Thanks Bev, I understand the concern. For everyone else's sake we are
making one of the college interns do the hands on work in a completely
separate room. (kidding).It is a modern ballast in a customer's existing
assy.
Lenny Carter
Design Engineer
ERG, Inc.
ph (607) 754-9187 x3063
www.ergpower.com
----- Original Message -----
From: "Bev Christian" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, May 29, 2009 4:19 PM
Subject: Re: [TN] lighting ballast encapsulant removal
Lenny,
How OLD is this thing?! Some fluorescent light ballasts from the 1980s
and earlier had PCBs in them and I ain't talkin' printed circuit boards
here!
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Terry L. Munson
Sent: Friday, May 29, 2009 4:11 PM
To: [log in to unmask]
Subject: Re: [TN] lighting ballast encapsulant removal
Lenny
I would suggest a different non-chemical approach by freezing the
ballast
and then chipping or cutting the frozen pitch material to get to the
surface
for Failure Analysis. We have found that pitch can be contaminated and
cause leakage and corrosion problems. We have also found that
capacitors can
leak and the electrolyte will dissolve the material and cause leakage
and
corrosion problems. If you have solder joint problems then this
approach
works well to investigate the joint quality as well. If you have an
question
please call.
Terry Munson
765-457-8095
In a message dated 5/29/2009 2:01:42 P.M. Eastern Daylight Time,
[log in to unmask] writes:
We have a lighting ballast in for failure analysis and arent sure how
to
get the encapsulant "tar" from it?
This is a lighting ballast and we have the metal covers removed and are
left with a ballast assy built on a pcb, and covered in a thick,
black,
semi-pliable, tar-like encapsulant.
The tar-like encapsualant smells just like roofing tar. If you lay it
on
a piece of notepaper it stains it just like roofing tar. It can be
peeled
away just like a roofing tar. We are afraid of poking too much and
damaging components or circuits. Anybody have experience with it? - and
know
what it is? and how to let it soak in a pan of something and rinse
this stuff
of instead? Better ideas?
Thanks in advance,
Lenny Carter
Design Engineer
ERG, Inc.
ph (607) 754-9187 x3063
www.ergpower.com
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