5. Alignment and Adjustments
PRECAUTION
1.High voltage is present at the high voltage terminals during any cook cycle.
2.It is neither necessary nor advisable to attempt measurement of the high voltage.
3.Before touching any oven components or wiring, always unplug the oven from its power source and discharge the high voltage capacitor.
Filament Terminals
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SHV-173EC |
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Secondary |
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Approx. 123 |
Filament |
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Approx.0 |
Primary |
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Approx.1.8 |
Secondary
Primary Terminal
Terminals
5-3 Magnetron |
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1. Continuity checks can indicate only an open |
Magnetron Antenna |
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filament or a shorted magnetron. To diagnose an |
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Gasket Plate |
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open filament or shorted magnetron : |
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2.Isolate the magnetron from the circuit by disconnecting its leads.
3.A continuity check across the magnetron filament terminals should indicate one ohm or less.
4.A continuity check between each filament terminal and magnetron case should read open.
Cooling Fins
Samsung Electronics |
5-1 |
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
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.
Primary Interlock Switch
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Interlock |
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Secondaryr |
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Switch |
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Lever Door(B) |
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Body Latch |
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Door Sensing |
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Switch |
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Door Open |
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Door Closed |
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Primary switch |
∞ |
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Monitor switch (COM-NC) |
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∞ |
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Monitor switch (COM-NO) |
∞ |
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Door Sensing S/W |
∞ |
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5-2 |
Samsung Electronics |
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