DOWNLOAD Sharp R-743 (serv.man3) Service Manual ↓ Size: 463.35 KB | Pages: 24 in PDF or view online for FREE

Model
R-743 (serv.man3)
Pages
24
Size
463.35 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Complete
File
r-743-sm3.pdf
Date
PREV: Sharp R-743 (serv.man2) Service Manual

Sharp R-743 (serv.man3) Service Manual ▷ View online

12
743M -
MONITORED LATCH SWITCH, STOP SWITCH
AND MONITOR SWITCH REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the control panel assembly referring to
“CONTROL PANEL REMOVAL”.
3. Disconnect the leads from all switches.
4. Remove the two (2) screws holding the latch hook to the
oven cavity.
5. Remove the latch hook.
6. Push the retaining tab slightly and remove the switch.
DOOR REPLACEMENT
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Push the open button and open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-5 to free engaging parts.
4. Release choke cover  from door panel.
5. Now choke cover is free.
CHOKE COVER
PUTTY KNIFE
DOOR FRAME
Figure C-5. Door Disassembly
6. Release two (2) pins of door panel from two (2) holes of
upper and lower oven hinges by lifting up.
7. Now, door sub assembly is free from oven cavity.
8. Remove the four (4) screws holding the door panel to the
door frame.
9. Release door panel from eight (8) tabs of door frame by
sliding door panel downward.
10. Now, door panel is free.
11. Slide latch head upward and remove it from door frame
by releasing latch spring from door frame and latch head.
12. Now, latch head and latch spring are free.
13. Remove the two (2) screws holding the glass stopper to
the door frame.
14. Remove the glass stopper from the door frame.
15. Slide the front door glass leftwards and then slide
upwards to release the tabs holding it.
16. Now, the front door glass is free
COMPONENT REPLACEMENT AND ADJUSTMENT
MONITOR
SWITCH
SW2
MONITORED LATCH
SWITCH SW1
TAB
TAB
STOP
SWITCH
SW3
Figure C-4. Switches
13
743M -
RE-INSTALL
1. Re-install the front door glass to the door frame as
follows.
1) Insert the upper edge of the front door glass into the six
(6) tabs of the door frame.
2) Slide the front door glass downwards and insert the
lower edge of the front door glass into the six (6) tabs of
the door frame.
3) Slide the front door glass rightwards and insert the right
edge of the front door glass into the one (1) tab of the
door frame.
2. Re-install the glass stopper to the door frame as follows.
1) Re-install the glass stopper to the door frame so that the
two (2) holes of the glass stopper meet the two (2) pins
of the door frame.
2) Hold the glass stopper to the door frame with the two (2)
screws.
3. Re-install the latch spring to the latch head. Re-install
the latch spring to the door frame. Re-install latch head
to door frame.
4. Re-install door panel to door frame by fitting eight (8)
tabs of door frame to eight (8) holes of door panel.
5. Fit the door panel to the door frame with four (4) screws.
6. Inserttwo (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
7. Re-install choke cover  to door panel .
Note: After any service to the door;
Make sure that door sensing switch and monitored
latch switch are operating properly.
Figure C-6. Door Replacement
DOOR FILM
Removal
1. Tear the door film from the door panel.
2. Now, the door film is free.
Installation
1. Pull the tab on the backing film of the door film as shown
in Fig. 7.
2. Tear the backing film by pulling the tab.
3. Put the pasted side of the door film on the door panel.
Door film
Finger tab
Backing film
PIN
PIN
LOWER
OVEN HINGE
UPPER
OVEN HINGE
LOWER
OVEN HINGE
CHOKE COVER
DOOR
PANEL
DOOR SUB 
ASSEMBLY
COMPONENT REPLACEMENT AND ADJUSTMENT
Figure C-7. Door film
14
743M -
Figure O-1 Oven Schematic
  WIRING DIAGRAM
SW
 SWITCH
LATCH SWITCH
MONITORED
F8A
SW3:
MONITOR
MOTOR
TURN TABLE
FAN MOTOR
OVEN LAMP
NC
NO
NO
H.V.
F
FUSE
SW1
SW2
A5
A3
125 C
CUT OUT
THERMAL
MAG
160 C
CUT OUT
THERMAL
OVEN
NO.
COM.
NO.
COM.
OL
FM
M
T
T
RY1
STOP
B2
B1
GRILL HEATER
A1
RY3
RY2
1.02
230-240V   50HZ
15A
2100VAC
RECTIFIER
ASYMMETRIC
*
CAPACITOR
*
H.V.
*
POWER TRANSFORMER
RECTIFIER
*
MAGNETRON
0.0047  /250V
0.0047  /250V
680K/0.5W
10M/0.5W
NOISE SUPPRESSION COIL
/250V
0.22
FUSE
G-Y/15
/15
/15
BRN
BLU
L
EARTH
N
*INDICATES PARTS WITH POTENTIALS OVER 240V
15
743M -
Figure S-2. Control Panel Circuit
WIRING DIAGRAM
+
—
A 3
I-1
IZA918DR
LIQUID CRYSTAL DISPLAY
Q1
DTA143ES
Q24
DTA143ES
Q2
DTA123ES
Q40
DTA143ES
AC230-240V
50Hz
OVEN LAMP
FAN MOTOR
TURNTABLE
MOTOR
HEATER
MICRO  
Q22
DTB143ES
Q21
DTB143ES
C20
10 /50v
C21
0.1 /50v
CF1
CST4.00MGW
R1
510 1w 
R2
510 1w 
GND
VC
C3
0.1 /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
/50v
C2 1000
/35v
C6 10
/50v
C7 0.1
/50v
C12 0.1
/50v
C5
R21 4.7k
VRS1
10G471K
R3 4.7k
R60 4.7k
R53
4.7k
CR61
CR62
CR63
CR64
R10
1M
C11
0.1
/
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
WH-3
1min
10sec
SW65
SW66 
(C50)
(C51)
RY3
A 5
NO
COM
B 1
B 2
A 1
+
—
+
—
+
—
NO
COM
J3
C60 0.1 /50v
J5
J7
J9
J2
J4
J6
J8
S12
C3
C2
C1 
S11
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
INT1
INT0
P23
P22
P21
P20
R03
R02
R01
R00
VC2
VC1
NC
NC
NC
NC
NC
NC
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
S2
S1
: IF NOT SPECIFIED,  1SS270A
: IF NOT SPECIFIED,  0.01  / 16v
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