How do I rescue a DAT?

I have a DAT tape that is stuck in a Panasonic SV–3800 machine. At first, just wouldn't play audio, on this machine or on an SV-3700, but it did at least fast wind. Now the machine won't eject or play or do anything. I have tried powering it up several times. The literature I have seen online is insufficient, so far. I have had experience with ADATs in the past, where you could manually move a wheel inside to guide the tape out, but the wheels I see inside this machine won't budge. It is hard to tell if the tape is damaged, since you can't see it from the outside of the machine.