Yep, the connectors to the controller board are of the sort that guarantees some fun after a few disconnect/connect cycles.
About schematics ... you don't need one, since it is both the male and female DSUB15 connector put in between.
So you're totally free to choose your own scheme. But if you like to copy mine ... here you go:
sensor wires ... on pin 3 / pin 13
heater cartridge ... on pin 6+7 / pin 9+10
NC ... pin 8
stepper motor red / green / black / blue ... on pin 5 / pin 4 / pin 15 / pin 14
fan 1 ... on pin 2 / pin 12
fan 2 ... on pin 1 / pin 11
I thought it were safer to use two pins each for the heater current; one may as well reserve the redundant pins 7+9 for the laser head.
Also note that I placed a washer between each DSUB connector and the Trinus' sheetmetal parts (see picture) to allow full contact.
The DSUB connectors fit so tightly now that I am tempted to omit the two M4 screws hat fix the print head