main supply voltage is
applied to the top heater.
4. Relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. Now the food is cooked by microwave and top grill
simultaneously.
 OPERATION SEQUENCE
R-8740M  - 8
top and bottom heater.
3. When the oven temperature reaches the selected preheat
temperature, the following operations occur;
3-1. The shut-off relays RY3 and RY4 are de-energized by the
control unit temperature circuit and thermistor, opening
the circuit to the top and bottom heating elements.
3-2. The oven will continue to function for 15 minutes, turning
the convection heating elements on and off, as needed to
maintain the selected preheat temperature. The oven will
shut-down completely after 15 minutes.
CONVECTION COOKING CONDITION (Figure O-4)
When the preheat temperature is reached, a beep signal  will
sound indicating that the holding temperature has been reached
in the oven cavity. Open the door and place the food to be cooked
in the oven. Program desired cooking time  then touch the
CONVECTION key repeatedly to set the temperature.  When
the START key is touched, the following operations occur:
1. The numbers of the digital readout start the count down to
zero.
2. The oven lamp, cooling fan motor, turntable motor and
convection motor are energized.
3. Relays RY3 and RY4 are energized (if the cavity temperature
is lower than the selected temperature) and the main supply
voltage is applied to the top and bottom heaters to return to
the selected cooking temperature.
4. Upon completion of the cooking time, the audible signal will
sound, and oven lamp, turntable motor, cooling fan motor
and convection motor are de-energized. At the end of
convection cycle, if the cavity air temperature is above
104˚C, the circuit to RY5 will be maintained (by the thermistor
circuit) to continue operation of the cooling fan motor until
temperature drops below 104˚C, at that time the relay will
be de-energized, turning off the fan motor .
GRILL COOKING CONDITION
TOP GRILL (Figure O-3a)
In this condition the food is cooked by grill heating element
energy. Programme the desired cooking time and top grill mode
by turning the mode select knob to           " TOP GRILL" and the
second rotary knob to set the time. When the START key 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
energized.
3. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
4. Now the food is cooked by the top grill heater.
GRILL COOKING CONDITION
BOTTOM GRILL (Figure O-3b)
In this condition the food is cooked by bottom grill heating
element energy.  Program the desired cooking time and bottom
grill mode by turning the mode select knob to
 
  "BOTTOM  GRILL" and the second rotary knob to set
the time.  When the START key 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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. Now the food is cooked by the bottom grill heater.
GRILL COOKING CONDITION
TOP AND BOTTOM GRILL (Figure O-3c)
In this condition the food is cooked by the top and bottom grill
heating element energy.  Program the desired cooking time
then set top+bottom grill mode by touching  
  "TOP GRILL"
and   
  "BOTTOM GRILL"keys.  (led's will light on the
display panel).
  "TOP & BOTTOM GRILL" .  When the
START key 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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
5. Now the food is cooked by the top+bottom grill heater.
DUAL COOKING CONDITION
MICROWAVE AND CONVECTION (Figure O-5a)
Program the desired cooking time and then Dual cook mode
by touching the CONVECTION  
  and MICROWAVE keys.
(led's will light on the display panel).  When the START key 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
convection motor are energized.
3. Relay RY4 is energized (if the cavity temperature is lower
than the selected temperature) and the main supply voltage
is applied to the bottom heater.
4. Relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. During operation relay RY2 will de-energize and relay RY3
will be energized and the main supply voltage is applied to
the top grill heater.  This will continue to cycle throughout
this mode.
6. Now the food is cooked by microwave and convection
energy simultaneously.
DUAL COOKING CONDITION
MICROWAVE AND TOP GRILL (Figure O-5b)
Program the desired cooking time and then Dual cook mode
by touching the "TOP GRILL"  
  and MICROWAVE keys
(led's will light on display panel).  When the START key 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
energized.
3. Relay RY3 is energized and the main supply voltage is
applied to the top heater.
4. Relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. Now the food is cooked by microwave and top grill
simultaneously.
 OPERATION SEQUENCE
R-8740M  - 8
top and bottom heater.
3. When the oven temperature reaches the selected preheat
temperature, the following operations occur;
3-1. The shut-off relays RY3 and RY4 are de-energized by the
control unit temperature circuit and thermistor, opening
the circuit to the top and bottom heating elements.
3-2. The oven will continue to function for 15 minutes, turning
the convection heating elements on and off, as needed to
maintain the selected preheat temperature. The oven will
shut-down completely after 15 minutes.
CONVECTION COOKING CONDITION (Figure O-4)
When the preheat temperature is reached, a beep signal  will
sound indicating that the holding temperature has been reached
in the oven cavity. Open the door and place the food to be cooked
in the oven. Program desired cooking time  then touch the
CONVECTION key repeatedly to set the temperature.  When
the START key is touched, the following operations occur:
1. The numbers of the digital readout start the count down to
zero.
2. The oven lamp, cooling fan motor, turntable motor and
convection motor are energized.
3. Relays RY3 and RY4 are energized (if the cavity temperature
is lower than the selected temperature) and the main supply
voltage is applied to the top and bottom heaters to return to
the selected cooking temperature.
4. Upon completion of the cooking time, the audible signal will
sound, and oven lamp, turntable motor, cooling fan motor
and convection motor are de-energized. At the end of
convection cycle, if the cavity air temperature is above
104˚C, the circuit to RY5 will be maintained (by the thermistor
circuit) to continue operation of the cooling fan motor until
temperature drops below 104˚C, at that time the relay will
be de-energized, turning off the fan motor .
GRILL COOKING CONDITION
TOP GRILL (Figure O-3a)
In this condition the food is cooked by grill heating element
energy. Programme the desired cooking time and top grill mode
by turning the mode select knob to           " TOP GRILL" and the
second rotary knob to set the time. When the START key 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
energized.
3. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
4. Now the food is cooked by the top grill heater.
GRILL COOKING CONDITION
BOTTOM GRILL (Figure O-3b)
In this condition the food is cooked by bottom grill heating
element energy.  Program the desired cooking time and bottom
grill mode by turning the mode select knob to
 
  "BOTTOM  GRILL" and the second rotary knob to set
the time.  When the START key 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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. Now the food is cooked by the bottom grill heater.
GRILL COOKING CONDITION
TOP AND BOTTOM GRILL (Figure O-3c)
In this condition the food is cooked by the top and bottom grill
heating element energy.  Program the desired cooking time
then set top+bottom grill mode by touching  
  "TOP GRILL"
and   
  "BOTTOM GRILL"keys.  (led's will light on the
display panel).
  "TOP & BOTTOM GRILL" .  When the
START key 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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
5. Now the food is cooked by the top+bottom grill heater.
DUAL COOKING CONDITION
MICROWAVE AND CONVECTION (Figure O-5a)
Program the desired cooking time and then Dual cook mode
by touching the CONVECTION  
  and MICROWAVE keys.
(led's will light on the display panel).  When the START key 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
convection motor are energized.
3. Relay RY4 is energized (if the cavity temperature is lower
than the selected temperature) and the main supply voltage
is applied to the bottom heater.
4. Relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. During operation relay RY2 will de-energize and relay RY3
will be energized and the main supply voltage is applied to
the top grill heater.  This will continue to cycle throughout
this mode.
6. Now the food is cooked by microwave and convection
energy simultaneously.
DUAL COOKING CONDITION
MICROWAVE AND TOP GRILL (Figure O-5b)
Program the desired cooking time and then Dual cook mode
by touching the "TOP GRILL"  
  and MICROWAVE keys
(led's will light on display panel).  When the START key 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
energized.
3. Relay RY3 is energized and the main supply voltage is
applied to the top heater.
4. Relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. Now the food is cooked by microwave and top grill
simultaneously.
 OPERATION SEQUENCE
R-8740M  - 8
top and bottom heater.
3. When the oven temperature reaches the selected preheat
temperature, the following operations occur;
3-1. The shut-off relays RY3 and RY4 are de-energized by the
control unit temperature circuit and thermistor, opening
the circuit to the top and bottom heating elements.
3-2. The oven will continue to function for 15 minutes, turning
the convection heating elements on and off, as needed to
maintain the selected preheat temperature. The oven will
shut-down completely after 15 minutes.
CONVECTION COOKING CONDITION (Figure O-4)
When the preheat temperature is reached, a beep signal  will
sound indicating that the holding temperature has been reached
in the oven cavity. Open the door and place the food to be cooked
in the oven. Program desired cooking time  then touch the
CONVECTION key repeatedly to set the temperature.  When
the START key is touched, the following operations occur:
1. The numbers of the digital readout start the count down to
zero.
2. The oven lamp, cooling fan motor, turntable motor and
convection motor are energized.
3. Relays RY3 and RY4 are energized (if the cavity temperature
is lower than the selected temperature) and the main supply
voltage is applied to the top and bottom heaters to return to
the selected cooking temperature.
4. Upon completion of the cooking time, the audible signal will
sound, and oven lamp, turntable motor, cooling fan motor
and convection motor are de-energized. At the end of
convection cycle, if the cavity air temperature is above
104˚C, the circuit to RY5 will be maintained (by the thermistor
circuit) to continue operation of the cooling fan motor until
temperature drops below 104˚C, at that time the relay will
be de-energized, turning off the fan motor .
GRILL COOKING CONDITION
TOP GRILL (Figure O-3a)
In this condition the food is cooked by grill heating element
energy. Programme the desired cooking time and top grill mode
by turning the mode select knob to           " TOP GRILL" and the
second rotary knob to set the time. When the START key 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
energized.
3. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
4. Now the food is cooked by the top grill heater.
GRILL COOKING CONDITION
BOTTOM GRILL (Figure O-3b)
In this condition the food is cooked by bottom grill heating
element energy.  Program the desired cooking time and bottom
grill mode by turning the mode select knob to
 
  "BOTTOM  GRILL" and the second rotary knob to set
the time.  When the START key 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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. Now the food is cooked by the bottom grill heater.
GRILL COOKING CONDITION
TOP AND BOTTOM GRILL (Figure O-3c)
In this condition the food is cooked by the top and bottom grill
heating element energy.  Program the desired cooking time
then set top+bottom grill mode by touching  
  "TOP GRILL"
and   
  "BOTTOM GRILL"keys.  (led's will light on the
display panel).
  "TOP & BOTTOM GRILL" .  When the
START key 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
energized.
3. The relay RY4 is energized and the main supply voltage is
applied to the bottom grill heater.
4. The relay RY3 is energized and the main supply voltage is
applied to the top grill heater.
5. Now the food is cooked by the top+bottom grill heater.
DUAL COOKING CONDITION
MICROWAVE AND CONVECTION (Figure O-5a)
Program the desired cooking time and then Dual cook mode
by touching the CONVECTION  
  and MICROWAVE keys.
(led's will light on the display panel).  When the START key 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
convection motor are energized.
3. Relay RY4 is energized (if the cavity temperature is lower
than the selected temperature) and the main supply voltage
is applied to the bottom heater.
4. Relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. During operation relay RY2 will de-energize and relay RY3
will be energized and the main supply voltage is applied to
the top grill heater.  This will continue to cycle throughout
this mode.
6. Now the food is cooked by microwave and convection
energy simultaneously.
DUAL COOKING CONDITION
MICROWAVE AND TOP GRILL (Figure O-5b)
Program the desired cooking time and then Dual cook mode
by touching the "TOP GRILL"  
  and MICROWAVE keys
(led's will light on display panel).  When the START key 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
energized.
3. Relay RY3 is energized and the main supply voltage is
applied to the top heater.
4. Relay RY2 is energized and the microwave energy is
generated by the magnetron.
5. Now the food is cooked by microwave and top grill
simultaneously.
 OPERATION SEQUENCE
Display

Sharp R-8740 (serv.man5) Service Manual ▷ Download

  • DOWNLOAD Sharp R-8740 (serv.man5) Service Manual ↓ Size: 450.43 KB | Pages: 2 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp R-8740 (serv.man5) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp R-8740 (serv.man5) Microwave Oven. Information contained in Sharp R-8740 (serv.man5) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.

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