Sharp R-555 Service Manual ▷ View online
R-555(SL)
23
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
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.
R-555(SL)
24
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
NOTE: " " indicates components with potentials above 250V.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. START KEY TOUCHED
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. START KEY TOUCHED
Figure O-2. Oven Schematic-Cooking Condition
Figure O-1. Oven Schematic-OFF Condition
HIGH VOLTAGE TRANSFORMER
MAGNETRON
H.V. RECTIFIER
H. V. FUSE
0.7A
0.7A
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
MONITOR SWITCH
CONTROL
UNIT
UNIT
THERMAL
CUT-OUT
95˚C (MG)
CUT-OUT
95˚C (MG)
MONITORED
LATCH SWITCH
PRIMARY
INTERLOCK
SWITCH
LATCH SWITCH
PRIMARY
INTERLOCK
SWITCH
SH-B
SH-A
A2
FM
TTM
N.O.
N.O.
RY-1
RY2
2ND.
INTERLOCK
RELAY
COM.
COM.
A1
THERMAL
CUT-OUT
125˚C (OVEN)
CUT-OUT
125˚C (OVEN)
EARTH
BLU
BRN
LIVE
NEUTRAL
FUSE
F10A
F10A
N
L
LINE CROSS CAPACITOR
0.068
µ
/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022
µ
/AC250V
LINE BYPASS
CAPACITOR
0.0022
µ
/AC250V
NOISE FILTER
230-240V 50Hz
CAPACITOR
1.07
1.07
µ
F
AC2100V
2ND.
INTERLOCK
RELAYCONTROL
SWITCH
INTERLOCK
RELAYCONTROL
SWITCH
OL
MAGNETRON
H.V. RECTIFIER
H. V. FUSE
0.7A
0.7A
OVEN LAMP
MONITOR SWITCH
CONTROL
UNIT
UNIT
THERMAL
CUT-OUT
95ßC (MG)
CUT-OUT
95ßC (MG)
MONITORED
LATCH SWITCH
PRIMARY
INTERLOCK
SWITCH
LATCH SWITCH
PRIMARY
INTERLOCK
SWITCH
SH-B
SH-A
A2
FM
TTM
N.O.
N.O.
RY-1
RY2
2ND.
INTERLOCK
RELAY
COM.
COM.
A1
THERMAL
CUT-OUT
125ßC (OVEN)
CUT-OUT
125ßC (OVEN)
EARTH
BLU
BRN
LIVE
NEUTRAL
FUSE
F10A
F10A
N
L
LINE CROSS CAPACITOR
0.068
/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022
/AC250V
LINE BYPASS
CAPACITOR
0.0022
/AC250V
NOISE FILTER
230-240V 50Hz
CAPACITOR
1.07 F
AC2100V
1.07 F
AC2100V
2ND.
INTERLOCK
RELAYCONTROL
SWITCH
INTERLOCK
RELAYCONTROL
SWITCH
OL
HIGH VOLTAGE TRANSFORMER
TURNTABLE MOTOR
FAN MOTOR
R-555(SL)
25
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
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE
FUSE
H.V.
RECTIFIER
HIGH VOLTAGE COMPONENTS
OVEN LAMP
MAGNETRON
TURNTABLE
MOTOR
HIGH VOLTAGE
TRANSFORMER
BLK
GRY
RED
WHT
BLK
BLK
WHT
RED
THERMAL
CUT-OUT (MG)
NOISE FILTER
FAN MOTOR
THERMAL
CUT-OUT (OVEN)
BLK
BLK
RED
GRY
WHT
BLK
BLU
BRN
POWER
SUPPLY
CORD
EARTH
NEUTRAL
LIVE
G / Y
N
L
WHT
RED
COM.
MONITOR
SWITCH
COM.
N.O.
N.C.
2ND. INTERLOCK
RELAY CONTROL
SWITCH
MONITORED
LATCH SWITCH
COM.
NO
WHT
GRY
WHT
RED
GRN
GRN
GRY
ORG
2
1
YLW
BLK
BLK
GRY
GRY
GRY
RY2
RY1
SP1
IC1
2ND.
INTERLOCK
RELAY
CN-A
CN-B
CN-G
CN-C
CN-C
N.O.
N.O.
COM.
COM.
CN-A
T1
1
2
1
1
1
9
9
2
CONTROL UNIT
(CPU UNIT)
(POWER UNIT)
(Lower)
(Upper)
(Oven side)
(Cabinet side)
GRN
RED
2
1
CN-B
WHT
GRN
GRN
ORG
WHT
GRY
WHT
YLW
RED
R-555(SL)
26
Figure S-2. Power unit Circuit
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
C3
C5
C4
C6
C8
OVEN LAMP
TURNTABLE
MOTOR
MOTOR
FAN MOTOR
OVEN LAMP
TURNTABLE
MOTOR
MOTOR
FAN MOTOR
HIGH VOLTAGE
TRANSFOMER
TRANSFOMER
HIGH VOLTAGE
TRANSFOMER
TRANSFOMER
2ND. INTERLOCK
RELAY CONTROL
SWITCH
RELAY CONTROL
SWITCH
2ND. INTERLOCK
RELAY CONTROL
SWITCH
RELAY CONTROL
SWITCH
VRS1
10G471K
1000uF/25V
RY1
CN-C
GND
INT
BUZZER
C2
C1
RY2
NC
C1
D1
NO
B2
B1
SP1
VR
AC
a
b
d
c
AC
PKM22EPT
C9
1N4005E x 4
C7
NC
ZD1
HZ12C3
Q1
2SB1238
330 1 W
R1
1K
1/ 4W
1/ 4W
CN-B
(J
1
)
GND
A1
A2
CN-A
R2
D2
D3
D4
COM
NO
COM
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