Hello People. I had to register with afterdawn to share mu findings with the world. here goes. When you remove the lens unit, turn it over and remove the metal case. Then you will find what I call the Lens unit Mobo. (see picture) There is a pot in the middle of it (see picture) My Viper GC didn't read a lot of brands 8 mm disk. My value was 380 ohms. I reduced it to 250 and I have had no problem since. (almost every brand 8mm Disk I tested Emtec/Sony/optodisc/Memorex work perfectly Burned @ 2 speed) I have "vipered 2 more GC's" and measured their Values I was supprised to see that their standard values were between 180 and 250 OHMS. So that's why I consider the Value optimized between 200 and 230.