Sharp R-952M Service Manual ▷ View online
R-952M - 17
MICROWAVE MEASUREMENT
After any repair, the microwave oven must be checked for
microwave leakage to ensure continued safe operation.
BS EN 60335-2-25 specifies that the maximum permitted
leakage with a load of 275 ml is 50 W/m
microwave leakage to ensure continued safe operation.
BS EN 60335-2-25 specifies that the maximum permitted
leakage with a load of 275 ml is 50 W/m
2
(equivalent to 5
mW/cm
2)
at a distance of 5 cm from the oven.
PREPARATION
The following items are required to carry out this test:-
1. A low form of 600 ml beaker made from an electrically
1. A low form of 600 ml beaker made from an electrically
non-conductive material, such as glass or plastic, with
an inside diameter of approximately 8.5 cm. This must
contain 275
an inside diameter of approximately 8.5 cm. This must
contain 275
±
15 ml of water, at an initial temperature
of 20
±
2˚C.
2. A leakage detector which has been calibrated within
the preceding 12 months to a stand whose accuracy
can be traced to National Physical Laboratory
Standards.
can be traced to National Physical Laboratory
Standards.
Recommended instruments are:
Apollo "XI"
Celtec "A100"
Celtec "A100"
Before commencing the test, check that the leakage
detector is functioning and adjusted according to the
manufacturer's instructions, and any spacers are fitted to
ensure that measurement is taken 5cm from the surface of
the oven.
detector is functioning and adjusted according to the
manufacturer's instructions, and any spacers are fitted to
ensure that measurement is taken 5cm from the surface of
the oven.
PROCEDURE
1. Place the beaker containing the water load in the oven
cavity at the centre of the turntable. The placing of this
standard load in the oven is important, not only to
protect the oven, but also to ensure that any leakage it
is not disguised by too large a load absorbing energy.
standard load in the oven is important, not only to
protect the oven, but also to ensure that any leakage it
is not disguised by too large a load absorbing energy.
2. Close the oven door, and with the power level set to
FULL, turn the oven ON with the timer set for a few
minutes operation. Should the water begin to boil
before the test has been completed, it should be
replaced.
minutes operation. Should the water begin to boil
before the test has been completed, it should be
replaced.
3. As shown in the diagram below, move the probe slowly
(not faster than 2.5 cm/sec.);-
a) around the edge of the door following the gap
b) across the face of the door
c) across any vents in the oven's sides, rear or top
b) across the face of the door
c) across any vents in the oven's sides, rear or top
Dotted line indicates the path taken by the leakage detector.
Whilst the maximum leakage permitted in BS EN 60335-2-25 is 50 W/m
2
(equivalent to 5 mW/cm
2
), it is not normal to
detect any significant leakage, and therefore any detected leakage should be investigated.
R-952M - 18
Figure 1 Schematic Diagram
*
INDICATES COMPONENTSWITH POTENTIALSABOVE 250V
C1
C3
RY6
RY7
RY8
FM
CM
DM
T
OL
T M
D1
D3
A1
230-240V 50Hz
STOP
no
com
THERM-
ISTOR
DAMPER
SWITCH
SWITCH
com
nc
680K/0.5W
4700p/250V
4700p/250V
10M/0.5W
L
N
0.22 /250V
G-Y/15
/15
/15
FILTER
NOISE
NOISE SUPPRESSION COIL
LIVE
NEUTRAL
BRN
BLU
EARTH
FUSE 15A
N.O
FUSE
F8A
F8A
B1
B2
E1
E3
UNIT
CONTROL
RY1
R
Y2
RY3
RY4
RY5
A3
LATCH
MONITORED
SWITCH
nc
BLK
/24
KIF
KIF
BRN
/20
KIF
CONV.
CUT-OUT
THERMAL
COM
COM
WHT /22
ORG /24
/24
THERMAL
CUT-OUT
MAG
N.O
BRN
/18
/18
KIF
WHT /24
RED /24
/24
/20
BLK
GRY /24
RED
WHT /18 KIF
BLK /24
GRY
BLU
/20
BRN /24
BRN
/16
WHT
/22
WHT /20
CONVECTION HEATER
WHT /22 KIF
SWITCH
MONITOR
GRILL HEATER
BLU
/22
KIF
KIF
BLU /18 KIF
RED /18 KIF
GRY /20
*
POWER
*
CAPACITOR
AC2100V
*
MAGNETRON
TRANSFORMER
*
ASYMMETRIC
RECTIFIER
*
H.V. RECTIFIER
1.16 F
THERMAL
CUT-OUT
CUT-OUT
GRILL
HV: HIGH VOLTAGE WIRE
BLK: BLACK GRN: GREEN
ORG: ORANGE GRY: GREY
BRN: BROWN BLU: BLUE
RED: RED WHT: WHT
WIRE COLOUR CODE & SYMBOL
GRY
/18
KIF
/16
RED /16
no
BLU
/16
/16
KIF
WHT /16
/24
RED
RED
RED
/22
COM
N.O
COM
N.O
FAN
CUT-OUT
THERMAL
T/C TRANSFORMER
/** : WIRE THICKNESS = AWG **
GRY
A7
E5
E7
B4
B3
D5
BLU /24
R-952M
SW2
SW1
SW3
CIRCUIT DIAGRAMS
R-952M - 19
C1
C3
E5
E7
B4
B3
RY6
RY7
RY8
FM
CM
DM
T
OL
TM
THERMAL
CUT-OUT
CUT-OUT
CONV.
D1
D3
A1
SCHEMATIC
DIAGRAM
DOOR CLOSED
COOK OFF CONDITION
1. AC CORD CONNECTION
BRN : BROWN
BLU : BLUE
G-Y : GREEN AND
YELLOW STRIPE
2
MIN.
WITHOUT NOTICE
CIRCUIT SUBJECT TO CHANGE
OF 1.5mm
/15 : SECTIONAL AREA
230-240V 50Hz
MODEL: R-952M
1.16 F
STOP
CONVECTION HEATER
GRILL HEATER
MAG
CUT-OUT
THERMAL
no
com
MONITOR
SWITCH
SWITCH
GRILL
THERM-
ISTOR
DAMPER
SWITCH
SWITCH
com
nc
680K/0.5W
4700p/250V
4700p/250V
10M/0.5W
L
N
0.22 /250V
G-Y/15
/15
/15
FILTER
NOISE
NOISE SUPPRESSION COIL
LIVE
NEUTRAL
*
H.V. RECTIFIER
RECTIFIER
*
ASYMMETRIC
BRN
BLU
TRANSFORMER
*
POWER
*
MAGNETRON
EARTH
FUSE 15A
AC2100V
*
CAPACITOR
CUT-OUT
THERMAL
COM
N.O
THERMAL
CUT-OUT
CUT-OUT
FAN
FUSE
F8A
F8A
COM
COM
N.O
COM
N.O
N.O
B1
B2
E1
E3
T/C TRANSFORMER
UNIT
CONTROL
RY1
RY2
RY3
RY4
RY5
A3
LATCH
MONITORED
SWITCH
nc
D5
A7
SW1
SW2
SW3
Figure 2 Schematic Diagram
*
INDICATES COMPONENTSWITH POTENTIALSABOVE 250V
CIRCUIT DIAGRAMS
R-952M - 20
Figure S-2. Control Panel Circuit
CIRCUIT DIAGRAMS
CONT
...
+
–
CN1-3
CN1-10
CN1-5
CN1-6
CN1-9
CN1-11
CN2-4
CN2-3
CN1-8
CN1-7
CN1-15
CN1-13
CN1-12
CN1-1
CN1-14
CN1-2
CN2-1
CN1-4
G 8
SAUSAGE/
BURGER
FRESH
FISH
FRESH
VEG.
BAKED
POTATOES
ROAST
POTATOES
CHIKEN
PORTIONS
OVEN
CHIPS
YORKSHIRE
PUDDING
AUTO
DEFROST
RICE /
PASTA
AUTO
COOK
STOP /
CLEAR
MORE
info
Kg / L b
TIMER
10 sec.
g
• oz
Kg
• Lb
GRILL
CONVECTION
(
˚C )
1 min.
10 min.
MICROWAVE
POWER LEVEL
DUAL
CONVECTION/
GRILL
START
CLOCK
AUTO
MINUTE
AUTO START
G 7
G
6
G
5
G
4
G
3
G
2
G
1
G12G11
G10G
9
D5
D6
LD1
LD2
LD3
LD4
LD5
LD6
LD7
LD8
LD9
LD10
R4 22
R6 620
: IF NOT SPECIFIED, 1/10W
±
5%
: IF NOT SPECIFIED, 1SS355
: IF NOT SPECIFIED, 0.01
µ
F / 50V
R5 4.7k
R15 4.7k
C10 47
µ
/16v
C11 0.1
µ
/50v
C14
C12
0.1
µ
/50v
C21
0.1
µ
/50v
C13
0.1
µ
/50v
R10 1k
R12
15k
R13
15k
R14
15k
ZD10
UDZ4.3B
R11 4.7k
Q2
2SA1037K
Q11
DTA143EKA
Q27
DTA143EKA
Q25
DTA143EKA
Q24
DTA143EKA
Q23
DTA143EKA
Q22
DTA123JKA
GND
VR
VC
INT
BUZZER
POWER
DAMPER
LIQUID CRYSTAL DISPLAY
FAN
CONVECTION
FAN
CONVECTION
HEATER
STOP SWITCH
OVEN LAMP
TURNTABLE
MOTOR
HIGH
VOLTAGE
TRANSFORMER
DAMPER
SWITCH
OVEN
THERMISTOR
NC
GRILL
HEATER
Q21
DTA123JKA
Q20
DTA123JKA
R85 15k
R30 4.7k
R81 120F
R82 3.9kF
R80 160kF
R73 100k
R72 100k
R74 100k
R75 100k
C60
330p/50v
C61
330p/50v
C62
330p/50v
C63
330p/50v
R83 15k
C80
C30
R84
4.7k
R31 15k
C83
D22
D23
D30
D
Q28
DTA143EKA
Q40
DTA143EKA
A
(J14) 4.7k
(J15) 4.7k
(J12) 4.7k
(J13) 4.7k
(J10)
(J11)
R68 15k
R55 4.7k
IC-1
IZA963DR
(J17)
(J16)
R60 15k
R61 15k
R62 15k
R63 15k
R64 15k
R65 15k
R66 15k
R67 15k
R56
1M
AB
D
CF1 4MHz
R69 15k
R70 15k
R71 15k
B
Q10
2SA1037AK
SEG10
C 1
VL1
AN7
AN6
AN5
5
10
15
20
25
55
60
65
70
75
51
1
80
30
AN4
AN3
AN2
AN1
AN0
P57
P56
P55
P54
P53
P52
P51
P50
P47
P46
P45
P44
INT0
P41
P40
P77
P76
P75
P72
P71
P70
RESET
35
45
85
90
95
50
P81
P80
XIN
XOUT
VSS
P27
P26
P25
P24
P23
P22
P21
P20
P17
P16
P73
C 2
VL2
VL3
COM0
COM1
COM2
COM3
AVSS
VREF
SEG39
SEG38
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
N C
N C
N C
N C
N C
N C
N C
COM3
COM2
COM1
N C
N C
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
VCC
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
P74
INT1
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
LESS
nfo
LBS
KG
OZ
PCS
%
˚C
COOK
SENSOR
DEFROST
AUTO
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