Whirlpool MH9180XL Service Manual page 59

NOTE: Refer to the "Warnings" on page 1-7.
Do not attempt to repair, or make any adjust-
ments to the inverter board.
Check Wiring
1. Unplug the microwave oven or disconnect
the power.
2. Discharge the 1100 W inverter (perform
steps 2 through 4 on page 4-20).
3. Visually inspect inverter board connectors
CN701, CN702, CN703, and E701. Check
for signs of failure due to loose wiring,
unseated connectors, and discoloration
due to overheating.
CN701
(I/O Signal) (120 VAC)
CN703
(High Voltage Output
To Magnetron)
CN702
E701
(Ground)
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.
40 W INVERTER
Refer to page 4-18 for the procedure for servic-
ing the 40 W inverter.
Check Wiring
1. Unplug the microwave oven or disconnect
the power.
2. Visually inspect inverter board connectors
CN1, CN151, CN152, and CN153. Check
for signs of failure due to loose wiring,
unseated connectors, and discoloration
due to overheating.
CN153 & CN152 (12 VDC)
CN151 (Signal Input)
Continued on the next page.
5-9
CN1 (120 VAC Input)