I recently purchased an 1981 M20K that has an onboard weather radar system.  The system is an RCA 1001 display head with the antena in the right wing.  The head will light up and appear to work but it won't even paint the ground so I have no hope that it will paint weather.  The place where I bought the aircraft did not charge extra for having it installed (since it didn't work) but I'm wondering if anyone else has this system and if it might be brought back to life? Thank you for any suggesti