R-874 (serv.man4). Schematic and pictorial diagrams, power and CPU unit circuit, PWB's — Sharp Home Appliance Service Manual (repair manual). Page 4

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R-874M - 34
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. CONVECTION TEMPERATURE SELECTED.
4. START KEY TOUCHED.
Figure O-4 Oven Schematic-Convection Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. DUAL KEY TOUCHED ONCE.
4. MICROWAVE POWER LEVEL ENTERED.
5. CONVECTION TEMPERATURE SELECTED.
6. START KEY TOUCHED.
Figure O-5(a) Oven Schematic-Dual cooking Condition (Microwave and Convection mode)
NOTE: The top heating element, bottom heating element, fan motor and convection motor will
be turned on and off according to the temperature. See "Power setting" on page 7.
NOTE: The top heating element, bottom heating element, magnetron, fan motor and
convection motor will be turned on and off according to the temperature or
microwave power level. See "Power setting" on page 7.
OL
CM
TTM
OVEN  LAMP
CONVECTION 
MOTOR
FAN MOTOR
TURNTABLE MOTOR
TOP GRILL HEATING ELEMENT 
BOTTOM HEATING ELEMENT
H.V. RECTIFIER
MAGNETRON
HIGH VOLTAGE 
TRANSFORMER
T/C TRANSFORMER
CAPACITOR
1.07 
µ
F
AC2100V
CONTROL UNIT
A9
A7
RY7
RY5
COM.
COM.
COM.
N.O.
N.O.
COM.
N.O.
N.O.
A3
E1
E3
E5
E7
A1
B2
C3
C1
A5
B1 
(SW2)STOP SWITCH
(SW1)MONITORED LATCH SWITCH
THERMISTOR
MG.
THERMAL
CUT-OUT
OVEN
THERMAL
CUT-OUT
(SW3)MONITOR 
SWITCH
4700p/ 250V
4700p/ 250V
10M/ 0.5W
NOISE SUPPRESSION COIL
680 k/ 0.5W
0.22
µ
/250V
FUSE F1 20A
FUSE F2 F8A
NOISE 
FILTER
L
N
230 - 240V ~ 50Hz
BRN/15
BLU/15
G-Y/15
EARTH
LIVE
NEUTRAL
NC.
NC.
 ASYMMETRIC
 RECTIFIER
RY6
RY1
RY2
RY3
RY4
FM
1
-
OL
CM
TTM
OVEN  LAMP
CONVECTION 
MOTOR
FAN MOTOR
TURNTABLE MOTOR
TOP GRILL HEATING ELEMENT 
BOTTOM HEATING ELEMENT
H.V. RECTIFIER
MAGNETRON
HIGH VOLTAGE 
TRANSFORMER
T/C TRANSFORMER
CAPACITOR
1.07 
µ
F
AC2100V
CONTROL UNIT
A9
A7
RY7
RY5
COM.
COM.
COM.
N.O.
N.O.
COM.
N.O.
N.O.
A3
E1
E3
E5
E7
A1
B2
C3
C1
A5
B1 
(SW2)STOP SWITCH
(SW1)MONITORED LATCH SWITCH
THERMISTOR
MG.
THERMAL
CUT-OUT
OVEN
THERMAL
CUT-OUT
(SW3)MONITOR 
SWITCH
4700p/ 250V
4700p/ 250V
10M/ 0.5W
NOISE SUPPRESSION COIL
680 k/ 0.5W
0.22
µ
/250V
FUSE F1 20A
FUSE F2 F8A
NOISE 
FILTER
L
N
230 - 240V ~ 50Hz
BRN/15
BLU/15
G-Y/15
EARTH
LIVE
NEUTRAL
NC.
NC.
 ASYMMETRIC
 RECTIFIER
RY6
RY1
RY2
RY3
RY4
FM
1
-
  SCHEMATIC DIAGRAMS
R-874 S/MANUAL
11/7/01, 10:59 am
34
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