Microtech © 1998-2009 J. Carlton Gallawa All Rights Reserved Worldwide Last updated 11/2007

This page includes the brands: Kenmore (Sears) to Montgomery Wards Page 1 Please note that the FULL VERSION of the FixFinder Database is currently being updated.

Instructions for Troubleshooting and Repairing Appliances

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.

• 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

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.

© 1996-2009 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)

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) 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.

To Page 2 (K to O) 
A to J | K to 0 | P to Q | R to Z | Home Page | Safety Information | Back | CD-ROM | Links | FAQ |

Parts Suppliers and Manufacturer Contacts You 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 Glossary of Electronic and Microwave Oven Related Terms  Let us know what you think, or submit your own repair tip j.gallawa@cox.net

Stop and think about what you need to improve your electronics knowledge and job skills. Whether you are a do-it-yourselfer, a technical student, or a seasoned pro, enhancing your expertise makes you far more valuable. In fact, it could affect your entire level of professional success. Microtech's acclaimed "all-in-one" CD-ROM can help give you the edge you need!