Electronics4you
Member
Hi there,
After 10 years of making PCB's using my old trustworthy UV exposure unit, I decided to make a new one with tubes on both sides to avoid flipping the PCB when making a double sided one (yes, I know it was a bit old school).
I have tried different exposure times, but the final results come out all blurry. Nothing else but the exposure unit has changed, so clearly something is going on here. The toner of the film is placed against the bare PCB to avoid light from the sides and reflective film in the bottom of the unit creates a uniform light exposure.
Have anyone seen this issue before with blurry PCBs and what the causes may be? Could it be other things such as bad photoresist, over-/underexposure etc.?
Thanks
After 10 years of making PCB's using my old trustworthy UV exposure unit, I decided to make a new one with tubes on both sides to avoid flipping the PCB when making a double sided one (yes, I know it was a bit old school).
I have tried different exposure times, but the final results come out all blurry. Nothing else but the exposure unit has changed, so clearly something is going on here. The toner of the film is placed against the bare PCB to avoid light from the sides and reflective film in the bottom of the unit creates a uniform light exposure.
Have anyone seen this issue before with blurry PCBs and what the causes may be? Could it be other things such as bad photoresist, over-/underexposure etc.?
Thanks