a schematic is not going to be enough
you are going to need the service manual (including the EPS section)
since you replaced the EPS board it will have to be setup.
It is integrated into the drive system along with the steering and it needs to be setup correctly before it will work correctly.
There should be a dip switch module that enables and disables certain functions and modes and also a couple of trim pots across the top of the board? those need to be verified and set correctly as well.
Do not trust the card out of the box expecting it to be set right... it probably isn't.

until you get it setup right the truck will not run right or at all.
until you purchase a manual for this truck you will be spinning your wheels and getting nowhere and could possibly blow out the board again. And until you resolve the 'fuse blowing' problem i would not attempt to try and run the truck for very long because it could cause more damage.

good luck