How to maintain JDL- 18-BTK2 computer calendar without display?

The computer calendar is not displayed mainly for the following reasons:

First, the transformer is broken: at this time, the perpetual calendar movement can't be electrified, so it can't display the time;

Second, the circuit board of the perpetual calendar movement is broken, and there are many reasons for the damage. At this time, you'd better put on a new digital perpetual calendar movement;

Third, replace a memory battery again to see what effect it has;