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High Voltage Capacitor; High Voltage Diode; Main Relay And Power Control Relay; Adjustment Of Primary Switch, Door Sensing Switch And Monitor Switch - Samsung CK135 Service Manual

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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. 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.

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 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 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

For continued protection against radiation hazard, replace parts in accordance w ith the w iring diagram and be sure to use the
correct part number for the follow ing sw itches: Primary and door sensing sw itches, and the interlock monitor sw itch (replace all
together). Then follow the adjustment procedures below . After repair and adjustment, be sure to check the continuity of all
interlock sw itches and the interlock monitor sw itch.
1. When mounting Primary switch and Interlock
Monitor switch to Latch Body, consult the
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
5. Confirm that the gap between the switch
housing and the switch actuator is no more than
0.5mm when door is closed.
Body Latch
Primary sw itch
M onitor sw itch (COM -NC)
Door Sensing S/ W
Primary Interlock Sw itch
Interlock M onitor
Sw itch
Lever Sw itch
Door Sensing
Sw itch
Door Open
Door Closed
Samsung Electronics


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