- 10 -
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.
5-4 High Voltage Capacitor
1. Check continuity of the capacitor with the meter set at the highest resistance scale.
2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ.
3. A shorted capacitor will show continuous continuity.
4. An open capacitor will show constant 9MΩ.
5. Resistance between each terminal and chassis should read infinite.
1. When mounting Primary switch and Interlock Moni-
tor switch to Latch Body, consult the figure.
2. No specific adjustment during installation of Pri-
mary switch and Monitor switch to the latch body is
necessary.
3. When mounting the Latch Body to the oven assem-
bly, 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 continu-
ity 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 abil-
ity to secure the switches in place.
Door Open Door Closed
Primary switch
Monitor switch (COM-NC)
Monitor switch (COM-NO)
Door Sensing S/W
∞
0
∞
∞
0
∞
0
0
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 inter-
lock monitor switch (replace all together). Then follow the adjustment procedures below. After repair and adjust-
ment, be sure to check the continuity of all interlock switches and the interlock monitor switch.
Interlock Monitor
Switch
Lever Switch
Door Sensing
Switch
Body Latch
5-5 High Voltage Diode
5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch
Primary
Interlock Switch
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.
5-6 Main Relay and Power Control Relay
