Sharp R-259M (serv.man2) Service Manual ▷ View online
R259(W)
12 – 1
R259(W)
Service Manual
CHAPTER 12.
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
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.
[1] PREPARATION
The following items are required to carry out this test:
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
± 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 Lab-
oratory Standards.
Recommended instruments are:-
Apollo “XI”
Celtec “A100”
Before commencing the test, check that the leakage detector is functioning and adjusted according to the manufacturer's instructions, and any spac-
ers are fitted to ensure that measurement is taken 5cm from the surface of the oven.
ers are fitted to ensure that measurement is taken 5cm from the surface of the oven.
[2] 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 impor-
tant, 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. 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.
3. 3.As shown in the diagram below, move the probe slowly (not faster than 2.5 cm/sec.);-
1) around the edge of the door following the gap
2) across the face of the door
3) 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.
R259(W)
13 – 1
R259(W)
Service Manual
CHAPTER 13.
CIRCUIT DIAGRAMS
[1] Oven Schematic
Figure O-1 Oven Schematic-OFF Condition
Figure O-2 Oven Schematic-ON Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
1. DOOR CLOSED.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
HIGH
VOLTAGE
TRANSFORMER
MAGNETRON
H.V.
RECTIFIER
TURNTABLE
MOTOR
FAN
MOTOR
OVEN
LAMP
MONITOR
SWITCH
CONTROL UNIT
2ND.
INTERLOCK
RELAY
INTERLOCK
RELAY
1ST. LATCH
SWITCH
SWITCH
2ND.
INTERLOCK
RELAY CONTROL
SWITCH
INTERLOCK
RELAY CONTROL
SWITCH
OL
FM
TTM
N.O.
COM.
COM.
(RY-1)
(RY-2)
EARTH
230
-
240V
50Hz
BLU
BRN
LIVE
NEUTRAL
G-Y
FUSE
T6.3A
N
L
NOISE
SUPPRESSION
COIL
NOISE FILTER
TEMP.
FUSE
FUSE
H.V.
FUSE
0.6A
B1
B2
NOTE: "
" indicates components with potentials above 250V
HIGH
VOLTAGE
TRANSFORMER
MAGNETRON
H.V.
RECTIFIER
TURNTABLE
MOTOR
FAN
MOTOR
OVEN
LAMP
MONITOR
SWITCH
CONTROL UNIT
2ND.
INTERLOCK
RELAY
INTERLOCK
RELAY
1ST. LATCH
SWITCH
SWITCH
2ND.
INTERLOCK
RELAY CONTROL
SWITCH
INTERLOCK
RELAY CONTROL
SWITCH
OL
FM
TTM
N.O.
COM.
COM.
(RY-1)
(RY-2)
EARTH
BLU
BRN
LIVE
NEUTRAL
G-Y
FUSE
T6.3A
N
L
NOISE
SUPPRESSION
COIL
NOISE FILTER
TEMP.
FUSE
FUSE
H.V.
FUSE
0.6A
B1
B2
230
-
240V
50Hz
R259(W)
13 – 2
[2] Pictorial Diagram (Figure S-1)
Figure S-1. Pictorial Diagram
BLU
MONITOR
SWITCH
1ST.
LATCH
SWITCH
COM
COM
RED
N.C.
N.O.
N.O.
COM
GRY
GRN
GRN
GRY
TEMPERATURE
FUSE
(OVEN)
2ND.
INTERLOCK
RELAY
C
ONTROL
SWITCH
BLK
ORG
GRN
CONTROL
PANEL
GRY
CN-B
CN-G
2
1
N.O.
T1
RY1
N.O.
RY2
GRY
GRY
RED
BLK
WHT
CN-B
2
1
GRN
GRY
COM
N.O.
GRY
HIGH
VOLTAGE
CAPACITOR
HIGH
VOLTAGE
FUSE
H.V.
RECTIFIER
HIGH
VOLTAGE
COMPONENTS
MAGNETRON
TURNTABLE
MOTOR
HIGH
VOLTAGE
TRANSFORMER
RED
RED
GRY
RED
WHT
WHT
ORG
FUSE
EARTH
FAN
MOTOR
BLU
GRY
RED
OVEN
L
AMP
RED
BRN
BLU
L
N
WHT
RED
Power
S
upply
Cord
Oven
Cavity
Back
Plate
Screw
LIVE
NEUTRAL
Noise
Filter
G
/
Y
R
E
D
GRY
WHT
ORG
O
R
G
R259(W)
13 – 3
[3] Control Unit Circuit (Figure S-2)
Figure S-2. Control Unit Circuit
POWER
LEVEL
10min.
<
KEY
UNIT
>
<
POER
UNIT
>
<
LSI
UNIT
>
CHICKEN
QUARTERS
WHOLE
POULTRY
MEAT
JOINT
(TIME)
(TIME)
(WEIGHT)
(WEIGHT)
STOP
CLEAR
10sec.
1min.
ROAST
POULTRY
ROAST
PORK
ROAST
BEEF
/
L
AMB
AUTO
COOK
START
AUTO
MINUTE
KITCHEN
TIMER
CLOCK
SET
G1
NO
RST
GND
-5V
INT
VA
BZ
BL
COM
M
DOOR
COM
NO
B1
B2
2ND.
INTERLOCK
RELAY
CONTROL
SWITCH
MICRO
AC
AC
240V
50Hz
AC
OVEN
LAMP
TURNTABLE
MOTOR
FAN
MOTOR
COM
G1
G2
G3
G4
G5
G6
G2
G3
G4
G5
G6
G7
G8
G9
G10
G7
G8
G9
G10
G7
G1
P33
P26
P25
P24
P23
P22
P50
P51
P52
P53
G2
G3
G4
G5
G6
1
2
3
4
5
6
7
8
9
10
G8
G9
G10
R76
15K
R70
15K
R71
15K
R72
15K
R73
15K
R74
15K
R75
15K
R77
15K
R78
15K
R79
15K
RY2
OMIF-S-112LM-SP
RY1
OMIF-S-112LM
D3
D4
D2
D1
ZD3
HZ12C-1
R21
430,1/4W
R3
27,1/4W
R1
330,1/2W
R20
130,1W
R2
470,1W
Q23
2SB1238
Q22
DTA123JS
Q1
DTA123EKA
LCD
IC-1
Q20
DTA143EKA
Q30
DTA143EKA
Q10
DTA143EKA
R41
15K
R4
4.7K
R40
4.7K
R30
3.3K
R10
15K
R6
15K
C11
0.01uF/50V
R7
4.7K
R8
4.7K
R9
4.7K
C3
C60-C63
330pF/50Vx
4
R60-R63
270Kx
4
R80
11KF
C4
0.01uF/50V
C40
0.01uF
50V
D40
D22
D21
D20
(J1)
C12
VRS1
10G471K
C5
C1
C6
220uF/10V
ZD2
HZ5C2
ZD1
(J10)
(J11)
AIN2
AIN3
AIN4
AIN5
(J12)
(J13)
(J14)
(J15)
(J16)
(J17)
C10
HZ4A2
-
+
-
+
-
+
10uF/35V
1000uF/35V
C21
Q21
DTD143ES
Q2
2SB1238
LD1
LD2
LD3
LD4
D5
D6
SP1
C20
T1
PA145DR
ab
d
c
D1
--
D4
1N4002X4
AIN5
AIN4
AIN3
AIN2
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
P70
P71
P72
AVDD
AIN5
AIN4
AIN3
AIN2
P03
P02
P01
P00
RESET
X2
X1
VSS
VDD
XT2
XT1
IC
P53
P52
P51
P50
33
16
48
1
49
64
32
17
P26
P25
P24
P23
P22
AINT1
AINT0
AVSS
P11
P10
P33
P32
P31
INTP0
P26
P25
P24
P23
P22
BZ090
P20
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
COM3
COM2
COM1
COM0
VLC2
VLC1
VLC0
CAPL
CAPH
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG9
SEG2
SEG1
COM2
COM1
COM0
S12
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
C3
C2
C1
P33
P50
P51
P52
P53
C80
22pF/50V
C60
C61
C62
C63
R60
R61
R62
R63
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