I have two MDR513's w/ FW upgrades. Comcast Basic Cable (Pleasantville, NJ), no STB, cable > splitter > to each DVR and my Sony TV. The DVRs' comp outs go to TV.
Everything was fine until I re-scanned a few days ago with the Autochannel Preset Scan for analog/digital cable, thinking there might be new channels added. I discovered, later, with already programmed timer settings for ch 6.1 (Philly ABC) and !2.1, 12.2, & 12.3 (Philly PBS: WHYY, YArts, YInfo) it records black screen with "Scramble Program" [ScProg]. All other channels are fine. It doesn't record the "Scramble Program" banner, only a black screen.
Direct enter (not in timer setting, but live) these channels, it goes to "ScProg" showing DTV 12.1, 6.1, etc., any of the four affected.
Ch +/- rocker tunes (not in timer setting, but llive) regular 12.1, 6.1, etc. and will time record as long as machine is not turned off or it doesn't have to change to these channels while left turned on. If I tune this way (not timer rec) and turn the machine off; when I turn it back on, it will be on the "ScProg" station (instead of the one it was left on) which also displays DTV 12.1, 6.1, etc.
Ch +/- tunes several new 6.* Spanish language channels that I didn't have before, but does not tune a "ScProg" 6.1, and does not tune the 12.* "ScProg" channels.
I did several re-scans, soft reset, and the clean-tuner preset with no difference.
My TV gets these channels, as before, with no STB needed. Comcast will not help unless you use an STB which I don't need or want.
The Manual Preset box shows the main channel # and: ( _ _ _ ) but no way to enter anything within ( )'s.
Does anyone have a suggestion? The more I read through threads, the more confused I get.