Microwave Sharp carousel model R-1440 appears to have had the child-proof lock feature accidentally activated--every time a button is touch on the face board, "lock" is displayed. As this unit is ~15 years old, the manual is long gone. Can you instruct as to overriding the "lock" feature?

Here is a section of the manual for your microwave on child lock, hope this helps.
"L" - Page 7 Press and hold STOP/CLEAR until " L " appears on the display and a BEEP sound is heard. The CHILD LOCK is now set. The time will disappear on the display . To cancel CHILD LOCK press and hold STOP/CLEAR until " L " disappears. You will hear a BEEP when it's released. If any button is pressed, "L" will appear on the display Your oven has a safety feature that prevents accidental running of the oven. Once the child lock is set, you will be unable to use any functions and no cooking can take place. However your child can still open the oven door. Press STOP/CLEAR. Child Lock 7

Does the display on your microwave read "Locked"? If so, then the Child Lock feature has been activated. To toggle the lock off, press and hold the Stop/Clear pad for more than 4 seconds. When this feature is active, most buttons are disabled to prevent accidental microwave use.

If holding the Stop/Clear button doesn't work, then I'd suggest there is a problem with the contacts behind the buttons. Sears Parts Direct has the parts diagrams for this microwave here: http://www.searspartsdirect.com/partsdirect/part-model/Goldstar-Parts/Microwave-Parts/Model-MV1604SB/1366/0123245 . (It's better to replace the control panel then to try to fix it.) Use the part numbers from the list to find price and availability at other sites.

The manual for the MV1604SB is available from Manage My Life: http://www.managemylife.com/mmh/owner_manuals/17638/GOLDSTAR-Countertop-Microwave-L0521424?brand_name_search=loosening+tight+screws .

I hope this helps.

Cindy Wells

On a friend's Samsung (she didn't tell me her model number either), you lock the keypad by pressing "0" and then "2". Press the same sequence to unlock the pad. Maybe this will work on her model.

Got you covered. Here you go:

Microwave - Explanation of the Child Lock Out Feature
Many microwave control panels can be locked to prevent accidental use or access by children.
There are two different ways to lock the control panel:
1. Press and hold the CLEAR/OFF pad for 3 seconds. The display will show "LOCK" and then revert to the time of day.
A small "L" will appear in the corner of the display as a reminder that the control panel is locked. If anyone tries to use the microwave, the display will show "LOCK".
2. On some models, press and hold the 5 and 7 pads simultaneously for 3 seconds.
To unlock the control: Repeat the procedure which was used to lock the control. (Press and hold the CLEAR/OFF pad for about 3 seconds or hold the 5 and 7 pad simultaneously for 3 seconds.)
Microwave - Explanation of the Child Lock Out Feature

Many microwave control panels can be locked to prevent accidental use or access by children.

There are two different ways to lock the control panel:

1. Press and hold the CLEAR/OFF pad for 3 seconds. The display will show "LOCK" and then revert to the time of day.
A small "L" will appear in the corner of the display as a reminder that the control panel is locked. If anyone tries to use the microwave, the display will show "LOCK".


2. On some models, press and hold the 5 and 7 pads simultaneously for 3 seconds.


To unlock the control: Repeat the procedure which was used to lock the control. (Press and hold the CLEAR/OFF pad for about 3 seconds or hold the 5 and 7 pad simultaneously for 3 seconds.)
That info is from GE

Hope that does the trick.
Regards, Farmerbear at FixYa.com






























Microwave - Explanation of the Child Lock Out Feature

Many microwave control panels can be locked to prevent accidental use or access by children.

There are two different ways to lock the control panel:

1. Press and hold the CLEAR/OFF pad for 3 seconds. The display will show "LOCK" and then revert to the time of day.
A small "L" will appear in the corner of the display as a reminder that the control panel is locked. If anyone tries to use the microwave, the display will show "LOCK".


2. On some models, press and hold the 5 and 7 pads simultaneously for 3 seconds.


To unlock the control: Repeat the procedure which was used to lock the control. (Press and hold the CLEAR/OFF pad for about 3 seconds or hold the 5 and 7 pad simultaneously for 3 seconds.)
Microwave - Explanation of the Child Lock Out Feature

Many microwave control panels can be locked to prevent accidental use or access by children.

There are two different ways to lock the control panel:

1. Press and hold the CLEAR/OFF pad for 3 seconds. The display will show "LOCK" and then revert to the time of day.
A small "L" will appear in the corner of the display as a reminder that the control panel is locked. If anyone tries to use the microwave, the display will show "LOCK".


2. On some models, press and hold the 5 and 7 pads simultaneously for 3 seconds.


To unlock the control: Repeat the procedure which was used to lock the control. (Press and hold the CLEAR/OFF pad for about 3 seconds or hold the 5 and 7 pad simultaneously for 3 seconds.)

The Child Lock is on.

Your owner's manual covers it. If for some reason you don't have yours, you can download it free here.

CHILD LOCK
You may lock the control panel to prevent the microwave from being accidentally started or used by children.

Example: To set the child lock.
1. Touch STOP/CLEAR.
2. Touch and hold START more than 4 seconds. LOCKED will appear in the display window with two beeps.

Example: To cancel the child lock.
1. Touch and hold START more than 4 seconds. LOCKED will disappear and you hear two beeps. At this time the oven is ready.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Take it immediately to a local Microwave repair shop...looks like one of the circuits may have gone...otherwise switch off from mains

try pressing 'stop' button for 3 seconds

The Sharp Microwave/Convection oven I have says to touch the Custom Help button, the number "1", then touch the Start Button. To turn off the child lock, press the Stop button.
Or just unplug it, wait 1 minute, and plug in.

Usually you access that feature via the "Custom Help" pad in newer models.

If that doesn't work, please reply back with your model number so we can help you.

We're happy to help you and we'd appreciate your thoughtful rating of our answer.

On the R1490-series, you press Custom Help > "1" > Stop/Clear to turn the child lock off.

This may work for you, or press Custom Help and look for a lock option.

If your model does not have a Custom Help button, please reply back with your exact model.

We're happy to help and we appreciate your thoughtful rating of our answer.