Sharp R-464 (serv.man5) Service Manual ▷ View online
R-464(SL)
24
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-464(SL)
25
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
WITH 150
˚C THERMOSTAT
IN PRIMARY WI
N
D
ING
MAGNETRON
H.V. RECTIFIER
H. V. FUSE
0.75A
CAPACITOR
1.07
1.07
µ
AC2300V
TURNTABLE MOTOR
FAN MOTOR
FAN MOTOR
OVEN LAMP
2ND. INTERLOCK
RELAY CONTROL
SWITCH
RELAY CONTROL
SWITCH
1ST.
INTERLOCK
SWITCH
INTERLOCK
SWITCH
2ND.
INTERLOCK
RELAY
INTERLOCK
RELAY
MONITOR SWITCH
CONTROL
UNIT
B1
B2
OL
FM
FM
TTM
N.O.
N.O.
COM.
COM.
THERMAL
CUT-OUT
(OVEN)
CUT-OUT
(OVEN)
THERMAL
CUT-OUT
(MG)
CUT-OUT
(MG)
RY-2
RY-1
NOISE FILTER
MONITOR
RESISTOR
0.8/20W
RESISTOR 10 M
Ω
1/2W
EARTH
BLU
BRN
230-240V
˜
50Hz
G-Y
FUSE
N
L
LINE CROSS CAPACITOR
0.22
µ
/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0033
µ
/AC250V
LINE BYPASS CAPACITOR
0.0033
µ
/AC250V
RESISTOR 680 K
Ω
1/2W
Fuse M10A is used until serial number 0109xxxxx.
Fuse F10A is used from serial number 0110xxxxx.
Fuse F10A is used from serial number 0110xxxxx.
HIGH VOLTAGE
TRANSFORMER
WITH 150
˚C THERMOSTAT
IN PRIMARY WI
N
D
ING
MAGNETRON
H.V. RECTIFIER
H. V. FUSE
0.75A
CAPACITOR
1.07
1.07
µ
AC2300V
TURNTABLE MOTOR
FAN MOTOR
FAN MOTOR
OVEN LAMP
2ND. INTERLOCK
RELAY CONTROL
SWITCH
RELAY CONTROL
SWITCH
1ST.
INTERLOCK
SWITCH
INTERLOCK
SWITCH
2ND.
INTERLOCK
RELAY
INTERLOCK
RELAY
MONITOR SWITCH
CONTROL
UNIT
B1
B2
OL
FM
FM
TTM
N.O.
N.O.
COM.
COM.
THERMAL
CUT-OUT
(OVEN)
CUT-OUT
(OVEN)
THERMAL
CUT-OUT
(MG)
CUT-OUT
(MG)
RY-2
RY-1
NOISE FILTER
MONITOR
RESISTOR
0.8/20W
RESISTOR 10 M
Ω
1/2W
EARTH
BLU
BRN
230-240V
˜
50Hz
G-Y
N
L
LINE CROSS CAPACITOR
0.22
µ
/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0033
µ
/AC250V
LINE BYPASS CAPACITOR
0.0033
µ
/AC250V
RESISTOR 680 K
Ω
1/2W
FUSE
Fuse M10A is used until serial number 0109xxxxx.
Fuse F10A is used from serial number 0110xxxxx.
Fuse F10A is used from serial number 0110xxxxx.
R-464(SL)
26
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
COM.
MONITOR
SWITCH
COM.
N.O.
N.C.
2ND. INTERLOCK
RELAY CONTROL
SWITCH
1ST.
INTERLOCK
SWITCH
TURNTABLE
MOTOR
FAN MOTOR
FAN MOTOR
7-PIN WIRE HARNESS
HIGH VOLTAGE
TRANSFORMER
COM.
NO
BLK
WHT
WHT
RED
ORG
WHT
WHT
BLK
WHT
1
2
BLK
BLK
GRY
GRN
WHT
RED
RED
WHT
BLK
ORG
THERMAL
CUT-OUT (MG)
THERMAL
CUT-OUT (OVEN)
WHT
GRY
GRY
WHT
RED
RED
RED
RED
GRN
GRY
2
3
1
ORG
BLK
WHT
WHT
RED
ORG
BLK
CN-B
CPU UNIT (on the door)
PPL
BLU
GRN
YLW
ORG
RED
BRN
7
5
6
3
4
1
2
CN-C
P
P
L
B
L
U
G
R
N
Y
L
W
O
R
G
R
E
D
B
R
N
75
6
3
41
1
7
2
CN-C
CN-C
IC1
CN-G
WHT
RED
RED
RED
RED
G/Y
B
L
U
WHT
POWER SUPPLY
CORD
B
R
N
NOISE
FILTER
EARTH
NEUTRAL
LIVE
N
L
WHT
RED
WHT
COM.
COM.
N.O.
N.O.
RY2
RY1
2ND.
INTERLOCK
RELAY
CN-C
CN-B
T1
1
1
2
7
POWER UNIT
MONITOR RESISTOR
BLK
Display
