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I'm certainly one of the least experienced folks you could hear back from, but this looks like sun burn to me (although not as serious as many surviving plants in my collection!!). Also, the kind of orchid you have there, a phalenopsis, prefers lower light than many so logically it would become burnt most easily. I also don't see any sign of scale, and in my collection the phals are almost the only ones never to get scale... so I think you're safe (just move the plant to a less sunny spot)!! But wasn't Cynthia's lesson on scale useful!!! Glad you asked the question so that we all got so much information about treating scale!
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