18
5. Alignment and Adjustments
5-5 High Voltage Diode
1.
Isolate the diode from the circuit by disconnecting its leads .
2.
With the ohm-meter set at the highest resistance scale, measure across the diode terminals . Reverse the meter
leads and read the resistance . A meter with 6V, 9V or higher voltage batteries should be used to check the front-to
back resistance of the diode (otherwise an infinite resistance may be read in both directions). The resistance of a
normal diode will be infinite in one direction and several hundred KΩ in the other direction.
5-6 Main Relay and Power Control RelayA
1.
The relays are located on the PCB Ass’y . Isolate them from the main circuit by disconnecting the leads .
2.
Operate the microwave oven with a water load in the oven . Set the power level set to high .
3.
Check continuity between terminals of the relays after the start pad is pressed .
5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor
Switch
PRECAUTION
For continued protection against radiation hazard, replace parts in accordance with the wiring diagram
and be sure to use the correct part number for the following switches: Primary and secondary interlock
switches, and the interlock monitor switch (replace all together) . Then follow the adjustment procedures
below . After repair and adjustment, be sure to check the continuity of all interlock switches and the
interlock monitor switch .
1.
When mounting Primary switch and Interlock Monitor
switch to Latch Body, consult the figure.
2.
No specific adjustment during installation of Primary
switch and Monitor switch to the latch body is
necessary .
3.
When mounting the Latch Body to the oven
assembly, adjust the Latch Body by moving it so
that the oven door will not have any play in it . Check
for play in the door by pulling the door assembly .
Make sure that the latch keys move smoothly
after adjustment is completed . Completely tighten
the screws holding the Latch Body to the oven
assembly .
4.
Reconnect to Monitor switch and check the
continuity of the monitor circuit and all latch switches
again by following the components test procedures .
5.
Confirm that the gap between the switch housing
and the switch actuator is no more than 0 .5mm
when door is closed .
6.
Interlock Switch Replacement - When replacing
faulty switches, be sure switch mounting tabs are not
bent, broken or otherwise deficient in their ability to
secure the switches in place .
Interlock Monitor
Switch
Lever Door(B)
Door Sensing
Switch
Body Latch
Primary
Interlock Switch
Door Open Door Closed
Primary Interlock switch
Monitor switch(COM-NC)
Monitor switch(COM-NO)
Door Sensing S/W
(Secondary Interlock S/W)
∞
0
∞
∞
0
∞
0
0
