I have been looking very extensively both here and on the WWW
regards the PCB interface unit, cat. no.: 150-N which I have
on each of my four SMC-2 units.
I have tried looking everywhere 
The electronic board has no source for input voltage etc, with the
exception of a ten pin connection labelled "TP1" near the DIP
switches. I suspect this 10 pin set to be a serial interface to a PC
for I/O communication purposes. It may also be a source of voltage
to actuate the gate on each of the three modules.
There is the typical trigger connections for the TT162N powerblocks
attached to the heatsink (four wires for each module), but there is
no voltage source for them to work...well none that I can see.
See the attached photo to help you.
I have seen the documents:
150-at002_-en-p.pdf
150-in001_-mu-p.pdf
150-in004_-mu-p.pdf
150-in006_-mu-p.pdf
150-qs002_-en-p.pdf
150-um003_-en-p.pdf
...none provide any wiring diagrams for the SMC-2 with an attached
150-N interface unit.
What I really would love to see is a schematic for the legacy board
150-N, pinout wiring diagram for the ten pins located near the
DIP switch and how to provide power to the three powerblock gates
while still using the 150-N PCB interface.
Any help related to the 150-N interface board would be of great
assistance.
My interest in these units can be explained
by visiting Homegrown Power
...and that is me, CraziestOzzy 
Cheers
