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Put switch in 'on' position, remove the spark plug and connect it to the HT lead and earth out the side of the spark plug, pull over the engine to see if you are getting a spark. Check the timing gap between the ignition module and the flywheel. 0.25 filler guage
Could very well be the magnito (coil). You may also want to check the kill switch. If the switch failed in the off position... = no spark. Plug failure could also be the cause, although not likley. Good luck!
On the back of the power supply there is a 120/220 V AC selector switch.
It's possible that switch got knock on the wrong voltage position.
Pull the power cable.
Move the switch back and forth between the two position.
Make sure you leave the switch in the correct selection.
120v = USA
If you have time,open the case and inspect the RAM module(s) and card(s). They can be un-sitted.
plug in power cord and power on the pc.
safety switches that all riding mowers seem to have include a seat/brake safety which means that you have to be sitting in the seat or the brake must be engaged for it to start. also there is the blade engaged safety, which means the mower will not start normally with the blades engaged. if you meet those conditions check the switches themselves non safety related, do you hear a click or a clunk when you turn the key to the start position, this is the starting coil pulling in to send power from the battery to the engine starter, all safety switches will interupt power from the key switch to the starting coil if you hear the coil energize and the engine does not start you have low battery voltage or loose connection or some other mechanical problem
O.k. first ... Are you using an exterior plug?? Check and make sure you are getting power to the plug on the trimmer. If so, I would guess that it would be cheaper to replace the trimmer than to go to the manufacturer or a repair shop. If you like to tinker, go to Radio Shack and get a 20 amp rated switch and hardwire the darn thing. If you do something like this, ALWAYS SWITCH THE HOT (BLACK) WIRE!!! Never the white one.
Check the muffler for obstructions. Remove the muffler and check the exhaust port sometimes they are near plugged. If so remove all the crud with the cylinder in up position to prevent getting carbon in cylinder. Trimm to adjust Turn both L and H set screws clockwise until they bottom the back each one out 1 and 1/4 turn. This should allow you to start the trimmer. Then rev to max rpm and adj. the H screw to max rpm. Then set the idle with the L screw with good idle without string head turning. Then when throttled it should do so without hesitation. Once this is set you may have to fine trim the H screw for max rpm again.