Sharp R-21ATP Service Manual ▷ View online
R-21ATP
27
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 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
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.
Dotted line indicates the path taken by the leakage detector.
28
R-21ATP
NOTE: " " indicates components with potential above 250V.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. "SELECT TIME" PAD TOUCHED.
3. COOKING TIME ENTERED.
4. START PAD TOUCHED.
1. DOOR CLOSED.
2. "SELECT TIME" PAD TOUCHED.
3. COOKING TIME ENTERED.
4. START PAD TOUCHED.
Figure O-2 Oven Schematic-Cooking Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. : APPEAR ON DISPLAY.
1. DOOR CLOSED.
2. : APPEAR ON DISPLAY.
Figure O-1 Oven Schematic-OFF Condition
HIGH VOLTAGE
TRANSFORMER
MAGNETRON
H.V. RECTIFIER
CAPACITOR
1.07
µ
F
AC2400V
ANTENNA MOTOR
FAN MOTOR
OVEN LAMP
MONITOR SWITCH
CONTROL
UNIT
THERMAL
CUT-OUT
125˚C (OVEN)
CUT-OUT
125˚C (OVEN)
LATCH
SWITCH
SWITCH
B1
B2
A5
A7
OL
FM
AM
THERMAL
CUT-OUT
145˚C (MG)
CUT-OUT
145˚C (MG)
RY-3
RY-2
1ST. INTERLOCK
SWITCH
SWITCH
2ND. INTERLOCK RLAY
CONTROL SWITCH
CONTROL SWITCH
MONITOR
RESISTOR
0.8/20W
EARTH
230 - 240V
˜
50Hz
BLU
BRN
LIVE
NEUTRAL
G-Y
FUSE
M10A
N
L
DISCHARGE RESISTOR 680 k
Ω
NOISE SUPPRESSION COIL
NOISE FILTER
H.V. FUSE
0.75A
LINE BYPASS
CAPACITOR
0.0033
µ
F/ AC 250V
DISCHARGE
RESISTOR 10M
Ω
LINE BYPASS
CAPACITOR
0.0033
µ
F/ AC 250V
LINE CROSS CAPACITOR 0.068
µ
F/ AC 250V
HIGH VOLTAGE
TRANSFORMER
MAGNETRON
H.V. RECTIFIER
CAPACITOR
1.07
µ
F
AC2400V
ANTENNA MOTOR
FAN MOTOR
OVEN LAMP
MONITOR SWITCH
CONTROL
UNIT
THERMAL
CUT-OUT
125˚C (OVEN)
CUT-OUT
125˚C (OVEN)
LATCH
SWITCH
SWITCH
B1
B2
A5
A7
OL
FM
AM
THERMAL
CUT-OUT
145˚C (MG)
CUT-OUT
145˚C (MG)
RY-3
RY-2
1ST. INTERLOCK
SWITCH
SWITCH
2ND. INTERLOCK RLAY
CONTROL SWITCH
CONTROL SWITCH
MONITOR
RESISTOR
0.8/20W
EARTH
230 - 240V
˜
50Hz
BLU
BRN
LIVE
NEUTRAL
G-Y
FUSE
M10A
N
L
DISCHARGE RESISTOR 680 k
Ω
NOISE SUPPRESSION COIL
NOISE FILTER
H.V. FUSE
0.75A
LINE BYPASS
CAPACITOR
0.0033
µ
F/ AC 250V
DISCHARGE
RESISTOR 10M
Ω
LINE BYPASS
CAPACITOR
0.0033
µ
F/ AC 250V
LINE CROSS CAPACITOR 0.068
µ
F/ AC 250V
R-21ATP
29
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
Figure S-1. Pictorial Diagram
THERMAL CUT-OUT
125˚C(OVEN)
THERMAL
CUT-OUT
145
°
C(MAG.)
FAN MOTOR
WHT
YLW
WHT
BLK
HIGH VOLTAGE COMPONENTS
MAGNETRON
H.V.
CAPACITOR
H.V.
FUSE
H.V.
RECTIFIER
POWER TRANSFORMER
G-Y
POWER SUPPLY
CORD
COM
GRY
WHT
ORG
WHT
WHT
N.C.
N.O.
COM.
ORG
ORG
WHT
WHT
BRN
RED
PNK
ANTENNA
MOTOR
MONITOR
SWITCH
GRY
GRY
BLK
YLW
YLW
ORG
YLW
PNK
PNK
IC1
RY2
T1
RY3
CN-G
CN-A
7
1
1
2
CN-B
2
3
4
5
1
PNK
WHT
CN-A
NEUTRAL
EARTH
GRN
GRY
N.O.
COM.
COM.
WHT
GRY
WHT
N.O.
2ND. INTERLOCK
RELAY CONTROL
SWITCH (Oven side)
LATCH
SWITCH
(Cabinet side)
1ST. INTERLOCK
SWITCH
CONTROL UNIT
MONITOR
RESISTOR
2
1
GRN
G R N
G R N
GRY
CN-B
BRN
RED
ORG
WHT
NOTE:
Neutral (ORG) wire must
be connected to the
terminal with black mark
on the oven light socket.
BLACK MARK
ORG
BRN
BLU
LIVE
OVEN LAMP
AND SOCKET
WHT
RED
RED
WHT
RED
L
N
30
R-21ATP
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
Figure S-2. Control Panel Circuit
+
+
+
–
+
–
–
–
+
–
+
–
+
–
+
–
+
–
A 3
AC230-240V
50Hz
OVEN LAMP
ANTENNA
MOTOR
FAN MOTOR
TARNTABLE
MOTOR
HIGH VOLTAGE
TRANSFORMER
A 5
A 7
N.O.
N.O.
COM
COM
B 1
B 2
DOOR
SWITCH
G12
G11
G10
G 9
G 1
G 2
G 3
G 4
G 5
G 6
G 7
G 8
7
SELECT
POWER
START
17
18
19
20
15
16
13
14
11
12
SET
CHECK
SIGNAL
DOUBLE
QUANTITY
SELECT
TIME
EXPRESS
DEFROST
STOP/
CLEAR
8
9
0
5
6
3
4
1
2
GND
17
11
1
8
16
9
12
13
14
15
16
07
13
12
11
10
9
8
7
6
5
4
3
2
1
01
02
03
04
05
06
IC3
LIGHT EMITTING DIODE
LED1
IC2
AT24C02
IC1
IZA897DR
AVSS
VREF
AN7
AN6
AN5
AN4
AN3
AN2
AN1
AN0
P55
P54
P53
P52
P51
P50
P47
P46
A0
1
4
8
5
A1
A2
VSS
VCC
TEST
SCL
SDA
P45
P44
P43
P42
INT1
P40
P71
P70
XIN
XOUT
VSS
RESET
VCC
P30
P31
P32
P33
P34
P35
P36
P37
P00
P01
P02
P03
P04
P05
P06
P07
P10
P11
P12
P13
P14
P15
P16
P17
P20
P21
P22
P23
P24
P25
P26
P27
VEE
VRS1
D6 1N4002
D5 1N4002
R90 100 1w
D20
D21
C30 47
µ
/10v
C5 47
µ
/10v
C6 0.1
µ
/50v
C31
C70
R4 4.7k
(J1)
a
b
R6 1k
ZD3
HZ20-1
Q24
2SC1740S
RY3
RY2
JA
R30 100
R71 4.7k
R80 4.7k
R81 4.7k
R82 4.7k
R83 4.7k
D23
D
70
R32 2.7k
R33 4.7k
R31 15k
R70 4.7k
R5 4.7k
R88 4.7k
R87 4.7k
R86 4.7k
R85 4.7k
R84 4.7k
c
d
D1
D2
D4
D1-4 1N4002
C10
470
µ
/25v
C11 470
µ
/50v
C21
10
µ
/25v
(J3)
(J5)
(J4)
(J6)
C20
0.1
µ
/50v
Q3
DTC143ES
or KRC101M
Q20
DTB143ES
or KRA223M
Q21
DTC143ES
or KRC101M
CF1
CST4.00MGW
Q22
DTD143ES
or KRC243M
Q2
DTA123ES
SP1
Q1 KIA7805P1
C1 2200
µ
/25v
C8 0.1
µ
/50v
C2 0.1
µ
/50v
C9
0.1
µ
/50v
C3 47
µ
/10v
C4 0.1
µ
/50v
R3 4.7k
R40 2.7k
R50 100
NOTE :
: IF NOT SPECIFIED. 1/4W
±
5%
: IF NOT SPECIFIED. 1SS270A
: IF NOT SPECIFIED. 0.01
µ
/ 16v
R51 100
R52 100
R53 100
R54 100
R55 100
R56 100
R57 100
R58 100
C7
ZD2
HZ4A2
C13 10
µ
/25v
D3
T1
10G471K
ON
DEF.
NO.
X 2
CHECK
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