Removing The 1100 W Inverter Board - Whirlpool MH9180XL Service Manual

REMOVING THE 1100 W INVERTER BOARD

WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
NOTE: Sharp edges may be present.
1. Unplug the microwave oven or disconnect
the power.
2. Remove the control panel assembly (see
page 4-12 for the procedure).
3. Remove the cooling fan motor (see page
4-16 for the procedure).
NOTE: Make sure to read the "Warnings" on
page 1-7 before you continue.
4. Hold a 20,000Ω (red-black-orange)
2-Watt resistor by the body with a pair of
long nosed pliers, and touch the leads to
the two discharge points on the 1100 W
inverter. Be careful not to touch the bare
resistor leads during this procedure.
Discharge Points
5. Remove the 40 W Inverter Board (see
page 4-19 for the procedure).
6. Remove the exhaust fan thermostat (see
page 4-17 for the procedure).
7. Disconnect the red and white wires from
the exhaust motor start capacitor, the blue
and gray wires from the magnetron ther-
mostat, and the brown, red, and orange
wires from the line fuseholder terminals.
8. Remove the two screws from the front
mounting panel.
Magnetron
Thermostat
(Blu & Gry)
Line
Fuseholder
(Brn, Red,
& Org)
Screw
9. Pull the front mounting panel out the front
of the unit, then remove the wires from the
side of the panel.
Remove
Wires
4-20
Screw
Exhaust
Motor
Start
Capacitor
(Red &
Wht)
Front
Mounting
Panel
Front Mounting Panel