Digital tuner question

[Silversleep]

I do not have many digital tuners in my vintage stereo receiver collection as they are not my favorite. I do have a realistic sta 2200 that has a digital tuner on it and it makes a chirping sound and the stereo Beacon flashes at the same time of the chirps. The chirping sound appears to come from the tuning board obviously and I was just curious if anybody knows what causes that? Yes , I know it is a very strange situation. I know some of these receivers are half digital and half analog and not truly digital so I don't know if this one is either or. Certainly one of you guys that specializes in tuners has seen this before.

 

[NAD80]

Hello Silversleep. Found the Service Manual here.http://www.vintageshifi.com/repertoire-pdf/Realistic.php Wondering if any of the caps are going in the tuner or the power supply?

 

[39cross]

I have the STA-2200, mine makes a little chirping sound when I change stations. The noise sounds like it's coming out of the front end. What causes it. I don't know. It's one of the earliest digital tuners, so they were on the early part of the learning curve. That said, it's a pretty decent tuner. Wish I could tell you more, but at least you know it's not just your receiver that chirps.