Whirlpool MH9180XL Service Manual page 4

COMPONENT TESTING ........................................................................................................ 5-1
Door Switches .................................................................................................................... 5-1
Touch Panel Continuity ...................................................................................................... 5-2
Stirrer & Turntable Motors ................................................................................................. 5-3
AC Line Filter Capacitor ..................................................................................................... 5-3
Humidity Sensor ................................................................................................................ 5-4
Cavity Thermostats 1, 2, & 3 ............................................................................................. 5-4
Line Fuse & Exhaust Fan Thermostat ............................................................................... 5-5
Exhaust Motor Start Capacitor ........................................................................................... 5-5
Cooling Fan Motor ............................................................................................................. 5-6
Hood Exhaust Fan Motor ................................................................................................... 5-6
Magnetron .......................................................................................................................... 5-7
Magnetron Thermostat ...................................................................................................... 5-7
Inverters ............................................................................................................................. 5-8
DIAGNOSIS & TROUBLESHOOTING ................................................................................... 6-1
Power Output Measurement .............................................................................................. 6-1
Failure Codes .................................................................................................................... 6-1
Display And Power Board Callouts .................................................................................... 6-2
Primary, Secondary, & Monitor Switch Checks ................................................................. 6-3
Touch Panel & Microcomputer Board Test ........................................................................ 6-4
WIRING DIAGRAMS & STRIP CIRCUITS ............................................................................. 7-1
Schematic Diagram ........................................................................................................... 7-1
Wiring Diagram .................................................................................................................. 7-2
Strip Circuits ...................................................................................................................... 7-3
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