Anyone encounter a 'dead' channel?
I took my DR-70d out for the first time this weekend. At a festival on Friday night I used 1&2 for a stereo pair (maiden voyage of the ADK TL's that I recently purchased from goodcooker) and recorded the same signal at -12dB on 3&4. That went fine, but when I press record for the first band on Saturday I've got nothing on channel 2. I switched all the mics and cables around to isolate the issue, and everything works fine on channels 1, 3, and 4. I ended up running the stereo pair on 3&4 and was able to record that at -12dB on 1&2, which leads me to believe there's no phantom power on 2. Why it worked Friday but failed 18 hours later is a mystery which warrants further investigation on my part. I just got home last night but figured I would post to see if someone else had seen this behavior with the deck.
Let's pump the brakes a second on a bad channel. The 70D has phantom power is enabled / disabled on a per-channel basis. While scrolling through the menus after your first recording, you could have accidentally disabled phantom power on Ch 2 or disarmed the channel for recording. All it would take is a quick press and slight turn of the Data knob, when you thought you were just scrolling down the menu.
Another possibility: If you had phantom enabled when you last powered down the unit, then next time you power on it will ask you to individually confirm phantom power for all of the channels that previously had it enabled. You could have accidentally selected Yes for Ch 1 and No for Ch 2. The buttons for the two choices are not near each other, but it could happen.
Something similar happened to me two weeks ago. Even though I have never once used it intentionally, I had somehow accidentally engaged a 120 Hz low cut on Channel 1. Of course, I had no idea until I exported the recording to my computer and listened. All it takes is a stray press or tweak of that Data knob...
So, what I would check:
1. BASIC > RECORD - Confirm both Ch 1 & Ch 2 set to ON.
2. BASIC > GAIN - Confirm both Ch 1 & Ch 2 set to the same gain range. (This obviously wouldn't cause nothing to be recorded, but it could make it sound nearly inaudible depending on what you were recording).
3. INPUT > INPUT GAIN - Confirm both Ch 1 & Ch 2 set to MIC+PHANTOM.
4. Make some test recordings.
Only after you have done all of that would I start to suspect a channel gone bad.