Microsoft Xbox Repair Manual page 56

Touch points 1 and 3 with the probes, you use red or black with either it makes no difference. Get
an initial reading, it should be over 1400 and not fluctuate.
Scrape away the epoxy on the screw, not always an easy task and probably the most likely chance
to irreparably damage your DVD. The epoxy sticks well and you need to pick at it hard to get it
off, I use an X-Acto knife. Attempt to slice across the top of the screw until you expose silver
across the surface then use a pick to remove the epoxy in the center of the screw.
(While removing this check to see that the contacts are not also covered with epoxy, this happens
from time to time and makes it impossible to get a reading)
Now adjust this screw counterclockwise until it reads a lower number (suggest 100 unit
increments). A little goes a long way in adjusting this screw. After each change completely re-
assemble and test the drive. Repeat until the drive starts working or you reach 800. If it still does
not work at 800 get a new drive .
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