Sharp R-23AM Service Manual ▷ View online
R-23AM
27
MICROWAVE MEASUREMENT
AAfter any repair, the microwave oven must be checked
for microwave leakage to ensure continued safe opera-
tion. BS EN 60335-2-25 specifies that the maximum
permitted leakage with a load of 275 ml is 50 W/m
for microwave leakage to ensure continued safe opera-
tion. 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 Stand-
ards.
can be traced to National Physical Laboratory Stand-
ards.
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.
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-23AM
28
SCHEMATIC
NOTE: CONDITION OF OVEN
1. POWER SUPPLY CONNECTED AND/OR 1MINUTE
1. POWER SUPPLY CONNECTED AND/OR 1MINUTE
AFTER DOOR CLOSED OR COOK OFF.
2. . 0 APPEAR ON DISPLAY.
NOTE:
Indicates components with potential above 250 V.
Figure O-1 Oven Schematic-OFF Condition
Figure O-2 Oven Schematic-IDLE Condition (Door opened condition)
SCHEMATIC
NOTE: CONDITION OF OVEN
1. FOR 1MINUTE AFTER DOOR CLOSED.
2. . 0 APPEAR ON DISPLAY.
1. FOR 1MINUTE AFTER DOOR CLOSED.
2. . 0 APPEAR ON DISPLAY.
NOTE:
Indicates components with potential above 250 V.
SW5:
STOP
SWITCH
STOP
SWITCH
TH3:
EXHAUST
THERMISTOR
EXHAUST
THERMISTOR
TH1:
MAGNETRON
THERMISTOR
(Upper)
MAGNETRON
THERMISTOR
(Upper)
TH2:
MAGNETRON
THERMISTOR (Lower)
MAGNETRON
THERMISTOR (Lower)
CN-A
CN-A
F3 : WEAK POINT A017
BLU
NEUTRAL
LIVE
GRN/YLW
BRN
NOISE FILTER
SW1:
INTERLOCK SWITCH
INTERLOCK SWITCH
SW3:
MONITOR
SWITCH
SW4: MONITOR SWITCH
NOISE SUPPRESSION COIL
DISCHARGE RESISTOR 680 kΩ 1/2W
DISCHARGE RESISTOR 10 MΩ 1/2W
LINE CROSS CAPACITOR 0.22µF/ AC250V
LINE BYPASS CAPACITOR
10000 pF/ AC250V
LINE BYPASS CAPACITOR
10000 pF/ AC250V
T3:
TOUCH CONTROL
TRANSFORMER
FUSE
2.5A
F2: FUSE F10A
TF1: TEMP. FUSE 150°C
(Upper Mag.)
TF3: EXHAUST
TEMP. FUSE
120°C
TF1:
TEMP. FUSE 150°C
(Lower Mag.)
TEMP. FUSE 150°C
(Lower Mag.)
CONTROL
UNIT
T1: HIGH VOLTAGE
TRANSFORMER
(Front)
230 - 240V~50Hz
H. V. RECTIFIER
C1: H.V. CAPACITOR
0.94µF/ AC2300V
C2: H.V. CAPACITOR
0.94µF/ AC2300V
MG1: MAGNETRON (Upper)
F1: FUSE F10A
OVEN LAMP
BLOWER
MOTOR
ANTENNA
MOTOR
SM
SM
BM
H. V. RECTIFIER
MG2: MAGNETRON (Lower)
T2: HIGH VOLTAGE
TRANSFORMER
(Rear)
OL
RY1
EARTH
F4:
H.V.FUSE
0.80 A
H.V.FUSE
0.80 A
F5:
H.V.FUSE
0.80 A
H.V.FUSE
0.80 A
L
N
1
3
6
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
RY4:
COOK RELAY
RY3:
COOK RELAY
SW2:
INTERLOCK SWITCH
INTERLOCK SWITCH
SW2:
INTERLOCK SWITCH
INTERLOCK SWITCH
SW5:
STOP
SWITCH
STOP
SWITCH
CN-A
CN-A
F3 : WEAK POINT A017
BLU
NEUTRAL
LIVE
GRN/YLW
BRN
NOISE FILTER
SW1:
INTERLOCK SWITCH
INTERLOCK SWITCH
SW3:
MONITOR
SWITCH
SW4: MONITOR SWITCH
NOISE SUPPRESSION COIL
DISCHARGE RESISTOR 680 kΩ 1/2W
DISCHARGE RESISTOR 10 MΩ 1/2W
LINE CROSS CAPACITOR 0.22µ
F/ AC250V
LINE BYPASS CAPACITOR
10000 pF/ AC250V
LINE BYPASS CAPACITOR
10000 pF/ AC250V
T3:
TOUCH CONTROL
TRANSFORMER
FUSE
2.5A
F2: FUSE F10A
TF1: TEMP. FUSE 150°C
(Upper Mag.)
TF3: EXHAUST
TEMP. FUSE
120°C
TF1:
TEMP. FUSE 150°C
(Lower Mag.)
TEMP. FUSE 150°C
(Lower Mag.)
CONTROL
UNIT
230 - 240V~50Hz
H. V. RECTIFIER
C1: H.V. CAPACITOR
0.94µF/ AC2300V
C2: H.V. CAPACITOR
0.94µF/ AC2300V
MG1: MAGNETRON (Upper)
F1: FUSE F10A
H. V. RECTIFIER
MG2: MAGNETRON (Lower)
RY1
EARTH
F4:
H.V.FUSE
0.80 A
H.V.FUSE
0.80 A
F5:
H.V.FUSE
0.80 A
H.V.FUSE
0.80 A
L
N
1
3
6
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
RY4:
COOK RELAY
RY3:
COOK RELAY
TH3:
EXHAUST
THERMISTOR
EXHAUST
THERMISTOR
TH1:
MAGNETRON
THERMISTOR
(Upper)
MAGNETRON
THERMISTOR
(Upper)
TH2:
MAGNETRON
THERMISTOR (Lower)
MAGNETRON
THERMISTOR (Lower)
T1: HIGH VOLTAGE
TRANSFORMER
(Front)
OVEN LAMP
ANTENNA
MOTOR
SM
SM
BM
T2: HIGH VOLTAGE
TRANSFORMER
(Rear)
OL
R-23AM
29
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGREMMED.
3. START BUTTON PRESSED.
1. DOOR CLOSED.
2. COOKING TIME PROGREMMED.
3. START BUTTON PRESSED.
Figure O-3 Oven Schematic-Cooking Condition
SW5:
STOP
SWITCH
STOP
SWITCH
CN-A
CN-A
F3 : WEAK POINT A017
BLU
NEUTRAL
LIVE
GRN/YLW
BRN
NOISE FILTER
SW1:
INTERLOCK SWITCH
INTERLOCK SWITCH
SW3:
MONITOR
SWITCH
SW4: MONITOR SWITCH
NOISE SUPPRESSION COIL
DISCHARGE RESISTOR 680 kΩ 1/2W
DISCHARGE RESISTOR 10 MΩ 1/2W
LINE CROSS CAPACITOR 0.22µ
F
/ AC250V
LINE BYPASS CAPACITOR
10000 pF/ AC250V
LINE BYPASS CAPACITOR
10000 pF/ AC250V
T3:
TOUCH CONTROL
TRANSFORMER
FUSE
2.5A
F2: FUSE F10A
TF1: TEMP. FUSE 150°C
(Upper Mag.)
TF3: EXHAUST
TEMP. FUSE
120°C
TF1:
TEMP. FUSE 150°C
(Lower Mag.)
TEMP. FUSE 150°C
(Lower Mag.)
CONTROL
UNIT
230 - 240V~50Hz
H. V. RECTIFIER
C1: H.V. CAPACITOR
0.94µF/ AC2300V
C2: H.V. CAPACITOR
0.94µF/ AC2300V
MG1: MAGNETRON (Upper)
F1: FUSE F10A
H. V. RECTIFIER
MG2: MAGNETRON (Lower)
RY1
EARTH
F4:
H.V.FUSE
0.80 A
H.V.FUSE
0.80 A
F5:
H.V.FUSE
0.80 A
H.V.FUSE
0.80 A
L
N
1
3
6
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
RY4:
COOK RELAY
RY3:
COOK RELAY
SW2:
INTERLOCK SWITCH
INTERLOCK SWITCH
TH3:
EXHAUST
THERMISTOR
EXHAUST
THERMISTOR
TH1:
MAGNETRON
THERMISTOR
(Upper)
MAGNETRON
THERMISTOR
(Upper)
TH2:
MAGNETRON
THERMISTOR (Lower)
MAGNETRON
THERMISTOR (Lower)
T1: HIGH VOLTAGE
TRANSFORMER
(Front)
OVEN LAMP
ANTENNA
MOTOR
SM
SM
BM
T2: HIGH VOLTAGE
TRANSFORMER
(Rear)
OL
R-23AM
30
Figure S-1. Pictrorial Diagram
1
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
2
3
4
5
6
1
2
3
4
5
6
BRN
NOISE FILTER
BLU
N
L
SW5 : STOP
SWITCH
TOUCH CONTRO
L PANEL
CN-C
3
6 GRN
2
4
5
1 ORG
NO
COM.
BLU
GRN
GRN
ORG
WHT
COM.
NO
SW1: INTERLOCK
SWITCH
(Cabinet side)
COM.
NO
COM.
NC
BRN
BLU
HIGH VOLTAGE COMPONENTS
MG1 :
MAGNETRON
(Upper)
White case
Black tape
MG2 :
MAGNETRON
(Lower)
T1 :
HIGH VOLTAGE
TRANSFORMER
F4: H.V. FUSE
F5: H.V. FUSE
H. V. RECTIFIER
C2 : HIGH VOLTAGE
CAPACITOR
BLK
WHT
OL :
OVEN LAMP
& SOCKET
CONNECTOR
TH3:
EXHAUST
THERMISTOR
G/Y
POWER
SUPPLY
CORD
EARTH
NEUTRAL
LIVE
BLK
WHT
SW3 :
MONITOR
SWITCH
(Cabinet side)
CN-A
CN-A
CN-B
4
1 BLK
5 YLW
3 RED
2
CN-G
4 BLU
1 WHT
5 BLU
3 BLU
2 BLU
4
1
5
3
2
CN-E
3 WHT
1 BLU
2 BLU
3
1
2
5 BLK
1 GRN
3 GRY
2 RED
4
BM :BLOWER
MOTOR
CN-B
GRN
BLU
COM.
NC
BRN
BLU
SW4 :
MONITOR
SWITCH
(Oven side)
BLU
BLU
RED
RED
RED
BRN
WHT
WHT
WHT
SW2: INTERLOCK
SWITCH
(Oven side)
YLW
WHT
ORG
ORG
BLU
SM:
ANTENNA
MOTOR
(Upper)
BLK
BLK
RED
WHT
BLK
T2 :
HIGH VOLTAGE
TRANSFORMER
C1 : HIGH VOLTAGE
CAPACITOR
H. V. RECTIFIER
TH1:
MAGNETRON
THERMISTOR (Upper
)
TH2:
MAGNETRON
THERMISTOR (Lower
)
BLK
BLK
WHT
BLK
W
H
T
W
H
T
B
L
K
B
L
K
O
R
G
O
R
G
F1 : FUSE F10A
(Cabinet side)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
(Blue case)
BLU
F2 : FUSE F10A
(Oven side)
Blue
case
TF1: TEMP. FUSE 150
˚C
(Upper MAG.)
TF3: EXHAUST
TEMP.
FUSE 120˚C
BRN
BLK
TF2: TEMP. FUSE 150
˚C
(Lower MAG.)
BRN
BLK
1
2
RED
GRN
1
2
GRY
GRN
1
2
WHT
GRN
RED
SM:
ANTENNA
MOTOR
(Lower)
TOUCH CONTROL
TRANSFORMER
ROTARY ENCODER UNIT
SWITCH UNIT ASSEMBLY
CN-D
CN-D
CN-E
RY1
BZ
1
1
1
3
1
1
1
5
5
6
8
RY4
F1: FUSE 2.5A
ORG
RED
YLW
WHT
1
2
3
4
5
6
7
8
BLU
BRN
BLK
WHT
A017
WHT
WHT
RY3
CN-C
CN-G
I-1
I-2
5
BRN
BRN
BRN
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