DOWNLOAD Sharp R-770AM Service Manual ↓ Size: 537.34 KB | Pages: 27 in PDF or view online for FREE

Model
R-770AM
Pages
27
Size
537.34 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven
File
r-770am.pdf
Date
PREV: Sharp R-765M (serv.man29) User Manual / Operation Manual

Sharp R-770AM Service Manual ▷ View online

16
770AM -
SCHEMATIC DIAGRAM
NOTE: 
Indicates components with potential above 250 V.
230 / 240V ~ 50Hz
BLU/15
BRN/15
NEUTRAL
0.22
µ
 / 250V
LIVE
EARTH
FUSE 15A
NOISE SUPPRESSION COIL
NEUTRAL
NEUTRAL
4700  /250V
L
N
NOISE
FILTER
NEUTRAL
OVEN
THERMAL
CUT-OUT
150/130˚C
MG
THERMAL
CUT-OUT
125/95˚C
FUSE
F8A
RY
5
RY
4
RY
3
RY
2
RY
1
THERMI-
STOR
CONTROL
UNIT
COM
N.O
COM
N.O
COM
N.O
STOP
SWITCH
B3
B4
B4
B1
A1
OL
FM
TTM
A5
A7
MONITORED
LATCH 
SWITCH
BOTTOM HEATER
GRILL HEATER (TOP)
MONITOR 
SWITCH
NC
* CAPACITOR
  1.16 
µ
F
  AC2100V
POWER
TRANSFORMER
* ASYMMETRIC
  RECTIFIER
MAGNETRON*
* HV RECTIFIER
 *
A3
17
770AM -
6
4
5
1
2
3
6
4
5
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-1. Pictrorial Diagram
PICTORIAL DIAGRAM
BLU
WHT
BLK
WHT
RED
RED
RED
ORG
THERMAL 
CUT-OUT
(OVEN)
OVEN LAMP 
MONITOR 
RESISTOR
THERMAL
CUT-OUT
125
°
C(MG)
FAN MOTOR
ORG
GRY
BRN
WHT
HIGH VOLTAGE COMPONENTS
H.V.WIRE B
MAGNETRON
H.V.WIRE A
H.V. 
CAPACITOR
H.V.
RECTIFIER
ASYMMETRIC RECTIFIER
 HIGH VOLTAGE
 TRANSFORMER
G
–
Y
BLU
BRN
NOISE FILTER
F8A
POWER SUPPLY CORD
BLU
2
4
GRY
5
3
5
7
1
COM
GRY
WHT
WHT
WHT
BRN
WHT
N.C.
N.O.
NO
COM
STOP SWITCH
NO
COM
GRILL HEATING 
ELEMENT
BOTTOM HEATING 
ELEMENT
RED
ORG
ORG
ORG
GRY
WHT
WHT
WHT
7
  
1
4
1
COM
NO
CN-B
T1
RY3
RY2
RY4
GRN
GRN
GRN
CONTROL PANEL
BRN
RED
BLU
ORG
WHT
TURNTABLE
MOTOR
MONITOR
SWITCH
MONITORED
LATCH
SWITCH
WHT
WHT
BRN
RED
BLK
2
4
3
1
RED
RED
RED
GRN
CN-A
CN-B
CN-A
RY5
CN-G
BRN
BLK
BLK
B
L
U
R
E
D
B
R
N
RED
ORG
NEUTRAL
THERMISTOR
N
L
EARTH
15A
LIVE
O
R
G
W
H
T
R
E
D
W
H
T
WHT
RY1
18
770AM -
6
4
5
1
2
3
6
4
5
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-2. Control Panel Circuit
+
–
+
–
+
–
+
–
A1
VRS1
a
48
R1 510 1w
R50 4.7k
R51 4.7k
IC1  IZA799DR
C50
C51
R52 100k
R53 100k
SW1
DOOR SWITCH
THERMISTOR
CONTROL UNIT
KEY UNIT
LIQUID CRYSTAL DISPLAY 
C30
C80
R31 4.7k
R83 15k
R2 510 1w
Q1
2SA933S
Q4  
2SB1238 
Q2
KRA101M
Q20
KRA101M
Q22 KRC243M
Q21 KRA101M
Q23
KRA101M
Q40
KRA101M
Q24
KRA101M
AC230/240 V
50Hz
LOWER
HEATER
UPPER
HEATER
HIGH
VOLTAGE
TRANSFORMER
NOTE:
IF NOT SPECIFIED  1/4w 
±
 5% 
IF NOT SPECIFIED  1SS270A 
IF NOT SPECIFIED  0.01
µ
F/16v 
TURNTABLE
MOTOR
OVEN LAMP
FAN MOTOR
Q25
KRA101M
D1:S1NB10
RY5
RY1
RY4
RY3
(J10)
(J11)
(J12) 
RY2
6
1
c
d
b
(J1)
(J13)
(J2)
(J4)
(J6)
(J8)
(J3)
(J5)
(J7)
(J9)
T1
10G471K
D20
D21
D22
D23
D24
D25
D30 
C1 0.1
µ
/50v 
C2 470
µ
/50v 
C20 0.1
µ
/50v 
C21
 
10
µ
/35v 
C6 10
µ
/35v 
C7
0.1
µ
/50v 
C3 
C4
SP40
C5
0.1
µ
/50v 
R3 1k 
R4 4.7k 
R40 3.3k 
R30 15k 
R81 
R82
12kF
R60 15k 
R61 15k 
R62 15k 
R63 15k 
CF1 
4MHz 
R64 100k 
R65 100k 
R66 100k 
R67 100k 
R68 15k 
R69 15k 
R70 15k 
R10 16 
WH-A
D2 D3 
R71 15k 
R72 15k 
R11 3.3k 
LD1 LD2  LD3 LD4 LD5 
R5 4.7k 
R6 15k 
R8 15k 
18
C2
VL2
VL3
COM0
COM1
COM2
COM3
AVSS
VREF
VCC
SEG2
SEG3
SEG4
P73
P72
P71
P70
RESET
XCIN
35
40
45
85
90
95
50
XCOUT
XIN
XOUT
VSS
P27
P26
P25
P24
P23
P22
P21
P20
P17
P16
SEG5
SEG6
SEG7
SEG8
SEG9
SEG1 
SEG0
SEG11
SEG10
C1
VL1
AN7
AN6
AN5
5
10
15
20
25
55
60
65
70
75
80
30
AN4
AN3
AN2
AN1
AN0
P57
P56
P55
CNTRO
P53
P52
P51
P50
P47
P46
P45
P44
P41
P40
P77
P76
P75
P74
INT1
INT0
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG24
19
20
21
17 
16 
15 
14 
13 
12 
22 
23 
11 
24 
25 
26 
27 
28 
29 
30 
31 
32 
33 
34
10
9 
8 
7 
6 
5 
4 
3 
2 
1
R7 15k 
ZD1
HZ4C3 
A3
A7
A5
NO
NO
B1
A
G11
G 2
G 6
G
 1
G 7
G10
G5.9
G3.8
G4.12
BC
B2
B3
B4
NO
COM
COM
COM
(   )
GRILL
OVEN
(C
˚)
AUTO
COOK
DUAL
GRILL
AUTO
DEFROST
STOP/
CLEAR
AUTO
START/
CLOCK
START/
AUTO
MINUTE
CONVENI
-ENCE
FOODS
MICROW.
POWER
LEVEL
Kg / Lb
TIMER
PIZZA
(   )
(   )
MICRO
AUTO
COOK
K
g
nfo
%
Oz
Lbs
(   )
CONTROL PANEL CIRCUIT
19
770AM -
6
4
5
1
2
3
6
4
5
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-3. Printed Wiring Board
0
LD1
WH-A
2
3
4
CF1
R82
R5
R3
R63
R64
R53
R52
R11
R10
R62
R81
R30
R31
R61
R60
R83
R72
R71
R70
R69
R68
D3
D2
R65
R66
R67
IC1
9
8
12
13
14
15
21
(J1)
C
B
A
R20
R21
Q3
B
E
ZD2
D23
18
C50
C51
Q40
Q23
Q24
Q25
Q22
24
25
10
11
C6
C5
C30
C80
C4
R4
Q1
B
B
B
B
B
B
E
E
E
E
E
E
D30
D25
C2
ZD1
5
7
6
C7
C3
C20
E
E
E
E
B
B
B
B
Q2
Q21
Q4
(J8)
(J9)
(J7)
(J5)
(J3)
R7
CN - G
CN -A
CN - B
(J6)
(J4)
(J2)
R8
R2
R80
R40
R6
20
22
19
16
SP40
D1
C1
C21
Q20
D20
RY5
RY1
R51
R50
R9
(J12)
SW1
RY4
RY3
RY2
D21
D22
D24
T1
VRS1
R1
23
17
1
,F
LD2
17
18
1
1
4
12
1
12
4
6
8
7
50
30
1
10
0
80
34
1
LD3
LD4
LD5
PICTORIAL DIAGRAM
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