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[iNFAMOUS]

This guide will show you how to POT Tweak

Your Hitachi, BenQ, Samsung, or LiteOn Xbox 360

DVD Drive POT Tweak

This tutorial is for those of you which have dirty disc errors, discs sometimes working
and sometimes not. Etc .. I hope you get the point.
Remember to test your disc on another modded box before you recalibrate the pot to
make sure your disc is a good working copy in the first place?

Ok lets start.
Get your Xbox 360 opened up (I’m assuming you know how to do this considering you want to adjust the pot.)
Take the metal casing off the dvd drive by removing the 4 screws holding it in place.
Now turn it over and you should see the following…



You need to push the black tab on the bottom right to one side, this  lets you lift up the pcb. Do this VERY slowly as it will only lift up a  little. One you have lifted it a tiny bit you can remove the cable which  is holding the pcb In place, one you have removed this you should lift  the pcb over and left it there.
(remember to be gentle at all times,  this cables are hard to come by if you damage them)



Now you should see the picture above. Remove the cable connecting the  pcb to the lens so you have more room to calibrate the pot. Now look at  the pic below.



To measure the pot, get a multimeter, and also a micro electronic screwdriver with a 2MM tip (flat head).



Now get your multimeter and set it to 20K (ohms). Connect it to the two  connections on the pot. (doesn’t matter about positive and negative, any  way round will do) and take the reading.The reading for the DVD pot is  around 3.4k ohms > 4.2k ohms. Once you have taken this reading, write  it down somewhere safe just in case you want to put it back to the  original setting. Now its time to calibrate the pot and reduce the resistance (increase the power of the laser) and hopefully eliminate those dirty disc errors and “open tray”  problems. I would recommend reducing the pot by upto 100 ohms at a time,  keep trying until your discs read, DONT REDUCE THE POT TO LESS THAN 2.8K  as you will risk burning out your laser. Using your screw driver,  rotate the pot clockwise a fraction at a time , remember a FRACTION at a  time, and read the pot again, like I said, keep reading the pot with  the multimeter and reduce it by 100ohms or so each time until you find a  good setting. Ive found that around 3.0k > 3.4k ohms works ok.
But  feel free to experiment (be sensible)

- DVD-ROM Pot is always circled in red.

-  Hitachi/Samsung laser pots are accessed from the bottom of the drive,   you will have to remove the circuit board to tweak these.

-Lite-On/Ben-Q laser Pots are accessed from the top of the drive, Ejecting the tray before tweaking will make this easier.

-All Drives dvd pots are located on the left in the pictures, and will be the same when you are physically looking at them.

-  Take note to what way i instruct to turn the pot to decrease the   resistance value of the pot. it differs between Lite-On/Ben-Q and   Hitachi/Samsung




Now put your console back together and hope for the best,
If all goes well your open tray problems will be fixed!