Homebrew PCBs

> I cannot seem to locate the optical paper sensor.  Furthermore, is 
> the picture above where the sensor is located originally, or do I 
> need to move it there from some other location?

I am preparing to convert a C84 right now, which would be my third 
try at this.  I have already done a lexmark and an epson 220, which I 
believe is simular construction to the c84.

I cant tell you for certain on the C84, but on the 220 the paper 
sensor was hidden behind where the print-head camps out normally.  
There is some type of lever mechanism that flips over when paper is 
fed into the machine.  It was hidden on my epson as well and took me 
quite some time to find it.  Only after I managed to dismantle 
practically the entire top-rail, it showed itself.  Was tucked in and 
cliped on to the grey sheet metal with a small black plastic 
housing.  By that time the frame was giving me hell sticking itself 
together making it really difficult to plan out a lifting strategy.

BTW- There is also another sensor at the end of the paper feeding 
roller in the back, which must stay there in order for the machine to 
boot up correctly, not to confuse with the paper feed sensor.

Also, at times I got a little lost and thought I was taking off too 
much stuff, so I kept plugging it in to make sure it would boot up 
ok.  If I moved something or took something off I wasnt certain of, I 
plug it in to make sure it boots up; then if not - I knew I had to 
put that piece back on in order for the machine to work.  I had to 
abandon the 220 because the project reached a point where the printer 
no longer booted up and would not print, just with a blinking red 
light.