I had trouble with making PCBs with my HP640 inkjet and HP transparencies as well. I used a fine point ink pen to clean them up. I'll try premium paper mode. Ken ---------- > From: Pierce Nichols > To: PICLIST@MITVMA.MIT.EDU > Subject: PCBs /w transparencies > Date: Wednesday, September 10, 1997 7:49 AM > > On Wed, 10 Sep 1997, WF AUTOMA=?iso-8859-1?Q?=C7=C3O ?= wrote: > > > > BTW have you tried to make a layout mask using transparency, ink jet > > > printer and photoresist, is the quality and contrast acceptable? > > > I have tried using laser printer, but have found that the black areas were > > > slightly transparent to UV, so the resulting pcb was practicaly unusable. > > You had a problem with a laser printed transparency? We use that > technique to make boards in the lab I work at, and it works like a charm. > We use an Apple laser printer (don't remember the model off hand), and we > have had no problems with spotting or pinholes. > > Pierce Nichols