Sharp R-8470, Service Manual

Page: 34 / 54

UPPER/LOWER LATCH SWITCHES AND MONITOR SWITCH ADJUSTMENT
If the upper and lower latch switches and monitor
switch do not operate properly due to a
mis-adjustment, the following adjustment should be
made.
1. Loosen the one (1) screw holding the upper latch
hook to the oven cavity front flange and the one (1)
screw holding the lower latch hook to the same
flange.
2. With the door closed, adjust the lower latch hook
by moving it back and forward and then adjust the
upper latch hook by moving it back and forward,
or up and down.
In and out play of the door al-
lowed by the upper and lower latch hooks should
be less than 0.5 mm. The vertical position of the
upper latch hook should be placed where the upper
latch switch and monitor switch have activated with
the door closed. Vertical adjustment of the lower
latch hook is not possible.
3. Secure the screws with washers firmly.
4. Now, make sure of the upper latch switch opera-
tion. If the upper latch switch has not activated with
the door closed, loose the one (1) screw holding
the upper latch hook to the oven cavity front flange
and adjust the upper latch hook position.
After the adjustment, make sure of the following
points:
1. The in and out play of the door remains less than
0.5 mm at latched position. First check the upper
latch hook position, pushing and pulling the upper
portion of door toward the oven face. Then check
the lower latch hook position, pushing and pulling
the lower portion of door toward the oven face.
Both results (plays of the door) should be less than
2. The upper and lower latch switches interrupt the
circuit before the door can be opened.
3. The monitor switch contacts close when the door
is opened.
4. Re-install the outer case and check for microwave
leakage around the door with an approved micro-
wave survey meter. (Refer to Microwave Measure-
ment Procedure.)