Pioneer CLD-79 Error Code

Hello, anyone have or know the error codes for this unit?

Here is the problem I'm having...

The unit powers on. Plays CD's, but not LD's. When I put in a LD, any disc, it pulls it in, loads it up, spins around all like normal, then stops and an error code of "P6" displays on the screen.

I popped open the case and checked to see what's going on, and it all looks good. The drive is engaging, the tray is ejecting and contracting, the disc mounts and spins.

Anyone? Anything? Thanks!