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This page includes the brands:
Kenmore (Sears) - Montgomery Wards
Page 1

Copyright © 1998-2013 J. Carlton Gallawa
All Rights Reserved Worldwide
UPDATED JUNE 2012
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Instructions on How To Diagnose and Repair Microwave Ovens

    FREE Super Microwave Oven Troubleshooter
    PUZZLED by microwave repair? Fix any microwave oven with this new FREE troubleshooting guide
  1. After reading the safety precautions , find the brand and model number, or the number closest to the model you are repairing.
  2. Find the symptom(s) that most closely match the symptom(s) being displayed by the oven you are repairing.
  3. Follow the specific troubleshooting and/or repair instructions to complete the repair. Click on highlighted text for a detailed explanation of that procedure.
  4. Since this database is constantly being updated and appended, if you don't find what your looking for, try again at a later time.
  5. Click here    if you would like to be notified by e-mail when this page is updated. 
Please Note:
  • The manufacturers' part numbers and prices listed here are subject to change without notice.
  • The individual model numbers are not necessarily arranged in numerical order
We hope that you find the information here helpful ...

Important Safety Information

microwave oven safety precautions Repairing a microwave oven is a dangerous task. For your personal safety, please do not proceed unless you fully understand and are prepared to follow carefully these appropriate safety precautions .

Disclaimer: The author assumes no liability for any incidental, consequential or other liability from the use of this do good work information. All risks and damages, incidental or otherwise, arising from the use or misuse of the information contained herein are entirely the responsibility of the user.  Although careful precaution has been taken in the preparation of this material, we assume no responsibility for omissions or errors.

Copyright © 1996-2012 by J. Carlton Gallawa
All Rights Reserved Worldwide
© Copyright Information


MICROWAVE OVEN REPAIR CASE HISTORY DATABASE (CONT'D)

KENMORE (Sears)
Model: 564.9998210
Symptom: Panel locked up.
Problem: Open capacitor C1 on printed circuit board Repair:Replace defective capacitor C1, 47MFD 100V
KENMORE (Sears)
Model: 564.9998210
Symptom: No heat
Problem: Open resistor in triac drive circuit caused by erratic operation of opto-coupler (PH1 or IC1)
Solution: Replace opto-coupler (or photo-coupler), part # 409-053-9501 and 220 ohm, 1 watt coupling resistor. Finally apply non-conductive sealer to pins of opto-coupler to prevent moisture, or roaming nocturnal visitor, from causing further erratic operation.
KENMORE (Sears)cavity lip illustration
Model: 401.8912980
Symptom: Arcing from inside the cooking compartment
Problem: Accumulation of food and cooking debris beneath front cavity lip.
Solution: Thoroughly clean all debris and carbon build up from under cavity lip (use a tool such as a plastic knife to penetrate underneath the lip opening and clear out all burned-on debris. Then use light sand paper to sand away any carbon build up. Finally, install a cavity lip protector, Amana part # R0803571. Price: about $8.00
KENMORE (Sears)
Model: 401.8934980
Symptom: Control panel intermittently locks up and will not program
Problem: Cracked solder joint at Crystal, XL1.
Solution: Repair cracked solder joint
KENMORE (Sears)
Model: 564.8598410
Symptom: None of the pads work except "fan" and "light"
Problem: Defective control panel and low voltage transformer
Solution: Replace control panel, part # 12359R. Price:$100.91. Also replace low voltage transformer, part # 12623. Price:$17.49
KENMORE (Sears)
Model: 564.8878420
Symptom: No heat and makes buzzing noise
Problem: Shorted high-voltage diode
Test: High Voltage Diode Test
Solution: Replace shorted diode. This diode is located inside of the high voltage capacitor. So, the entire capacitor w/diode assembly must be replaced. Price:$about $38.00
KENMORE (Sears)
Model: 564.9998010
Symptom: The control panel counts down, but nothing else happens
Problem: The plastic interlock switch actuator on the upper interlock switch has broken
Solution: Remove and disassemble the interlock switch assembly. Locate the small rectangular plastic lever that is used to actuate the interlock switch. Replace this latch lever, part # 11090. Price:about $1.00
KENMORE (Sears)
Model: 564.9998210
Symptom: The door must be slammed closed before the microwave will work
Problem: Defective upper door interlock switch
Test: Interlock Switch Test
Solution: Replace upper interlock switch assembly
Note: Generic interlock switches are available at appliance parts suppliers. Price, about $6.00. Be sure to match terminal arrangement, and current and voltage rating
KENMORE (Sears)
Model: 565.8904380
Symptom: Arcing and sparking in the bottom
Problem: Bits of food or other cooking debris have lodged beneath the coupling. After repeated exposure to microwave energy, the cooking residue breaks down into carbon (which is a conductor) and arcing occurs.
Solution: Clean out all residual grease and cooking debris. Remove all traces of the blackened residue (carbon) from the oven floor. Replace the coupling. Available at Sears for about $5.00
KENMORE (Sears)
Model:566.8844780 Dead when went to use
Problem: Weakened fuse clips in the fuse receptacle causing fuse to melt due to resistive heat. Usually indicated by a bead of solder leaching out from either endcap , and/or evidence of overheating (or burned spot) at the endcap, fuse clip, or terminal connection
Solution: Replace 15 amp fuse (about $1.00) and receptacle (about $2.00)
Additional Inf: Generic fuse holders are available at appliance and electronic part suppliers
KENMORE (Sears)
Model: 721.18815181
Symptom: Oven went dead shortly after starting cook cycle
Problem: Weakened fuse clips in the fuse receptacle are causing the fuse to melt due to resistive heat. This is usually indicated by a bead of solder leaching out from either endcap , and/or evidence of overheating (burned spot) at the terminal connection
Solution: Replace 15 amp fuse (about $1.00) and receptacle (about $2.00).
Additional Info:Generic fuse holders are available at appliance and electronic part suppliers.
LITTON
Model: 1054.000
Symptom: Electrical burning smell during cook
Problem: Triac assembly is breaking down
Test: Triac Test
Solution: Replace triac. Part # M16D93. Price $35.00 and climbing
LITTON
Model: 1420.002
Symptom: Heard a noise then smelled electrical burning
Problem: Shorted high voltage rectifier
Test: High Voltage Diode Test
Solution: Replace shorted high voltage diode (rectifier). Generic replacement available at appliance parts suppliers for about $10.00 to $12.00
LITTON
Model: 1520.000
Symptom: No heat
Problem: Defective heat control module
Solution: Replace the heat control module. Part # M22D34. Possibly includes a dud value (e.g., part costs $115.00 + 25.00 [dud value]=$140.00. Defective [dud] part needs to be returned to redeem the $25.00)
LITTON
Model: 1580.000
Symptom: Works normally for awhile, then shuts off
Problem: Deteriorated connections at interface board
Solution: Clean the interface board edge connector and pins
LITTON
Model: 70-50.08
Symptom: Broken inner-door window
Problem: Stalled stirrer motor causing direct beams of energy to strike the inner door.
Repair: Replace stirrer motor, part # M12D5 and inner door glass, part # M51D1.
Additional info: On earlier models (before s/n *) stirrer blade should be upgraded to newer style, part # M44D13. Note:If stirrer motor is not defective, the upgraded stirrer blade may be all that is needed.
LITTON
Model: K-80/50.000, K-80/50.001
Symptom: When the door is opened, the oven powers up to the idle mode as normal (blowers, lamp, stirrer motor operating). However, when the door is closed, the oven will not stay in the idle mode as it should, rather it reverts back to the standby mode (nothing operating)
Problem: Although the problem would appear to be in the control panel, the failure is actually an opened secondary winding in the low-voltage transformer.
Test: Low Voltage Transformer Test
Solution: Replace low voltage transformer. Amana part # 45507P01. Price:about $30.00
LITTON
Model: 2052.000
Symptom: No heat
Problem: Auxiliary (power) Controller failing to provide primary voltage to the high voltage transformer.
Solution: Replace controller, part # M22D52 (probably subbed to new number). Price $80.00 $100.00 with $10.00 dud value.

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Parts Suppliers and Manufacturer Contacts

ContactYou can contact these parts suppliers and microwave oven equipment manufacturers directly for replacement parts, product literature, dealer locations, technical assistance, etc. Please e-mail additions or corrections to: j.gallawa@cox.net

Selection Keypad Microtech Home Page Important Safety Information Samsung through Whirlpool Panasonic through Quasar Kenmore through Montgomery Wards Amana through JCPenney GlossaryGlossary of Electronic and Microwave Oven Related Terms
EMAILSubmit your own repair tip j.gallawa@cox.net 


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Unless otherwise noted, all materials at this cite (including without limitation all text, html markup, graphics, and graphic elements) are copyrighted ©, 1989-2012 by J. Carlton Gallawa. The material available through this site may be freely used for attributed noncommercial educational purposes only. We ask that due credit and notification be given the author.

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Disclaimer: The author assumes no liability for any incidental, consequential or other liability from the use of this information. All risks and damages, incidental or otherwise, arising from the use or misuse of the information contained herein are entirely the responsibility of the user. Although careful precaution has been taken in the preparation of this material, we assume no responsibility for omissions or errors.

©1998-2013 J. Carlton Gallawa . All Rights Reserved Worldwide
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