|Originally posted by J_Nemeth:
I think it has to do with if you had set the timer to record a show, but the tape ran out and rewound before the timer hit its out-mark. For example, you have 60 min. of tape left and you set the timer to start at 9:58pm and end at 11:00pm. The timer wants to record 62 min. of material, but the tape can't make it and runs out. TU DST50 thinks it hasn't finished recording, so goes into record when you stick in another tape.
This is consistent with my experience with both the 50 and the 51. Furthermore, clearing the timer afterward is not always sufficient to prevent unwanted recording.
After an STB-programmed recording that fails to complete (because the tape runs out, or because you hit STOP before the end of the programmed interval), the STB will not return to a "safe" state until at least one other timer recording has been programmed and completed. Otherwise, if there is a recordable tape in the machine, and the STB is powered up, recording begins immediately.
So if I want to use a unit for playback after it's been used for an interrupted recording, I find that I have to program a short recording (even 1 minute should do) and let it complete before proceeeding.
This is enough of a nuisance that I'm usually very careful not to program more time than the tape can hold. I've found that all the tapes I use (Fuji ST-120s, Maxell ST-126BQs, ST-160s, and DF-300s, and JVC DF-300s and DF-420s) will reliably hold 3 minutes more material than the nominal tape length, so that's what I usually program.