Just to revisit a possible 515 OS software issue I detected and posted here about 5-6 weeks ago... I have BOTH of my 515s set to Manual Clock Set ON, and am using the digital Fox Network channel. The unit goes on at 11:59am and 11:59pm, looks for the time signal, and seems to keep absolutely perfect time. Both units' clocks are exactly in sync with my Scientific Atlanta STB clocks.
However, every 7-10 days (approximately), I hear one of the 515's HDD fan running while the unit is off. Sure enough, every single time this happens, the OTHER 515's fan is also running. Powering up each unit for ~30 seconds, and then turning it off, solves the immediate problem, as the fan shuts down.
My theory is that there is some sort of glitch in the 515s OS, and when the designated time set channel is somehow "offline" (no video signal? channel cannot be detected? time signal missing?), the 515 fails to complete the time setting procedure and, although the unit's power remains off, the fan remains on.
It's not a big deal, as I usually catch it within a few hours and shut off both fans, but the fact that it consistently happens with both units simultaneously makes me think that the units are mishandling a time setting signal glitch. Maybe Funai techs could be made aware of this, although it would probably be pretty damn hard to duplicate in a lab.
Again, a good option would be to set Manual Clock Set to OFF, and just reset the clock manually, as needed. Although using the Fox digital channel for time sync seems to work perfectly about 95% of the time. This whole thing may also be another customer affliction from that benificent cable provider, Blight House....