Post by thread:PCBs /w transparencies

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

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 <spam_OUTpn30TakeThisOuTCOLUMBIA.EDU> > To: .....PICLISTKILLspam@spam@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

On Wed, 10 Sep 1997 17:00:19 -0700, you wrote: >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 > Try using Drafting Film instead of HP Transparencies - it works like a charm for me on both my LJIIID and DJ600 8-) -- Andy B. http://www.abtec.demon.co.uk SBN Level 2 Member --------------------------------------------------------- "How can I tell that the past isn't a fiction designed to account for the discrepancy between my immediate physical senstaions and my state of mind....." ------------------------------------------- Douglas Adams