----- Original Message -----
From: "John Hudson" <[email protected]>
To: <[email protected]>; <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Thursday, December 01, 2011 12:14 PM
Subject: Re: [Drakelist] Baked Drakes
As we all know this has been a hot topic many times on the
list. One of my good friends worked at HP Fullerton
cleaning, repairing, and aligning test equipment. The
process was, as described prior, blowing out dust,
removing whose items that water would damage, using a
solution of simple green under pressure washer, scrubbing
with brush as needed, then rinsing with distilled water,
air hose, and baking at heat under 200 degrees for a week.
He said transformers were not a problem for this process.
It would be awesome to find photo's or documentation of
this process and placed in our document files.
We never had any documentation, just something handed
down. I worked for Neeley Sales Division which became the
Fullerton office later. We used dishwashing detergent but
Simple Green might work better. The transformers and chokes
we had trouble with were curiously enough the hermetically
sealed ones. That was because the sealing was often not
intact so that a little moisture could get in. It would be
very difficult to get it out again and it, or perhaps the
detergent, would cause arcing and loss of the device. Those
transformers and chokes were removed before cleaning. Open
frame units would dry out fine and were not a problem. We
removed meters and some plastic parts although the drying
oven was not hot enough to damage most plastic. A thorough
rinse is important as is blowing out the excess moisture
with filtered compressed air. Filtered because many air
compressors leave some oil residue in the air. Lubrication
when necessary was done to factory specs but I have
forgotten what was used, probably something gotten from -hp-
rather than locally. While I went to training classes at
Palo Alto and spent some time at the microwave division
factory I never visited the repair shop there so I don't
know what procedures they used.
We also painted cabinets when required. Note that
older cabinets were painted in whatever the current color
was so that you will find older instruments that originally
came with the dark gray cabinets painted in the almost
violet lighter gray or even blue.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
_______________________________________________
Drakelist mailing list
[email protected]
http://mailman.zerobeat.net/mailman/listinfo/drakelist
