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Originally Posted by Steve McD 
I've determined that the failure of my DCH-3416 to do timed programs is due to one of the tuners not working. Apparently, one of the tuners is always used for the first timed program that is set and the other is always used for a manual recording. The non-working tuner is the one designated for the first timed program, so that's why that feature didn't function, although manual recording is possible.

I've determined that the failure of my DCH-3416 to do timed programs is due to one of the tuners not working. Apparently, one of the tuners is always used for the first timed program that is set and the other is always used for a manual recording. The non-working tuner is the one designated for the first timed program, so that's why that feature didn't function, although manual recording is possible.
Unless you DCH3416 is quite defective regarding this curious tuner symptom you describe, I didn't think that's how the two tuners worked.
I thought both tuners were theoretically equal in purpose and function, although I believe that the built-in internal splitter directing the single connected coax to the two internal tuners is slightly stronger on one tuner side than the other.
This can be demonstrated by going into the hardware diagnostics menus (from power-ON state, press power-OFF and then OK), navigating to d04 (inband status) to reveal the two tuners and their state. The difference in SNR between the two can be 1-2db or so, with tuner 1 getting "more signal strength" from the splitter, hence having a generally better SNR.
But aside from that, I believe both tuners are functionally identical in terms of recording, either automatically or manually set, either one-off or series shows. No conceptual difference.
I also believe that it is always the "background tuner" (i.e. the other one, that is not being used "in the foreground" to actually deliver content to the video outputs for you to watch) which is always considered "available" and is first selected for use when starting a timer-recording. The idea is to leave the "foreground tuner" untouched if possible for the current viewer to watch live TV.
Only if two programs are scheduled for recording at the same time do both tuners come into play. And if you're currently watching on that "foreground tuner" (i.e. if the DVR is powered on, the assumption is that the "foreground tuner" is being watched) when that second simultaneous program needs the second "foreground tuner" and if the channel to be recorded is other than what is currently selected (and that you're presumably currently watching) is a message flashed asking if you want to allow the DVR to change channels to start recording, or to keep the DVR on the current channel for you to continue watching using the "foreground tuner" and to flush the scheduled recording.
Once the "foreground tuner" starts recording, you see "REC" on the front display panel. Otherwise, it will show the time-of-day or current channel, indicating that it is NOT in use recording. The "background tuner" has the red recording light indicator turned on when it is in use.
Incidentally, with an early generation DVR (progably DCT6412) I used to have a signal strength problem (remember the small difference between the SNR on the two tuners, because of the internal splitter) where one of my channels (turned out to be KCBS-DT here in LA) was "right on the margins". When assigned to the "stronger" tuner, KCBS-DT would record fine. When assigned to the "weaker" tuner, KCBS-DT would record with many digital artifacts. Oddly, this did not seem to affect watching KCBS-DT live, only on recordings. I know, this lacks the ring of truth... but I never observed the artifacts when watching the very same show live (e.g. "CSI: Original") which would record almost unwatchable.
The solution I came up with (which worked!) was to SWAP the tuners, so that tuner #2 (the weaker tuner) was in the foreground and tuner #1 (the stronger tuner) was in the background. Then, when KCBS-DT recordings were going to be recorded, and the "background tuner" got preference, my "CSI: Original" recordings would be fine.
Ok. Now, I do also recall that some time back I had some issue involving availability of the two tuners for recording (or rather, unavailability of both tuners for recording). Seemed that only one tuner was being used, and it was always the "foreground tuner", never the "background tuner".
I knew this was happening because while I was watching live I would always get the popup message about channel-change when any recording would come due for activation. And if I let it change channels and start recording, the REC would appear on the display panel indicating that the "foreground tuner" was now being used for recording.
This was clearly wrong, as nothing was using the "background tuner" and it should have been selected first. And yet, that wasn't happening.
Well, I must have had an absolutely brand new tuner that had NEVER been used before (i.e. I was its very first user). And it turns out what I needed to do was push the SWAP button on the remote, to reverse background and foreground tuners. Apparently, the initially "background tuner" had never been "activated", if you can call it that! It simply wasn't available for use as the second tuner!
But once I flipped them with the SWAP button, now BOTH tuners were truly "activated" and available for normal use. And now timer recording behavior was as I described above, namely "normal"... with the first timer recording always selecting the "background tuner" (with the red recording light going on). The "foreground tuner" was always avoided unless two simultaneous recordings are set, in which case the REC lights up immediately (if the DVR is currently OFF, i.e. "sleeping", or if the DVR is currently ON that you are already tuned to the same channel of the second scheduled recording) or the "channel change" popup message appears if needed.
So, if the above dual-tuner behavior is not what happens with your DCH3416 (which is being swapped for a new DCX3400), have you at least tried using the SWAP button on the remote? I know, it sounds like you're already using both tuners to do recordings (although with limitations)... but have you actually just done a SWAP, to reverse tuners #1 and #2 from background to foreground and vice versa?
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Is there a code and procedure for returning the remote to its factory default, to remove the altered button functions I've installed?
The method described in the reply just above this one seems to describe what you're looking for.
But you can also return individual keys, one at a time, to their original default.
Restore a Remapped Key:
The following technique can be used to restore the original function to a key that has been remapped. You are essentially mapping the key onto itself.
1. Press the device key ("Cable", "TV", or "AUX") for the device you want.
2. Press and hold the "Setup" key until the selected device button blinks twice.
3. Type in the code 994. The selected device key will blink twice.
4. Press the key you are restoring twice. The device key will blink twice if successful.





















Actually the "Down Arrow" does at least 3 different things; arrows down in menus/guides, goes to Live TV & is the stop button if you're watching a show.

