Component Testing Online Training Manual for LG Products - Electric Range Main Menu

COMPONENT TESTING


WARNING!

•    Always disconnect the power cord before servicing the range.

•    Replace all panels and parts before operating the range after repairs.

•    Reconnect all grounding devices, clips, pins, and wires. Failure to do this could result in personal injury, electric shock, or death.

•    Wear gloves to protect your hands from the sharp edges of sheet metal.

•    The most common cause of control failure is corrosion on the connectors. Disconnecting and reconnecting connectors will be an important part of all testing procedures.

•    All tests should be made using a DVM with a sensitivity of 20,000 ohms per volt DC or greater.

•    Resistance checks must be made with the range unplugged and the component disconnected from the circuit.


CONVECTION FAN MOTOR


34_1
Normal resistance is 65 ohms ± 10%.

Replace if not within this spec.

Infinite resistance indicates an open circuit; less than 5 ohms indicates a short.

120 VAC motor



DOOR LOCKING MOTOR


34_2
Normal resistance is 2.6 k ohms ± 10%.

Replace if not within this spec.

Infinite resistance indicates an open circuit; less than 5 ohms indicates a short.

120 VAC motor



MICROWSITCH


35_1
Latch open = continuity.

Latch closed = Infinite resistance.

Be sure the switch is connected correctly.



LOW VOLTAGE TRANSFORMER (LVT)


35_2
Normal resistance is 26 ohms ± 10%. Replace if not within this spec. Primary input is 120 VAC black to white

   Secondary voltages are:
      18 VAC yellow to yellow and
      9 VAC red to red. (See page 44 in the training manual.)



OVEN SENSOR


35_3
Measure when cool. (room temperature of 77° F / 25° C)

Normal resistance is 1.09 k ohms ± 10%.

Replace if not within this spec.



DOOR SWITCH


35_4
Door open (plunger out) = continuity.

Door closed = infinite resistance.



OVEN LAMP


36_1
Normal resistance = less than 5 ohms.

Replace if not within this spec.

120 VAC Lamp (Use 40-watt bulbs.)

CAUTION! The door switch and relay board break the neutral side of the line. A 120 VAC potential to chassis ground exists at all times. Unplug the range to change the bulb.


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