Service manual

26
R-204EWA
DOOR REPLACEMENT
DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
1. Disconnect the power supply cord and 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 the latch hook to the
flange of the oven front face.
5. With the 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 horizontal position of
the latch hook should be adjusted so that the monitor
switch is activated with the door closed. The vertical
position of the latch hook should be adjusted so that the
door sensing switch and the secondary interlock switch
are activated with the door closed.
6. Secure the screws 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 position.
After adjustment, make sure of the following.
1. In and out play of the 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 door
toward the oven face. Both results (play in the door)
should be less than 0.5mm.
2. The contacts of door sensing switch and secondary
interlock switch open within 1.6mm gap between right
side of cavity face plate and door when door is open.
3. The monitor switch contacts close when the door is
opened.
4. Re-install outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)
Figure C-6. Latch Switch Adjustments
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Re-install the control panel assembly to the oven cavity
front flange.
5. Re-connect wire leads to the control unit. Refer to
chapter "Pictorial Diagram".
6. Make sure that monitor switch is operating properly and
check continuity of the monitor circuit. Refer to chapter
"Test Procedure", and Adjustment Procedure below.
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 corner portion of door
panel as shown in Figure C-7 to free engaging parts.
4. Pry the choke cover by inserting a putty knife in order
shown in figure C-7.
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.
Figure C-7. Door Disassembly
7. Release two (2) pins of door panel from two (2) holes of
Figure C-5. Latch Switch Removal
Latch Hook
Door
Sensing
Switch
Monitor
Switch
Pole
Pole
Bar
Outward
Outward
Tab
Tab
Secondary
Interlock
Switch
Latch Heads
Latch Hook
Door
Door
Sensing
Switch
Monitor
Switch
Secondary
Interlock
Switch
1
2
3
4
5
6
7
8
9
0
q
w
Putty Knife
Door Frame
Choke Cover