No key's work. Display and inside light is working

Try turning it off at the power switch,leave off for several seconds then switch it back on, it may reset the control unit, if not take it to a repair outlet,

Considering the problems you are having it would be cheaper to replace the microwave oven.

It is the control panel. You can actually just replace the circuit board on the control panel and it should fix this.

Here are lock / unlock schemes for three recent Sanyo models:

- Press and hold Stop/Cancel for 3 seconds
- Press and hold Stop/Reset for 3 seconds or so
- Press Stop/Clear five times

Hopefully one of those will work.

If none of these work for you, contact Sanyo Service Customer Service.

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You can download your owner's manual free here.

From the manual:

SETTING THE CLOCK - When the microwave oven is plugged into an outlet, the oven will display " 0:00 "

1. Press the CLOCK button; the hour digit will blink
and the clock indicator will light.

2. Press the number keys to set current hour.

3. Press the number keys to set current minute.

4. Press AM/PM to choose AM or PM.

5. Press the CLOCK button again; the display will
show the present time. After the clock has been
set, the time will appear with blinking colon,
unless the oven is cooking or defrosting.

NOTES:

- To reset the present time in the display window when the oven is off, press the CLOCK button and
reset.

- If you make a mistake when setting the time, press the STOP/CLEAR button.

- To recall the actual time while the oven is cooking or defrosting, simply press the CLOCK button
and the display will show the actual time for three seconds.

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If your keys do not work at all, you probably have a bad keypad, in which case I'd ask you to reply back. In the meantime:

SETTING THE CLOCK

When the microwave oven is plugged into an outlet,
the oven will display " 0:00 "

1. Press the CLOCK button; the hour digit will blink
and the clock indicator will light.

2. Press the number keys to set current hour.

3. Press the number keys to set current minute.

4. Press AM/PM to choose AM or PM.

5. Press the CLOCK button again; the display will
show the present time. After the clock has been set,
the time will appear with blinking colon, unless
the oven is cooking or defrosting.

You can actually download your owner's manual here

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

Sounds like the ERC board failed. It maybe covered under warranty, check that first cause a new ERC could cost around $150-$200. Anything electric can cause the .."what the*^&% just happened syndrome.

Is it possible someone may have sprayed cleaner directly onto the keypad area?

This causes moisture to get into the keypad and sometimes onto the control board.

This could mean that they control panel frame with keypad (membrane switch) would need to be replaced.

Can you give more details on the cleaning?

It sounds like your controller may be failing. Or it could be an electrical line problem. Any other electrical itmes giving you trouble? Has anyone measured the voltage level of your power line? It should be around 110-125 volts AC. If it's significantly lower or higher, you may have a bad connection in your breaker panel or in the wiring leading to the home.