Microtech
© 1998-2012 J. Carlton Gallawa
All Rights Reserved Worldwide
Last updated 1/2012
Learn the nuts and volts of microwave oven and VCR repair

This page includes case histories of the brands:

Samsung to Whirlpool

Page 1

Instructions On How To Use This Information For Troubleshooting and Repairing Microwave Ovens

  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:
We hope that you find the information here helpful.. .

 Important Safety Information

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 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.

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


MICROWAVE OVEN REPAIR CASE HISTORY DATABASE (CONT'D)

 

SAMSUNG
Model: MV5510, MW 5690
Symptoms: First, arcing occurring while cooking. Now, now heat
Problems: (1) Accumulation of food and cooking debris beneath front cavity lip. (2) In addition, the magnetron filament connectors have loosened and, due to resistive heat, the terminal connections have deteriorated and burned off of the terminals
Solutions: (1) 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 (2) Repair defective terminals as follows: Either (1) Cut away burned wire, clean the magnetron terminals, and replace the slip-on connectors, or (2) Cut away burned wire and connector(s). Clean terminals to prepare for soldering. Solder filament leads directly to magnetron terminals. Be careful not to apply soldering heat any longer than necessary
SAMSUNG
Model: MW5630T
Symptom: Timer counts down, but nothing else operates
Problem: Main relay on printed circuit board is not functioning.
Solution: Remove and disassemble Main Relay. Repair burned contacts.
SAMSUNG
Model: RE-525T
Symptom: Oven went dead between uses
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 Info: Generic fuses and fuse holders are available at appliance and electronic part suppliers.
SAMSUNG
Model: RE-705TC
Symptom: No heat
Problem: Faulty triac
Test: Triac Test
Solution: Replace triac. Universal triac replacements are generally available at appliance and electronic parts suppliers. Price: about $10.00
SANYO
Model: EM2500LA
Symptom: Lights and fan work, but there is no heat, and the smell of hot electrical insulation.
Problem: Shorted high-voltage transformer
Test: High-Voltage Transformer Test
Solution: Replace high-voltage transformer. Price: $90.00 to $120.00
SANYO
Model: EM-2501A
Problem: Shorted high voltage capacitor
Test: High-Voltage Capacitor Test
Solution: Replace the high-voltage capacitor and the line fuse. Universal replacements for both parts are available at appliance parts suppliers. The replacement capacitor should be within 10% of the original capacitor's microfarad (uF) value, and the voltage rating should be equal or higher.
SANYO
Model: EM-2520S, EM-3420A
Symptom: No heat
Problem: Defective triac has damaged the triac-drive circuit on the printed circuit board
Test: Triac Test
Solution: Replace triac (part # 12656, price: about $20.00); also replace the opto-coupler (also called photo-coupler), PH1 or IC1, part # 409-053-9501, and replace the 220 ohm 1 watt coupling resistor. Finally, apply non-conductive sealant, such as GE's RTV-102, to the pins of the opto-coupler to prevent moisture or roaming nocturnal visitor from causing erratic operation
SANYO
Model: EM703T
Symptom: Oven went dead half-way through a cooking cycle
Problem: Weakened fuse clips in the fuse receptacle causing fuse to melt due to resistive heat. Usually indicated by 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 Info: Generic fuses and fuse holders are available at appliance and electronic part suppliers
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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 
microwave oven repair selection keypad

Illustration from THE COMPLETE MICROWAVE OVEN SERVICE HANDOOK
Learn how to do specific repairs on all brands of commercial and microwave ovens

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  • Virtually 1000s of microwave oven repair case histories with factory approved troubleshooting and repair procedures
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Click here for FREE samples of this CDROMTHE COMPLETE MICROWAVE OVEN SERVICE HANDBOOK 2012
Operation, Maintenance, Troubleshooting and Repair
J. Carlton Gallawa
Microtech Home Page Important Safety Instructions Samsung through Whirlpool Panasonic through Quasar Kenmore (Sears) through Montgomery Wards Amana through JCPenney
© 1998-2012 by J. Carlton Gallawa . All Rights Reserved Worldwide
Discover the High-Profit Field of Commercial Microwave Oven Repair