Door Sensing Switch/Secondary Interlock Switch And Monitor Switch Adjustment; Door Replacement - Sharp R-308KK Service Manual

R308KW
[13] DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH
ADJUSTMENT
1. 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, secondary interlock switch and monitor
switch do not operate properly due to a misadjustment, the following
adjustment should be made.
4. Loosen the two (2) screws holding latch hook to the oven cavity
front flange.
5. With door closed, adjust latch hook 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 hook should be less than 0.5mm.
The vertical position of the latch hook should be adjusted so that
the door sensing switch and secondary interlock switch are acti-
vated with the door closed. The horizontal position of the latch hook
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 hook posi-
tion.
2. 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 hook, pushing
and pulling upper portion of door toward the oven face.

[14] DOOR REPLACEMENT

1. REMOVAL
1. Disconnect the power supply cord.
2. 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. Pry the choke cover by inserting a putty knife as shown Figure C-5.
5. Release choke cover from door panel.
6. 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.
7. Release two (2) pins of door panel from two (2) holes of upper and
lower oven hinges by lifting up.
8. Now, door panel is free from oven cavity.
C hoke C over
Figure C-5. Door Disassembly
Door F rame
P utty K nife
11 – 6
Then check lower portion of the latch hook, pushing and pulling
lower portion of the door toward the oven face. Both results (play in
the door) should be less than 0.5mm.
2. The door sensing switch and secondary interlock 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 Micro-
wave Measurement Procedure.)
Door
Latch
Heads
Switch Lever
Figure C-4. Latch Switch Adjustments
9. Release door panel from ten (10) tabs of door frame.
10.Now, door panel with sealer film is free.
11. Tear sealer film from door panel.
12.Now, door panel is free.
13.Slide latch head upward and remove it from door frame with releas-
ing latch spring from door frame and latch head.
14.Now, latch head and latch spring are free.
15.Remove door screen from door frame.
16.Now, door screen is free.
2. REINSTALL
1. Re-install door screen to door frame.
2. Reinstall the latch spring to the latch head. Reinstall the latch
spring to the door frame. Reinstall latch head to door frame.
3. Reinstall door panel to door frame by fitting ten (10) tabs of door
frame to ten (10) holes of door panel.
4. Put sealer film on door panel. Refer to "Sealer Film" about how to
handle new one.
5. Catch two (2) pins of door panel on two (2) hole of upper and lower
oven hinges
6. Re-install choke cover to door panel by pushing.
NOTE: After any service to the door;
1) Make sure that door sensing switch and secondary interlock
switch are operating properly. (Refer to chapter "Test Proce-
dures".).
2) An approved microwave survey meter should be used to
assure compliance with proper microwave radiation emission
limitation standards.
Latch Hook
Door Sensing
Switch
Monitor Switch
Secondary
Interlock Switch