R-1481 start button won't work
I have a r-1482 model so I don't know how close they will be. The biggest issue I found so far with my particular model, yours my be the same, is the door safety micro switches fail primarily from opening the door while the unit is in the process of cooking which causes them to arc and burn the contacts resulting in premature failure. With an ohm meter, check the resistance of the contacts of each switch individually with the COM terminal lug temporarily removed and ensure the closed resistance is 0 ohms and infinity when the contacts are open. Measure from the COM terminal to the terminal in use either N.O. or N.C., with the switch button NOT depressed the N.O. will be open while the N.C. will be closed and with the button depressed they will be opposite, in other words N.O. will be closed and N.C. will be open. Another thing to check is that the door hooks aren't broken (they activate the safety switches. Should you remove the switch bracket to replace the micro switches, make sure you wire the switches exactly the way they were COM to COM, NC to NC & NO to NO, mount them in the bracket the exact way they were and adjust the bracket so that the switch buttons are just to the point of being fully depressed and no more when the door is fully closed. The micro switches may be different in model numbers but you can sub with a micro switch that has all three COM, NC, NO terminals and only use the terminals in use for the given switch. I used Omron p/n: D3V-16G-1C25-K from Mouser Electronics (800) 346-6873. Since you didn't indicate the control panel was not operational I won't go into that area. I can't say if the timer will count down or not if the micro switches are bad, but it's a possibility, further pointing to the switches. If the control panel or MW tube is bad it's my recommendation to buy a new oven, though you can get new MW tubes, diode & capacitor, it's not worth the shocking experience to the human body, not to mention the MW radiation.
Good luck if you still have the oven and decide to take it one step further.
Jul 19, 2012 |
Sharp R-1481B Microwave Oven