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Date: | Fri, 26 Apr 96 11:38:29 PST |
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Although I've not made any type of scientific study on
cleaning of reflectors, I've been using Isopropyl Alcohol for
years with no obvious problems.
This is a case where an ounce of prevention is worth a pound
of cure. Try to keep the inside of the printer as clean as
possible. Don't introduce any unfiltered air. Obviously, the
less you clean reflectors the better. Gently wiping with a soft
cloth dampened with alcohol should suffice. With non-collimated
exposure units (flood type reflectors) you would have to really
scratch or dent the reflector to cause any noticeable problems.
A collimated reflector is much more susceptible to damage, and
even a small scratch can be reproduced on the panel.
You might try vacuuming the reflectors with a cleanroom type
vacuum using a soft bristle attachment. Check with your
equipment supplier; they may have some specific recommendations
Mark Dowding
Multek, Inc
Irvine CA
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Subject: FAB: CLEANING EXPOSURE UNIT REFLECTORS
Author: [log in to unmask] at INTERNET_GATEWAY
Date: 4/26/96 9:06 AM
Has anyone made a study on how to clean the UV exposure unit's reflectors
in particular on non-collimated + soldermask exposure machines ?
What to do / not do, frequency of cleaning, pros and cons..
- From what we can see, some people are using alcohol iso to clean, but
is it a good solution ? Won't it remove natural protection and enhance
oxydation ?
- Isn't it more suitable to polish, if so with which product ?
We are very concerned because exposure time for Probimer 52 is rather
long (over 120 seconds) on two BASF 60/75 (Probimer 330) and PEPR 2400
(ED Resist) on a PC-130 and a BASF 60/75 using Gallium lamps.
Thank you in advance
Regards, Roland
Roland Jaquet Technical Director
Henri Jaquet SA PCB manufacturer
Geneva Switzerland Prototypes and small qties
tel. xx41-22-794-7878 fx. xx41-22-794-3052
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