5045 not recording Timer record



I have a Liteon 5045 that will not record a TV channel Timer record properly as it once did. The system records as instructed but apparently on a channel other than what is specified in the Timer record and the recorded record is nothing but static. I think it is recording on a channel which has no transmision coming in on it.

This all started when we installed a digital TV cable box. How can I make the connection so that it once agains records on the correct channel? I have it installed the way the manual sugests-i.e., through the cable box, to the Liteon, then to the TV with the coax. Thanks for any help.