Black & Decker CMM1200 charging doesn't happen

[leep]

Hi Guys; I've got a charging problem with this mower (CMM1200). It just doesn't want to charge.
This looks to be fairly typical of this unit. I cannot seem to find the fix though.
I suspect a fuse has blown or circuit breaker is knocked out but, how to find it?

 

[BlazNT]

No normally it is the charger itself. I do not know how to test them.