KitchenAid KSM75 Service Manual page 37

Stand Mixer Service Manual LIT4177310-C
PROBLEM SOLVING QUICK REFERENCE GUIDE
MIXER PROBLEM
Switch lever clicks, but mixer will not
run or buzz.
Electrical shock to operator.
Mixer will not run although switch clicks,
motor buzzes and smokes.
Bad sparking at contact points or
burned contacts on switch.
Bad sparking at motor brushes.
Mixer runs on high speed only.
KITCHENAID
MOST LIKELY CAUSE(S)
Open electrical circuit.
Bare lead touching the inside
of the motor housing.
Frozen bearing.
Wired wrong.
Faulty Phase control.
Worn motor brushes.
Rough commutator.
Faulty armature or shorted field.
Phase control defective.
Appendix B-3
2005 KitchenAid
WHAT TO DO / CHECK
Progressively disassemble the speed control
mechanism plus the motor and perform the
following checks until the open circuit is found.
Look for:
Faulty plug on power cord.
Faulty power cord.
Bad connection in speed control plate.
Faulty speed control plate.
Wire lead clip detached from brushholder.
Bad connection between field and cord.
Open circuited armature.
Open circuited field
Incorrect brush orientation.
Disconnect from power source. Turn the switch on
and check for ground with a test lamp. Touch one
lead of the test lamp to a prong on the plug on the
power cord and the other lead to an unpainted
surface on the motor housing. If the lamp lights, the
mixer is grounded. Examine all the wiring in the
order of its accessibility, until the grounded wire is
found. If the mixer has a radio interference,
condenser wired between a stator lead and power
cord lead, remove it from the circuit.
Examine all the bearings in the order of their
accessibility, until the frozen bearing is found.
Check wiring.
Replace phase control.
Remove motor brushes and check that they are
not worn to less than 5/16". Replace with new
brushes if excessively worn.
Remove and replace armature. Check brushes
for wear.
Dissemble and check motor.
Replace phase control.