DOWNLOAD Sharp R-757M (serv.man10) Service Manual ↓ Size: 82.86 KB | Pages: 6 in PDF or view online for FREE

Model
R-757M (serv.man10)
Pages
6
Size
82.86 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Component replacement and adjustment procedure
File
r-757m-sm10.pdf
Date

Sharp R-757M (serv.man10) Service Manual ▷ View online

R-757M - 24
If the monitored latch switch, stop switch and monitor
switch do not operate properly due to a mis-adjustment,
the following adjustment should be made.
1. CARRY OUT 3D CHECKS.
2. Loosen the two (2) screws holding the latch hook to
the oven cavity front flange.
3. With the door closed, adjust the 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 monitor switch has acti-
vated with the door closed. The vertical position of the
latch hook should be placed where the monitored latch
switch and stop switch have activated with the door
closed.
4. Secure the screws with washers firmly.
5. Make sure of the monitored latch switch, stop switch
and monitor switch operation. If those switches have
not activated with the door closed, repeat step 1 - 4.
After adjustment, make sure of following:
1. In and out play of door remains less than 0.5 mm when
latched position. First check latch hook position, push-
ing and pulling upper position of the door toward the
oven face. The results (play of the door) should be less
MONITORED LATCH SWITCH,  STOP SWITCH AND MONITOR SWITCH ADJUSTMENT
than 0.5mm.
2. The contacts (COM-NO) of monitored latch switch and
stop switch interrupt the circuit before the door can be
opened.
3. The contacts (COM-NC) of the monitor switch close
when 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-7 Latch Switches Adjustment
MONITORED LATCH SWITCH,  MONITOR SWITCH AND STOP SWITCH REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the control panel assembly referring to "CON-
TROL PANEL ASSEMBLY REMOVAL".
3. Disconnect the leads from all switches.
5. Remove the two (2) screws holding the latch hook to
the oven cavity.
6. Remove the latch hook.
7. Push the retaining tab slightly and remove switch.
8. Now the switch(es) is free.
Figure C-6. Switches
Stop Switch
Monitor Switch
Monitored 
Latch Switch
Latch Hooks
Stop Switch
Monitor 
Switch
Monitored
Latch 
Switch
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
1. CARRY OUT 3D CHECKS.
2. Remove the one (1) screw holding the exhaust duct to
the oven cavity.
3. Remove the exhaust duct from the oven cavity.
4. Remove the two (2) screws holding the two (2) termi-
nals of the main wire harness to the grill heating
element.
GRILL HEATING ELEMENT REMOVAL
5. Remove the two (2) screws holding the two (2) grill
heater angles to the top of the oven cavity.
6. Remove the two (2) grill heater angles from the oven
cavity.
7. Remove the grill heating element from the top of the
oven cavity.
8. Now the grill heating element is free.
R-757M - 25
Pin
Pin
Upper oven hinge
Lower 
oven
hinge
Lower oven
hinge
Choke cover
Door panel
Slit choke
Slit choke
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Pull the door handle to open the door.
3. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-8 to free engaging parts.
4. Release choke cover  from door panel.
5. Now choke cover is free.
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.
Figure C-8. Door Disassembly
6. Release two (2) pins of door panel from two (2) holes
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. Now, door panel is free.
10.Slide latch head upward and remove it from door
frame, releasing latch spring from door frame and
latch head.
Now, latch head and latch spring are free.
11.Remove the two (2) screws holding the door handle
and remove the handle from the door frame.
12.Remove the one (1) screw holding the glass stopper to
the door frame.
13.Remove the glass stopper from the door frame.
14.Slide the front door glass upwards and then leftwards.
15.Remove the door glass from the door frame.
17.Now, the door frame is free
DOOR REPLACEMENT
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
door frame.
2) Slide the front door glass downwards into the door
frame and then rightwards.
3) Re-install the glass stopper to the door frame and
secure with one (1) screw.
Door frame
Choke cover
Putty knife
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
2. Re-install the handle and secure with two (2) screws to
the door frame.
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. Fit the door panel to the door frame with four (4) screws.
5. Insert two (2) pins of door panel on two (2) holes of
upper and lower oven hinges.
6. Re-install choke cover to door panel.
Note:
After any service to the door;
(A) Make sure that the monitor switch, monitored
latch switch and stop switch are operating prop-
erly.
Figure C-9. Door Replacement
R-757M - 25
Pin
Pin
Upper oven hinge
Lower 
oven
hinge
Lower oven
hinge
Choke cover
Door panel
Slit choke
Slit choke
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Pull the door handle to open the door.
3. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-8 to free engaging parts.
4. Release choke cover  from door panel.
5. Now choke cover is free.
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.
Figure C-8. Door Disassembly
6. Release two (2) pins of door panel from two (2) holes
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. Now, door panel is free.
10.Slide latch head upward and remove it from door
frame, releasing latch spring from door frame and
latch head.
Now, latch head and latch spring are free.
11.Remove the two (2) screws holding the door handle
and remove the handle from the door frame.
12.Remove the one (1) screw holding the glass stopper to
the door frame.
13.Remove the glass stopper from the door frame.
14.Slide the front door glass upwards and then leftwards.
15.Remove the door glass from the door frame.
17.Now, the door frame is free
DOOR REPLACEMENT
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
door frame.
2) Slide the front door glass downwards into the door
frame and then rightwards.
3) Re-install the glass stopper to the door frame and
secure with one (1) screw.
Door frame
Choke cover
Putty knife
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
2. Re-install the handle and secure with two (2) screws to
the door frame.
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. Fit the door panel to the door frame with four (4) screws.
5. Insert two (2) pins of door panel on two (2) holes of
upper and lower oven hinges.
6. Re-install choke cover to door panel.
Note:
After any service to the door;
(A) Make sure that the monitor switch, monitored
latch switch and stop switch are operating prop-
erly.
Figure C-9. Door Replacement
R-757M - 25
Pin
Pin
Upper oven hinge
Lower 
oven
hinge
Lower oven
hinge
Choke cover
Door panel
Slit choke
Slit choke
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Pull the door handle to open the door.
3. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-8 to free engaging parts.
4. Release choke cover  from door panel.
5. Now choke cover is free.
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.
Figure C-8. Door Disassembly
6. Release two (2) pins of door panel from two (2) holes
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. Now, door panel is free.
10.Slide latch head upward and remove it from door
frame, releasing latch spring from door frame and
latch head.
Now, latch head and latch spring are free.
11.Remove the two (2) screws holding the door handle
and remove the handle from the door frame.
12.Remove the one (1) screw holding the glass stopper to
the door frame.
13.Remove the glass stopper from the door frame.
14.Slide the front door glass upwards and then leftwards.
15.Remove the door glass from the door frame.
17.Now, the door frame is free
DOOR REPLACEMENT
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
door frame.
2) Slide the front door glass downwards into the door
frame and then rightwards.
3) Re-install the glass stopper to the door frame and
secure with one (1) screw.
Door frame
Choke cover
Putty knife
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
2. Re-install the handle and secure with two (2) screws to
the door frame.
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. Fit the door panel to the door frame with four (4) screws.
5. Insert two (2) pins of door panel on two (2) holes of
upper and lower oven hinges.
6. Re-install choke cover to door panel.
Note:
After any service to the door;
(A) Make sure that the monitor switch, monitored
latch switch and stop switch are operating prop-
erly.
Figure C-9. Door Replacement
Page of 6
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