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KM-24
MICROHOOD
COMBINATION
JOB AID
Part No. 4322462
FORWARD
This Job Aid will introduce the technician to the Whirlpool MicroHood Combina-
tion (MHC) Oven. This Job Aid is a reference guide for he experienced tech
nician. It is not designed as a replacement to basic training. This Job Aid does
not replace the Service Manual or the Use and Care Guide. It is de signed to be
used in conjunction with these manuals.
OBJECTIVE
The objective of this Job Aid is to have the experienced appliance techni cian
become familiar with the operation and service of the Whirlpool MCH Oven. It
is designed as reference material and is not a replacement for basic training.
WHIRLPOOL CORPORATION assumes no responsibility for any repair
made on our products by anyone other than Authorized Factory Ser-
vice Technicians.
Copyright 1998 Whirlpool Corporation
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TABLE OF CONTENTS
Important Safety Instructions .......................................................................................... Page iv
MicroHood Model Features .............................................................................................. Page 1
The Mounting Bracket ...................................................................................................... Page 2
The Rear Mounting Bracket Latch ................................................................................... Page 3
Blower Venting Positions ................................................................................................. Page 4
The Oven Component Locations ..................................................................................... Page 5
The Humidity Sensor ........................................................................................................ Page 6
The High Limit Thermostat ............................................................................................... Page 7
The Hood Fan Motor ........................................................................................................ Page 8
The Magnetron Cooling Fan Motor .................................................................................. Page 9
The Hood Fan Thermostat & Blower Motor Capacitor ................................................... Page 10
Touch Keypad & Microcomputer Board Test ................................................................. Page 11
Wiring Diagram .............................................................................................................. Page 12
Strip Circuits ................................................................................................................... Page 13
Primary, Monitor, & Secondary Switch Checkout Procedure ......................................... Page 16
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IMPORTANT SAFETY INSTRUCTIONS
WARNING TO SERVICE TECHNICIANS
To avoid possible exposure to microwave radiation or energy, visually check the oven for damage to the
door and door seal before operating any oven. Use a microwave survey meter to check the amount of
leakage before servicing. In the event the R.F. Ieakage exceeds 4 mW/cm at 5 cm, appropriate repair must
be made before continuing to service the unit. Check interlock function by operating the door latch. The
oven cook cycle should cut off before the door can be opened.
The door and latching assembly contains the radio frequency energy within the oven. The door is protected
by three safety interlock switches. Do not attempt to defeat them.
UNDER NO CIRCUMSTANCES SHOULD YOU TRY TO OPERATE THE OVEN WITH THE DOOR
OPEN.