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
Brand: Maytag
Category: Microwave Oven
Type: Service manual
Model: Maytag AMC4080AAB/W/Q/S , Maytag AMC5101AAB/W/Q/S , Maytag AMC5143AAB/W/Q/S , Maytag MMC5080AAB/W/Q/S , Maytag MMC5193AAB/W/Q/S , Maytag UMC1071AAB/W
Pages: 53
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.