I just have tried again.
RA: 144*4=576, a1=576*200*32=3686400,
DEC: 90*6=540, b1=540*200*32=3456000.
The gear ratio: RA=4 DEC=6
From Parked Position (DEC=90) to Mu UMa (41:30) gave my DEC reading of 56:00
The controller commanded 48:30 but the mount moved 34:00
From Mu UMa (41:30) to Jupiter (14:48) gave the DEC reading of 38:00
The controller commanded 41:30-14:48=26:42 but the mount moved 56-38=18
Now I pressed PARK to Home Position, DEC reads 90:00.
I entered right gear information (576:1 <- 144, 4 and 540:1 <- 90, 6), it still gives less movements than demands.
The ratio of 4 comes from 60/15, and 6 comes from 90/15.
Paul