Mth Proto 3 upgrade: Smoke Unit Heats, but no fan.

The cut seems fine as long as there's no bridging over the cut.

Since the fan is connected totally separate from the PCB anyway, it shouldn't be affected by the cut.  Does the fan motor run on 1.5 volts DC?

Did you get the correct FLASH load beep codes when you loaded the chain files?

are u sure that you cut the board traces completely ! your solder looks blobbed on n not smooth. It' s very import the resister heater elements are no longer  in parallel other wise the resistance will be incorrect. i can not verify your trace cut because u have a metal bracket on top of board! the resister heating element must be in series! Alan

@Alan Mancus posted:

 It' s very import the resister heater elements are no longer  in parallel other wise the resistance will be incorrect.

That's incorrect, the mod to the smoke unit is to put the two 16 ohm resistors in parallel!  The resistance to the PS/3 board should be 8 ohms.  That matches the PS2/PS3 smoke units.  In any case, since it's not the heater that's the issue, but rather the fan, I don't think that's the issue.

The fan motor works on straight DC. I did try to reload the diesel smoke flash, but got no "morse code" acknowledgement. I did that about 5 times. I also reversed the motor leads, which did nothing. What voltage reading should I get with a multimeter when the probes are placed on those leads? I will report my findings when the engine is in front of me again. Thanks for your help.

If the flash loader doesn't detect a change in the code (it's already there), it doesn't give you the code acknowledgement.  The motor should run regardless of which way the wires are connected, but it should run clockwise for proper operation.