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Problem:


1. When you push it in (calibration position), value indication on led display remain on.
2. In this position any of the constant values (for example FAST 2.0), still affect the reference frequency.
3. Also when you push and keep it full in, the “8.8” diagnostic led display no lit. It go off.


Solution in my case:


1. I replace both U110 and U115. Those are two logic ic's, 74LS00 and 74LS02.
2. After that you need to readjust the “variable timing center control” R145, to center the range.


I hope this help someone with the same problem.