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Model
R-8740 (serv.man10)
Pages
5 Few pages! See other manuals at the bottom of the first or last page.
Size
488.66 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Component replacement and adjustment procedure
File
r-8740-sm10.pdf
Date

Sharp R-8740 (serv.man10) Service Manual ▷ View online

R-8740M  - 31
1. CARRY OUT 3D CHECKS
2. Disconnect the wire leads to the grill heating element.
3. Remove the two(2) screws holding the exhaust duct
assembly to the oven cavity.
4. Push the two tabs holding the grill heating element
assembly to the oven cavity.
5. Release the grill heating element assembly from the
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.
If the monitored switch, stop switch and monitor switch do not
operate properly due to a mis-adjustment, the following
before the door can be opened.
3. The monitor switch contacts of (COM.- NC.) close when
the door is opened and the monitored latch switch contacts
of (COM.- NO.) open and  contacts of (COM.- NC.) close
when the door is opened.
4. Re-install outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)
Figure C-6. Switch Adjustment
adjustment should be made.
1. CARRY OUT 3D CHECKS
2. Loosen the two (2) screw holding the latch hook to the
oven cavity front flange.
3. With the door closed, adjust latch hook by moving it back
and forward or up and down. In and out play of the door
allowed by the latch hook should be less than 0.5 mm.
The horizontal position of the latch hook should be placed
where the latch head has pushed the plungers of the
monitor switch with the door closed. The vertical position
of the latch hook should be placed where the latch head
has pushed the plungers of the monitored latch switch
and stop switch with the door closed.
4. Secure the screws firmly.
5. Make sure all of the switches operate. If the latch head
has not pushed the plungers of the monitor switch with
door closed, adjust the latch hook position.
At that time, the latch head should have pushed the
plungers of the monitored latch switch and stop switch. If
the latch head has not pushed the plungers of the
monitored latch switch and stop switch with door closed,
loose the two (2) screws holding latch hook to the oven
cavity front flange and adjust the latch hook position.
After adjustment, make sure of the following:
1. In and out play of door remains less than 0.5 mm when
latched position. First check latch hook position, pushing
and pulling upper portion of door toward the oven face.
Then check the lower latch hook position, pushing and
pulling lower portion of door toward the oven face. Both
results (plays of the door) should be less than 0.5mm.
2. The monitored switch and stop switch interrupt the circuit
1. CARRY OUT 3D CHECKS.
2. Remove the fan duct from the oven cavity, referring to
"FAN MOTOR REPLACEMENT".
3. Disconnect the wire leads from the bottom heating
element.
BOTTOM HEATING ELEMENT REMOVAL
4. Remove the two (2) nuts holding the bottom heating
element to the oven cavity right wall.
5. Remove the two (2) nuts holding the bottom heating
element to the heater cover with the heat sealed spring
at the oven cavity left wall.
6. Remove the bottom heating element from the oven
cavity.
LATCH
HEADS
LATCH HOOK
MONITORED LATCH
SWITCH
STOP SWITCH
OPEN LEVER
DOOR OPEN BUTTON
MONITOR 
SWITCH
oven cavity by sliding the cover.
6. Now the grill heating element assembly is free.
Figure C-5. Switches
GRILL HEATING ELEMENT ASSEMBLY REMOVAL
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
MONITOR SWITCH
MONITORED LATCH SWITCH
TAB
TAB
STOP SWITCH
MONITORED LATCH  SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT
R-8740M  - 32
DOOR REPLACEMENT REMOVAL
Figure C-5. Door Disassembly
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.
6. Lift the door upwards.
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 six (6) 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
with 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
downwards to release the tabs holding it.
16. Now, the front door glass is free
RE-INSTALL
1. Re-install the front door glass to the door frame as follows.
Insert the upper edge of the front door glass into the six
(6) tabs of the door frame.
a) 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.
b) 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 o the door frame as follows.
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.
a) 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 six (6) tabs
of door frame to six (6) holes of door panel.
5. Hold the door panel to the door frame with four (4) screws.
6. Locate door panel hinge pins into cavity hinge location
holes.
7. Re-install choke cover  to door panel by clipping into
position.
Note: After any service to the door;
(A) Make sure that door sensing switch and primary
latch switch are operating properly. (Refer to chapter
"Test Procedures".).
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards. (Refer to
Microwave Measurement Procedure.)
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through latch
holes and that latch head goes through centre of latch
hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Check for microwave leakage around door with an
approved microwave survey meter.  (Refer to Microwave
Measurement Procedure.)
Note:
Figure C-6. Door Replacement
NOTE: When carrying out any repair to the door,
do not bend or warp the slit choke (tabs on
the door panel assembly) to prevent
microwave leakage.
Door frame
Choke cover
Putty knife
PIN
PIN
OVEN HINGE
CHOKE COVER
DOOR
PANEL
DOOR SUB 
ASSEMBLY
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
R-8740M  - 32
DOOR REPLACEMENT REMOVAL
Figure C-5. Door Disassembly
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.
6. Lift the door upwards.
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 six (6) 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
with 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
downwards to release the tabs holding it.
16. Now, the front door glass is free
RE-INSTALL
1. Re-install the front door glass to the door frame as follows.
Insert the upper edge of the front door glass into the six
(6) tabs of the door frame.
a) 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.
b) 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 o the door frame as follows.
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.
a) 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 six (6) tabs
of door frame to six (6) holes of door panel.
5. Hold the door panel to the door frame with four (4) screws.
6. Locate door panel hinge pins into cavity hinge location
holes.
7. Re-install choke cover  to door panel by clipping into
position.
Note: After any service to the door;
(A) Make sure that door sensing switch and primary
latch switch are operating properly. (Refer to chapter
"Test Procedures".).
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards. (Refer to
Microwave Measurement Procedure.)
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through latch
holes and that latch head goes through centre of latch
hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Check for microwave leakage around door with an
approved microwave survey meter.  (Refer to Microwave
Measurement Procedure.)
Note:
Figure C-6. Door Replacement
NOTE: When carrying out any repair to the door,
do not bend or warp the slit choke (tabs on
the door panel assembly) to prevent
microwave leakage.
Door frame
Choke cover
Putty knife
PIN
PIN
OVEN HINGE
CHOKE COVER
DOOR
PANEL
DOOR SUB 
ASSEMBLY
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
R-8740M  - 32
DOOR REPLACEMENT REMOVAL
Figure C-5. Door Disassembly
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.
6. Lift the door upwards.
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 six (6) 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
with 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
downwards to release the tabs holding it.
16. Now, the front door glass is free
RE-INSTALL
1. Re-install the front door glass to the door frame as follows.
Insert the upper edge of the front door glass into the six
(6) tabs of the door frame.
a) 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.
b) 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 o the door frame as follows.
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.
a) 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 six (6) tabs
of door frame to six (6) holes of door panel.
5. Hold the door panel to the door frame with four (4) screws.
6. Locate door panel hinge pins into cavity hinge location
holes.
7. Re-install choke cover  to door panel by clipping into
position.
Note: After any service to the door;
(A) Make sure that door sensing switch and primary
latch switch are operating properly. (Refer to chapter
"Test Procedures".).
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards. (Refer to
Microwave Measurement Procedure.)
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through latch
holes and that latch head goes through centre of latch
hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Check for microwave leakage around door with an
approved microwave survey meter.  (Refer to Microwave
Measurement Procedure.)
Note:
Figure C-6. Door Replacement
NOTE: When carrying out any repair to the door,
do not bend or warp the slit choke (tabs on
the door panel assembly) to prevent
microwave leakage.
Door frame
Choke cover
Putty knife
PIN
PIN
OVEN HINGE
CHOKE COVER
DOOR
PANEL
DOOR SUB 
ASSEMBLY
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
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