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Maytag UMC1071AAB/W Service Manual

Download Service manual of Maytag AMC4080AAB/W/Q/S Microwave Oven for Free or View it Online on All-Guides.com. This version of Maytag AMC4080AAB/W/Q/S Manual compatible with such list of devices, as: AMC4080AAB/W/Q/S, AMC5143AAB/W/Q/S, MMC5080AAB/W/Q/S, MMC5193AAB/W/Q/S, UMC1071AAB/W

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Troubleshooting Procedures

©2004 Maytag Services 16022923 Rev. 0 11

Problem Possible Cause Correction

Timer begins

countdown but

microwave does not

oscillate (oven lamp

illuminates, fan

motor engages but

oven does not

produce heat)

Latch switches not aligned properly ................

Open or loose high voltage circuit connection,

including magnetron filament circuit (greater

contact resistance lowers magnetron filament

voltage, resulting in lower magnetron output

and/or intermittent oscillation) .........................

Defective high voltage components

(transformer, capacitor, diode, fuse,

magnetron) ......................................................

Open or loose power relay wiring

Defective primary latch switch

Defective power relay or Assembly PCB ........

• Adjust door and latch switches, replace if

necessary

• Check high voltage circuit connections.

Tighten/reconnect where necessary

• Check measurements on high voltage

components. See test procedure in

Replace component/s if necessary

• Replace Assembly PCB

Oven lamp

illuminates and fan

motor engages

Maladjustment or loose wiring of primary latch

switch

Defective primary latch switch

• Check wiring connections and adjust

door and latch switches. Replace if

necessary.

Timer does not start

once oven is

programmed

Open or loose wiring of secondary interlock

switch

Off-alignment of primary interlock

Defective secondary interlock switch

• Check wiring connections and adjust

door and interlock switches. Replace if

necessary.

Microwave output is

low; oven takes

longer time to cook

food

Decrease in power source voltage..............

Open or loose magnetron filament circuit

(intermittent oscillation)

Aged magnetron

• Consult electrician.

Fan motor engages

when oven is

connected to

electrical source

Loose wiring on door sensing switch ..........

• Check door sensing switch wire.

Oven does not

operate and return

to standby

Defective Assembly PCB ............................

• Replace Assembly PCB

Oven emits loud

noises when

operating

Loose fan/fan motor ....................................

Loose screws on high voltage transformer .

Shorted high voltage diode .........................

• Tighten screws of fan/fan motor.

• Tighten screws of high voltage

transformer.

• Replace high voltage diode.

Turntable motor

does not engage

Open or loose turntable motor wiring ..........

Defective turntable motor

• Check and replace turntable motor, if

necessary.

Oven ceases

operation during

cooking process

Open or loose wiring of primary interlock

switch

• Adjust door and latch switches.

Sparks emitting

during cooking

process

Metallic ware or cooking dishes touching the

oven wall .....................................................

Ceramic ware trimmed with gold or silver

powder

• Remove all cookware trimmed with

metallic substances

Uneven cooking Microware intensity characteristics

• Wrap thinner parts of food with

aluminum foil, plastic wrap or cover with

a lid.

• Stir once or twice while cooking foods

such as soup, cocoa or milk.

Noise emitting from

turntable motor

during operation

Motor

• Replace turntable motor.