24
R-120DB
R-120DK
R-120DR
R-120DW
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 1.5 mm 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.
5. Re-install outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads from the switches.
5. Remove two (2) screws holding latch hook to oven
flange.
6. Remove latch hook assembly from oven flange.
7. To remove the switch.
7-1. Push outward on the tab that is holding the switch, and
turn the switch so that the pole is on the axis.
7-2. Pull out the switch from the latch hook. Do not break the
pole or tab of the latch hook.
7-3. Now the switch is free.
Reinstallation
1. Re-install each switch in its place. The secondary interlock
switch is in the lower position and the monitor switch is
in the middle position. The door sensing switch is in the
upper position.
2. Re-connect wire leads to each switch. Refer to chapter
"Pictorial Diagram".
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Make sure that monitor switch is operating properly and
check continuity of the monitor circuit. Refer to chapter
"Test Procedure", and Adjustment Procedure below.
Figure C-6. Latch Switch Adjustments
Figure C-5. Latch Switch Removal
DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
Latch heads
Latch hook
Door
Door sensing
switch
Monitor
switch
Secondary
interlock
switch
Shaft
Table
Center of
bracket
Latch hook
Door sensing
switch
Monitor
switch
Secondary
interlock
switch
Pole
Pole
Pole
Tab
10.Reinstall the barrier to the oven cavity by fitting the hooks
of the barrier into the hols of the rear side of oven cavity.
11.Reinstall all wire leads released from the hole of the fan
duct.
12.Connect the wire leads to the fan motor, power supply
cord, H.V. capacitor, magnetron, referring to the pictorial
diagram.
