Im very suprised at this. ASC appointment notices are sent out within 30 days after you file your application. If you do not receive it..
CALL USCIS!!!!!!!
This is why we are here guys! We can notify the office INSTANTLY that you have not received your notice and have it sent out within 45 days after you call. This is fact. We are here to help you guys, I work personally for USCIS and help 60+ people a day, the call center has over 500 people (English Center) who most likely take 40-60 calls per day depending on shift.
Thousands of Service Requests for this type of thing are sent out every day. All you have to do is call. If you wait 6 months for your fingerprint notice, I'm surprised your case has not been denied yet due to abandonment. Come on guys. Call the number in my sig please. I do not want to see anyone lose money due to something like this.