Sharp R-642M Service Manual ▷ View online
13
R-642M -
RE-WIRING
Ensure the following:
1.
Wires must not touch:
a)
High voltage parts.
(Magnetron, high voltage transformer, high voltage capacitor and high voltage rectifier assembly)
(Magnetron, high voltage transformer, high voltage capacitor and high voltage rectifier assembly)
b)
Parts that become hot.
(Heating elements, oven lamp, oven cavity magnetron and high voltage transformer)
(Heating elements, oven lamp, oven cavity magnetron and high voltage transformer)
c)
Sharp edges.
(Bottom plates, oven cavity, waveguide flange, chassis support and other metallic parts)
(Bottom plates, oven cavity, waveguide flange, chassis support and other metallic parts)
d)
Movable parts.
(Fan blade, any motor, switch, switch lever and open button)
(Fan blade, any motor, switch, switch lever and open button)
2.
Positive lock connectors are fitted correctly. Ensure the locking pin is located correctly.
3.
Wires are connected correctly as per pictorial diagram.
4.
No wire leads are trapped by the outer wrap.
WARNING: Before carrying out any work carry out 3D checks
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
WIRING / RE-WIRING
MICROWAVE MEASUREMENT
After any repair, the microwve 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 275ml 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 275ml is 50 W/m
2
(equivalent to
5mW/cm
2
) at a distance of 5cm from the oven.
PREPARATION
The following items are required to carry out this test:-
1.
1.
A low form of 600ml beaker made from
electrically non-conductive material, such as
glass or plastic, with an inside diameter of
approximately 8.5cm. This must contain 275
glass or plastic, with an inside diameter of
approximately 8.5cm. This must contain 275
±
15ml of water, at an initial temperature of 20
±
2
°
C.
2.
A leakage detector which has been calibrated
within the preceeding 12 months to a stand
whose accuracy can be traced to National
Physical Laboratory Standards.
whose accuracy can be traced to National
Physical Laboratory Standards.
Recommended instruments are:
Apollo "XI"
Celtec "A1000"
Celtec "A1000"
Before commencing the test, check 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.
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.
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 5mW/cm
2
), it is not
normal to detect anything signifcant, and therefore any detected leakage should be investigated.
PROCEDURE
1.
Place the beaker containing the water load
inthe 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
the energy.
inthe 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
the 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.
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.
As shown in the diagram below, move the
probe slowly (not faster than 2.5cm/sec);-
probe slowly (not faster than 2.5cm/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
top
14
R-642M -
WIRING DIAGRAMS
CIRCUIT SUBJECT TO CHANGE
WITHOUT NOTICE.
DOOR CLOSED
COOK OFF CONDITION
Note:
AC CORD CONNECTION
BRN : BROWN
BLU : BLUE
G-Y : GREEN AND YELLOW STRIPE
AC CORD CONNECTION
BRN : BROWN
BLU : BLUE
G-Y : GREEN AND YELLOW STRIPE
NOTE:
* INDICATES COMPONENTS
WITH POTENTIALS
ABOVE 250V
SCHEMATIC DIAGRAM
15
R-642M -
Figure S-1. Pictorial Diagram
WIRING DIAGRAMS
BLK
OVEN LAMP
THERMAL
CUT-OUT
145¡C(TX)
FM:
FAN MOTOR
BLU
WHT
WHT
BLU
HIGH VOLTAGE COMPONENTS
H.V.WIRE B
MG:
MAGNETRON
H.V.WIRE A
C:
H.V.
CAPACITOR
H.V.
RECTIFIER
T: HIGH VOLTAGE
TRANSFORMER
NOISE FILTER
POWER SUPPLY CORD
F8A
FUSE
RED
RED
BRN
BLU
G/Y
5
4
WHT
3
2
1
COM
WHT
NO
NO
COM
SW3
STOP
SWITCH
NO
COM
GH:
GRILL HEATING
ELEMENT
N
L
WHT
1
3
5
2
1
COM
NO
COM
NO
CN-B
RY3
RY2
GRN
CONTROL PANEL
BLU
BLU
BRN
TURNTABLE
MOTOR
RED
SW2
MONITOR
SWITCH
SW1
LATCH
SWITCH
BLK
BRN
BRN
BLK
CN-A
CN-A
1
CN-B
2
RED
GRN
BRN
BRN
BLU
W
H
T
B
L
K
B
R
N
W
H
T
B
L
U
B
R
N
B
L
U
B
L
K
B
L
U
W
H
T
B
L
K
R
E
D
W
H
T
B
L
K
W
H
T
W
H
T
R
E
D
LIVE
NEUTRAL
EARTH
THERMAL
CUT-OUT
150¡C(OVEN)
WHT
BRN
BLK
15A
FUSE
16
R-642M -
WIRING DIAGRAMS
Figure S-2. Control Panel Circuit
+
–
A 1
I-1
IZA918DR
LIQUID CRYSTAL DISPLAY
Q1
DTA143ES
Q24
DTA143ES
Q1
DTA123ES
Q40
DTA143ES
AC230-240 V
50Hz
OVEN LAMP
FAN MOTOR
TURNTABLE
MOTOR
HEATER
MICRO
Q22
DTA143ES
Q21
DTA143ES
C20
10
µ
/35v
C21
0.1
µ
/50v
(C60) 0.1
µ
/50v
CF1
CST4.00MGW
R1
510 1w
R2
510 1w
GND
VC
C3
0.1
µ
/50v
Q20
2SB1238
Q3
2SB1238
Q23
DTD143ES
R22
91 1/2w
R20 1k
D23
DOOR SWITCH
NOTE
: IF NOT SPECIFIED, 1/4w
±
5%
D30
D21
D20
C1 0.1
µ
/50v
C2 1000
µ
/35v
C6 10
µ
/50v
C7 0.1
µ
/50v
C12 0.1
µ
/50v
C5
R61
R62
R63
R64
R21 4.7k
VRS1
10G471K
R3 4.7k
R60 4.7k
R53
4.7k
R10
1M
C11
0.1
µ
/
50v
R5 240
R40 3.3k
R4 4.7k
ZD1
HZ5C-2
ZD20
HZ20-1
ZD2
HZ4A2
C4
D22
C30
R31
4.7k
RY1
a
b
(J1)
c
d
D2
D4
LD4
LD3
LD2
LD1
D1
D3
WH-1
WH-2
SP1
1
4
6
8
T1
RY2
R30 15k
SW60
START
AUTO
MINUTE
STOP/
CLEAR
AUTO COOK/
DEFROST
MICRO GRILL
DUAL
SW61
SW63
SW62
SW64
10min
1min
10sec
SW65
SW66
WH-3
(C50)
(C51)
RY3
A 5
NO
COM
B 1
B 2
A 3
+
–
+
–
+
–
NO
COM
J3
J5
J7
J9
J2
J4
J6
J8
S12
C3
C2
C1
S11
S10
S9
S8
S7
S6
S5
S4
S3
S10
S9
S8
S7
S6
S5
S4
S3
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
VC3
17
18
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
19
20
21
22
23
24
25
26
27
28
29
30
31
32
XRESET
XTEST
NC
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
COM3
COM2
VSS
OSC1
OSC2
VD1
VDD
AVDD
AVREF
AVSS
NC
NC
R40
R41
R42
R43
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
BZ
NC
COM1
COM0
K03
K02
K02
INT1
INT0
INT0
P23
P22
P21
P20
R03
R02
R01
R00
P22
P21
P20
R03
R02
R01
R00
VC2
VC1
NC
NC
NC
NC
NC
NC
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
S2
S1
S1
: IF NOT SPECIFIED, 1SS270A
: IF NOT SPECIFIED, 0.01
µ
/ 16v
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