Parts for Kenmore 911.9871191 (9119871191, 911 9871191): Microwave Module Section Parts

This microwave high-voltage capacitor stores and releases energy in the high-voltage circuit to power the magnetron. Replacing a failed capacitor helps restore proper heating and protects other components in the high-voltage system.

• Works with the transformer and high-voltage diode to supply the magnetron with the required voltage
• Failure may result in the unit running but not heating
• Shorted capacitors can blow the internal fuse or trip a breaker; opens may cause loud humming or buzzing
• Visible swelling or leakage on the capacitor body are common failure signs

• Unplug the microwave; capacitors can retain a dangerous charge even when unplugged—discharge using an appropriate, insulated method before servicing
• Note wire positions and terminal orientation; transfer any mounting hardware from the original part
• Mount securely and route wires to avoid pinching

This magnetron generates microwave energy to heat food in compatible countertop and over-the-range microwaves. Replacing a worn magnetron restores cooking power and helps eliminate uneven heating or failure to heat. What it does:

• Converts high-voltage electrical power into microwave radiation used to cook and reheat food
• Common symptom: oven runs but food doesn't heat or heats very slowly
• May also be needed if you notice loud buzzing, arcing, or burning odors during operation
• Works with the microwave's high-voltage system; other components may also need inspection

• One magnetron (single unit as shown)

• Disconnect power and discharge the microwave's high-voltage capacitor before servicing
• Inspect surrounding parts (waveguide, diode, capacitor, and cooling fan) for damage during replacement
• Use only the correct replacement part number to ensure proper fit and safe operation

This high-voltage rectifier diode is used in the microwave's high-voltage circuit. It converts AC to DC so the magnetron can produce heat. A failed diode can cause no heat, loud humming, or a blown fuse when starting. What it does:

• Rectifies high-voltage AC to DC to power the magnetron
• Blocks reverse voltage in the HV circuit
• Common failure symptoms can include: runs but doesn't heat; loud hum then shutdown; line fuse blows at startup

• 1 high-voltage diode

• Unplug the microwave and properly discharge the high-voltage capacitor before servicing—dangerous voltage can remain even when unplugged
• Match diode orientation/polarity to the original and ensure a solid chassis ground connection where used
• Route leads and reinstall any clamps/insulators exactly as found; keep wiring clear of sharp edges and hot components
• If the original diode failed, inspect the HV capacitor and transformer for related issues before reassembly