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If the dot shot from the bottom left corner is not
found on the tape, it means the optical path is very
much misaligned. Please try the mid-left spot instead
of the bottom-left corner. Make sure the dots of the
top-left and the middle-left overlaps, then go back to
the original top-left and bottom-left adjustment.
The screws behind the first mirror control the
mirror angle which is shown in the picture below.
Release the nut on the screw, rotate the screw for the
desired direction and test the dot location until the
two dots overlaps. Tighten the nut slightly back to its
position after the adjustment is done.
First Mirror Dot Direction