Read Sharp R-27STMA (serv.man13) Service Manual online
R27STMA
13 – 1
R27STMA
Service Manual
CHAPTER 13.
CIRCUIT DIAGRAMS
[1] Oven Schematic
Figure O-1(a) Oven Schematic-OFF Condition right after the oven is plugged in.
Figure O-1(b) Oven Schematic-OFF Condition when the oven door is opened.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. PLUGGED IN OVEN
3. NOTHING APEARS ON DISPLAY.
1. DOOR CLOSED.
2. PLUGGED IN OVEN
3. NOTHING APEARS ON DISPLAY.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. PLUGGED IN OVEN.
2. DOOR OPENED.
3. “ . 0” APPEARS ON DISPLAY.
1. PLUGGED IN OVEN.
2. DOOR OPENED.
3. “ . 0” APPEARS ON DISPLAY.
NOTE: " " indicates components with potentials above 250V
GRN
TEMP
FUSE
A5
A7
CONTROL UNIT
OVEN
LAMP
FAN
MOTOR
ASYMMETRIC
RECTIFIER
TURN
TABLE
MOTOR
OL
FM
TTM
A3
A1
B1
B3
N.C.
N.O.
COM.
FUSE 2.5A
SECONDARY
INTERLOCK
SWITCH
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
MAGNETRON
HIGH VOLTAGE
TRANSFORMER
MONITOR
SWITCH
(RY-6)
(RY-5)
(RY-2)
LINE
CROSS
CAPACITOR
0.068uF
/
A
C
250V
LINE
BYPASS
CAPACITOR
0.0022uF
/
A
C
250V
LINE
BYPASS
CAPACITOR
0.0022uF
/
A
C
250V
FUSE
T6.3A
H.V.
CAPACITOR
0.9uF
2
100V
AC
H.V.
RECTIFIER
NOISE
SUPPRESSION
COIL
N
L
GRN
TEMP
FUSE
A5
A7
CONTROL UNIT
OVEN
LAMP
FAN
MOTOR
ASYMMETRIC
RECTIFIER
TURN
TABLE
MOTOR
OL
FM
TTM
A3
A1
B1
B3
N.C.
N.O.
COM.
FUSE 2.5A
SECONDARY
INTERLOCK
SWITCH
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
MAGNETRON
HIGH VOLTAGE
TRANSFORMER
MONITOR
SWITCH
(RY-6)
(RY-5)
(RY-2)
LINE
CROSS
CAPACITOR
0.068uF
/
A
C
250V
LINE
BYPASS
CAPACITOR
0.0022uF
/
A
C
250V
LINE
BYPASS
CAPACITOR
0.0022uF
/
A
C
250V
FUSE
T6.3A
H.V.
CAPACITOR
0.9uF
2100V
AC
H.V.
RECTIFIER
NOISE
SUPPRESSION
COIL
N
L
R27STMA
13 – 2
Figure O-1(C) Oven Schematic-OFF Condition when the oven door is closed.
Figure O-2 Oven Schematic-ON Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. PLUGGED IN OVEN.
3. DOOR OPENED AND CLOSED.
4. “ . 0” APPEARS ON DISPLAY.
1. DOOR CLOSED.
2. PLUGGED IN OVEN.
3. DOOR OPENED AND CLOSED.
4. “ . 0” APPEARS ON DISPLAY.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. START BUTTON PRESSED.
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. START BUTTON PRESSED.
NOTE: "
" indicates components with potentials above 250V
GRN
TEMP
FUSE
A5
A7
CONTROL UNIT
OVEN
LAMP
FAN
MOTOR
ASYMMETRIC
RECTIFIER
TURN
TABLE
MOTOR
OL
FM
TTM
A3
A1
B1
B3
N.C.
N.O.
COM.
FUSE 2.5A
SECONDARY
INTERLOCK
SWITCH
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
MAGNETRON
HIGH VOLTAGE
TRANSFORMER
MONITOR
SWITCH
(RY-6)
(RY-5)
(RY-2)
LINE
CROSS
CAPACITOR
0.068uF
/
A
C
250V
LINE
BYPASS
CAPACITOR
0.0022uF
/
A
C
250V
LINE
BYPASS
CAPACITOR
0.0022uF
/
A
C
250V
FUSE
T6.3A
H.V.
CAPACITOR
0.9uF
2100V
AC
H.V.
RECTIFIER
NOISE
SUPPRESSION
COIL
N
L
GRN
TEMP
FUSE
A5
A7
CONTROL UNIT
OVEN
LAMP
FAN
MOTOR
ASYMMETRIC
RECTIFIER
TURN
TABLE
MOTOR
OL
FM
TTM
A3
A1
B1
B3
N.C.
N.O.
COM.
FUSE 2.5A
SECONDARY
INTERLOCK
SWITCH
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
MAGNETRON
HIGH VOLTAGE
TRANSFORMER
MONITOR
SWITCH
(RY-6)
(RY-5)
(RY-2)
LINE
CROSS
CAPACITOR
0.068uF
/
A
C
250V
LINE
BYPASS
CAPACITOR
0.0022uF
/
A
C
250V
LINE
BYPASS
CAPACITOR
0.0022uF
/
A
C
250V
FUSE
T6.3A
H.V.
CAPACITOR
0.9uF
2
100V
AC
H.V.
RECTIFIER
NOISE
SUPPRESSION
COIL
N
L
R27STMA
13 – 3
[2] Pictorial Diagram (Figure S-1)
Figure S-1. Pictorial Diagram
WHT
WHT
MONITOR
SWITCH
SECONDARY
INTERLOCK
SWITCH
COM
COM
RED
N.C.
N.O.
N.C.
GRY
GRN
GRN
BLU
TEMPERATURE
FUSE
(OVEN)
DOOR
SENSING
SWITCH
BLK
ORG
GRN
CONTROL
PANEL
(POWER
UNIT)
(SWITCH
UNIT)
GRY
GRY
CN-B
1
3
CN-A
CN-A
71
CN-G
CN-H
WH-A
WH-B
RY2
ORG
ORG
BLK
RED
CN-B
3
2
1
GRN
GRY
7
BLK
5
ORG
3
WHT
1
2
4
6
GRY
COM
GRY
WHT
HIGH
VOLTAGE
CAPACITOR
H.V.
RECTIFIER
ASYMMETRIC
RECTIFIER
HIGH
VOLTAGE
COMPONENTS
MAGNETRON
TURNTABLE
MOTOR
HIGH
VOLTAGE
TRANSFORMER
BLK
RED
WHT
RED
WHT
WHT
WHT
ORG
F1:
FUSE
LIVE
NEUTRAL
FAN
MOTOR
BLU
WHT
RED
OVEN
LAMP
RED
BRN
BLU
L
N
WHT
RED
Power
S
upply
Cord
Oven
C
avity
Back
Plate
Screw
Noise
Filter
G / Y
WHT
ORG
R27STMA
13 – 4
[3] Control Unit Circuit (Figure S-2)
Figure S-2. Control Unit Circuit
B3
RY6
Q21
RN1401
D20
SP1
C2
1000uF/25V
+
-
ZD3
C5
0.1u
F
50
V
R8
2SA1162
Q3
R9
10K
Q20
C20
0.1uF
16V
R41
10K
R40
4.7K
MICRO
DOOR
SW.
VRS1
470V
T1
D3
D4
D1
D2
D1~D4
1N4002X4
B1
DOOR
-5V
INT
C40
R1
CN-B
0.01uF
25V
<
P
OWER
UNIT
>
Q26
C1
0.1uF/50V
Q2
R7
10K
NOTE:
C2
C1
C1
C3
LCD
<
LSI
UNIT
>
R72
(R73)
C7
R74
(R75)
(C60)
(C61)
(C62)
(C63)
0.1uF/
16V
1K
R11
4.7K
CF1
4MHz
ESDA
ESCLK
ESPGMB
RESET
VPP
VCC
VSS
G2
H7(G3)
G4
65
49
P54
AN5
AN4
AN4
P60
P53
AVSS
SEG21
P46
P47
VREF
P55
P56
P57
AN2
P41
P40
P40
OSCSEL
RESET
P62
P61
P61
VSS
AN3
XIN
XOUT
VCC
VCC
VCC
18
1
17
32
50
P51
INT0
SEG23
VL3
COM0
COM1
COM2
COM3
P30
P31
P32
P33
P34
P35
T2OUT
SEG22
33
P37
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
P52
100K
x3
*
C
hecker
land
7
point
(f
or
Q'z
R
OM
writing
)
C4
0.01uF
25V
C6
0.01uF/
25V
IF
NOT
SPECIFIED
H3
H4
H5
(G9)
H6
(G7)
R67
R66
R65
(R64)
R63
R62
R61
(R60)
10Kx8
R70
(R71)
(R69)
R68
10K
x3
(Q25)
R3
ZD1
C3
+
-
Q1
C21
+
-
10uF/35V
R30
3.3K
(Q23)
D22
RY2
A5
1SS133
or
1SS270A
(G5)
(R10)
Q2
2
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
(S13)
(S14)
M
(BoH)
DB
BZ
GND
R76
1M
Base
Pattern:
VSS(-5V)
F1
2.5A
SE
BL
HZ5C2
R2
(COM)
SE
PWM
(C1)
(C2)
INVERTER
(Q24)
D27
(Q28)
Q30
R6
(ZD2)
Q4
R50
R51
C51
C52
(R20)
10uF/35V
1K
100K
100K
0.01uF
/25V
0.01uF
/25V
1/10W
+5%,-5%
DTA143EAK
or
KRA101S
or
RN2401
(ToH)
Q27
AB
C
SW100
C-1
C-2
C-3
B3
B2
B1
A7
A6
A5
A4
A3
(G8)
(G10)
<S
WU
N
IT>
AC230V~240V
50HZ
A1
AC
(C100)
(C101)
(R100)
(R101)
(c)
(b)
(a)
A2
A1
G6
H2
H1
CN-H
B
7B-PH-K-S(LF)(SN)
WH-A
7pin
HARNESS
WH-B
4pin
HARNESS
WH-C
3pin
WIRE
HARNESS
D26
OL
TTM
FM
A3
RY5
OL
TTM
FM
()
NOT
INSERTED
PARTS
1/2W
510
HZ12B-1
390
RN1401
Q31
A7
AC
LD4
LD3
LD2
LD1
R5
CN-A
J2
J3
(d)
(d)
J5
(H8(G1))
(CN-
C)
2SB1238
(B4)
(LD5)
1/4W
200
DU12D1-1P(M)-R-S
CN-G
B03B-XASK-1(LF)(SN)
FTR-F3AA012E
FTR-F3AA012E
UDZS4.3B
IC-1
(a)
(b)
CHICKEN
QUARTERS
ROAST
B
EEF/
LAMB
START
AUTO
MINUTE
AUTO
COOK
MEAT
JOINT
ROAST
POULITRY
POWER
LEVEL
ROAST
POAK
STOP
CEAR
WHOLE
POULTRY
(c)
SW1
S
W2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
