30
REV 1 (Apr 2011)
3. Secure latch head (with two (2) mounting screws) to
oven flange.
4. Make sure that the monitor switch is operating
properly
and check continuity of the monitor circuit. Refer to chapter
"Test Procedure" and Adjustment procedure.
DOOR SENSING SWITCH/PRIMARY SWITCH/SECONDARY SWITCH AND MONITOR SWITCH ADJUSTMENT
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
If the door sensing switch, primary switch, secondary switch
and monitor switch do not operate properly due to a misad-
justment, the following adjustment should be made.
4. Loosen the two (2) screws holding latch head to the oven
cavity front flange.
5. With door closed, adjust latch head by moving it back
and
forth, and up and down. In and out play of the door
allowed by the upper and lower position of the latch
head should be less than 0.5mm. The vertical position
of the latch head should be adjusted so that the door
sensing switch, primary switch and secondary switch are
activated with the door closed. The horizontal position of
the latch head should be adjusted so that the plunger of
the monitor switch is pressed with the door closed.
6. Secure the screws with washers firmly.
7. Check the operation of all switches. If each switch has
not activated with the door closed, loosen screw and
adjust the latch head position.
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when
in the latched position. First check upper position of latch
head, pushing and pulling upper portion of door toward
the oven face. Then check lower portion of the latch
Figure C-3. Latch Switch Adjustments
head, pushing and pulling upper portion of door toward
the oven face. Both results (play in the door) should be
less than 0.5mm.
2. The door sensing switch, primary switch and secondary
switch interrupt the circuit before the door can be
opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
DOOR/LATCH HEAD/SPRING REPLACEMENT
REMOVAL
1. Disconnect the power supply cord.
2. Push the open button and open the door.
3. Remove choke cover by inserting a putty knife (thickness
of about 0.5mm) into the gap between the choke cover
and door frame as shown in
Figure C-4
to free engaging
parts.
4. Release two (2) pins of door panel from two (2) holes of
upper and lower oven hinges by lifting up
Figure C-5
.
LATCH HEAD/SPRING REMOVAL
5. Lay door on protected surface, then slide latch head
forward until it clears the center holes that hold the latch
head.
6. Unhook spring from latch head and door frame.
7. The latch head and spring is now free.
RE-INSTALL
1. Hook one end of the latch spring to latch head, then hook
the other end of the spring to door frame spring catch.*
2. With latch spring attached at both ends, extend latch
head forward until it can be inserted into the center holes
that hold the latch head.
3. Check for smooth movement.
4. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges and insert choke cover Figure
C-5.
*NOTE:
Latch head and spring can be installed without removing
the door panel, but if you cannot, remove the six screws
holding the door panel to the frame and remove door panel.
Door Sensing
Switch
Monitor Switch
Switch Lever
Secondary
Switch
Latch Heads
Door
Primary
Switch
Figure C-4. Door/Latch head Replacement
Choke Cover
Door Frame
Putty Knife
Summary of Contents for VMOS200AL
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