The reference spin down successful time is 40-60s (not absolutely). If spin down fails, there will be a prompt to tell you how to deal with it, you can also refer to the following steps.
Spin down time ≥60S means the belt is too loose, please tighten the belt; spin down time ≤40S means the belt is too tight, please loose the belt. Below are the belt adjust steps for your reference.
First, use a 2mm Allen key to remove the two fixing screws, remove the access cover.
Then use 8mm open end wrench to adjust belt tension, turn clockwise to tighten the belt, turn counterclockwise to loosen the belt. When adjusting, turn ¼ counterclockwise or clockwise according to the tips of calibration results, then make calibration again to check the result.