Free Microwave Oven Repair Histories For The Brands Panasonic Through Quasar

Microtech

Learn the nuts and volts of microwave oven and VCR repair

This page includes case histories of the brands:

Panasonic to Quasar

Page 2

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

After reading the safety precautions , find the brand and model number, or the number closest to the model you are repairing.
Find the symptom(s) that most closely match the symptom(s) being displayed by the oven you are repairing.
Follow the specific troubleshooting and/or repair instructions to complete the repair. Click on highlighted text for a detailed explanation of that procedure.
Since this database is constantly being updated and appended, if you don't find what your looking for, try again at a later time.
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

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.

MICROWAVE OVEN REPAIR CASE HISTORY DATABASE (CONT'D)

PANASONIC

Model: NN-6371WM

Symptom: Stopped working after lightning storm

Problem: Built-in surge protection on printed circuit board has opened. This circuit consists of a fine foil pattern (or filter coil - depending on the model) that acts to fuse the primary side of the low-voltage transformer.

Solution: Rebuild the surge protection circuit. Replace the varistor

Procedure: Foil Pattern/Filter Coil Repair Procedure

PANASONIC

Model: NN-6653A

Symptom: No heat, and making a low humming sound

Problem: Shorted high voltage diode (rectifier)

Test: High-Voltage Diode (Rectifier) Test

Solution: Replace diode (rectifier), part # A62024000AP

PANASONIC

Model: NN-9507

Symptom: Convection cooking mode does not work

Problem: Defective heater fan motor

Solution: Replace heater fan motor. Part # A41794210AP. Price:$30.92

PORTLAND

Model: MW-1040, MW-9405

Symptom: Stopped heating

Problem: Magnetron filament connectors have loosened and, due to resistive heat, the terminal connections have deteriorated and burned off.

Solution: 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

QUASAR

Model: MQ-6620TW

Symptom: Humming sound coming from the control panel.

Problem: Open capacitor on printed circuit board

Solution: Replace open capacitor:C33, 35v 2200uf

QUASAR

Model: MQ-7700RW, MQ-7757BW, MQ-8768W, MQ-8798H, MQ-8877BW, MQS-1403W

Symptom: No heat. Or, oven counts down but nothing else. Or, starts, then immediately stops

Problem: The slip-on connectors on the upper and/or lower interlock switch have burned loose, possibly damaging the switch.

Test: Interlock Switch Test

Solution: Repair the burned connections by either replacing the slip-on connector(s) or soldering the wire(s) directly to the switch.

Note: If the switch terminal was severely burned, the switch should also be replaced, even if it appears to work normally.

Note: Generic micro-switches rated at 15 or 16 amps with appropriate terminal configuration are available at appliance parts suppliers.

QUASAR

Model: MQS-1106W

Symptom: "Started," then popped and went dead.

Problem: Shorted high voltage capacitor has caused fuse to blow.

Test: High-Voltage Capacitor Test

Solution: Replace shorted 1 Mfd, 2100 VAC capacitor. Install new line fuse.

QUASAR

Model: MQS-1403W

Symptom: No heat

Problem: Shorted high voltage diode (rectifier)

Test: High-Voltage Diode (Rectifier) Test

Solution: Replace diode (rectifier). Suitable generic replacements are available at appliance parts suppliers.

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

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