Cause: I found the cause and solution. Dust and debris settle in the up and down roller more so than the side to side roller because of the angle and gravity.
Solution: You need to take apart the plastic housing and then dismantle the circuit board to get in and remove dust/debris from the up and down roller area. You will need a magnifying glass and small flash light to really inspect the area. I took a sewing needle and carefully removed all the debris on both sides of this roller. I then blew the area clean with my mouth. You should actually use a compressed air spray from an electronics store. After removing all the debris and air spraying it clean then assemble back to normal the circuit board and housing. Bingo! This solved the problem which is not an electronic problem but a mechanical one.
Answers & Comments
Cause:
I found the cause and solution. Dust and debris settle in the up and down roller more so than the side to side roller because of the angle and gravity.
Solution:
You need to take apart the plastic housing and then dismantle the circuit board to get in and remove dust/debris from the up and down roller area. You will need a magnifying glass and small flash light to really inspect the area. I took a sewing needle and carefully removed all the debris on both sides of this roller. I then blew the area clean with my mouth. You should actually use a compressed air spray from an electronics store. After removing all the debris and air spraying it clean then assemble back to normal the circuit board and housing. Bingo! This solved the problem which is not an electronic problem but a mechanical one.
It's been 9 years, and this post still helped someone out. Thanks