High Voltage Capacitor; High Voltage Diode; Main Relay And Power Control Relay - Samsung CE979GSE Service Manual

Alignment and Adjustments

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. Shorted capacitor indication: continuity.
4. Open capacitor noication constant 9MΩ.
5. Resistance between each terminal and chassis should read infinite.

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 reverse direction.

5-6 Main Relay and Power Control Relay

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. Set the power level 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
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 is necessary 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 has vo "play". Check for play
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 re-check that
the the monitor circuit and all latch switches are
secured.(see 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.
5-2
Precaution
Body Latch
Primary switch
Monitor switch (COM-NC)
Monitor switch (COM-NO)
Door Sensing S/W
Primary Interlock Switch
Interlock Monitor
Switch
Guide switch
Lever Door(B)
Door Sensing
Switch
Door Open Door Closed
∞
0
∞
0
∞
0
∞
0
Samsung Electronics