[Elecraft] K2 Optical Encoder Test Problem

[sgbridge at comcast.net]

Just started the the alignment & test Part 1 on my K2 (Rev. f) page 42. Everything went well, no smoke or error codes, until I got to the Optical Encoder Test step2. It says to turn VFO knob in both directions and verify that displayed freq. changes accordingly. The only change I see is the right most digit, and it only changes from  7100.00 to 7100.01. Obviously not much movement. Have not seen this particular problem posted so I'm in the dark as to know how to fix it other than check my previous work. Any help would be appreciated.
Guy Bridge
N7BIR