DOWNLOAD Sharp R-874 (serv.man4) Service Manual ↓ Size: 613.1 KB | Pages: 9 in PDF or view online for FREE

Model
R-874 (serv.man4)
Pages
9
Size
613.1 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Schematic and pictorial diagrams, power and CPU unit circuit, PWB's
File
r-874-sm4.pdf
Date
PREV: Sharp R-874 (serv.man3) Service Manual

Sharp R-874 (serv.man4) Service Manual ▷ View online

R-874M - 33
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. TOP & BOTTOM GRILL MODE SELECTED.
4. START KEY TOUCHED.
Figure O-3(c) Oven Schematic-Grill cooking Condition (TOP AND BOTTOM GRILL mode)
Figure O-3(b) Oven Schematic-Grill cooking Condition (BOTTOM GRILL mode)
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. BOTTOM GRILL MODE SELECTED.
4. START KEY TOUCHED.
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
33
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
R-874M - 35
Figure O-5(c) Oven Schematic-Dual cooking Condition (Microwave and Buttom Grill mode)
Figure O-5(b) Oven Schematic-Dual cooking Condition (Microwave and Top Grill mode)
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. DUAL KEY TOUCHED TWICE.
4. MICROWAVE POWER LEVEL ENTERED.
5. START KEY TOUCHED.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME ENTERED.
3. DUAL KEY TOUCHED THREE TIMES.
4. MICROWAVE POWER LEVEL ENTERED.
5. START KEY TOUCHED.
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
35
R-874M - 36
Figure S-1. Pictrorial Diagram
BLU
WHT
BLK
WHT
OVEN THERMAL 
CUT-OUT
MG. THERMAL
 CUT-OUT
OVEN LAMP 
BLU
BLK
BLU
1
BRN
2
3
ORG
4
5
GRY
6
7
WHT
8
9
BLU
COM
GRY
WHT
BLU
GRY
GRY
BLU
N.C.
NC
COM
(SW2)STOP 
SWITCH
NO
COM
TOP GRILL 
HEATING ELEMENT
BOTTOM 
HEATING 
ELEMENT
WHT
RED
WHT
BRN
BLU
GRN
GRN
GRN
BLU
TURNTABLE
MOTOR
T/C TRANSFORMER
(SW3)MONITOR
SWITCH
(SW1)MONITORED
LATCH 
SWITCH
ORG
ORG
BLU
WHT
BRN
BLK
RED
ORG
RED
BLK
BLU
ORG
BLK
BLU
WHT
CN-A
1
CN-B
2
RED
GRN
RED
WHT
GRY
ORG
BLK
NOISE FILTER
L
TP
F 8 A
TL
RED
20 A
WHT
N
ORG
ORG
WHT
1
BLU
2
3
BRN
4
5
ORG
6
7
RED
FAN 
MOTOR
CONVECTION
MOTOR
GRY
WHT
HIGH VOLTAGE COMPONENTS
G
–
Y
POWER SUPPLY CORD
NEUTRAL
LIVE
EARTH
THERMISTOR
CN-B
1
11
2
3
2
1
SP1
RY2
RY4
RY3
CONTROL PANEL
CN-A
CN-E
RY5
RY7
1
1
7
9
CN-C
CN-E
WH-1
CN-1
IC-1
CN-G
RY1
RY6
2
3
1
BLK
BLK
CN-C
MAGNETRON
H.V.WIRE B
H.V.WIRE A
H.V. 
CAPACITOR
H.V.
RECTIFIER
ASYMMETRIC RECTIFIER
 HIGH VOLTAGE
 TRANSFORMER
RED
BLU
RED
BLK
RED
BLK
BLK
WHT
 
 PICTURIAL DIAGRAM
R-874 S/MANUAL
11/7/01, 10:59 am
36
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  • DOWNLOAD Sharp R-874 (serv.man4) Service Manual ↓ Size: 613.1 KB | Pages: 9 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp R-874 (serv.man4) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp R-874 (serv.man4) Microwave Oven. Information contained in Sharp R-874 (serv.man4) 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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