Read Sharp R-872M (serv.man3) Service Manual online
R-872M - 27
4. Remove the two (2) nuts holding the bottom heating
element to the oven cavity.
5. Remove the heater cover and the heater packing from
the bottom heating element.
6. Remove the bottom heating element from the oven
cavity .
1. CARRY OUT 3D CHECKS.
2. Remove the control panel assembly referring to "CON-
2. Remove the control panel assembly referring to "CON-
TROL PANEL ASSEMBLY REMOVAL".
3. Remove the open lever from the oven cavity front plate
by removing the control panel assembly.
4. Disconnect the leads from all switches.
5. Remove the two (2) screws holding the latch hook to
5. Remove the two (2) screws holding the latch hook to
the oven cavity.
6. Remove the latch hook.
7. Remove the switch(es) from the latch hook by pushing
7. Remove the switch(es) from the latch hook by pushing
the retaining tab backwards slightly and turning the
switch(es) on the post.
switch(es) on the post.
8. Now the switch(es) is free.
Figure C-5. Switches
MONITORED LATCH SWITCH, MONITOR SWITCH AND STOP SWITCH REMOVAL
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
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.
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 all switches operation. If the latch
5. Make sure of the all switches operation. 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 two (2) screws holding latch hook to
oven cavity front flange and adjust the latch hook
position.
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 two (2) screws holding latch hook to
oven cavity front flange and adjust the latch hook
position.
After adjustment, make sure of following:
1. In and out play of door remains less than 0.5 mm when
latched position. First check the latch hook position,
pushing and pulling upper portion of the door toward
pushing and pulling upper portion of the door toward
MONITORED LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT
the oven face. Then check the lower latch hook posi-
tion, pushing and pulling lower portion of the door
toward the oven face. Both results (play of the door)
should be less than 0.5mm.
tion, pushing and pulling lower portion of the door
toward the oven face. Both results (play of the door)
should be less than 0.5mm.
2. The stop switch interrupt the circuit before the door
can be opened.
3. When the door is opened the contacts (COM-NC) of
the monitor switch and monitored latch switch close.
And the contacts (COM-NO) of their switches open.
And the contacts (COM-NO) of their switches open.
4. When the door is closed the contacts (COM-NC) of the
monitor switch and monitored latch switch open. And
the contacts (COM-NO) of their switches close.
the contacts (COM-NO) of their switches close.
5. Re-install outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)
meter. (Refer to Microwave Measurement Procedure.)
Figure C-6 Latch Switches Adjustment
MONITOR SWITCH
STOP SWITCH
MONITORED
LATCH SWITCH
LATCH SWITCH
Tab
Post
Post
Post
Tab
Tab
DOOR
LATCH HOOK
MONITOR SWITCH
MONITORED
LATCH SWITCH
LATCH SWITCH
STOP SWITCH
OPEN LEVER
LATCH
HEADS
HEADS
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
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