Our Sentex gate entry system died and I troubleshot it to a dead power supply. The Sentex service tech wanted $65.00 trip charge and $60.00 every half hour plus parts!! WOW... I ordered the parts for $47.00 total (Tax and Shipping inc.), got them the next day and it is 100% again..
Saved a few hundred dollars too.. Highly recommend you take the time to use this site for your repairs..