Homebrew PCBs

I got most of the mechanicals out of the way now and decided to put 
it back together where I can to check to see if it will work still.  
I got everything wired back up and power it up.  It seems to do fine 
for a while - you hear it doing it's usual cleaning - the main 
feeder shaft seems to rotate the right direction etc.

However, when it finishes that up, The "Paper" LED blinks and both 
inks show as being empty.  I don't have this printer connected to a 
computer at the moment so that could be partially the problem - not 
sure either way.

There is one thing I have to remove and this too could be the 
problem.  The paper feeder has an opto sensor on it to detect the 
position of a shaft (the one that holds the cams to feed the paper 
in).  This sensor is NOT the paper "leading edge" sensor.  I have 
tried to manual rotate that shaft so the sensor can "see" through 
the hole and so that it is blocked - same errors either way.

Anyone have any suggestions - I am all ears .

Thanks

Chris