开云体育

I pass along the practice at Hewlett-Packard service centers. We washed pretty much everything. Equipment was first opened Moisture sensitive items, like panel meters and anything like paper, were removed. We did not blow out chassis with compressed air since that tends to just move dirt around and blow it into places where its hard to remove. Second step was to rinse the chassis with a garden hose and warm water. The blow out excessive moisture. Next step is to wash using liquid dishwashing detergent detergent in warm water using a paint sprayer. Along with the sprayed detergent the parts can be scrubbed off using paint brushes or soft dishwashing brushes. After washing the chassis is rinsed with warm water from the garden hose. Again blown off, get as much moisture off as possible. If you blow it off sufficiently there will not be deposits when it dries but a final rinse of distilled water will insure that.
The chassis was opened to insure access of water to all parts AND the ability of water to be removed and dried out.
Chassis were then baked in a very slow electric oven, around 130F, for at least 24 hours, longer if the oven was available, probably 48 hours is preferable. Once out of the oven other detail cleaning such as cleaning switches and other contacts was done and any relubrication was done.
We knew that a few transformers or chokes might be lost but that depended on the drying. A long drying cycle would prevent most of it. The most sensitive transformers and chokes were sealed units because the seals could let in a small amount of moisture which then had difficulty getting out again. Open frame transformers seldom failed.
FWIW, I washed perhaps several hundred instruments and never lost one. I understand that Tektronix used a very similar washing process.

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Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998