dvd(not the cdr) calibration facts and (ohm ) data.

[adje]

I succesfully calibrated my cdr part of my ps 2 laser. Now i want to ajust my dvd part (potmeter),because my dvd 's do not boot up(not even real original dvd movies, only real ps 2 dvd). I got a pal v4 neo4 ps2 ,after holding the high tocfile real game,the laser ticks like aclock.After 14 secs the gold disc appears from the memory card on the screen. Then i put the dvdr in (who work fine at first, but since a week or two.......nada!!
THe memorycard screen is again visible for two seconds and then i get the message put in a playstation game or disc read error.
Does someone know what to do.