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Touchpad won't operate - Dacor DMT2420 1200 Watts Microwave Oven

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Not all buttons work on touchpad


There will be a problem with the touchpad membrane, usually this is usually repaired by replacing the complete touchpad facia or front control panel.

Nov 10, 2013 | Goldstar MV-1515 Microwave Oven

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Troubleshooting Guide


  • Problem: Totally dead oven.
    Possible causes:
    1. No power to outlet (blown fuse or tripped breaker or GFCI).
    2. Blown main fuse - likely due to other problems.
    3. Open thermal protector or thermal fuse.
    4. Defective controller or its power supply.
    5. Clock needs to be set before other functions will operate (some models).

  • Problem: Totally dead oven after repair.
    Possible causes:
    1. Cabinet screws replaced in incorrect location (safety interlock not engaged).
    2. Any number of screwups. :)

  • Problem: No response to any buttons on touchpad.
    Possible causes:
    1. Door is not closed (some models).
    2. You waited to long (open and close door to wake it up).
    3. Controller is confused (pull plug for a minute or two to reset).
    4. Defective interlock switches.
    5. Faulty controller or its power supply.
    6. Touchpad or controller board contaminated by overenthusiastic cleaning.
    7. Defective/damaged touchpad.

  • Problem: Oven runs when door is still open.
    Possible causes:
    1. Damaged interlock assembly.
    2. Cooling fans (only) running due to bad sensor or still warm.

  • Problem: Oven starts on its own as soon as door is closed.
    Possible causes:
    1. Defective triac or relay.
    2. Controller is confused (pull plug for a minute or two to reset).
    3. Defective controller or its power supply.
    4. Touchpad or controller board contaminated by overenthusiastic cleaning.
    5. Defective/damaged touchpad.

  • Problem: Oven works but display is blank.
    Possible causes:
    1. Defective controller or its power supply.
    2. Broken display panel.
    3. Oven needs to be reset (pull plug for a minute or two to reset).

  • Problem: Whacked out controller or incorrect operation.
    Possible causes:
    1. Previous or multipart cook cycle not complete.
    2. Controller is confused (pull plug for a minute or two to reset).
    3. Defective controller or its power supply.
    4. Touchpad or controller board contaminated by overenthusiastic cleaning.
    5. Defective/damaged touchpad.
    6. Defective sensor (particulalry covection/mirowave combos).

  • Problem: Erratic behavior.
    Possible causes:
    1. Previous or multipart cook cycle not complete.
    2. Bad connections in controller or microwave generator.
    3. Faulty relay - primary (or HV side, much less commonly used).
    4. Defective controller or its power supply.
    5. Bad contacts/connections on mechanical timers. Intermittent fuse.
    6. Power surge at start of cook cycle confusing controller.
    7. Microwave (RF) leakage into electronics bay.

  • Problem: Some keys on the touchpad do not function or perform the wrong action.
    Possible causes:
    1. Touchpad or controller board contaminated by overenthusiastic cleaning.
    2. Defective/damaged touchpad.
    3. Controller is confused (pull plug for a minute or two to reset).
    4. Faulty controller.

  • Problem: Microwave oven does not respond to START button.
    Possible causes:
    1. Defective START button.
    2. Faulty interlock switches.
    3. Door is not securely closed.
    4. Faulty controller.
    5. You waited too long - open and close door to wake it up!

  • Problem: No heat but otherwise normal operation.
    Possible causes:
    1. Blown fuse in HV transformer primary circuit or HV fuse (if used).
    2. Bad connections (particularly to magnetron filament).
    3. Open thermal protector or thermal fuse.
    4. Open HV capacitor, HV diode, HV transformer, or magnetron filament.
    5. Shorted HV diode, HV capacitor (will blow a fuse), or magnetron.
    6. Defective HV relay (not commonly used).

  • Problem: Timer and light work but no heat, cooling fan, or turntable rotation.
    Possible causes:
    1. Defective (lower) door interlock switch or door not closing fully.
    2. Faulty relay or triac.

  • Problem: Fuse blows when closing or opening door:
    Possible causes:
    1. Defective door interlock switch(s).
    2. Interlock switch knocked out of position.
    3. Misaligned door.

  • Problem: Loud hum and/or burning smell when attempting to cook.
    Possible causes:
    1. Shorted HV diode, magnetron.
    2. Burnt carbonized food in or above oven chamber.
    3. Shorted winding in HV transformer.
    4. Frayed insulation on HV wiring.

  • Problem: Arcing in or above oven chamber.
    Possible causes:
    1. Burnt carbonized food deposits.
    2. Exposed sharp metal edges.

  • Problem: Fuse blows when initiating cook cycle.
    Possible causes:
    1. Defective interlock switches or misaligned door.
    2. Shorted HV capacitor.
    3. Shorted HV diode.
    4. Shorted magnetron (probably won't blow main fuse but HV fuse if used).
    5. Defective triac.
    6. Old age or power surges.
    7. Defective HV transformer.
    8. Short in wiring due to vibration or poor manufacturing.

  • Problem: Fuse blows when microwave shuts off (during or at end of cook cycle).
    Possible causes:
    1. Defective triac (doesn't turn off properly).
    2. Defective relay.
    3. Shorting wires.

  • Problem: Oven heats on high setting regardless of power setting.
    Possible causes:
    1. Faulty primary relay or triac or HV relay (not commonly used).
    2. Faulty controller.

  • Problem: Oven immediately starts to cook when door is closed.
    Possible causes:
    1. Shorted relay or triac.
    2. Faulty controller.

  • Problem: Oven heats but power seems low or erratic.
    Possible causes:
    1. Low line voltage.
    2. Magnetron with low emission.
    3. Faulty controller or set for wrong mode.
    4. Stirrer (or turntable) not working.
    5. Intermittent connections to magnetron filament or elsewhere.
    6. Faulty primary relay or triac or HV relay (not commonly used).

  • Problem: Oven heats but shuts off randomly.
    Possible causes:
    1. Overheating due to blocked air vents or inoperative cooling fan.
    2. Overheating due to bad magnetron.
    3. Bad connections in controller or microwave generator.
    4. Faulty interlock switch or marginal door alignment.
    5. Faulty controller.
    6. Overheating due to extremely high line voltage.
    7. Stuck stirrer fan resulting hot spots detected by sensors.

  • Problem: Oven makes (possibly erratic) buzzing noise when heating.
    Possible causes:
    1. Fan blades hitting support or shroud.
    2. Vibrating sheet metal.
    3. Vibrating transformer laminations.
    4. Turntable or stirrer hitting some debris.

  • Problem: Oven light does not work.
    Possible causes:
    1. Burnt out bulb :-).
    2. Bad connections.

  • Problem: Fans or turntables that do not work.
    Possible causes:
    1. Gummed up lubrication or bad motor bearing(s).
    2. Loose or broken belt.
    3. Bad motor.
    4. Bad thermostat.
    5. Bad connections.

on Mar 30, 2008 | Kenmore 80412 Microwave Oven

1 Answer

Microwave does not complete operation. defaults to 88888


please make this test and fix it. God bless you

  1. ain control boardIf your microwave runs for a few seconds and stops, the first thing to check is the main control board to ensure that a shortage has not occurred. If the part is defective then it will need to be replaced to prevent continual shut offs. If this is not the issue, the next step would be to check for a faulty touchpad.
  2. Touchpad/Control panelIf the control board is not the issue and your microwave continues to shut off after running for only a few seconds, the next thing to check is your touchpad, which is also known as a control panel. Although uncommon for this issue, symptoms are usually that the display and some buttons are working properly; however, when selected some buttons are not functioning. If this is the case the touchpad will need to be replaced.

Oct 27, 2013 | Tappan TMS062E1 Microwave Oven

1 Answer

Power Surge - GE Microwave


see this steps and fix it. God bless you

  1. Controller is confusedA power surge or random non-reproducible action of the universe may have resulted in the controller's program ending up in an infinite loop. Pull the plug for a minute or two to reset it.
  2. Defective Interlock switchesThis can result in the controller thinking the door is open and ignoring you.
  3. CleaningCleaning solutions (spray cleaner) may have gotten inside and shorted out the touchpad or controller. If this happens remove the touchpad, let it air dry for a few days, and then attach it back on the microwave.

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Jul 12, 2013 | Microwave Ovens

1 Answer

Maytag microwave keypad


see this causes and fix it. God bless you
Touchpad and Control Panel If the microwave buttons don't work the touchpad and control panel assembly are probably defective.

Touchpad If the microwave buttons don't work the touchpad might be at fault. Generally speaking, if the display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad.

User Control and Display Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

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Oct 01, 2012 | Maytag MMV4205 Microwave Oven

1 Answer

It stopped working what to do to start it


1. The touchpad and external mouse drivers should be able to work together. Just make sure that you have the touchpad enabled. To see if you have the touchpad enabled, hold the Fn key and press F9. The combination Fn-F9 locks and unlocks the touchpad. If pressing Fn-F9 once, twice, thrice does not seem to lock/unlock your touchpad.. then you might not have the Toshiba hotkeys working or enabled. So lets forget it and try step 2. If Fn-F9 solved your problem.. there you go !

Arrow The way it works is you have to keep holding Fn key and have to hit F9 once, that should lock the touchpad. Again if you keep holding Fn and hit F9 again, that should unlock it and so on..

2. Sometimes this solves the problem.. Do a power cycle of your computer.. i.e., unplug the AC.. take the battery out.. Plug the AC back in and try to turn computer ON with AC alone (i.e, leave the battery out and just start computer with AC power).. Once windows loads up and everything is fine, then turn system off. Unplug AC.. put battery back in.. Plug AC back in and restart computer.. All should be working now.. if not, keep reading..

3. Click on START>go to RUN>type devmgmt.msc

4. Now in the Device Manager, click on the + sign next to Mice and other pointing devices. Right click on each device listed under "Mice and other pointing devices" and Uninstall ALL the MOUSE Devices you see listed there..

attention Make sure you ONLY uninstall the Mouse devices and not ALL devices from Device Manager like your CD, Display etc.. Just uninstall the devices listed under Mice and Other pointing devices after you have clicked on the + sign to the left of it..

5.Install Drivers

6. In the page that came up saying Downloads ( All operating systems, All categories ), at the top drop the list Filter by Operating System and select Windows XP (I am assuming you have XP.. if you have another OS, select that instead).. then on the right of it, drop the list Filter by Category and select Touchpad.. then click on the button "Apply Filters"..

7. Now you just see two drivers listed..

09-30-2004 Toshiba Utility
Touchpad Toshiba Touchpad Enable/Disable Utility for Windows XP (v1.27.0.3; 09-24-2004; 5.34M)

06-15-2004 Driver
Touchpad Alps Touchpad Driver for Windows XP/2000 (v6.0.303.5; 05-26-2004; 2.43M)

Click on the Download link on the right.. Save them to your computer somewhere in a folder or desktop, where you can remember.. After the files are downloaded, double-click on the file.. Unzip.. then Run.. and it will install the driver..

8. Restart your computer.. Now the Touchpad should be working fine.. Try Fn-F9 combination.. i.e, keep holding Fn key and tap F9 once, twice to see if it locks/unlocks the touchpad..

Jun 29, 2011 | Microwave Ovens

1 Answer

I have a Sharp model R-1610 Microwave. The work/night light does not work. I"ve changed the bulbs.


Does it operate with a membrane-type touchpad?

These things seem to be problematic as the microwave ages.

They are usually replaceable, and the cost is not great. I just installed a new touchpad on an LG, and it cost $25.00 plus shipping.

Oct 12, 2009 | Sharp R-1610 Microwave Oven

1 Answer

Ge microwave HVM1540DN1BB button control pad stopped working


I am not familiar with the Whirlpool microwaves; however, I just had the same problem with an LG over the range microwave. Several of the positions on the touchpad quit responding to touch. In our case, it was the touchpad itself that was the problem.

The touchpad on our microwave was held in place with adhesive. We pulled it off and replaced it with a new touchpad. Everything works now. The only complication is getting to the connector which carries the signals from the touchpad to the microwave controls. We had to remove and dissassemble the door to get to that connector.

The touchpad cost about $26.00.

Oct 09, 2009 | Whirlpool MH7140XF Microwave Oven

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