Yeloc2 -
I had a similar problem on my MarkIV less than a month after we acquired it. I called the dealer who suggested the following:
1. Turn off the DKV.
2. Unplug the DKV.
3. Wait five minutes.
4. Plug it in again. You should hear the DKV in "reboot" mode after you plug it in.
5. Once the DKV is fully "on" again, try playing a song.
This worked for us, and we've had no problems since (bearing in mind we only acquired the DKV on May 31).
According to our dealer over 90% of the issues with the MarkIV can be solved by this "unplug and restart" procedure. If this doesn't work, I'd suggest you call your dealer.
Mike
From: disklavier@yahoogroups.com
To: disklavier@yahoogroups.com
Sent: Sat Jul 12 10:04:49 2008
Subject: [disklavier] Disklavier mk4 lost acoustic playback
my 6 month old mk4 no longer will play back midi or any other songs
except on quiet mode. these are the same songs that I have played for
months that are piano songs and now when you push acoustic, it just
goes quiet. any suggestions thanks twilloo1@alltel.net