Hello, I have a Panasonic ST-DT100 9 years old.
It suddenly stopped playing discs (DVD and CD).
After research on forums, it was suggested the spindle motor that spins the disc.
I opened the player up, and tried to give the disc a push to kick start the motor. but this did not work.
So I moved to plan B. I removed to innard sections to get at the motor itself.
See guide...
http://www.elektr0n.com/dwm/doku.php?id=how_to_fix_the_h07_ho7_error_on_your_panasonic_dvd_player
The above guide helped me take apart the inside section of the player. the guide is not for a ST-DT100, but Panasonic's are all the same on the inside.
Once I could get at the spindle motor, I put a small amount of WD40 on it. Then plugged it in and gave it a push whilst powered up.
It started to spin!
So I put it all back together, and I have my DVD player back and operational again.
So don't chuck your player just because you see this error, get some screwdrivers out.
Maxwell Tsu-Araujo
December 2011