On Friday, December 22, 2017 at 1:46:45 PM UTC-5, wrote:

How do I identify these pots and how do I determine which one(s) to
turn?
Eric

https://www.repairfaq.org/sam/cdfaq.htm

https://www.repairfaq.org/sam/k38n.gif

is one of many for Sanyo. But, once you are in there and identify the exact part number, google that.

Typically clockwise is "More" and counter-clockwise is "Less". As with many things, lasers dim with age.

Note that there is also a distance/focus adjust.

Peter Wieck
Melrose Park, PA