STERN Star Trek LE I noticed that my flipper started to flutter When you lock a ball our would get a metal , shots were the shaker was supposed to engage . I went into test coil test mode and tested the shaker motor. It would work and after a few start button presses to activate the test I saw and heard the shaker motor hum and the weights would not move . I would need to manually flip one of the weights with my hand and it would spin. But it will work 80% of the time and then the shaker motor will just hum and cause weird issues like some of the flashers will flick on. I have to flip the weight with my hand and it will spin. It is very intermittent . I believe the shaker board is OK as I am getting power the motor as I can hear it hum trying to spin. Is there any advise as to why the motor Hum's and will not always spin the weights ? Is the motor starting to fail ? Can it be cleaned with contact cleaner or lubed with oil some way. My board and shaker came installed from the factory # 520-6803-00 . Marco has this number as a replacement for the 520-5065-00 that are in my XMEN and Avengers . Any one had this intermittent issue . HELP if you can. Thank you so much . Rob
http://www.marcospecialties.com/pinball-parts/520-6803-00

Thanks for quick response LTG but I do not understand what a bad field is . Could you explain what you mean. Does the motor need to be replaced ?

Thank you for taking the time to speak with me on the telephone and explaining in length what my issue is. Very nice man !!!