Sharp R-340A, Service Manual

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R-340A
22
1ST. LATCH SWITCH, 2ND. INTERLOCK RERAY CONTROL SWITCH AND MONITOR SWITCH ADJUSTMENT
If each switch does not operate properly due to a
misadjustment, the following adjustment should be made.
1. Loosen the two (2) screws holding latch hook to the
oven cavity front flange.
2. 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 1st.
latch switch 2nd. interlock relay control switch are
activated with the door closed. The horizontal position
of the latch hook should be adjusted so that the monitor
switch is activated with the door closed.
3. Secure the screws with washers firmly.
4. Check the operation of all switches. If any switch has
not activated with the door closed, loosen screw and
adjust the latch hook 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 hook, pushing and pulling upper portion of door
toward the oven face. 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 1st. latch switch and 2nd. interlock relay control
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.)
Latch Hook
2nd. Interlock
Relay Control
Switch
Monitor
Switch
Switch
Lever
Latch
Heads
Door
1st. Latch
Switch
Figure C-7. Latch Switch Adjustments
REMOVAL
1. Disconnect oven from power supply.
2. Push the open button and open the door slightly.
3. Insert an putty knife (thickness of about 0.5mm) into the
gap between the door stopper and the choke cover to
free engaging parts as shown in Figure C-8.
4. Try the principles of the lever and lift up the door
stopper.
5. Now, the door stopper is free from the door assembly.
6. Release two (2) pins of door panel from two (2) holes
of upper and lower oven hinges by lifting up.
7. Now, door panel with door frame is free from oven
cavity.
8. 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.
9. Try the principles of the lever and lift up the choke cover
by inserting a putty knife as shown Figure C-8.
10.Release choke cover from door panel.
11.Now choke cover is free.
4
3
2
1
5
6
7
9
8
10
11
12
13
Choke Cover
Door Frame
Putty Knife
Door stopper
Figure C-8. Door Disassembly
12.Release door panel from nine (9) tabs of door frame by
sliding door panel downward.
13.Now, door panel with sealer film is free.
14.Tear sealer film from door panel.
15.Now, door panel is free.
16.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
17.Now, latch head and latch spring are free.
18.Remove door screen from door frame as follows.
1) Turn the door frame over. Refer to Figure
1
.
2) Push the upper right cover of the door screen by
your finger from the front side of the door frame.
And slide the door screen over the corner tab until
the upper and right edges of the door screen touch
the tabs of the door frame. Refer to Figure
2
.
Tabs
Door frame
Door
screen
Tabs
Tab
(Conner)
1 2
View; back side of door frame
3) Turn the door frame back. Refer to Figure
3
.
4) Push the lower right corner of the door screen by
your finger from the back side of the door frame.
And slide the door screen clockwise. Refer to
Figure
3
.
5) Pull out the door screen toward the lower right
corner of the door frame. Refer to Figure
4
.
DOOR REPLACEMENT