Microtech © 1998-2002 J. Carlton Gallawa All Rights Reserved Worldwide Last updated 1/2002

This page includes case histories of the brands: Samsung to Whirlpool Page 1

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.

© 1996-2002 J. Carlton Gallawa. All Rights Reserved Worldwide.
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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

To Page 2 (R to Z)

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

Illustration from THE COMPLETE MICROWAVE OVEN SERVICE HANDOOK

If you would like to learn more about repairing commercial and residential microwave ovens and become part of a multi-million dollar service industry, we invite you to take a look at Microtech's powerful new computerized training course. Virtually 1000s of microwave oven repair case histories with factory approved troubleshooting and repair procedures Factory troubleshooting charts, error codes, schematics and diagnostic procedures Touch panel (key pad) matrix diagrams for 100s of brands Hundreds of vividly colored schematics, diagrams, illustrations and photos ease the toughest repair chores. Fully searchable text for quick information gathering All chapters, sections and references are hyperlinked for fast and smooth navigating FREE technical support Full 30-day, no-questions- asked, money-back guarantee

THE COMPLETE MICROWAVE OVEN SERVICE HANDBOOK 2000 Operation, Maintenance, Troubleshooting and Repair J. Carlton Gallawa